Archive of Our Own ^beta

Chapter Text

Shinsou was an omega. He was entirely unaware of this fact until the sports festival. After his only slightly humiliating feat at the hands of Izuku Midorya, he'd gone to lick his wounds and get fussed over by Recovery Girl. Everyone who was in the third phase was either backstage in the prep rooms or watching from their classes spectating area, and he was surrounded by class 1-A. It felt almost like a personal taunt. His loss stung, his hands and knees stung from where he’d hit the concrete, and his nose stung- wait. What?

Something smelled weird. Like someone was running a popcorn machine and churning out kettle corn- but also burning it?
Sweet caramel sugar, but with a distinct undercurrent of something smokier, more flammable. “Uh, did I hit my head at all?” Shinsou asked Recovery Girl, who’d just given him a slightly wrinkly peck on the cheek and closed over his scrapes.

“No, dear. What’s wrong? Feeling dizzy?”

“Oh, uh. No. Just smelling things. Do you smell caramel corn?”

“Fraid not, dear. But if you’re feeling lightheaded, I really recommend you lie back and rest a bit more. Sometimes healing takes a lot out of even you youngsters.”

“No, no, I’m fine, just-“ the smell increased, and he felt a tug deep in his gut. It smelled so good, it made his mouth water. What on earth was making that smell?
He found himself leaving the temporary infirmary without truly meaning to- he blinked and suddenly he was out in a hallway, getting closer to a set of ready rooms. “Fuck off! I meant to go in your room, shitty Half n Half, haven’t you ever heard of an intimidation tactic?” That was all the warning he got before the hurricane of blonde hair and red fire that was /someone/ stormed past him, knocking against his shoulder roughly.

Shinsou opened his mouth to protest and was hit in the face with a triple dose of that burnt sugar-spun caramel. “Wa-“ the person didn’t stop or turn back and the last thing Shinsou saw as his knees gave out and the pull in his gut turned into an all-consuming storm was the back of a blonde head.

Shinsou woke up with a mouth full of cotton and a body that was… unpleasantly sticky. He tried to sit up, and immediately became aware that he was hopelessly entangled in a mess of sheets and blankets, and that he was in a room entirely unfamiliar to him. This wasn’t his room at the foster house, at the shelter, or even the temporary infirmary at the sports festival- the sports festival! 

He shoved the blankets off of him to the best of his ability and winced at the soreness between his legs. Something felt distinctly off. Where was he? What happened?
A buzzer sounded and the door- painted white like the rest of the room- opened partially from a hatch. A bundle of familiar clothes was pushed through the square-foot opening, followed by a package of what looked like food, and a piece of paper.

Shinsou extracted himself from the mess of blankets and crawled over to the new additions to the room. The clothes were his, washed and free of any smells or stains. The food was a simple wrap that he immediately scarfed down as his hunger made itself known. The note, however, was much more interesting.

Hello Shinsou,

You were brought here after falling into heat during the sports festival. We’ve contacted your current guardians and they’ll be notified when you’ve come out and it’s time to pick you up. Recovery Girl said you were unpresented and assigned beta until now, so I imagine this was a surprise. Everything’s been taken care of and arranged by UA, so just focus on getting your strength back. I’ll come find you when you’re back at school to discuss some things.
Aizawa Shouta.

Shinsou almost dropped the piece of paper in surprise. Heat? Presented? Aizawa? As in, /the/ Aizawa? Eraserhead? Homeroom teacher of the /hero/ course’s class 1-A? Wanted to talk to him? 

Shinsou became aware of several things at once. Memories started to come back to him- hazy memories of heat-addled panic, throwing himself against someone restraining him- Vlad king? Biting at anyone who tried to get too close. And then Midnight putting him to sleep. Hours upon hours of furiously masturbating, trying to soothe the burning heat and ache deep inside him that his fingers couldn’t reach. New anatomical developments. And he lost the sports festival. But Aizawa wanted to talk to him?

As the last of his heat subsided, Shinsou cleaned himself up in the sterile bathroom. Dried slick covered almost every inch of his body and he felt distinctly less disgusting when he put his own clothes back on. True to Aizawa’s letter, his foster family was called and when the door to his heat room unlocked, Hana was waiting to drive him home. She handed him a packet wordlessly- suppressants. He had to take them now, of course. Her eyes were soft, full of quiet sympathy. He didn’t hate seeing it as much as he thought he would.

“You did well in the festival.” She said, eyes on the road as they drove home.“I lost.”

“You made it to the finals. That’s more than the rest of your classmates did, or even half the hero courses.” He made a dismissive sound at the back of his throat. “You got a mention in the paper, and they played some of your fight on the news. For a kid that didn’t get any formal training, you made it farther than anyone would have expected. /And/ you presented right afterwards. Have a little mercy on yourself.”

He didn’t respond, and neither did she, for a moment. “Any idea what triggered it? A lot of kids present at this time in their lives, but there’s usually signs long before that happens. I checked your room- sorry, but the heat house and UA wanted paperwork that I keep in that room. I know you didn’t have a nest or anything.”
“No idea.” Caramel, creme brulee. A freshly blown-out candle.

“Well. You can let me know if something comes up. I know this was a surprise, but.” She sighed, glancing at him. He continued to give her a blank stare. “Just know you can talk to me. I know you’ve only lived with us for just over a year and you’re used to moving around a lot and you’ve had some shitty experiences, but I hope you can trust me at least a little bit if something’s bothering you.” Shinsou gave a tiny jerk of a nod.

Shinsou returned to UA the next day- he’d missed a whole week of classes and the prospect of catching up to the rest of his classmates was daunting. The note in his pocket- the one from Aizawa- was burning a hole through his clothes as he debated about what to do about it. Was he supposed to find Aizawa himself? Go to the teachers lounge?

It turned out to be a non-starter, partway through his English class the 1-A homeroom teacher pulled him out of class.
“Aizawa-sensei.” Shinsou bowed low. He looked up to the underground hero, the only other student to be successfully transferred from the general course to the hero studies course.

“Follow me.” The exhausted-looking instructor, still with an arm in a cast, led him to a conference room.

“Ah! Shinsou.” Shinsou jumped slightly at the high-pitched voice calling his name. This was particularly notable as the voice belonged to the one and only rat-weasel-person-thing that was UA’s principle. “Come in, come in, have some tea!”

Shinsou found himself seated in a comfortable chair, a cup of tea in his hand, and staring down the principal and both hero-course teachers who sat across a table from him. He opened his mouth to say something and no words came out.

“You’re probably wondering what’s going on.” Aizawa-sensei said in a drawl. “It’s a fact that any student who does sufficiently well in the sports festival can earn themself a place in the hero course. It’s also a fact that this has happened once in the past fifty years. It’s not an easy thing to do. It’s also a fact that the entrance exam for the hero course is overly biased in favouring students with quirks that manifest themselves in vast displays of physical power and force. Following?”
“I- I think so?” His voice cracked. His heart was beating fast in his chest.

“I’m famous in this school for expelling students in my course that I feel have no future as students. I am not famous for giving people I don’t think have the right attitude or the right mindset or the right set of powers to become a hero a chance in my class.”

“What Aizawa-san is trying to say, Shinsou-“ Nezu interrupted calmly. “-is that we were impressed by the capabilities you showed during the sports festival and are considering moving you up to the hero course as soon as there is room for you.”

“There’s room.” Aizawa said, eyes darkening. “I’ve filled out the paperwork to move one of my students down to general studies with a heavy caution to his new teachers that he should be monitored closely. He’s displayed inappropriate behaviour and attitudes towards his female classmates and I do not have a place for him in my hero course.”

“Ah, yes. Mineta Minoru. I saw that you filed that request this morning, when you heard young Shinsou here had returned. I suppose that settles it then.”

“I- I’m sorry, settles what?” Shinsou couldn’t quite believe what was happening- could he trust his own eyes? His own ears?

“Why, settles that you’ll be transferred into class 1-A, of course.” Nezu grinned. “I assume you’re still interested in being a hero?”

And that’s how Shinsou ended up in the hero course.

And that’s how Shinsou ended up being at the training camp.

And that’s how Shinsou ended up watching, too far away to do anything but watch, as Katsuki Bakugou was sucked through the portal and kidnapped by villains.

Shinsou and Bakugou had talked a few times since he’d joined the hero course. Shinsou was the only person in the room who’d consistently respond to Bakugou’s yelling and taunts and curses with pure unadulterated sarcasm and eyerolls. It seemed to have earned him a measure of respect from the explosive blonde. When Shinsou had been sitting alone at a table in the cafeteria one day, a few of Bakugou’s friends had joined his table. He guessed there wasn’t enough empty space at any of the other tables so they had to sit near him. He fully expected to be ignored, so when sunny Mina and Kaminari had intentionally roped him in to a discussion about their latest hero training session he was entirely unprepared.

Bakugou had joined the table a few minutes later and begrudgingly joined in the conversation. And the next day, the group sat at his table again. And again. 

It felt almost alarmingly easy to talk to them- perhaps because they didn’t seem to either ignore him nor force him to participate more than he wanted to. There was an easy balance there. If he wanted to say something, he could. No dirty looks, no hesitant responses. If he didn’t want to talk, he didn’t have to. They wouldn’t push it.

He didn’t make the connection between Bakugou and the dark caramel smell that had sent him into heat. The memory was hazy, the blonde hair and angry voice almost entirely wiped from his memory by the fever of heat. So when Bakugou was kidnapped, it shocked him how much it affected him.

He sat in the hospital numbly, listening to Kirishima plot and plan and preach. He’d gotten enough of the gas and a nasty head wound that he was bed-bound, and so he wasn’t entirely surprised when he wasn’t invited to be part of the squad to rescue Bakugou. His quirk wouldn’t do anything to help them. It wasn’t physical enough, wasn’t powerful enough. What could he have done?

Bakugou was rescued, Aizawa and All Might came to talk to his foster mom. He moved in to the dorms. When the class was scolded by Aizawa for not speaking up about his classmate’s plan to rescue Bakugou themselves, he was excluded from the scolding due to the gas he inhaled and his concussion. After all, he’d done nothing but watch. The group of students hadn’t needed his help. Nobody had needed him.

Except, it turns out, someone did need him. Two nights after moving in to the dorms, there was a rough pounding on his door that yanked him out of sleep in the of the night. A glance at his alarm clock said it was 3am. Not an unreasonable hour, but not the hour that he’d expected to have someone knocking at his door.
He also didn’t expect to see a ragged-looking Bakugou on the other side of the door. He opened his mouth to speak, but it was cut off.

“Use your quirk on me.”

“I’m sorry, what?”

“Please. Use your quirk on me. I can’t sleep.”

Wordlessly, Shinsou opened the door and let Bakugou into his room.

“Bakugou. What’s going on?”

“Thought I just fuckin told you. I can’t sleep and I want you to use your quirk on me to put me the fuck out.”

“What? No, dude. I’m not gonna use my quirk to knock you out.” Shinsou’s brain was buzzing as he took in the exhausted, bedraggled Bakugou in his room. He’d never seen him look so /defeated/. “Go see Recovery Girl or something.”

“No!” The response was much more emphatic than their previous hushed arguing and Shinsou jumped. “Fuck. No.” He repeated, quieter this time. “She’ll send me back to the hospital and I would rather stay awake until I pass out before I went back there. Or I’ll have to spend the night in the infirmary and. Just. Please. Put me under with your quirk. Order me to not have dreams or something.”

“I don’t know if it works that way, Bakugou. And I don’t know if I’m allowed to use my quirk on you-“

“God damnit, do you want me to beg? I’ll beg, Shinsou, I’ll get on my damn knees and prostrate myself if it means that I can have a shot at some sleep that doesn’t come with dreams or doctors or-“

Shinsou bit his tongue, hard. “O… okay. I’ll do it.”

“Oh for the love of- oh. You said yes.”

“Yes. But you can’t tell anyone.”

“Wasn’t planning on it.” Bakugou visibly slumped with relief. “Ok. Fuck, ok. Yeah, just, like, tell me to go to sleep or something and uh. If you can order me to not have any dreams? That’d be real fuckin' peachy.”

“Have you slept at all since-“

“Not really, nah. Sometimes I doze off without realizing and then I’m back there in the bar or with that horrible black goo coming out of my mouth and-“ he trailed off.

Shinsou didn’t say anything, but watched as Bakugou ran his hands through his hair. Blonde hair. “So do I just… lie down?”

“Down here? In my bed?” Shinsou’s eyebrows shot up into his hairline.

