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Chapter Text

When Ryousuke made him feel unwelcome after his arrival at Seidou, Haruichi hadn’t spoken to him about their shared secondary schooling much, as Ryousuke had spent the winter holidays training at school. They had had no chance to discuss Haruichi’s excitement about attending the same high school, Seidou, much to Haruichi’s disappointment. The last time Haruichi had even seen his older sibling at all had been during Golden Week, when Ryousuke had seemed disinterested in him and had spent his entire time visiting their home reading at the library and working on his assignments there. They hadn’t even played baseball together. Haruichi had looked forward to Ryousuke’s return with great excitement, only to feel lonelier when Ryousuke was close by than when his brother was away at high school.

Haruichi longed for nothing more than to be close to his brother, not that they ever had been as close as he would have liked, as Ryousuke seemed to become more distant after he became a leader, an alpha, and after he began high school. He told Haruichi to be self-sufficient now that they were in different worlds and told Haruichi to work hard to become a strong alpha, too. Haruichi took that advice dutifully, but he felt the lack of Ryousuke’s protective older presence and his lack of guidance so strongly that it was like physical pain for him, digging into his skin and tearing at it.

Haruichi did strive to be a strong alpha like his brother and trained hard at baseball, ready to take on the world with Ryousuke at his side. He yearned for his first rut, but by the time he arrived at Seidou, it looked like he was destined to be an ordinary beta. He would never win Ryousuke’s respect that way, and it absolutely destroyed him inside. 

After Ryousuke spoke derisively to him in front of the vending machines at night, shortly after Haruichi arrived, Haruichi was determined to get Ryousuke alone again. So, he made special missions to Ryousuke’s room to present him with tokens of appreciation for his brother, gifts of respect, thoughtful gestures, and the like. His brother accepted the items and, eventually, Ryousuke tolerated his visits…just barely. Haruichi also had to endure many guidance and older sibling lectures from Ryousuke on life at Seidou, Haruichi’s life as a beta, and how to live an upstanding existence. Sometimes Haruichi wanted to answer back when Ryousuke was judgmental or tough on him, but he learned to just take it for any chance to be with his brother.

Ryousuke wasn’t fond of Haruichi’s roommate, Ono. He began to want Haruichi to spend less time with others and spend his free time in his and Kijima’s room. Kijima didn’t mind Haruichi coming by often, Haruichi was overjoyed with the demand, and so the Kominato brothers’ codependent, formal, familiar arrangement of sorts began. Everything seemed ordered, predictable, and their social hierarchy of senpai, kouhai, alpha, beta, younger, and older brother seemed sorted out. That is, until Haruichi had a late first heat.

The day that Haruichi’s life changed, he had just taken a hot bath with Sawamura and Furuya after practicing their swings late at night. As he headed back to the dorms, he slumped against the wall due to a dizzy spell. 

“Must have stayed in the water too long,” he mumbled, but found he couldn’t stand up straight. 

Sawamura worried about his health and felt his forehead.

“Harucchi, you’re burning up!”

“Yeah, you look like…” Furuya said, before his eyes widened. “Sawamura…Heat scent! Can you help Haruichi from here? It’s best that I leave right now.”

Haruichi looked up to see that Furuya was admiring him in a new light, eyes looking him up and down, and that was not what he wanted at all. 

“NO!” he cried out. “Furuya, I’m not an omega!”

He tried to right himself, but slipped and ended up in Sawamura’s arms.

“Yeah, even I can smell it, Harucchi. Furuya, can you tell Rei what’s happened? I’ll get him to the omega dorms,” Sawamura said as he lifted Haruichi’s arm over his shoulder. “C’mon, you can stay in my room.”

Haruichi despaired as Sawamura helped him to the more private, omega dorms behind the cafeteria, where omega students had the privacy to endure their heats alone. While having his own bedroom was appealing, all Haruichi could think of was that Ryousuke would hate him even more if he were a lowly omega! 

“Eijun,” he whispered, “Are you happy with your gender?”

Sawamura smiled brightly. “Harucchi, are you nervous about it? Being an omega is a wonderful gift. I’m sure you’ll be very happy, just as I am with Miyuki. I’ll go stay in his room and let you spend your heat in my place until we get your things moved into a room near me. We can be omega-buddies!”

Haruichi had to smile slightly at that. He could always count on Sawamura to say the right thing and to make him feel better when he was down. Sawamura settled him in the wider, omega bed, gave him a few knotting toys, swore they were clean, and warned Haruichi not to break them, then grabbed a few clothes and slipped out to give Haruichi some privacy. 

After Sawamura left, and as Haruichi felt the increasing need for a knot and an alpha that he had never experienced before, he eyed the toys, indulged in them, and then knew, without a doubt, that he was 100% full-bred omega.

Chapter Text

Ryousuke was studying when Kuramochi knocked on his door with several loud thumps. 

“Ryou-san! Congratulations!” he said as he peeked in through the entrance. “Haruichi’s having his first heat! You have an omega brother!”

Ryousuke dropped his pen and turned to Kuramochi with a stern expression.

“What, am I his parent? So what if he’s in heat?”

“Oh,” Kuramochi replied, “I just thought it was exciting!”

Ryousuke did think it was exciting—it was hella exciting—but he wouldn’t let anyone know that he felt that.

“I take it someone’s looking after him,” he said instead. “I’ll talk to Rei and make sure they settle him in properly in the right room. Thank you for telling me, Mochi.”

When Kuramochi had left and Kijima had gone to sleep, Ryousuke lay in bed, gazing out the chinks in the curtains at the full moon. What an auspicious time for Haruichi’s first heat. Ryousuke had been worried when Haruichi hadn’t presented as anything in middle school. While publicly, he had always voiced the desire for Haruichi to be an alpha like himself, privately, he had one thought only: he desired Haruichi, whatever his gender presentation turned out to be. If Haruichi were an alpha, Ryousuke would bitch him. If Haruichi were to simply be a beta, Ryousuke would be a little disappointed…But Haruichi presenting as an omega was a fantasy that Ryousuke had long since given up on, since omegas usually presented in early middle school. 

Ryousuke spent the week of Haruichi’s first heat using incredible self-control not to sneak into Sawamura’s quarters to see how Haruichi was faring, what his scent was like, what the innocence and sweetness of his first heat might be like. He knew that Haruichi had an unhealthy obsession with him and had done so since they were young, but he couldn’t confirm whether Haruichi felt the same way about brothers and incest as Ryousuke did. So, he held himself back. The last thing he wanted was to visit Haruichi to dish out some brotherly advice and make creepy advances on an unwilling sibling…Ryousuke was too proud for that. 

Waiting for the heat to end was excruciating. But the enjoyment Ryousuke got from their first meeting in the cafeteria at breakfast the day after Haruichi’s heat almost made up for it. When he arrived in the common area to order his breakfast, Haruichi, Sawamura, and Furuya lined up behind him.

“Hellooo, Haru-chan,” Ryousuke said, using Haruichi’s childhood nickname to tease him.

“A-aniki. Good morning.” 

“How are you feeling?” Ryousuke asked.

“I-I…I’m as to be expected…” Haruichi said with his eyes downcast.

“What’s your order?” the cafeteria lady asked them.

“Mackerel,” Ryousuke said. 

“Pancakes with syrup,” Haruichi replied to her.

“I see being an omega has already changed your taste buds,” Ryousuke sneered.

Haruichi blushed as bright as his hair. 

“I-I wanted to be an alpha like you, Aniki! I’m sorry…” 

“We can’t all be alphas. Work hard or they’ll drop you from the team,” Ryousuke said as he accepted his breakfast, nodded curtly at his brother, then walked over to eat with the other third years.

Haruichi sighed sadly at his retreating back. Ryousuke did feel a little mean for what he had just said, but he had to raise Haruichi right, and it was true that omegas sometimes couldn’t hack it on the field. He had had to warn the younger Kominato about that, and he would visit Haruichi in the future and train him carefully to make sure that he didn’t fall behind in baseball. 

That afternoon, Ryousuke took his bath with the other alphas and some of the betas in the communal baths, and he looked for Haruichi out of habit to scrub his back, then remembered that Haruichi would now be bathing with other omegas. For some reason, the idea that Haruichi bathed with others other than himself made his blood run cold. Omegas and omegas often dated each other these days…What would Haruichi be able to get up to now that he wasn’t under his strict older brother’s ever-watchful gaze? His hand gripped his wash bucket so hard his knuckles turned white, until he remembered that Haruichi was quite obsessed with pleasing him and always had been. All he had to do was drop some hints about his concerns about the omegas in the dorms, and all would be fine. 

He started by sending Haruichi a text.

Ryousuke: How are you settling into the omega dorms, Haru-chan?

Haruichi: You haven’t called me Haru-chan in ages.

Ryousuke: You’re an omega. It suits you more than ever now.

Haruichi: If you say so, Aniki. The dorms are nice! Sawamura is showing me around.