“Well, I figured, uh, in case something went wrong- and I really. Uh. Fuck. I’m sorry. I don’t want to be alone right now. And I figure you’re the only other one besides Kirishima that wouldn’t blab about something like this.”

Shinsou softened. Maybe it was a mistake- a big, fat, terrible mistake, but Bakugou looked wretched, wretched enough to come to him for help and say things like ‘please’. And that vulnerability wasn’t something Shinsou couldn’t relate to. He’d had nights where the last thing on earth he wanted was to be alone. “Ok. We’ll share. Just, uh, try and get close to the wall.” His futon was big enough for them both, probably?

Bakugou looked oddly small- way smaller than Shinsou had ever seen the alpha- as he rolled over and tried to get as close to the edge as possible. “Wake me up if I start having a nightmare. Please.”

“Of course. Now close your eyes.” Bakugou did as instructed. “You good?”

“Yeah-“

“//Sleep//.”

It was almost eerie how quickly and thoroughly the order went through him. Tension Shinsou didn’t even know Bakugou had been holding on to ebbed out as his limbs relaxed. His eyebrows un-furrowed, his face went lax. His lips parted just ever so slightly. “//Sleep deeply, with no dreams, till sunrise//.” Shinsou ordered with a whisper, hoping it would work. He held the control for a few minutes, watching Bakugou sleep. He let it drop, finally, and breathed a sigh of relief when Bakugou did not wake.
What should he do now? Just… crawl into bed? Should he grab the blanket?

After a moment’s hesitation, Shinsou pulled the blanket up over Bakugou, and slid back in to his bed. He nudged Bakugou by accident and froze- Bakugou kept on sleeping. That peaceful expression looked odd on him. Not bad odd, just… odd.

Shinsou curled up on the edge of the bed, leaving a solid foot of space between him and Bakugou, and hoped that it would be enough. He wished, not for the first time, that he could order himself to sleep. But alas, he had to wait until his nerves calmed and sleep claimed him once more.

Shinsou woke up /hot/. Not heat hot, thank god, but way warmer than he was used to. He also woke up constricted. And there was someone breathing in his ear- oh god.
Memories of the 3am conversation and its results came back to him and Shinsou sucked in a breath. Bakugou, still fast asleep by some miracle or curse, was currently clinging to him for dear life and had his face pressed into his neck.

Right by a certain set of glands. And that set of glands was currently pumping out his lavender and petrichor scent like its life depended on it. He must have forgotten to slap on a new scent patch when Bakugou came over. His cheeks darkened and he bit back a muffled curse.

Bakugou stirred slightly, and the arms wrapped around his waist tightened. /Oh fuck/.

Shinsou spent a solid ten minutes staring at his desk, trying to parse out what on earth to do about this situation. If he woke Bakugou up would he get his face exploded? He cringed imagining the look on Bakugou’s face when he opened his eyes to find himself fucking /spooning/ Shinsou.

He settled for the least explosive strategy- slowly and painstakingly peeling one of Bakugou’s arms away from his chest so he’d be free enough to hopefully slip out of his grasp and maybe, like, flee the scene or something. Inch by inch, finger by finger, Shinsou started to work himself out of Bakugou’s grip. When Bakugou’s head was dislodged from its place shoved into his neck, a soft whine echoed from his throat and the fingers Shinsou was trying to pry off clenched back down again. Shinsou froze, but Bakugou still seemed asleep.

What he /didn’t/ sleep through was Shinsou accidentally elbowing him in the pec as he finally got his arm free, but by then it was too late. Shinsou had grabbed his towel and got a single glimpse of a sleepy alpha sitting up in bed and looking around blearily as he high-tailed it out of his room and took a very, very long shower. When he emerged, fingers pruning, his room was empty and the bed was made. He let out a sigh of relief.

Bakugou avoided his gaze all day, barely saying a few words to him. He thought at one point they’d made eye contact, but no- Bakugou was clearly staring out the window instead. If his cheeks seemed oddly pink that was just the lighting.

Shinsou didn’t let it bother him too much. It wasn’t unprecedented that someone was keeping their distance after he brainwashed them- even if he’d asked for it. So he went about his day, ate lunch outside by himself, and went straight back to his room after class. He collapsed into his bed, exhausted, and froze when he caught a whiff of spun sugar. 

There! On his pillow. The one by the wall. The one /Bakugou/ had been sleeping on.

Fully aware that he looked like a creep, he buried his face in the pillow and took a big whiff. Memory hit him over the head like a ton of explosive bricks.

The sports festival. The smell. An angry blonde.

“FUCK!” Shinsou cursed out loud, throwing the pillow across the room. He immediately regretted it, nose curling. “God fucking damnit, of course it’s him.” He groaned, pressing the palms of his hands into his eyes. “Of course he’s the goddamn alpha with that stupid fucking scent that made me present- for fucks sake. Can I get a singular moment of peace in this godforsaken existence?” He sighed, thudding his head back against the un-scented pillow. Bakugou’s scent patches must have come loose during the night.

What should he do? Did Bakugou even know that he’d been the one that sent him into the throes of heat so fast he literally passed out? Did he even remember that- or notice it in the first place?

Shinsou wasn’t sure why he cared so much- sure, Bakugou smelled fucking amazing, sure he was everything an omega would want in an alpha- but Shinsou didn’t give a rats ass about secondary genders. All being an omega had done for him was cause him to miss a week of class and forced him to take a pill every day to avoid having to miss any more weeks.

And sure, whenever he’d gotten a whiff of the scents of the other alphas in class- Deku’s mown grass, Shouji’s leather-in-sun, Jirou’s chocolate and coffee, to name a few- none of them had had half the appeal of Bakugou’s. 

And then, of course, it was the fact that it was Bakugou’s scent that triggered him presenting in the first place. Dug deep into what was a thoroughly normal beta existence and yanked the omega out of him. Shinsou glared at his sheets, his normal bed, the pillow he’d flung across the room. His skin was crawling, his sheets felt harsh and stiff against his skin. 

Shinsou groaned. He wanted to make a nest, didn’t he. That’s what all this nonsense was about. Smelling Bakugou in his bed had once again dragged suppressed instincts out into light. “Fucking Bakugou.” He grunted, opening the box of sheets and blankets he kept under his bed. His foster mom had insisted he take them with him, saying something that even though he didn’t have a nest at her house, he should take some just in case. Now he was begrudgingly thankful for her insistence.

The itching under his skin eased up slowly as he carefully arranged his extra blankets by the foot of his bed. He didn’t take over his futon- he refused to cave completely and turn his bed into a full-blown nest. He would need to go buy more pillows if this was going to become a thing- possibly a floor cushion. But hopefully he’d get it out of his system and take it down the next day. And hopefully nobody saw it.

He knew some of his classmates knew he was an omega. Maybe all of them did. He wore scent patches and he didn’t give off alpha vibes, per se. And he knew Todoroki at the very least had seen him collapsed when he’d presented. That didn’t bother him that much- he knew either way there was not a damn thing he could do about it. What he could do something about was make sure that nobody saw him building a freaking nest in his dorm room.

Shinsou sat back, staring at the mound of blankets. It looked like a mess, like someone had thrown a pile of laundry down on the floor, but at the same time, if he moved something even a little it immediately felt off. Shinsou begrudgingly placed the pillow- the one with Bakugou’s scent on it- in the centre of the nest.
He felt tired, suddenly, exhaustion pulling at his very core. Driven more by instinct than sense, he found himself curled up in the nest with heavy eyelids and soon was dead to the world.

Bakugou came to his door again that night. Shinsou let him in, not saying a word, and watched as the tired alpha sank into his futon. He froze, though, glancing towards the foot of his bed. Shinsou silently groaned.

“’s that your nest?” Bakugou asked. Shinsou could have sworn that even in the low light of his room there was a flush to Bakugou’s cheeks.

“What’s it to you?”

“Nothing. Just wondering why it’s on the floor. Looks stupidly uncomfortable.”

“Didn’t want to mess up my bed.”

“Well that’s stupid, what else is the point of it? If ya sleep in there you’re gonna get a crook in your neck. Gonna hurt.”

“How do you know what the point of a nest is, you’re an alpha.”

“Tch, because I’m not an idiot.” Ok, he was definitely blushing. Was Shinsou blushing too? No, because that would be dumb. “I know things.”

“It’s my nest and I’ll put it where I damn well please. If you aren’t here to sleep then fucking leave or whatever.”

“No, I just- fuck. Ok.” Bakugou shuffled his way over to the far side of the futon, movements stiff and ears red. “Sorry. Didn’t mean to… criticize your nest. Or something.”

“It’s whatever. Did you have any dreams last night?”

“No. I… I slept really well. Thanks.” Bakugou avoided his eyes. Shinsou sighed, pulling the blankets over him as he slipped in bed next to him. “I… I’m sorry.”

“About what?”

“Y’know. Holding you and shit. During the night. Didn’t mean to.”

“It’s fine. It wasn’t… it wasn’t awful.”

“Really?” The question came out at just above a whisper. “Oh. Ok. That’s… that’s good.”

“Goodnight, Bakugou.”

“Goodni-“

“//Sleep//.”

Chapter Text

Shinsou woke up with Bakugou clinging to him again. He didn’t bother with trying to sneak out that time. If Bakugou was fine with accidental midnight spooning then he wasn’t going to protest. It felt good. Shinsou hated how good it felt.

If he focused, he could get a hint of Bakugou’s smokey sweet scent. Bakugou, he could only assume, was having a grand old time nosing around his scent glands in his sleep. The explosive blonde was once again happily buried in the crook of Shinsou’s neck and the very tired omega was doing his very best to ignore the little sparks that the occasional movement sent down his spine that emanated from that particular contact. Of course Bakugou would stick his big fat angry nose in an erogenous zone. Why not.

Shinsou felt that tug again. The need to wrap himself- or rather, both of them- in blankets and pillows so they were so comfortable they’d never even dream of leaving the space he’d made for them. And while the concept of an eternal nap sounded lovely, he decisively squashed down that little urge in favour of /gently/ elbowing Bakugou in the ribs.

“mmfuck, five more minutes.” The blonde groaned, clinging even tighter.

“No. Wake up. I need to piss.”

“Then go piss, f’ fucks sake."

“I can’t. You’re doing it again.” Shinsou patted Bakugou on one beefy forearm. Man, quirk training did him well.

“‘M doing what again- oh.” Bakugou was quite abruptly awake, eyes wide open and arms snapping back to his sides like they were magnetized. In a moment he was rolled over as far to the wall as he could get, yanking the blanket with him.

A whine escaped Shinsou’s throat before he could stop himself at the rush of chilled air. “Fuck you, it’s cold!”

“Fuck off, you’re the one who put all the blankets on the floor!”

“Fuck you, that’s my nest!”

“Fuck you!”

Shinsou grunted and reached for the door, sleepily shuffling out into the hall. Blinking sleep from his eyes, he tried his best not to think about how not awful waking up in someone’s arms had been. And it was just that it was someone. Not because it was Bakugou. Obviously.

“Oh hey Shinsou.” Ejirou Kirishima greeted him at the bathroom sinks. “Have you seen Bakugou? I tried knocking on the wall last night but I guess he’s a deep sleeper. He left his textbook in my room a couple nights ago.”

“Ah no, sorry, I haven’t.” Shinsou thanked his lucky stars that his deadpan stare was so effortless to maintain at this point in his life. “Probably best to bring it to class and trade it there.”

“Sure thing, my man.”

After reliving himself, Shinsou was surprised to see Bakugou still in his room, sitting upright in bed and staring at a corner that just so happened to also have that dumb nest.

“I shouldn’t have criticized it.” He said without looking up. “It’s not my business.”

“It’s whatever. It’s pretty shitty.” Shinsou shrugged.

“Nah, it’s not that bad. Weird that it’s on the floor though.”

“I wouldn’t know. It’s uh… it’s my first one. So I kinda just put it where I had space.”

“Most people put it on the bed- wait, what? It’s your first one?”

“That’s what I just said.”

“But what about, y’know, the past few years? I thought you omegas did that shit for ages.” Oh, so he did know Shinsou was an omega. That’s fine.

“I thought I was a beta until the sports festival.” Shinsou could practically see the gears turning in Bakugou’s head.

“What? Really?”

“Yeah. I spent the rest of the week in a damn heat house because it hit so hard I pretty much went feral.”

“Wait- that was your first heat? You were in heat at the sports fest?” Bakugou’s face contorted in a mess of confusion, then he looked abruptly thunderstruck.

“What?” Shinsou made a face in response.