Ryousuke: I’ll be coming around every day to keep you in shape so you can stay on the team. You don’t want to get soft just because you’re an omega.

Haruichi: Oh, thank you, Aniki! It means a lot to have your help!

Ryousuke: Don’t be so sentimental! See you tomorrow at 5. And don’t let the omegas make you weak—limit your time with them.

Haruichi: ? Of course, Aniki. 

Ryousuke sighed as he put down his phone. He thought of Haruichi’s body, and how his brother would train hard, but surely he’d still have soft, smooth, omega skin, and he’d leak slick during his heats. Kijima wasn’t around, so Ryousuke slipped his hand into his sweatpants and stroked himself, moaning quietly as he imagined Haruichi’s sweet, sweet submission…Ryousuke received his brother’s innocent respect in subtle ways during daily life, but what would Haruichi be like in bed? He dared to stroke himself to climax, considering all the possibilities, and came with a suppressed shout and a climax so hard that he felt utterly spent before dropping on the bed in defeat. There was no way that situation—intimacy with his sweet baby brother—would ever happen!

The next day, when he met Haruichi, he explained to him that he was going to start scenting him to protect him from unwanted advances from alphas on the baseball team. 

“Haru-chan, save yourself for the right alpha, okay?” he said as he rubbed the glands at their necks together.

Haruichi blushed brightly. “I would never sleep around, Aniki!” 

“Good. Don’t let Sawamura and Miyuki influence you with their slutty corruption.” 

“Of course! I don’t want a boyfriend. Not at all!!!” 

“Oh? Uh, that’s good. Good boy.”

Ryousuke was slightly surprised that Haruichi was so sensible, and secretly pleased as well.

Chapter Text

Haruichi found great fulfillment from his extra training sessions with his brother. He felt protected, cared for, and he enjoyed being scented as Ryousuke’s brotherly pheromones were comforting to him, as he had been the main protector that Haruichi had had all his life. However, by the time of the second heat, Haruichi’s feelings had changed in subtle ways. 

He had grown so used to Ryousuke’s scent on his body that he found himself thinking about him at the strangest of times—when excited, stressed, and even motivated…the way that Ryousuke’s pheromones evaporated off Haruichi’s own skin had delightful fragrance notes that suddenly took on new meaning during Haruichi’s second pre-heat. As he trained with Ryousuke after dinner and felt the first early cramps in his belly, he noticed Ryousuke eyeing him closely, and Haruichi realized that he yearned for more of that attention. Ryousuke scented him as usual, but even before Ryousuke had walked out of sight, Haruichi knew that something had irrefutably changed in his psyche when it came to Ryousuke’s nurturing behaviors.

He moved to his dorm room and texted Rei to say that he thought he might be in heat again. Then he bathed in the omega bathhouse because he knew he’d be sweating and overheating if it was like the first one. Even in the ofuro tub, he felt hot, so he stood under a coolish shower until he felt soothed enough to head to his room. He was so distracted by the changes in his hazy mind, thinking alpha, need, wishful, that he forgot to text his brother not to come visit him to study later. As he lay on top of the sheets of his bed weakly, he wished he could melt into the bed and not feel the heaviness and pain in his stomach. 

As Haruichi napped, he woke up to a weight against his back. He immediately recognized Ryousuke’s comforting presence.

“A…niki…” he whispered, “Sorry I can’t study tonight…Heat…”

As he became more alert and more awake, he noticed a mouthwatering smell in the room. It smelled like home, it smelled like Alpha.

“Aniki?!” he said. “Who’s here?” 

“It’s just me, Haru-chan,” Ryousuke replied.

“B-but I smell…”

Ryousuke rolled him onto his back to stare down at him. 

“What do you smell?” he asked.

Haruichi smiled weakly. “Aniki, you’re here. I’m so happy…”

“Yes, I’m here. When did your heat start?” 

“Just after you left. I forgot to tell you…”

“Have you seen anyone else?”

“No.” 

“Good.” 

Haruichi shivered with a strange delight at the finality of Ryousuke’s tone. Had he done something Ryousuke liked?

“What do you feel inside?” Ryousuke asked.

“Pain,” Haruichi replied. “My stomach.”

“How do you relieve it?”  

Haruichi blushed. He curled in on himself and looked away in shame because he wished he were an alpha like his brother. He tried to look away, but Ryousuke held him down to the bed by his wrists.

“Don’t run away,” he said quietly. “Why are you doing that?” 

“Aniki, I wanted to be like you.”

“But you’re not. You’re something special. You’re an omega.”

Haruichi froze. “Special?” 

Ryousuke splayed his palm possessively over Haruichi’s stomach. “Yes. Show me how you relieve heat.” 

Haruichi wasn’t really sure what to do; anything that he did for that was related to sex and fertility. And not illustrious or respectable or ‘alpha.’

“Aniki, I—“

“I want to know if my little Haru-chan knows what to do,” Ryousuke said, allowing no room for argument. 

“Y-yes, Aniki,” Haruichi said as he reached under his bed for the standard box of toys the room had come with for omega students.

His hands trembled as he opened the box due to his deep shame over being an omega. He found it hard to breathe or even meet Ryousuke’s eyes as he laid out the knotting dildo and other smaller dildos that could be used in earlier stages of heat. As he felt his cheeks redden, he looked away to avoid Ryousuke’s reaction. He was highly aware of his brother due to embarrassment, but also due to new feelings of bizarre, magnetic attraction to him. 

After a few minutes of pregnant silence, Ryousuke finally spoke.

“Have you used these yet, Haru-chan?” 

Haruichi shook his head. “No. My heat just began after you left.” 

“What do you desire when you use them?” 

Haruichi panicked. “I…”

“Go on, tell me.”

“I want an alpha,” Haruichi said in a small voice. “I want to be close to one.”

“Good boy,” Ryousuke said. 

Haruichi felt confused, but he preened anyway that he had received praise. He dared to look up and blinked with surprise as he saw Ryousuke admiring him in his plain, soft, worn pajamas that he had chosen to wear because they were the coolest clothing he had in his cupboard. They were almost threadbare in places, and he remained still as Ryousuke reached out and stroked the thin fabric.

“Haru-chan, what type of alpha do you want?” 

Haruichi could feel the heat of Ryousuke’s palm on his thigh, even through the fabric. It felt as though it burned his skin with electric pulses. He had never felt such raw desire for anything or anyone before. Was he supposed to react to a sibling this way? His eyebrows knit together as he felt the burden of his errant feelings.

“What’s wrong, Haruichi?” Ryousuke asked. 

“I feel confused, Aniki,” he said. “Your scent confuses me, and…OW!” 

Haruichi hunched over to clutch his stomach and whined in pain.

“Poor Haru-chan, let your older brother help,” Ryousuke said as he packed the dildos back in the box and slid it back under the bed. 

He lifted the sheets, twisted and rolled them, and created a little makeshift nest for Haruichi, then laid the omega inside it and stroked his sweat-dampened, slightly darkened, wet pink hair. 

“How did you know how to do that, Aniki?” Haruichi asked.

“When you didn’t present as an alpha at the usual age, Haru-chan, I studied up in case you became an omega.”

“Did you w-want…me to be an omega?” Haruichi asked with wide eyes.

“Well…I certainly didn’t want a beta for a brother,” Ryousuke said as he coughed and looked away.

It was then, for the first time, that Haruichi realized that the new glint in Ryousuke’s eyes that he had mistaken for judgment and critical stares at his weakness as an omega might actually be desire…

“A-anyway,” Ryousuke said as he sat beside Haruichi’s nest, “Let me fetch some cooling patches and soup. Have you told Rei you have a heat?” 

“Yes, Aniki.” 

“Good. I’ll be back shortly. DON’T let anyone else in.” 

Haruichi watched as Ryousuke ducked out, glancing back hesitantly as he closed the door. When he was sure he was alone, Haruichi immediately got on his phone to Google sibling relationships and heats. He discovered that sometimes siblings formed a bond…learned that it wasn’t impossible to occur…and that it couldn’t be helped. That was all he needed to know! He was now hell-bent on seducing the alpha whose scent enticed him the most: his cherished brother Ryousuke.

Chapter Text

Ryousuke shut the door to Haruichi’s room and leaned back against it, and heaved deep, shaky breaths from the strain of controlling himself. Haruichi had only been in preheat so far, and his scent had been weak…Even so, Ryousuke had also been carefully breathing through his mouth. But oh, how heavenly had Haruichi smelled on the accidental chances Ryousuke had caught a whiff of it—it had been dramatically better than Ryousuke could have expected! He knew he shouldn’t return to Haruichi’s room to look after him, but his entire being was drawn to his baby brother. He hurriedly gathered some medical supplies and cup noodles, instant soups, and chocolate for Haruichi, then returned to the omega dorms, making sure that no one saw him.