“Ah, nothing, just remembered I have to go grab something-“ Bakugou scrambled to his feet, almost falling off the futon and making a dash for the door.

“Kirishima’s bringing your textbook to class.” Shinsou said, but he was already gone. “What the fuck.” Shinsou said to the open air, flopping back onto the bed. His nest stared at him. “I’ll deal with you later.” He told the pile of inanimate fabric.

Bakugou knocked on his door that night. Shinsou, expecting it, opened it up. “We can do it in your room, I think it’s safe to say that you’ll be fine during the night even if you’re under the quirk.” He wasn’t expecting the slight droop in Bakugou’s usual partial-sneer, the flash of something in his eyes. “Just figure it would be more room for you.”

“Oh. Okay. Sure.” And so Bakugou led Shinsou back to his room. It was dark, dark enough that Shinsou couldn’t see much more than what the light from the hallway illuminated. He did see a certain All Might poster that he was pretty sure Izuku had told him was limited edition. He heard, rather than saw, Bakugou slide into his bed.

“Ready?”

“Sure.” The reply was terse, but it was enough.

“//Sleep//.“

Shinsou jolted awake into pitch-blackness. “Fucking hell what was- oh.” A soft knock on the door clued him in to what had woken him up.

“Who’s there- oh. Bakugou.”

“Didn’t work.” The blonde grunted, already moving to push past Shinsou into his room. Shinsou didn’t budge.

“I’m sorry, what?”

“It didn’t work. I had dreams.”

“It should have worked just fine, it’s what I did the past two nights- what are you doing?” He watched as Bakugou tried to shove past him into his room.

“Why can’t it be in here? Don’t want me in your nest?” Shinsou turned bright red- he’d pulled some of the nest on the floor onto the futon as a compromise that very night.

“That’s fuckin’ fine, whatever. I’ll sleep on the floor.”

“What? That’s a terrible idea. You’ll end up with a backache and then you’ll be even grumpier than usual tomorrow.” Shinsou reluctantly let Bakugou into the room, trying to ignore how the alpha seemed to automatically size up the nest. /He’s not looking at your nest. He doesn’t care about it, why would he care what size or shape or how good it is even if you are an omega and he is an alpha?/

“I don’t care. I just need to sleep and I can’t do that with these fucking dreams that wake me up-“

“I don’t understand, though.” Shinsou said, already making room for Bakugou on the futon. “I did everything exactly the same. You should not have woken up tonight since you didn’t the first two nights. It doesn’t make sense.”

Bakugou mumbled something under his breath, standing in his room with his hands shoved in his pockets.

“I mean honestly, if you’re sleeping on the floor I highly doubt it would make a difference if you were in my room or yours or the freaking common room- it shouldn’t matter.”

Bakugou seemed to deflate, running a hand through wayward blonde spikes. “I… I don’t think its your quirk. Or it’s not all your quirk.” He admitted, sounding almost pained.

“What? What else could it be?”“Y’know. Your scent.”

“My- my /scent/?”

“Yeah, fuck, it’s your scent. It relaxes me or some shit. Keeps me from having shitty dreams.” Bakugou was avoiding making eye contact, even in the almost-blackness. “But. Whatever I guess. I can go back to my room.” He turned, already reaching for the door.

“Don’t.” Shinsou spoke before he could even think, and Bakugou froze. “Don’t go. If that’s what’s keeping you from having nightmares, then… whatever. It’s whatever. But don’t try to sleep on the floor. That’s just stupid.” Shinsou moved over, patting the futon beside him. His heart hammered in his chest and with the partial embrace of the wall of his nest soothing him, he finally felt like he was starting to understand its merits.

Bakugou hesitated at the edge, not touching the shallow boundary of the nest. Shinsou rolled his eyes. “Fucking… just come on. Come in.” And so Bakugou did, all but melting into the mess of blankets and pillows.

“Thank you.” It was almost too quiet to hear.

“It’s whatever. You too… I mean. You smell nice too.”

“How do you know what I smell like?”

“Sports fest. I guess Uraraka managed to rip your patch off.”

“Oh.”

“Yeah.”

“Shinsou-“

“Go to sleep, Bakugou.”

“Ok.”

It wasn’t until the next day that Shinsou realized he hadn’t used his quirk on Bakugou. He decided, in what he widely regarded as a wise decision, to keep that information to himself.

He also decided that maybe this whole nest business wasn’t too terrible. It soothed some deep, subtle unease that had settled into his bones when he wasn’t paying attention. He still maintained that he’d be just fine without all the blankets and shit in his bed but… well. Now those blankets smelled faintly of Bakugou. It could be worse.

This started a pattern. Shinsou and Bakugou would be cordial in their shared friend group, hanging out during the day, and going their separate ways back at the dorms. Some time after curfew, Bakugou would knock on Shinsou’s door, Shinsou would let him in, and Bakugou would make himself comfortable in the Katsuki-sized dent in the nest and would be out like a light. There was a wordless, unspoken understanding. A quiet ease. A bit odd, but comfortable. Gradually, they relaxed around each other.

Shinsou stopped giving a shit about what ratty old pyjamas Bakugou found him in. Bakugou stopped giving a shit about pretending to be angry all the time and gradually, ever so gradually, Shinsou started to see the tired, earnest, trying so unbelievably hard to make things look effortless, real Bakugou underneath the bluster.

There was one part of Bakugou’s inner workings that Shinsou had yet to parse out. Shinsou never wore scent blocking patches in his room, let alone to bed. The damn things itched. But even after a solid month of sleeping together- in the same bed, that is- Bakugou still showed up with the white patches on. He didn’t even wear a shirt half the time, but Shinsou was still stuck with hoping perhaps one of the patches would come loose in the night and he’d get a hint of that acrid sweetness that seemed to both soothe him and rile him up at the same time.

He’d long since stopped pretending to himself that he didn’t enjoy the way Bakugou smelled. What was the point? But the scent patch dilemma still nagged at him, so one night when he was particularly tired, he said ‘fuck it’ and opened his damn mouth.

“Why do you wear those patches?” He asked, and Bakugou froze mid-slow-motion-attempt-to-subtly-spoon-him.

“The fuck you mean? We gotta wear them, so we don’t stink up the classrooms and shit.”

“That’s not what I meant. I mean, why do you wear them now? We’re in our dorm rooms. Almost nobody wears their blockers in here.”

“Because I fuckin’ want to.”

“Really? I wear the same brand as you and I know they get itchy as fuck after a few hours.”

“No they don’t. Maybe you have pussy ass skin.”

“It literally says on the box not to wear for an extended period of time as the glands will get blocked and cause irritation.”

“Not mine.”

“Bakugou.”

Silence.

“Look, I’m just curious-“

“I didn’t want to stink up your nest.” Now hold the fuck up.

“Who said you were stinking up my nest?”

“I did. You definitely don’t want my stupid scent all over your space and stuff I know how sacred this stuff is for omegas-“

“First of all, you don’t know shit. Second of all, what? Where do you get off telling me what I do and don’t want.”
In the dim light, Shinsou watched Bakugou grimace. He’d stopped his gradual approach across the nest for the usual midnight physical contact- he’d long since stopped pretending it only happened in his sleep- and was watching Shinsou warily.

“Well? The fuck do you want me to do?”

“I want you to stop making yourself miserable. Don’t want you all twitchy in my bed because you’re all irritated.”

“You’re serious. You want me to take off my patches.”

“Literally the whole point of this conversation.”

“Ok, ok, fucking fine I guess.” Bakugou sat up and fumbled for the bedside light. “Suit yourself, but if you kick me out afterwards I demand at least one blanket from the nest so I don’t have stupid dreams.”

“I’m not going to fucking kick you out.”

“Fine, fine-“ Bakugou grumbled, rolling out of the nest. He half-stomped over to the trash can Shinsou kept by his desk and slowly peeled off one patch, then the other. Shinsou didn’t miss the lightning-quick glances Bakugou kept sending in his direction. Like he was checking on him. And then, as the patches fell into the trash, Bakugou just seemed to be standing there. Waiting.

“Well? Are you gonna come back to bed?” Shinsou asked, as the first wave of burnt saccharine hit his nose. It was a bit more bitter than he seemed to remember. Maybe it was just his heat talking. 

“You’re serious.” Bakugou said warily, almost like it was a question.

“The fuck are you standing there for? I’m tired and I want to go to sleep.” Shinsou patted the bed next to him.

“You sure you won’t mind? I know the smell can be a lot-“

“Bakugou I’ve literally told you I like the way you smell before.”

“You- oh. You did.” The bitterness in the air eased up. “I just figured because… it’s strong. And, I dunno. People told me it smells sweet.” Bakugou climbed back over the edge of the nest carefully, settling in to his usual spot.

“It does smell sweet.”

“That doesn’t bother you?”

“Why the fuck would you or my whole bed smelling like a creme brûlée bother me.”

“Dunno. Not very alpha-like.”

“You’re an idiot, Bakugou.” Shinsou shook his head, flicking off the light and grabbing hold of the man by his annoyingly tiny waist. Bakugou didn’t say a word.

Shinsou woke up the next morning with his mouth watering. Having Bakugou remove his scent patches the night before had had its desired effect. His room, his nest, even him himself, the entire thing smelled like caramel. He was noseblind to his own scent most of the time so he had to focus- but under it all there was a subtle mixture that smelled vaguely like rained-on campfire coals. It smelled nice.

Bakugou stirred, the arm that was thrown over Shinsou’s back gripping down slightly. Shinsou raised his head, immediately aware he’d been treating Bakugou’s chest like a down pillow, and met the sleepy gaze of the not-so-explosive blonde.

“Morning. You slept deep.”

Bakugou’s eyes widened as he stared down at the only slightly-smug face of Shinsou, seeming to become keenly aware of not only their position but also the fact that he was patches all at once. The hand resting on Shinsou’s back reached for the scent glands on his neck, bringing Shinsou’s attention to them as he somewhat reluctantly sat up.

“Oh shit, those look gnarly.” He grimaced. In the light of day the irritation of the glands was plain to see. Red and raised and looking very angry, the pair of glands looked highly aggravated.

“’t’s nothing.” Bakugou said at the same moment that he winced at prodding a particularly sensitive spot.

“That’s not nothing. How long have you been wearing your patches all day?”

“Not all day! I take them off to shower and shit.”

“Not the point.”

“Fine. Ever since I got back from- y’know. Kamino.”

“So ever since you started knocking on my door.”

“Yes, damnit, fine.”

“That’s not healthy, Bakugou.”

“You’re not one to lecture me on what is and isn’t healthy. I know you drink twice as much coffee as water on a good day.”

“Hey, I’ll have you know the bags under my eyes are designer.” They also had been slowly getting better over the course of the past month as his sleeping habits improved, but he wasn’t about to bring that up. “Seriously, though, those might be infected. You should see Recovery Girl.”

“The fuck I will.”

“At least let me help then. I’ve got first aid stuff.”

“Fine.” Bakugou gave in without a fight- far easier than Shinsou had been expecting. “Whatever will get you to stop nagging me about this shit.”
Shinsou grinned triumphantly, rolling out of bed and grabbing the kit he kept near his spare hero costume parts. Bakugou obediently sat cross-legged in the middle of the bed, still blinking sleep out of his eyes, as Shinsou climbed up on his knees next to him. Up close the glands looked even worse, and Shinsou muttered under his breath a quiet curse.

“Can you warm up my towel without burning it?”

“My quirk is explosions. I don’t know what the fuck you expect.”

“Noted.” He bailed to the bathrooms to run a glass of the hottest tap water he could get the faucet to give him and returned, dipping a clean towel into the warm water and gently applying it to Bakugou’s neck. The change was instantaneous. A low sigh of relief escaped Bakugou’s mouth, his shoulders dropping a whole inch as his head canted to the side.

Shinsou let the warmth work for a minute, hoping that the same care he usually gave his bumps and bruises would work here. He started to gently massage the skin in circles, checking in on Bakugou after a moment to see if he was grimacing in pain at all. The alpha was staring decisively at the corner of the nest, but didn’t seem to be in discomfort. His cheeks were perhaps a bit flushed, though.

Shinsou peeled back the towel and sanitized his hands before starting to gently prod the agitated gland. The heat seemed to have done the trick and softened the skin slightly because after a few moments of gentle massaging, oil started to seep out of the gland. Shinsou’s mouth watered despite his best efforts to maintain neutral because- well. Who wouldn’t be hungry if your nose was telling you there was this beautifully flambeed creme brûlée right in front of you?
Shinsou applied the warm towel once again, wiping away the excess oil, and moving on to the second gland.