When he opened Haruichi’s door, the heat fragrance was thicker in the air. As he locked the door behind him, he noticed that the lighting was softer, as Haruichi had dimmed the lights to only the glow from his desk lamp. Ryousuke felt taken in by the softer environment and searched eagerly for the source of the erotic scent that was his young follower. When he found Haruichi, the younger second baseman was sweating with his pajama shirt half unbuttoned, as he wiped his sweat-dampened skin dry. Ryousuke could feel his pulse beating wildly at that glimpse of Haruichi’s bare skin. He wanted to kiss it better, he wanted to lick it, he wanted to suck marks, rake his nails, and graze his teeth over it. 

“Aniki?” Haruichi murmured with rosy cheeks as he wiped his face and damp neck, “I’m glad you’re back.” 

“I brought you some food, Haru-chan,” Ryousuke said as he set the soup and chocolate down on the desk.

He approached the bed carefully, taking slow, deliberate steps to try and control his desire to pounce on the cute little omega in front of him. It took a supreme effort not to pin Haruichi down and slip his hands into the opening of his pajama shirt to feel Haruichi’s hot skin, to see how far along his heat was. From his fragrance, Haruichi was still in late preheat, but how was Ryousuke to know? He hadn’t spent a heat with an omega—he was still in high school. For all his desires, Ryousuke had only had sexual experience with omegas in other parts of their cycle. All he had was his research for when he had hoped that Haruichi would present as an omega all those years ago. How fortuitous that Haruichi had presented when Ryousuke could be near him. And heavens, how Haruichi’s scent drove him wild! 

He decided to sit at the edge of Haruichi’s nest and play it cool because he felt like an untameable wild animal that would lose its mind if he were too close to Haruichi. He got out his phone and pretended to research advice for omegas in heat that he already knew by heart.

“For an omega to experience less pain during a heat, they must put off their first knot. When I leave, Haru-chan, leave the, ahem, knotting toy aside for as long as you can.” 

“Aniki…” Haruichi said as he crawled closer to Ryousuke in the nest, “Won’t you come in here and show me your phone? I can’t see that diagram.” 

Ryousuke felt a cold sweat of nerves as he felt the irresistible pull to climb into his Omega’s nest. As he climbed in, he wondered when Haruichi had become HIS OMEGA? This was a bit of an unexpected mental assumption he had not planned for. He trembled with desire and caught himself getting carried away, stopped, and took a deep breath, then set his phone down on the bed between them so that Haruichi could view an X-ray medical diagram of an omega uterus, an anal passage, and an alpha cock lodged inside.

“Oh, Aniki,” Haruichi said shyly, “this isn’t a toy.” 

Ryousuke swallowed nervously. “No, it’s not.” 

“Aniki, so how did Sawamura and Miyuki…”

“Haru-chan!” Ryousuke admonished, “Surely, you’re not thinking of finding an alpha at Seidou?!” 

Haruichi looked up defiantly at Ryousuke, which was so rare, Ryousuke had no idea what to do as Haruichi leaned forward and said very clearly, “I do want one.” 

There was a brief silence where the two Kominatos sized each other up before Ryousuke shook his head decisively, knocked Haruichi flat onto his back, and pinned him down in the soft, neat nest that Haruichi had clearly worked on while Ryousuke had left. 

“Haru-chan…” Ryousuke warned, “Do you think the team would want my younger sibling to ‘get around’ Seidou like that? Is that the Kominato way to behave?” 

“Aniki, what if I only want one alpha?” 

One alpha was one alpha too many, Ryousuke thought to himself with despair. 

“Haru-chan, what about pregnancy?” 

“Sawamura got me set up on the pill with the school nurse.”

Curse Sawamura! Ryousuke racked his brain for counterarguments to Haruichi finding a partner. 

“Haru-chan…There aren’t any alphas of the caliber you deserve. I can’t think of anyone on the team that I could approve of as your partner.” 

“I can think of one…” Haruichi said. 

Ryousuke was struggling to keep his rut at bay; he was trembling so much that Haruichi probably noticed it, and even he could sense the distressed scent coming from himself. 

“HARU—“ he gritted out as he decided to outright deny Haruichi any dating rights until he had graduated from college, when he was completely taken by surprise as Haruichi leaned up from his trapped position to kiss him daringly on the lips.

Chapter Text

Haruichi blinked as he felt the warmth of his older brother’s lips from their one-sided kiss. He couldn’t believe his own bravery to even dare to kiss Ryou, but he was a Kominato as well, and they were built of stern stuff. When Haruichi was on the baseball field, he was known as a formidable player despite his shyness, and even that was slipping away as his confidence at Seidou improved. But…he had just crossed a very taboo line with Ryousuke, and he instantly regretted it when Ryousuke didn’t react to him at all.

“S-sorry…” Haruichi murmured after a drawn-out silence as he tried to turn his face away in shame. 

“Who said you could look away?” Ryousuke said quietly. “Would you really do something like that and then take it back, Haru-chan?”

“Huh?” Haruichi said as he looked up into Ryousuke’s eyes that were craftily watching him, rose-colored, like his own.

“Do you want to practice with me for that alpha? Is that it?” Ryousuke asked.

Haruichi cried out as though in pain. 

“No! Aniki! The alpha I want is YOU!” 

Ryousuke let go of Haruichi’s wrists and sat cross-legged and with his arms folded, tetchily seated in Haruichi’s nest with a frown. “Somehow, you spoiled brat, I don’t believe you.” 

Haruichi scrambled to his knees and whined anxiously, in omega distress. “Aniki, I mean it. I want you for this heat!” 

“Only for this heat? So you are using me as practice.” 

Haruichi screwed his eyes shut in frustration—he didn’t mean just this heat, he had been treading softly. The fleeting touch of Ryousuke’s lips had sent electrical impulses through his nervous system that he was sure weren’t just from his heightened heat senses. Haruichi felt, in that moment, that Ryousuke was the only alpha for him. Suddenly, his whole life following his brother and seeking his attention and approval made sense—he didn’t want Ryousuke to acknowledge him….he wanted Ryousuke in other, murkier, romantic ways. And with the green light from Google AI (which he hoped was accurate information), he now would go to the ends of the earth to make Ryousuke his. But where would he start? How would he pull Ryousuke to the dark side of brother-love?

He decided to up the level of seduction to the best of his ability. If his romantic gesture was not working, he would use his body to tempt his brother. But as he fretted about how to appeal to Ryousuke’s desires, his brother sighed in exasperation. 

“Haru-chan, I can see you want this very much. As your older brother, I’m happy to guide you. But I get the final decision on whether he’s right for you. You WILL NOT touch others without my permission. Do you understand?” 

“Yes, Aniki,” Haruichi said quickly, and lowered his eyes in deference.

“Good omega,” Ryousuke said, which had Haruichi preening internally at the praise. 

“Alright, Aniki, how do please y— er, I mean, a generic alpha?” 

Ryousuke thought about that for a moment, and then gave Haruichi a slow and considered once over, his eyes drinking in Haruichi in his threadbare pajamas in a lustful, heated stare. 

“Haru-chan, you let the alpha lead. I’m going to kiss you, and I’m going to prepare you for your heat to be satisfied. Alphas are also responsible for satisfying the omega, and I will make sure that you are ready, sated, and begging for a knot.”

“H-have you done this before, Aniki?” Haruichi asked in awe. 

“Yes,” Ryousuke said quickly. “Trust your Aniki.” 

Haruichi watched in wonder as Ryousuke crossed his nest to rest him gently on his back and pause above him with their lips almost touching. Haruichi could feel Ryousuke’s breath on his face as Ryousuke said, “You sure you want to go through with this?” 

“YES!!!” Haruichi replied decisively, and then…he was kissed. 

When Ryousuke kissed him, Haruichi felt the soft press of lips, then another kiss, another gentle, more assertive one, and then they were tumbling over each other in the sheets, mouths seeking each other hungrily, mouths meeting in a dance that felt as if they were made to kiss like this always. Haruichi couldn’t believe how dizzy with delight the kisses made him feel, and how much his desire for his brother felt as if it were being released, freed, allowed the space to exist how it should. He knew Ryousuke was training him, but it felt as if Ryousuke didn’t mind that Haruichi was his partner.

“Aniki,” Haruichi said as they paused to catch their breath, “I’ve never been kissed. It’s very nice.” 

“It is nice. Now open your mouth slightly.” 

Haruchi did as requested and moaned meekly as Ryousuke slipped his tongue inside. Haruichi found it strangely erotic and quickly learned to curl his tongue against his brother’s, to suck on it, and to luxuriate in its silky feel. But as he got excited by all the French kisses and the passion rising in their union, he felt his cock harden between their bodies and panicked.

“A-Aniki…! I—“ 

“Mmm!” Ryousuke groaned as he noticed it. 

He slipped a hand between them and traced his finger down the length of it, drawing dramatic shivers from Haruichi. 

“What’s this, Haru-chan?” Ryousuke said slyly. 

“AHH!” Haruichi said as he hid his face with his hands. “Don’t look, Aniki!” 

He was so embarrassed that he wanted to disappear. But when he removed his hands from his face, Ryousuke had straddled his body with his crotch close, and Haruichi could see that Ryousuke was now hard too. 