“Idiot.” He muttered under his breath. “Scent patches twenty three hours a day for well over a month. Stupid.” He expected some snarky response but when it didn’t come, he glanced at Bakugou’s face. His head was tilted to the side, giving Shinsou the best access to both glands, but when he caught a glimpse of his face he couldn’t help but grin a little.

Bakugou’s eyes were almost closed, his face utterly relaxed and free of expression. His hands, originally balled into loose fists, were open and resting on his thighs. He looked almost blissed out. That expression stirred something in Shinsou- nope, nope, putting that deeeeep into the back of his mind, right the fuck now. Deal with that later.

Shinsou continued his diligent work, biting back a laugh when after a few minutes a quiet rumble started up in Bakugou’s chest. A sort of gravelly purr. It was… oddly adorable.

After a few rounds with the warm compress and a bit more massaging, Shinsou reached for the anti-bacterial lotion and applied it to both glands. The cool ointment seemed to wake Bakugou from whatever fugue state he’d slipped into and he blinked, seeming to come back to himself. The purring abruptly stopped.

“Shit. I fell asleep.”

“Sure. Feel good?”

“Yeah- I mean. Yeah. It felt good. Feels better.”

“I think you could get away with just covering up with a bandage today. Don’t want to irritate it more.”

“Sure, whatever.” He still seemed slightly dazed, but he reached for the bandages to hand to Shinsou anyways, then for his shirt on the floor. “Thanks, I guess.”

“Don’t mention it.” Shinsou applied the bandages and tried to quell the pleased feeling that was coiling up inside his chest. No, he wasn’t feeling all proud for taking care of Bakugou. He was just helping out a friend. Obviously.

Eagle-eyed Mina spotted the bandages when Bakugou loosened his shirt collar for lunch time, black and gold eyes wide and immediately yanking Bakugou in her direction.

“Oh shit, what’re those bandages for Bakugou? Finally got the guts to get the bite?” Kirishima tried to frantically shush her while Kaminari immediately leaned in to see what she was on about and Sero just looked mildly surprised.

“The fuck you on about, Racoon eyes? I just nicked myself shaving.”

“Sure you did, right over your scent glands. I bet Shinsou totally helped you shave your nonexistent beard.”

“What the fuck do you know about shaving, fuckhead?” Bakugou let off a warning explosion and tore himself out of her grasp, but her attention was already locked on Shinsou. 

“Hmm. Maybe not then. Never mind.”

“You guys are weird.” Shinsou said, taking a big gulp of his coffee.

Chapter Text

Bakugou wasn’t wearing the scent patches when he came to Shinsou’s that night, or the next. Shinsou’s nest and living space was soon saturated with the smell. This was great, except for when Shinsou woke up a few days later with sweat beading on his brow and his skin prickling. He wormed out of Bakugou’s embrace and slipped off to the showers, but even the icy spray couldn’t ease the fever. Worried he might have caught something, he quickly made his way to Recovery Girl before class.

“You’re fine, you’re just in pre-heat.” The old lady said after listening to his woes.

“I’m in what?”

“Pre-heat. It’s been about six months since your first heat, didn’t you notice your suppressant pills changed colour? Every six months they switch to a different hormonal blend so you have a heat every six months. Any less frequent then that and damage might start happening. I’ll let your teachers know you’ll miss the week. Do you want to go into a heat house or will a lock-down procedure in your room starting tomorrow be sufficient?”

“My room has a lock-down procedure?”

“Yes. All rooms come with safety features to keep unwanted individuals out, be it a villain attacking campus or a horny alpha.”

“Oh.” He thought of the sterility of the heat house and of his nest, already set up (and smelling of Bakugou). “I’ll stay in my room.”

“Of course. I’ll put the request in for a lock down starting tomorrow and have the cafeteria prepare some heat-safe foods to be delivered. If you need anything I recommend going shopping now before things get too heated.” The wrinkly old lady delivered the information free of the embarrassment that Shinsou sure was feeling- though, to be fair, she’d probably given this lecture a few hundred times over her career. “In the meantime I do recommend you not go to class. Especially given the volatility of your first heat, while this one is bound to be less intense, it never hurts to be careful. And if you do, ah, have a partner in mind, have them submit their rut leave and please see me after your heat for contraceptive to prevent any accidents.”

Shinsou’s face was bright red as he thanked Recovery Girl for her advice and bowed out as quickly as he could. He all but ran back to his room, where Bakugou had already cleared out to get ready for classes. He bit back a whine that seemed to want to jump out of his throat at the realization- damnit, was he already that much of a needy bitch a few hours into his preheat?

Not being allowed to go to class was both a blessing and a curse. A blessing because he couldn’t imagine sitting still while his skin sent prickling jolts up his spine every few minutes, and a curse because he was now stuck in his room with nothing to do but think about his coming heat stare at his room. He tried in vain to focus on studying but couldn’t focus for longer than a minute or two. He jacked off a couple times, but that only helped a little. His fever remained steady, though, and he didn’t feel any of the thunderous, gut-wrenching desire that had caused him to almost take a chunk out of Vlad King’s fingers in a bid to get free that first heat.

Shinsou occupied himself for most of the day deconstructing, reconstructing, and deconstructing his nest repeatedly, trying to get the right arrangement of blankets and pillows. He found a tank-top that belonged to Bakugou that had gotten kicked under the futon at some point, and that was a temporary victory. He placed it right in the centre of the nest with all the other materials that smelled the strongest of caramel and cedar smoke. It seemed like that was as close to satisfactory as he was going to get and he settled in for an uneasy nap right in the middle of his chaos.

Shinsou awoke to a knocking at the door. “Yo, Shinsou, open up.” Bakugou’s voice- alpha’s voice- said from the other side. A glance at the window showed it was afternoon- classes would be out by now.

“Hey, he might be sleeping.” Kirishima said, right as Shinsou opened the door. “Oh hey man, you’re awake-“ he trailed off, taking in the view of Shinsou in Bakugou’s tank top (when had he put that on), flushed and probably reeking phermones. The whole group was there- even Jirou was in the back. She was the first to react, grabbing Sero and Kaminari and starting to pull them both back towards the elevator as her cheeks turned bright red.

“Hi Shinsou! How are you feeling! Aizawa said you were sick so we all came to check up on you after classes-“ Mina started to say, but Shinsou’s attention immediately was elsewhere.

As soon as the door had opened, Bakugou had immediately straightened up out of his usual half-slouch. Spine ramrod straight, his gaze had locked right onto Shinsou while his nostrils flared, taking in the heady mix of pre-heat hormones. His pupils had narrowed, his brows furrowing and fists clenching. Shinsou cursed his stupidity for opening the door looking while also being thoroughly pleased at the prospect of fresh caramel for his nest.

“Glad to see you’re up and about.” Kirishima said, just as Mina stiffened next to him. “Let us know if we can get you anything from, like, the pharmacy or-“

“Get. Out.” Bakugou’s voice- if one could call it that in the moment- split the awkward air like a crack of thunder. The words were guttural, deep and gravelly as he turned to Kirishima and Mina, fists popping with suppressed explosions. “Both of you. Get out.” Mina covered her mouth and her nose and nodded fervently, grabbing a confused Kirishima by the shirt-collar.

“Wait what- oh.” Understanding dawned on Kirishima’s face as Shinsou seesawed violently between being very annoyed at the knot head posturing from the alpha in front of him and the thrill of pure hormonal bliss being shot directly into his nervous system. Fucking pheromone bullshit. “I’m just gonna… go.” He dodged an explosion, hardening in time, and let Mina pull him away. After they dashed into his room, Shinsou could hear them giggling.

“You didn’t need to do that.” Shinsou said, watching Bakugou as he prickled like a territorial hedgehog. He reached for one of his scent patches and slapped it on, hoping it would at least dial down the pheromones a little.
“The fuck I- I didn’t.” Bakugou blinked, relaxing. “Ah, shit.”

“It happens. Recovery Girl said I was in, y’know, preheat.” Shinsou scuffed his foot against the floor. “That’s why I wasn’t in class. She said I should just get my supplies and then hunker down. I guess they’re locking down my room tomorrow. I really shouldn’t have opened the door. I’m sorry.”

“Not your fault.” Bakugou replied in a grunt, nostrils still flaring. Was he scenting? “Should have texted.” He paused. “Do you, like… need anything? Supplies or food or shit?”

The entire contents of your laundry basket. “I think I’ve got everything taken care of, Lunch Rush apparently sends heat-safe food for the week up right before my room locks down.” God, the fucking internal preening. Was like Aoyama met a rooster and they had an illegitimate child and that child had taken up residence inside his chest. Aoyama and Tokoyami love child? No. No, that was far too cursed of a thought.

“Oh.” Bakugou’s shoulders slumped slightly. “Ok. Well. I can get you stuff if you need it, I’ve got plenty of things in my room- pillows and blankets and shit if you need things for your nest.”

Yeah, dirty laundry would be nice. Shinsou tried desperately to recall his one secondary gender sexual education class he’d taken back in middle school. Was this courting? Is this how one courted? Supplying nest materials… fuck. He couldn’t recall if that had been one of the platonic examples or not.

Cursing his past self for not paying attention more, Shinsou swallowed. Not having his own pheromones pumping out at such a ridiculous concentration helped clear his own head a bit, but Bakugou standing in front of him definitely scenting him was not helping. At all. He should have jacked off at least twice more before attempting to communicate like a sane person. “Ah, some uh. Some blankets or uh… a sweatshirt… would be nice?” Sweat beaded at the base of his neck. “Y’know. As, uh, friends.”
Bakugou stiffened almost imperceptibly. “Yeah. ‘f course. As friends and shit.”

“I’d give you something from my nest to help you sleep and shit but, uh, it’s kinda a mess right now.” Soaked in heady pheromones and probably some cum, definitely a mess. “Oh shit- fuck, I’m gonna be on lock down in my room. Will you be okay to sleep?” He lowered his voice to an almost-whisper.

“I’ll be fucking fine.” Bakugou grunted, though his eyes darted around suspiciously. “It’s just a few days, right?”

“Ah, I dunno. Could be a week. My first heat was, er, kinda insane. I don’t know how this one will go.” His cheeks were burning red and not just because of his elevated temperature.

“Fuck. Shit. Ok. I’ll figure this out. You should, uh, probably go back into your room? You kinda stink, dude. I’ll grab some stuff and be right back.”

“Fuck you.” Shinsou replied half-heartedly, rolling his eyes as he stepped back into the pheromone hell of his room. After a moment’s contemplation, he opened his window as wide as it could go. Any alpha, even Bakugou, would probably be affected by the sheer amount of desperate hormones his body was pumping out against his will. Shinsou threw himself down into his nest, immediately pulling Bakugou’s shirt up over his nose in an attempt to ground himself.

What the fuck was happening to him? What the hell was Bakugou playing at? Offering to get him nesting supplies, offering to get him food- it made that instinct-driven gremlin that he knew to be his stupid omega drive absolutely buck wild.

He pondered for a second if he could wring one out before Bakugou came back, and reluctantly decided against it. Besides, the ache between his thighs was making itself apparent more with evert passing minute, making the traditional jerk off session less appealing. Even if he was horny as all hell, the concept of Bakugou walking in on him mid-four-knuckle-shuffle was… well. It should have been more terrifying.

Shinsou pressed his face into his pillow and screamed.

He liked Bakugou Katsuki. He liked how Bakugou Katsuki made him feel. And he definitely wanted Bakugou Katsuki balls deep in his- Nope. Nope. Not going there. Not that desperately horny yet.

This provided several immediate problems. One, Bakugou Katsuki was Bakugou Katsuki. Two, they’d been sharing a bed for the better part of two months. His nest smelled thoroughly of that particular Alpha. Three… well. There was no way in hell this would go anywhere. They’d been sharing a bed, an alpha and an omega sharing a nest and nothing had happened. And now he was in pre-heat and Bakugou was coming and bringing him nesting materials and he was hopelessly, head over heels, absolutely shit fucked in love with the man who cursed him out regularly.

And the worst part is, Shinsou couldn’t dismiss this as his heat talking. Somewhere along the road, perhaps even at the damn sports festival, Bakugou Katsuki had reached right into his chest and wormed his way into his tired, tired heart. The sarcastic banter, the sleepy conversations, the rare moments of vulnerability and honesty, the crazy grin Bakugou got on his face whenever they sparred- it all made his chest do that delightfully horrible clenching thing. The fire in those red eyes, dulled to coals as they talked about everything and nothing in the wee hours of the night, whenever insomnia weighed down Shinsou’s brain.

Omega or no, there was something incredibly, irrevocably appealing to Bakugou. Some gravitational pull that dragged Shinsou in kicking and screaming, or perhaps just along for the damn ride. The moments of silence, early morning light filtering through his curtains, spilling across the pair of them when Shinsou could take the time to study Bakugou’s face while he still slept. The curve of his eyelashes. The barely-there furrow of his brow. The bow of his lips, pursed into a tiny scowl even in his sleep.
“I’m whipped. I’m whipped and I’m screwed because I’m a fucking idiot-“

“Yo, are you talking to yourself in there?” Bakugou’s voice jolted him out of his self-flagellating spiral as he knocked on Shinsou’s door. “I got the stuff.”

“Shit-“ Shinsou tried to get up but failed miserably, entangled in one of his blankets and almost bashing his head against the bed frame as he barely managed to catch himself before he fell spectacularly. After cursing under his breath and freeing himself, he opened the door to see Bakugou standing there, half buried under a few neatly folded blankets and several deliciously soft-looking pillows. Was that minke? Oh, it so was.

“I know you said you didn’t need anything but I had a bunch of protein bars in my room and I did some googling and a few omega forums mentioned protein bars as a way they kept their weight up while they weren’t hungry in their heats-“ Bakugou’s ears were as red as Shinsou’s face as he let him into his room. “Also I have some electrolyte drink mix because I heard it’s really easy to get dehydrated-“ He hesitantly deposited the blankets and pillows on the desk, and Shinsou didn’t bother attempting to stop himself from immediately grabbing them and inspecting the offerings.

“I know the really soft stuff is expensive online but my parents work in fashion and interior design and so they have contacts in the, uh, in the industry so I-“ he trailed off, as awkward and uncertain and… insecure? as Shinsou had ever heard Bakugou be in his life.

“These are wonderful.” Shinsou rubbed a blanket against his face, revelling in the softness of the fabric. “Thank you, Bakugou. You didn’t have to do this.”

“I’ve spent every night in your nest, the least I could do is get you some material to make it less shitty. Wait, no, I don’t mean that it’s shitty just that it could be better with some soft things- ah, fuck.” He grabbed the bag of food and drink powder and shoved in Shinsou’s general direction. Shinsou, who’d been mid-inspection of the materials and dealing with the disappointment that they were mostly entirely free of Bakugou-scent, responded with a protesting chirp-like noise that seemed to come from deep inside him. He covered his mouth immediately, eyes wide.

“Sorry- sorry, I just- it’s getting harder to not do dumb stuff like purring and shit. Instincts are getting stronger.”

“’s not dumb.” Bakugou mumbled, looking desperately torn between wanting to get out of that situation and not ever wanting to run away from anything. “Alphas do that shit all the time. Kaminari won’t stop with the purring when he beats anyone at a video game. It’s normal. ’N cute.”

Shinsou almost dropped the pillow he was currently trying to fit into his nest. “Cute?” He choked. “Did I just hear you call something cute?”

“Would you rather me say hell yeah it’s dumb as hell, you’re gross, get away from me?” Bakugou defended, expression growing ugly and defensive.“…no.” Shinsou went back to fixing his nest.

“You’re wearing my shirt.”

“So I am.”

“You really don’t know what to expect from this, uh, this week?”

“My first heat was the sports festival. The last thing I remember is walking down a hallway and abruptly passing the fuck out.” Ok, a lie, but what was he supposed to say?

“Next thing I know I’m coming down out of it after a week in a heat house with no idea how I got there, or any idea that I was an omega in the first place. Kinda glad I don’t remember much. I guess it can be really painful, and I’m pretty glad I don’t remember my, y'know. Secondary gender bits developing. Most people know what they are by my age and have the parts to prove it but. I had no idea. I guess it’s not impossible, just uncommon.”

Bakugou was silent for long enough that Shinsou started to think he’d finally managed to scare him off as he continued to hand Shinsou pillows. “Is it going to hurt?” Bakugou asked finally, voice uncharacteristically soft.

“I don’t know. I’m definitely aching, but. I don’t know how much worse it’s going to get or what to expect.” Shinsou tried to act nonchalant, like he wasn’t currently having a biological and emotional crisis about having to deal with his secondary gender for the first time in his memory and also dealing with the fact that he’d realized he was hardcore crushing on the alpha who had been sharing his bed with him and was now helping him build his heat nest.

“It hurts right now?”

“Kinda.” Shinsou shrugged.

Bakugou’s face twisted into a complex expression for a moment as he contemplated this information.

“Is there something I can do to help?” That did take Shinsou by surprise- and immediately induced more panic because yeah, a massage with those nice warm hands sounded fucking fantastic, but he was definitely sure that if Bakugou started manhandling him there wouldn’t be a snowball’s chance in hell his scent patch would hold up to that onslaught.

“I… I mean…?” Shinsou bit his lip hard enough to draw blood. Fuck. Why is this shit so hard! I should have stayed a beta.

“Shinsou.” Bakugou’s voice rumbled in his chest. “Do you want me-“

“Yes.”

“-to leave? Wait, what?”

Shinsou prayed for Deku to miraculously smash his way through the walls of the dorm and cause a spectacular distraction for him to flee the school and possibly the country. Bye, dreams of being a hero. Derailed by hormones and Bakugou Katsuki being so damn perfect.

“I, uh-“

“You want me to leave?” Shinsou barely caught the momentary crestfallen expression and hint of bitter burnt sugar on the air as he floundered, his own distress leaking out into the air as the scent of rotted wood in rain flooded from his glands, only partially caught by the patches. Bakugou stiffened even further, if it was possible.

“No. I don’t.” Fuck it all.

“You don’t?”

“No. Stay. Please. I really, really want you to stay. And it’s stupid and my everything is so confusing right now but the one thing I’m not confused by is the fact that I would infinitely prefer you, here, over literally anything else.” Shinsou clutched the pillow to his chest as a flimsy barrier, armour against the consequences of his words and the world.

“Shinsou.” Bakugou said, and Shinsou resisted the urge to meet his gaze, continuing his very intense staring contest with the ground. “Shinsou.” He said again, deeper this time. “Fuck. Hitoshi.” It was a hair’s breadth from a growl and it sent a shiver down his spine and physically pulled his chin up to meet fiery red eyes. “Do you mean that. Honestly.”

Shinsou hesitated, then nodded. He didn’t trust his voice.

“Genuinely. Is this your heat talking? Fuck, because if it’s just because you’re tripping balls on hormones, I’m not that strong, man. You smell so fucking good but I’m not gonna- I can’t-“

“It’s not. It’s not… not just because I’m in preheat. Fuck, even if I was a beta I’d still… I’d still want you to stay. Still ask you to stay. I…” he tore his gaze away from red rubies. “I’m pretty sure that even if I hadn’t gotten that whiff of you at the sports festival, if I had no clue about this pheromone shit, I would still ask you to stay. Please, Katsuki.”

Shinsou felt soft, warm fingers gently tilt his chin up to face his fate. Another hand tugged the pillow he was still clinging to out of his grasp as Bakugou was suddenly very, very close. His breath was hot on Shinsou’s face, eyes full of unreadable chaos and very readable longing. “You’re serious. You.. you want me. I don’t want to take advantage of this. Of your heat. I may be an asshole, good for nothing-“

“Fucks sake, I’m saying that yes, I’m crazy about you, I have been for a while, and if you can stand being around me I would really appreciate it if you would stay because there’s something about you that doesn’t make me feel like I’m adrift at sea and-“ Shinsou stumbled over his words for a second and looped his arms around Bakugou’s (annoyingly tiny) waist, and finally closed the gap between them.

Bakugou melted into the kiss immediately, shoulders slumping as a full-body shiver ripped through him and a rumble echoed from deep in his chest, teeth nipping at Shinsou’s lower lip as the alpha wrapped one arm around him and buried his other hand in Shinsou’s hair. Shinsou fumbled with getting one hand free to yank off his scent patch, flooding the room with earthy floral scent that spoke of exactly how much he wanted the alpha.

“Fuck. Hitoshi…” Bakugou murmured as Shinsou inhaled sharply, trying to catch his breath. “Smell so fucking good… I should have known it was you at the sports festival…”

“You knocked into me like an asshole. Sent me into heat. Recovery Girl thought I was possessed when I started following your scent out of the infirmary.”

“Your fight. Deku. You were hurt?”

“Not badly. I thought I was concussed because all I could smell was fucking caramel corn and she had no clue-“

“I was worked up after I fought Uraraka and she tore my patch off. I didn’t realize that it was you. That I sent you into, y’know. But after my fight with Kirishima I went back to the ready rooms and they were cleaning up the chaos. That was you…?”

“Guess so.” Shinsou replied with a heady laugh, starting to pry Bakugou’s scent patch off. He wanted more of that mind-numbing sweetness, that smokey fire on his tongue… Bakugou caught his nimble fingers in his own, threading them together as he pulled Shinsou in close.

“I should have known. Fuck, you smell the same- but I was so angry that day and I didn’t even notice.” Bakugou nosed at Shinsou’s scent gland, sending a shiver down the spine of the omega. Shinsou’s head tilted to the side automatically, giving him better access as the alpha inhaled deeply. “If you don’t want me locked down in here with you, this is your last chance to say something because you smell like sin and I can’t hold back much longer.”

“If you leave me right now I’m going to cut your balls off.” Shinsou snapped, getting fed up and kissing his way down Bakugou’s annoyingly cut jawline, nipping at the tender skin of his exposed throat. A groan escaped Bakugou’s mouth and the hand that was currently holding Shinsou against Bakugou’s disappointingly clothed chest slipped under Shinsou’s shirt, sending tingles up the small of his back. With a trill of victory, his teeth latched on the scent patch and he tore it off in one swift movement.

“Fuck-“

“Shinsou, baby-“ Bakugou groaned as the heady scent of rich caramel filled the air, carrying with it no pretences about exactly how the alpha felt about him.

“Shirt. Off. Now.” Shinsou grunted, attacking Bakugou’s lips once more as the alpha floundered for words.

“You’re a feral little fucker, aren’t you? Should have known.” Bakugou hissed as he scrambled to get a grip on his shirt and pull it up over his head. “Fuck- move, I can’t take off my shirt if you keep trying to eat my face-“

Shinsou reluctantly pulled back long enough to let Bakugou get his shirt over his head and throw it into a far corner, but a moment later the alpha was with his chest fluttering against Shinsou’s ribcage as they both took shuddering breaths.

“We’re doing this.” Shinsou murmured, cupping Bakugou’s face in both his hands.

“Fuck, yeah we are.”

“No biting. No mating bites.”

“Yeah… good call.” Shinsou could almost see his alpha’s ears droop, but he knew that they had to have this conversation now. Before he fell too deep into heat. He tugged the alpha in the direction of his nest.

“We need to be smart about this. We haven’t talked-“

“We talk all the time!”

“We need to have a clear, level-headed discussion about us, when we’re not both high on hormones. So no mating bites.”

“Other bites?”

“Other bites. Fine. But if you treat me like a chew toy I’m turning your back into shredded cheese.” Shinsou’s legs hit the futon and then he was falling, and Bakugou was coming with him. His back hit the wall of his nest and he stared up into blazing fire. The smoke in the atmosphere was thick, the air was candy on his tongue, and the eyes of Bakugou Katsuki were eating him alive.

“Hitoshi. Can I call you Hitoshi?”

“Keep looking at me like that and I’ll let you call me anything you want.” He breathed, lifting his hips to roll them up against Bakugou. “Katsuki.”

Bakugou’s lips were on his throat, a hand in his hair, his body pinning him to the nest as Bakugou lapped at the sensitive skin over his glands. “You smell… so fucking good. Making my mouth water. Gonna drive me crazy.”

“You’re- ah- you’re one to talk-“ Shinsou gasped as he wrapped his legs around Bakugou’s hips. “Fuck, Katsuki-“

“Been driving me crazy. Can’t sleep without your scent. Can’t sleep without you. Can’t wake up not having you in my arms.” Bakugou murmured, nosing his way down Shinsou’s throat, tugging at his stolen shirt until Shinsou obediently let him remove it. “Fuck. How are you so fucking perfect-“

“Don’t say that. ‘M not perfect. I’m built like a beta- thought I was a beta- I don’t have the curves or-“

“Shut the fuck up, dumbass, I said you’re perfect. You’re perfect.” Bakugou cut him off with a snarl, teeth digging in to the hollow of his throat almost hard enough to break skin.