“It’s time you learned how to show your alpha that you want him, Haru-chan,” Ryousuke said softly. 

Haruichi felt so excited about the chance to please Ryousuke that he felt faint as all the blood in his body rushed straight to his dick. 

Chapter Text

He had wanted to go slow…He had wanted to seduce Haruichi like the precious virgin that he was, but Haruichi’s heat scent had him rutting and barely in control of himself. As he pulled his thick cock out and tapped it on Haruichi’s lips, then smeared the precum on them for Haruichi to eagerly taste it, he thought that Haruichi might be a quick study anyway. As he realized the angle of fellation might be tough for a beginner, he climbed off his brother and smirked at the quiet whine from the omega as he sat opposite him. 

“Come here, Haru-chan,” Ryousuke said as he patted his thigh. “This way is easier for you.” 

Haruichi broke out into what Ryousuke thought was such an adorable smile that his heartbeat sped up, and he thought that Haruichi was completely unaware of what a desirable omega he was. Ryousuke had seen Furuya, Kuramochi, and a few other teammates checking his brother out now that he was ‘available’, and he felt pangs of jealousy that made his rut sharpen. As Haruichi crawled across the bed on all fours and stopped to kneel in front of the alpha, Ryousuke gripped him by the chin and led him down to his lap.

“Show me that you want me,” he said.

“Yes, Aniki,” Haruichi whispered.

Ryousuke watched with interest as Haruichi kissed the tip of his cock reverentially, with great respect and admiration, and he was mesmerized as Haruichi fit the tip inside his cute, neat mouth and sucked lightly. The desire Ryousuke felt as Haruichi began taking him in slowly, inch by inch, in worship and with great care, was so all-encompassing that the older Kominato couldn’t hold back the praise and filth that fell from his lips as he gripped Haruichi by the hair and thrust, as gently as he could, in Haruichi’s pliant, wet mouth. 

“Sooo good, Haru-chan. What an obedient little omega. You’re meant to take my dick, aren’t you? Take it all in, deeper and deeper. Get ready for it, I’m going to fill your belly with my cum.” 

“Mmph!” Haruichi agreed as Ryousuke thrust harder, nearing his peak with every stroke and every tap against the back of Haruichi’s throat. 

As he stopped for a moment to catch himself and enjoy the experience a little longer, he looked down and stroked Haruichi’s cheek gently. 

“I’ve always wanted you to do this, Haru-chan,” he said in a moment of tenderness. “You’re such a good boy…” 

Haruichi’s rose colored eyes widened, and Ryousuke was surprised when the omega began to purr. Purring was a very rare occurrence, a sign that one’s Omega was pleased with you, and that they felt wholly safe and bonded to you. But that aside, the vibrations of Haruichi’s throat were so erotic that Ryousuke gasped and pulled Haruichi closer onto his cock with a shout as he came unexpectedly, with such great pleasure, and with such satisfaction that his eyes gently shut, his head fell back, and his only thought was of his brother and how perfect he was. He shot deep into Haruichi’s mouth as he felt bliss and peace follow the initial peak.

“Ohhh fuck…” he whispered as he came back to himself. 

He looked down to see that Haruichi had swallowed as much as he could and was dutifully cleaning Ryousuke’s softening cock with his tongue. Ryousuke bonelessly drew Haruichi up into his arms and pressed a kiss on the top of Haruichi’s head, then pulled a sheet over them to rest for a short while. 

“Did I please you, Alpha?” Haruichi asked as he drew affectionate caresses and featherlight circles with his fingers on Ryousuke’s forearm, where it lay on top of the sheet. 

Ryousuke, who had been so sated he had almost fallen asleep, shuddered to attention as he was addressed with the formal title. Haruichi had inadvertently called him his partner, his Alpha. It made Ryousuke’s dick hard again, and he came back to the situation at hand, which was the uplifting and deepening scent of his brother’s second heat—it had almost begun, from the thick fragrance that had filled the room. 

“Yes, Haru-chan. I believe in your dedication. But I don’t like the idea of you doing that with others.” 

Ryousuke hoped he could wave away his words and call it a ‘heat thing.’ He just wanted to say how he really felt.

“Er…nevermind…It’s a rut thing…” he said dismissively, which relaxed Haruichi, but the omega also seemed slightly saddened.

“Um, Aniki,” he said as he lay his head on Ryousuke’s heart, “If it means anything, I would never want to be with any alpha other than you because I’ve decided that YOU are my Alpha. Wait—that’s not quite it. Aniki, I know that I’m yours.” 