“You really know how to make a guy feel special- oh-!” Shinsou gasped as a wayward hand slipped down under the only remaining item of his clothing- his briefs. “Kat-suki~” he breathed, not able to stop his hips from canting up against the exploring hand. “Fuck-“

“You may be on to something, though. Your dick is way bigger than most omegas. Still tiny compared to mine-“ Katsuki started to say, ducking out of the way with a guffaw as Shinsou went for his throat, fangs-out and hissing. “But you said you were in pain, earlier? It hurts?”

“Aches. My hips hurt. Abdomen hurts.” Shinsou admitted. “Doctor said that things were still developing, so it would probably ache a bit.”

“Mmm.” Katsuki hummed, pulling Shinsou’s briefs down to mid-thigh. Shinsou flushed- an even deeper pink than he already was- and tried to cross his legs, tried to cover up some of the exposure. “Don’t be like that.” Bakugou murmured, pushing his knees apart with a gentleness Shinsou didn’t know he was capable of. “I want to see you. All of you. I want to make you feel good.” His hands were on Shinsou’s hips, then, warm palms gently kneading at his sides and fingers digging in to the tense bundles of muscle fibres.

“Ohh-“ Shinsou’s breath left his body in a heady groan. “Fuck, Katsuki-“ while the internal drive in him to jump alpha bones was really disappointed in the turn this had taken, the sheer relief of hot hands wringing tension and stress from his changing body was more than enough to distract the still-sane parts of himself.

“Just relax. I’ve got this.” Katsuki murmured, lips ghosting against his skin, skimming the tuft of lilac hair and chasing down the aches and pains with remarkable precision. “I’ve got you. It’s going to be just fine.” Shinsou’s eyes almost crossed when Bakugou’s thumbs dug right into the aching parts of his abdomen where he knew his secondary gender was manifesting itself. “Easy, easy-“

“Hurts so fucking good-“ Shinsou groaned, hiding his face in the crook of his elbow to muffle the noises that were involuntarily escaping him. “Shit-“ a moment later an entirely new pleasure was made aware to him as the tip of his cock was suddenly surrounded by wet heat. “Kat-suki-“ he cried out, hips bucking as Bakugou wrapped his lips around his cock, swirling his tongue around the shaft like it was his job.

“Hush, going to make you feel good. Going to make you feel the best. Only the best, from me.” Bakugou shushed him when he pulled off for a moment, still with a soothing grip on his hips as he kept sucking Shinsou down, down, until his lips kissed the base where they met lilac curls and hidden folds.

“Feels so good, you’re so good, best Katsuki, best alpha-“ Shinsou breathed, hands fisting in the materials of his nest. “Shit, I’m so sensitive- Kats, I’m not gonna last-“ he tried to warn, but Bakugou only intensified his ministrations as the alpha sucked his omega’s cock, drew out every stifled moan and cry until Shinsou shuddered, head to toe, and spilled impotent cum down his throat.

“Did that help you feel better?” Bakugou asked, sitting back on his heels and wiping his lips free of drool and cum.

“Oh, man, did it-“ Shinsou breathed, sitting up and bracing himself on shaky arms. “I’ve jerked off like four times already but that- that was something else.”

“Course it was. I didn’t practice all that for nothing.” Bakugou shrugged off his praise with his typical confident bluster, but the pink tinge to his cheeks spoke to how pleased he actually was.

“You practiced that?” Shinsou gaped at him. “What? How does one practice sucking dick? Did you and Kirishima-“

“No! No, oh my god, no, like I’d ever suck Shitty Hair’s shitty dick-“ Bakugou scoffed. “I got a toy, and practiced on that. Wanted to make sure that you- whoever I found- would know I’m the best. You won’t get that from anyone else.” His chest- yep. His chest was actually puffed out. He was peacocking, alpha bravado and confidence, after sucking the soul out of Shinsou’s poor oversensitive dick. 

“Wouldn’t want it from anyone else.” Shinsou murmured, looping his arms around Bakugou’s neck. His neck which was too bare, to perfect, he decided. He selected a patch of skin a safe distance from anything important- away from the delicious oils seeping from that alluring pair of glands- and bit down decisively. “Mine.” He declared as Bakugou inhaled sharply. “My alpha. Best. Knows how to make me feel good.” He purred, delighted at the shudder that ran down the blonde’s entire body. “Take me to my nest,  alpha.” He was sinking, fast, his heat rising twice as quick now with the heady alpha pheromones in his room, but with his arms around Bakugou and pleasure and need singing through his whole body, he could not find fault with anything.

Chapter Text

Bakugou was a weak, weak man. He put on an air of bravado and confidence, a personality as strong and explosive as his quirk, and yet deep down inside he was weak when it came to the lilac siren beneath him. He’d been pining over this snarky omega for months, ever since that night of desperation, after not sleeping for four days, had brought him to Shinsou’s door. After he’d taken one look at him, let him in, and not breathed a word about it to the outside world.

After he listened to him, he was intrigued. After he took none of his shit, he was invested. And after he just simply fired right back whenever Bakugou would get angry or irritated or get in too close and yell- well. He was hooked.

It hadn’t taken him long to realize that it was not the quirk of the omega that let him sleep through the night. After he woke up in the middle of the night one time to his arms wrapped tight around Shinsou and a rumbling purr going in his chest, he knew. He knew he was in deep. But, being exactly who he was, he hadn’t the slightest clue as to what the fuck to do about any of it. He tried to google things online but that just ended up with him insulting Shinsou’s nest by accident and after that he just pretty much gave up. Bakugou Katsuki gave up.

He had the ability to hold Shinsou at night, in the darkness and privacy of the pretence of sleep. He could be happy with that. And for a while, he was. They grew closer, slowly in public and quickly in private. They started to automatically slide into place beside each other in the comfort of the nest. Hands wandering, lips ghosting, bodies pressed together as one. And then Shinsou talked him into going without the scent patches and took care of him and for once it didn’t feel patronizing. It didn’t feel uncomfortable or vulnerable. It just felt good.

He’d reacted violently when Shinsou opened the door because no amount of secret scenting while pretending to be asleep would have prepared him for the smell of Shinsou in pre-heat. For a moment his vision went all fuzzy and red at the edges and all he could think was get them away. Take him inside. Be alone with your omega. He’d come back to his senses quickly but the scent of intoxicating lavender and thunderstorms followed him as he stumbled his way through offering nesting materials. And then by the grace of some god, Shinsou did not kick him out of his room. He asked him to stay. And now Bakugou Katsuki had just sucked his omega’s- the omega’s- dick and loved it and now Shinsou was pulling him deeper into the nest, deeper into the heat, and he couldn’t help feeling like he was the luckiest bastard in the world. 

Shinsou pounced as soon as Bakugou stepped foot inside his nest. “Stay.” He ordered, pushing the alpha down into the middle of the nest, in the middle of the swarm of blankets and throwing a leg across him to sit on his chest. He almost got distracted- god, who would have believed that he’d be here, looking down at Bakugou Katsuki’s bare chest, a sight many men and women would kill to see- but quickly got to work appeasing the buzz in his veins, the drive that told him to make his nest perfect.
There was a distinct satisfaction to pulling plush blankets, tucking in corners, arranging pillows. The unease and dissatisfaction of earlier was completely and utterly gone. The missing piece- the alpha he’d gotten somehow irrevocably into a mutual-attraction disaster with- was now smack dab in the middle of his space. Right where he belonged. It was like being submerged in perfectly cool water in the middle of a hot summer’s day. Blissful.

“You’re so beautiful.” Bakugou murmured, pulling Shinsou’s attention away from the incredibly important task of fixing a pair of pillows and scenting them. “I know you think you don’t look like an omega or whatever, but all I can see right now is that clearly I did something good in a past life because I sure as hell don’t deserve you.” 
“You’re saying that I’m not right for you?” Shinsou bristled, placing both hands on Bakugou’s well-muscled shoulders and pinning him down in the nest. “Stay.”
“No that’s- not what I meant.”

“Less talking. You’re saying dumb words. Stop.” His sentences were getting shorter, as eloquent communication became less important than getting his alpha to stay put in the nest right where he belonged while he focused on making things perfect. It was very tempting to ditch the nest-making task and focus on the bulge in Bakugou’s pants he could feel pressing up against the cleft of his ass, but the diminishing rational part of Hitoshi’s brain knew that if he didn’t get things right while he still had some of his wits about him, it would probably drive him nuts through the heat. And he wanted things to be right. He had his alpha in the nest, ready and willing, and he was not about to mess it up now.

“Shinsou. Shinsou it’s fine. Hitoshi. You’ve fixed that pillow five times.”

“It’s not right!”

“Give it to me.” Bakugou reached for the offending item and Shinsou hesitantly handed it over. Bakugou swiped the soft fabric over his scent glands- Shinsou ignored the irrational jealousy that bubbled up at the gesture (being jealous of a pillow? Really?) and grabbed it back with a bit more force than necessary, shoving his face in it and inhaling. Ah, that was better. Now when he put the pillow back in its spot, it felt right. It smelled right. The nest smelled like them both, soothing mixtures of sweet floral and forest surrounding them completely. Shinsou sat, perched on top of Bakugou, and surveyed his territory.

“It’s done.” Bakugou told him, both hands settling heavy on his hips. “You did good.” Shinsou hesitated. Surely there was something else he could do, something that could be better? “Stop overthinking. I don’t know how much harder my dick can get and you’re smelling better with every passing second. You’ve done plenty.”

Shinsou rocked his hips back, brushing up against the sizeable presence in Katsuki’s pants. “You’ve done well. Now let me take care of you.” Strong arms wrapped around him and pulled him so their chests were flush against each other. In one smooth movement, Shinsou was on his back, swathed in the comfort of his nest and a heady sweet scent that was growing spicier, hotter, with every passing second. Sharp teeth nipped at the sensitive skin beneath his jaw and his lips parted in a soft sigh. 

“Gonna take the best care of you. Be the best for you. Gonna fuck you so good, Hitoshi.” The alpha growled next to his ear, rolling his hips and dragging the annoyingly clothed erection along his core. The friction against his own sore cock and teasing at his folds dragged a whine from Shinsou’s throat. “Gonna make you mine.” The heat was rising, his skin tingling with even the slightest touch. The ache was growing with every passing second.

“Need you. Need you now.” Shinsou breathed, hands clumsily grabbing at the waistband of Bakugou’s pants. “Why are you hiding. Please. Need you to fuck me. Hurts.” There was a moment of pause and then the sound of ripping cloth. Shinsou’s nest gained the addition of a shredded pair of pants, the scent of alpha precome joining the mess of pheromones in the room.

“Fuck, Shinsou- you smell so good. So perfect. So delicious.” Bakugou grunted, rutting his freed erection up against Shinsou’s own cock. Hitoshi couldn’t see anything except Bakugou, his vision a mess of blonde spikes and flashes of strong, smooth back muscles, but his cock felt huge against his own. Perhaps it was for the best that he couldn’t see exactly what was going on down there.

Not being able to see didn’t make the fingers that suddenly were pushing, prying, at his folds any less sudden or needed. “A-Katsuki-“ He cried out, the soundproofing or lack thereof of his room the furthest thing from his mind at the moment. “Feels- feels so good-“

“Shit, you’re tight. So hot- have you even touched yourself down here? You’re shaking…”

“Never. Never did- fuck, please, it hurts. I need you.” Shinsou panted, his fingers clawing into the bare skin of Bakugou’s back. He was holding on for dear life. “Hot. Need you.”

“Fuck, ok, I- I don’t know if I’ll fit.” Bakugou took in a shuddering breath but he pulled back slightly. Shinsou whined, but the plaintive noise abruptly cut off when he felt the tip of his alpha’s cock pushing at his entrance. He couldn’t see anything, but deep down he instinctively knew exactly what it was.

“Please, Katsuki- Alpha-“ he was almost entirely submerged in his heat now, the drive to mate and mate and mate again, to claim this alpha in his nest as his own was all he could hear in his own brain. “Need you!” He cried, trying to bite at the nearest available bare skin in an attempt to motivate his alpha to just fuck him. Need burned in his veins like pure fire and he couldn’t stop the cries coming from his own throat, enticing chirps and trills meant to entice any sane alpha with at least one ball to come and fuck him.

“Shit-!“ Katsuki cursed, driven by his own instincts. Shinsou cried out as the head of the cock slipped inside him, passage eased by the slick that his body was producing like it was its job- which, in its heat, it was.

“Alpha- alpha-“ He was losing himself rapidly, heart pounding in his chest as need gripped him as hard as it did at the sports festival. “Please, please- I need your knot, please-“

“I’m trying. You’re so tight, you’re so- fuck- you feel so good but I don’t want to hurt you-“ Bakugou’s fists were clenched tight in the nest, knuckles white with the effort of his restraint.

“Not hurting. Feels good!” If he’d been a bit more sane in the moment he would have felt the stretch, the burning heat that tipped the scales just past pleasurable- the most he’d ever had inside him was a couple of his own fingers, and the shaft of Bakugou’s cock was a lot more than a couple slender digits. How thick was his knot? If it was much more than this he felt like he might break, but the drive to get Katsuki to claim him was far greater than concerns like that.

“Shinsou we can’t, I don’t want to-“ Bakugou’s frantic attempts at reason- both trying to reason with the half-feral omega and with himself- were abruptly cut off as two shockingly strong legs wrapped around his waist in a lock that Aizawa would have been proud of. “Fuck-“ He cursed, trying to break the hold, but it was too late. With one swift tug, Shinsou yanked the alpha forward. In one smooth move, Bakugou was buried up to the hilt in tight, sweet heat.

“!” Shinsou cried out, a wordless exclamation as Bakugou’s knot popped on the spot, stopping the alpha in his attempts to try to pull back out. He was so tight, so unbelievably tight around him, Bakugou couldn’t believe that he hadn’t felt some level of pain as he was penetrated. 

Hitoshi twitched around his alpha’s cock once, twice, full of feverish delirium and deep satisfaction, and then his eyes rolled back in his head and he knew no more.

Hitoshi woke up to a pain in his sensitive chest. “A-alpha?” He tried to speak, voice high and hoarse. His throat was sore, his vision was blurry. Was he crying? He felt good, floaty and not-quite-real as his rational mind attempted to take control. But his heat was well and truly going now, fire racing in his veins and despite the satisfaction that came from somewhere in his core, need was bubbling just beneath the surface.

His vision slowly started to focus and he could see just a few things. He knew he was in his nest, he knew he was on his back, and there was something on top of him. A halo of soft blonde spikes rested on his chest, and his body was shaking- the pain that had prickled and woke him up was two sets of clawed fingers grasping his sides, digging in to the point where they broke skin and drew blood that he could feel lazily running down his overheated skin. A strange noise was echoing from the odd blonde creature on his chest. The air was sour, his nose scrunching up as it picked up on bitter distress.

“-lpha-“ he tried again, his body shaking as the being clinging to his chest trembled. He had more success that time, and the blonde creature jolted in surprise. A teary face peeled itself off his sticky chest and the scared face of one Bakugou Katsuki stared down at him. He’d been clinging to him, shaking, terrible choked noises coming out of his mouth.

“You’re- you’re alive?” Bakugou asked, sounding different than usual. His voice was raw, hoarse, but there was a different quality to it. He felt different.

“‘m alive, I’m fine, what-“ he inhaled sharply as the alpha moved and Shinsou felt a strange tug in his gut. “Shit-“ he breathed as an alpha knot tugged at his walls until it slipped free. A rush of fluid followed, and a pang of instinctual disappointment followed. 

“Thought you were dead.” The alpha whined, hugging him close and ignoring the mess his spent cock was making, drooling come over the both of them as he clutched the smaller man to his chest. “You made this noise… then you went limp…” he nosed at the scent gland at Shinsou’s neck, coaxing a gasp from the omega. “Thought I’d killed you.” 

Dimly, Shinsou connected what had happened. He’d passed out when he was knotted- the rush of pheromones hadn’t been entirely unlike what had happened in his first heat. Bakugou freaked out when he went limp, and the distress had caused him to regress into a more base state. Shinsou was talking more to his alpha instincts than Katsuki at the moment.

“Didn’t kill me. Just got overwhelmed.” He murmured, the knotting and the subsequent fainting episode bringing him some temporary clarity in the lull of hormones. “Happened to me before, at the sports festival. I’m okay. You didn’t hurt me.” Well, the last statement might not be entirely true. He was a bit savaged by the panicked alpha’s attempts to try to wake him up- there was a sting in his right cheek. The brute slapped him while he was out?

“You’re ok? Not dead?” Seeing the worried expression and wide eyes on Bakugou’s face would have sent Hitoshi into stitches at any other point, but instead of laughing he just rolled his eyes and sighed.

“I’m fine. Felt good. You’re fine.”

“I’m good? Took care of omega?” Bakugou said, still nosing at his scent gland until Shinsou pushed his head away. He didn’t want to accidentally get bitten while Bakugou was reduced to this more instinct-driven state.

“Yes. You took… good care of me.”

“Took good care of my omega.” The alpha finally seemed to get it into his thick head and Hitoshi felt hot hands skimming over his chest and poking at the scrapes and pinpricks with surprising gentleness. “Made my omega feel good. Good job.” Shinsou couldn’t help the grin that spread across his face seeing Bakugou so intent on inspecting him and making sure he was okay.

“Easy, big guy-“ Shinsou gave him a little nudge as he poked a particularly sensitive scrape. “Fuck, you really did a number on me. Sorry to freak you out. Just… if that happens again maybe don’t try and slap me awake?” He glanced at the window to try and see how much time had passed, and noted that steel bars had slid into place across the window. Ah. Lockdown must have been initiated while he was out. Must have been an hour or so. “Still. I’m a little bummed I missed out on losing my virginity.”
That seemed to stir something in the alpha. “Omega? First knot?” He pulled back, sitting on his haunches, and Shinsou squirmed as hot fingers pried at his entrance. Yet more come leaked out.

“Yes, idiot. I’ve never had sex with anyone before. I’ve only been presented for six mo-ooh my god!” Shinsou’s back arched as Bakugou decided that his superficial inspection was not sufficient and buried his face between Shinsou’s legs. Having avoided that part of himself in the past few months, it felt very strange to have someone down there. Especially- oh god, that was his tongue.

“Mine. All mine.” Bakugou growled before Shinsou felt his tongue lick a long stripe up his folds, gathering whatever slick and come had mixed there. It was warm- almost as hot as the hazy memory of being pierced by Bakugou’s knot. And Shinsou, although granted a few minutes of clarity thanks to the initial knotting before his heat would inevitably kick back into high gear, was still incredibly sensitive.

“Shit- Katsuki- oh fuck, there, right there-“ he cried out, trying very hard not to squirm too much as Bakugou traced the inside of his cunt with his tongue. His tongue brushed over something that sent pure electricity running up Shinsou’s spine and he let out a breathy moan as his legs locked around Bakugou’s shoulders. “That spot. Right there- keep going- ohh, Katsuki, Alpha-“ the building pressure suddenly burst forth from the dam and his cock bobbed, ignored but spilling thin come nonetheless across his stomach. 

Shinsou was left gasping and stunned; he’d never had an orgasm from doing anything besides jerking off and this- this was different. Though the pressure had climaxed and subsided, it still hummed in his core and buzzed in his brain. He felt fuzzy, breathless and lightheaded, and- “Bakugou- Katsuki please slow down-“ he cried out as Bakugou barely paused for breath before continuing his thorough cleaning and examination of Shinsou. The pressure was building again, impossibly, while he was still recovering from the previous orgasm. It hurt, almost, his core tingling and burning as the devilish tongue continued to lap at sensitive, quivering walls.

“No. Mine.” Bakugou growled when Shinsou tried to push his head away so he could catch his breath for one damn moment, snapping fangless teeth at his fingers as a false warning. “Mine.” He growled, and drove his tongue home with such precision that Shinsou could only warble a watery cry as he came for the second time in as many minutes.

Overstimulated, with tears in his eyes, Shinsou got a handful of blonde tufts and yanked at it. Bakugou hissed, but pulled his dripping face from between Shinsou’s legs. That damn tongue licked at glossy lips, gathering come and slick so not a drop was wasted as the alpha breathed deep, heaving breaths. “Enough.” Shinsou told him shakily, trying to sound strict. How was he supposed to bargain with a Bakugou that was still half-feral. “You did good. Made me feel good. But I’m-“ what should he say? Done now? Would that be a rejection? “I am hungry. And thirsty. Can my alpha get me something to eat and drink?”

If Bakugou had animal ears they’d have perked up instantly and he immediately let go of Shinsou’s legs and popped up to attention. “Omega hungry. I bring food! I find food.” He exited the nest with surprising care and grace, taking measures to not knock over the walls or disturb Shinsou’s carefully arranged pillows. There was the sound of rustling paper bags, and the inspection of several goods.

Shinsou took the moment to catch his breath and move his sore legs. Ah shit, it’d been one round and he was definitely achey. The heat at his core soothed away the strain, though, and he propped himself up on his elbows and finally got into a sitting position. Seeing Bakugou crouched in a squat on the floor, bare ass and dick and balls dangling free as can be, was both parts absolutely hilarious and also… very enticing. All those workouts did wonders for that ass. He wasn’t as stacked as Midorya, who was fighting more and more with his legs these days, but he had a very nice trim waist and was nicely defined. Very delicious. 

Horny dog that he was, he was also genuinely thirsty. He wasn’t so big on food but when Bakugou deemed certain things suitable from his examination of what he’d brought and what had been delivered before the lockdown, he was more than happy to take the offered bottle of water mixed with electrolyte powder. His nose scrunched up at the false fruit flavour but when Bakugou shoved the bottle in his face he drank gratefully. He finished half the bottle in one go and no sooner had he finished then a protein bar was being shoved up against his lips.

“Oh- yeah, okay, big guy, I’m eating-“ he took the bar from Bakugou’s grip, took a big bite and slowly chewed. It tasted like cardboard, but that was fine. He wasn’t big on food right now. The post-knot clarity was definitely receding as he ate what he could stomach, sharing the rest with his alpha. Bakugou seemed to be changing too, pupils expanding back from their initial pinpricks as his body relaxed. After not speaking for a while, Shinsou took the opportunity to throw their trash in the vague direction of the bin and settle in to his alpha’s lap.

Katsuki blinked down at him as Shinsou started to purr, coaxing the sound willingly out of his own chest. The pleased vibrations seemed to help ease the alpha out of his feral state.

“Hitoshi?” Bakugou spoke finally, clearing his throat. “What happened?”

“Welcome back. You knotted me, I passed out, you went half feral and thought you’d killed me. Woke up to you clinging to me. Then you ate me out and wouldn’t stop until I distracted you by saying I was hungry. Been an eventful couple of hours.”

“Shit. Sorry. I think? I think I’m sorry.”

“You’re fine. I’ve been clearer-headed after I woke up. Think knotting helped and I’m still not quite in full heat yet.” Bakugou wrapped his arms around Shinsou’s chest and Shinsou rested his own arms on top of Bakugou’s broad forearms. “You were adorable, though. You were so scared you’d hurt me.”

“Did I?”

“Just a few scrapes. I think you slapped me in your panic to try and wake me up though. I’m getting you back for that one next time we spar.”

“That… is fair.” Bakugou rumbled in his chest, nosing around in Shinsou’s purple mane. “Sorry.”

“I have a feeling you’ll have plenty of opportunities to make it up to me.” Shinsou replied, letting his legs fall open. The smell of fresh slick hit the air. “Think it’s time to go again. Slower, though. I’ll try not to pass out this time.”

“God, I’m so fucking lucky.”

Shinsou fell deeper, quickly, into his heat, and the next three days were filled with a feverish pattern of getting knotted, waiting out the knot while they mauled each other with their mouths, Bakugou enthusiastically eating him out, Shinsou enjoying a few minutes of clarity while Bakugou tried to make the heat-safe food as edible as possible, drank water in copious quantities, use the ensuite restroom while his alpha insisted on not leaving him alone in the room and watched over the doorway protectively, getting carried back to the nest, getting knotted again, and sleeping fitfully. 

He’d get the occasional blowjob and had tried giving one once- Bakugou knotted his mouth and they spent an hour waiting for it to go down. They decided to try that again some day when they weren’t both hopped up on hormones. Pulling out just… wasn’t feasible at the moment.

On the fourth day, Shinsou woke up feeling distinctly more like himself. He’d heard on the internet spending a heat with an alpha could shorten it so… that was definitely a relief. And while being in heat sucked objectively he couldn’t find much of a problem with his current position, with Bakugou between his legs.

“Mmm.” Katsuki stirred when Shinsou tried to shift his position. “Morning, omega.”

“Morning Kats.”

“You’re back to calling me by my name. Feeling more normal?”

“More than before. Definitely-“ he winced as he moved and felt fluids leak out of him. “Definitely more sane than I’ve been in days.”

“Pity.” Bakugou replied, leaning in to give him a soft kiss on the lips.

“Ew. Morning breath. And what do you mean pity?” Shinsou replied with a halfhearted glare.

“I’ve enjoyed you waking me up every few hours whining for my knot. Figured you’d drain me dry after the first twenty times but you’re just… mmm.” He gave Shinsou’s scent glands a luxurious drag with his tongue, and the omega shuddered. “Delicious.”

“Knothead.”

“Slut.”

“Only for you.”

“You’re mine.” Bakugou agreed, laughing. The sound was soft and bright and Shinsou couldn’t help but smile. Then his stomach growled. “Hungry? Think you could handle some real food?” Katsuki asked, looking him over. “I tried to get you to eat some vegetables yesterday. You spit them back in my face. Wanted only yogurt and chilli chocolate. The latter of which is definitely not on the list of approved heat foods. Had to suck your dick to distract you from whining about it.”

“Oh how horrible. Poor you.”

“Poor me indeed. Stuck in a room with no choice but to knot a beautiful man over and over and over-“ Shinsou threw a pillow at him. “Oi! Fine, fine, I’ll get you some food.” Bakugou crawled out of the nest and Shinsou immediately missed his warmth. He bit back a whine and buried his face in the blanket Bakugou had been tangled in. Mmm. Smelled good.

“Here. It’s a smoothie- yogurt and blueberries and spinach and avocado in it. Plus banana. Got to get your potassium back up or you’ll be cramping when you go back to training. Kaminari bitched about it for weeks.” Bakugou handed shinsou a bottle and he drank it down thankfully. He barely even tasted it- he was just hungry and his throat was dry and his mouth was stale. He took the protein bar Bakugou handed him next and ate that slower. “You’ll be starving once you’re out of this fully. We’ll both need to get our calories back.” Shinsou examined the alpha in front of him, noting that he while he seemed just as muscled and defined as before, his face was more angular. He’d lost some weight. Shinsou glanced down at himself and poked his own bare stomach.

“I got fat.” He mused, poking at the slight swell of his stomach. There was a distinct bulge where there hadn’t been before.

“That’s an uh. Omega thing. Your body is storing fats and… things there. It’ll go away. You’ve barely been eating anything the last few days and we’ve both burned a lot of calories. You’re surprisingly acrobatic when you want my knot.” 

Shinsou’s cheeks were pink and he quickly went back to eating his protein bar. He could still feel the heat thrumming in his veins- it was subsiding, but it was far from over. He could feel the ache building gradually between his legs once more and it was with a dusting hum of satisfaction that he watched Bakugou climb back in to his nest.
“You eating too?” He asked, fidgeting. He just wanted some friction. Katsuki noticed, of course, and grabbed the water bottle from Shinsou’s hands.

“Already ate. Looks like you’re ready for another round, eh?” His grin was lopsided and cocky as he placed the bottle out of the danger zone. “Even when you aren’t out of your mind and heat-brained you still can’t get enough of me.”

“Nope.” Shinsou replied plainly, shrugging one shoulder. “You’ve got a nice cock. Fits nice inside of me. Like it was made for me.” He purred, trying to roll over on top of Bakugou. Two arms pinned him down, caging him in, as Bakugou hovered over him.

“Ooh, you’re getting feisty. You’ve been a nippy little shit the past few days.”

“I’m not the only one, I look like I was attacked by a cheese grater.” Shinsou shot back. “Damn miracle you didn’t lose your head to the knot and mark me. Guess you get to keep your balls after all.”

“You wouldn’t get rid of my balls. You like them far too much.” 

Shinsou could admit he had a point and he gave a second attempt to try and throw Bakugou over onto his back. He wanted to see how his face looked all flushed in his nest with a clear(er) mind. But the alpha wasn’t having it.

“Mmm, no. I don’t think so. Impatient omegas get to sit there and learn how to take it. I want to watch you fall apart.” Bakugou purred in his ear, grazing his jawline with fanged incisors. “Want to smell how your scent changes and how you whine and moan and say my name-“

“Kats, want to see you, want to be on top-“

“Mmm, maybe later, right now-“ Shinsou’s head fell back and his back arched as he keenly felt the feeling of the head of Bakugou’s cock slide into place, piercing him.
“Ah- Katsuki“ Shinsou cried out, and the feeling of dark, cool water rushing in his head that he’d come to associate with his own quirk use took him by surprise. Above him, Bakugou had stilled.

Shit, he’d lost control of his quirk and activated it by accident. 

He dropped the control as soon as he realized and tried to squirm and see Bakugou’s face. He whined a bit as Bakugou slid out of him. Katsuki’s face was an odd sort of blank and he blinked a couple times.

“Kats?” He asked, reaching up and cupping his cheek in one hand. This seemed to stir something in him and Bakugou’s head turned to face him.

“Omega.” His voice was deeper than usual, and it sent a shiver down his spine. Shinsou took one look at the tiny pupils of his eyes and knew immediately his two seconds of mind control had dragged Bakugou’s alpha instincts closer to the surface once more.

“Oh boy. Hey there, big boy.” Shinsou said with a small smile. “Sorry. Didn’t mean to do that.”

“Omega want knot?” God, the puppy-dog eyes. They were brutal.

“No- well, yeah. But trying to figure out what I just did.”

“Omega calmed alpha man down. Alpha here to take care of omega.”

“Bakugou’s just kinda chilling in there?”

“Mhm.” The alpha nuzzled at Shinsou’s scent glands and he became distinctly aware that he was still very much wanting another knotting.

“He’s ok?”

“Mhm. Alpha’s gonna take care of you. He knows that. He knows Alpha can make you just as happy. Alpha wants to make you feel just as good.”

A lightbulb went off in his head. “You want to take care of me? Make me feel really good? Make me feel really happy? Do you trust me? Does he trust me?”

“Of course.” The response was instantaneous.

“Then be a good boy and roll over for me, darling.” Shinsou purred, and it was almost comical how quickly the alpha rolled over on to his back. “That’s a good alpha.”
The grin on Bakugou’s face was adorable, eyes bright and so so eager to please. “I’m good, good for my omega. Only for my omega. I’ll make you feel so good, just tell me what you want from me.”

“I want you to lie there and let me do this.” Shinsou purred, stroking the hard cock between Bakugou’s thighs as he swung his leg across the alpha to straddle his legs. “You have a very pretty cock, Bakugou. It’s objectively quite nice looking.” The alpha looked like he’d been given ten million yen, a happy chuff falling free from his lips. “And it’s all mine. All of this, it’s all mine.” He reached a hand down, past the half-inflated knot, and ran his fingers along Bakugou’s large sac. His balls, despite Shinsou doing his damnest to drain them, were still swollen with rut and hormones and they rolled heavy between his fingers. Both were too much for him to hold in one hand so he entertained himself with watching Bakugou’s face as he fondled them.

“All yours! You’re my omega, I am all yours. I am the best, and I am for you.” The alpha nodded adamantly. “Do anything to make you happy.”

“You make me very happy. Every last inch of you. But I’m going to focus on, ah, these eleven inches right here.” He gripped Bakugou’s knot firmly and the alpha let out a delicious whine. “You’re going to be a good boy and stay nice and still and you’re going to watch me as I fuck myself on you, okay?”

“Okay!” The alpha complied, holding on to the sheets as Shinsou guided the tip of the cock to his aching entrance and eased himself down on it.

“Ah, fuck- shit, feels… feels so good.” He breathed out, the breath in his lungs knocked out as he sank down halfway onto the cock. “Fuck, I don’t know how I’ve been fitting this whole thing in me these past few days-“

“Omega was made perfectly to take me. We fit well together.” His alpha reassured him, almost reaching up to hold him but remembering he was supposed to just be watching. The wandering hand fell back to his side. “Just take it slow, we are perfect.”

Shinsou felt his cheeks flush as he sank down another inch, rocking slightly. The knot was what remained, and it was half-inflated and a decent size. “Shit. You make me feel so good. So big-“

“Omega so tight, still perfect size after all this time. Meant for alpha. Alpha’s cock perfect for omega. Fill omega up full, make omega happy, make strong pups.” The alpha purred and with one more muffled strain of curse-words, Shinsou sank down completely onto the full length of Katsuki’s cock.

“Mmm, so full. Can feel all of you, even all the way up into my stomach.” Shinsou sighed, letting his tired body rest for a moment as he adjusted to the length inside him. Every little movement he made had the knot brushing up against that special spot that felt like sparks running up his spine. “So big. Good job, alpha. You’re being perfect.” He braced himself, supporting most of his weight on his legs and splaying his hands over Bakugou’s sweaty chest. He made a note to grope his pecs later, but for now he was fully intent on using the alpha like his own personal dildo.

“Ah, ah-“ he inhaled, breath hitching as he started to ride up and down, up and down, letting the cock come halfway out of him before pushing it back inside, watching with pride as the alpha stared, eyes locked on the massive cock passing smoothly into and out of him. “Yes, watch me. You’re mine, all mine, look at how I’m using you- such a good alpha, letting his omega fuck him.” Shinsou started to speed up slowly, his hips rocking slightly as he tried to get the best angle. “Now be a good boy and let Bakugou come back, okay?”

He watched as Bakugou’s pupils expanded back to their normal size, his body tensing up briefly before his head fell back, cursing as Shinsou sank back down onto his swelling knot.

“You little vixen, you have him wrapped around your- ah- your finger-“ Katsuki growled, hands immediately coming up to grip Shinsou’s hips in a grip that was almost bruising.

“Mmm, looks like I’ve got you wrapped around my finger too.” Shinsou purred, almost pulling off of him entirely before slamming back down.

“I’ve got you wrapped around my cock.”

“That you do, alpha, but I’m the one in control here.” Shinsou reached behind him with one hand and gripped Katsuki’s balls in his hand. The alpha inhaled sharply. “Watch me, alpha. Watch as I make myself come on your cock.” He let go of the alpha, focusing all his energy on coaxing that knot to catch. “I think you secretly like this. Like watching your omega be strong and take control. I think you’re getting off to this in record time- ah, fuck-“ he dropped down and the knot almost caught, pulling at his entrance with a delicious stretch. “Oh, Kats, I love it-“ he purred, hips stuttering and legs shaking as he drew himself up for one final time. He let himself fall with a cry as Bakugou’s nails dug in to the soft skin of his hips, drawing blood, as the knot finally caught. Stars flew in front of his eyes as he came, Katsuki’s name a sigh on his lips and his cock spilling on to his alpha’s stomach.

When his vision cleared, he met the gaze of Bakugou with a shaky grin. “Told you you should have let me go on top.”

“I… am now hereby convinced.” Katsuki breathed, tracing the dip of his hips and the curve of his ass with what felt and looked like pure reverence. “That… that was the best view I’ve ever had. You looked so good, like a dream, above me like that. Pretty sure I died for a second their. You pried my soul out of my dick.”

“Mm, guess I better give you the kiss of life then.” Shinsou said with a smirk, leaning down and pressing a kiss to Bakugou’s lips. “Sorry about the quirk accident. I didn’t mean to activate it.”

“Hah, it’s fine. Was hot.” That had Shinsou’s eyes, which were starting to drift closed, snapping open in surprise.

“What?”

“Yeah, man, watching you take control like that? You look very good on top of me. I thought I’d be all snappish and determined to keep control but, uh, seems like my alpha instincts are much more inclined toward keeping you happy. Which is fine by me.”

“There’s nothing about you that’s typical, Bakugou Katsuki. Even your instincts.”

“My instincts are great.”

“Yes they are.” Shinsou rested his head on Bakugou’s chest, relaxing and listening to the steady thrum of the heart beating beneath his ribs. It was a soothing sound. “Thank you for spending my heat with me.”

“I should be the one thanking you. And apologizing for not getting my head out of my ass sooner and courting you in a proper way. But you better believe once we’re out of here I’m gonna court your ass so hard it makes everyone jealous.”

“I was being silly too. But very well, do your best to court me. Make all those extras wish they were us.”

They were both quiet for a long while, simply enjoying the silence as they waited out the knot. In the next few days they’d have to clean up and get the schoolwork they’d missed; there were late night study sessions together in their future. But for now they could just be in each others presence, bodies in sync and minds at ease. The future would bring challenges, yes, but from now on they’d face them together. Villains, classmates, rumors, society- they’d tackle them all.

“You mean the world to me.” Shinsou told Bakguou softly, as he started to drift off to sleep. “Thank you for being mine.”

“You’re the only one for me. I’ll find the words to tell you how I feel some day.” Bakugou replied, with a soft sigh. They were young, still figuring themselves out, and figuring out their world. But a promise was a promise, and that was enough.

Fin.

And that's the end!

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