“Prove it,” Ryousuke said. 

He saw Haruichi’s puzzled look and found it adorable. So adorable that he had to take control of the situation back. 

Chapter Text

Haruichi wondered what Ryousuke intended to do as he was lifted and gently placed on his back in the center of his nest. As Ryousuke climbed above him, Haruichi nearly doubled over in pain; his heat had finally come. 

“A-Aniki!” he gasped. “Owww…A-ah.”

“Mmngh,” Ryousuke groaned as Haruichi released a fresh and fruitful, fertile scent. “OH, you smell divine.” 

“Aniki,” Haruichi said as he wrapped his arms around Ryousuke’s neck, “What about the heat pain?” 

“I’ll tease you, and warm you up, and prepare you for a powerful orgasm that will draw my seed in deep,” Ryousuke explained. “It’ll take some time, but you’ll feel the relief for several hours after that.”

“And then what?” Haruichi asked.

“And then,” Ryousuke said, after kissing the omega on his pouty, pained mouth, “We do it all over again.” 

“Oh, ANIKI! Yes!” Haruichi purred in anticipation, causing Ryousuke’s cock to grow even bigger against his inner thigh as the alpha reacted to Haruichi’s acceptance of him.

Haruichi squeaked as he felt a faint pain tremor in his stomach and arched his back, thrusting his own cock up against Ryousuke’s belly. 

“Mmm, Haru-chan!” Ryousuke groaned as he nuzzled in against Haruichi’s tender neck to suck rosy marks that Haruichi knew meant to claim his ownership and territory so that the other alphas on the team would see it.

Haruichi shivered with delight as he thought about that branding and felt the pleasure-pain of each potential hickie on his neck and collarbone. He gasped as Ryousuke kissed his way down to his chest, roughly shoved up his pajama shirt, and latched onto his left nipple to tongue at it, suckle it, and nibble it delicately with his teeth. As Ryousuke tended to the right nipple, he tugged at the waistband of Haruichi’s threadbare pajama pants. Haruichi lifted his hips to assist Ryousuke as his brother pulled them down to discover that Haruichi wore no boxers underneath. 

“Perfect,” Ryousuke whispered as he wrapped his fist around Haruichi’s cock and stroked it several times to get to know it, commenting how they had the same dick. 

Haruichi giggled at that, then gasped in pleasure as Ryousuke played with the sensitive tip and smeared the precum over it to lube up the shaft. 

“We’re going to make you cum, Haru-chan,” Ryousuke said, his voice smooth like velvet.

Haruichi moaned at the sound of it, and he could have cum right there, except Ryousuke had stopped to lift both his legs to expose his hole to him.

“Aniki!” Haruichi cried in embarrassment, then groaned as Ryousuke greedily mouthed at the slick-soaked sensitive rim, puffed and ready for an alpha. “Anhhh…” Haruichi sighed as Ryousuke licked up all his slick, then massaged the tight muscle with his tongue. “Aniki, in a place like that’s…” 

“Mmm…It’s a place only I can see…” Ryousuke said. 

Haruichi thought to himself that he hoped only Ryousuke would ever see it. He moaned in surprise as Ryousuke gently worked two fingers into him, letting him adjust to the new sensations. 

“Ohh…Ahhhhniki….” Haruchi sighed as Ryousuke thrust slowly, building up Haruichi’s interest, enjoyment, and excitement. Just when Haruichi thought it couldn’t feel any better, Ryousuke reached a place inside him that felt so pleasurable that Haruichi cried out and shuddered underneath his brother. Ryousuke smirked, then reached for Haruichi’s cock and continued teasing himself with dual stimulation until Haruichi was bucking wildly on the bed and unable to feel anything but what excitement Ryousuke could give him. 

“ANIKI! I’ll cum!” He gasped. 

“Go on then, Haru-chan. I want you to.” 

“Oh, Aniki!” Haruichi replied, his heart full, then seconds later, he shot, his cum jetting out so hard it flew past his head and hit the pillow behind him. 

“Heh,” Ryousuke said as he licked some stray cum from his thumb. 

Haruichi lay trembling from the aftershocks and weakly accepted a kiss from Ryousuke on the lips as Ryousuke rested on his elbow beside him. 

“How was that, Omega?” Ryousuke said. 

“D-did you call me ‘Omega,’ Aniki?” 

“Well, you are my Omega, aren’t you? Mine to do with as I please?” 

Haruichi brightened, threw his arms around Ryousuke, and nestled his face against Ryousuke’s scent gland. 

“Don’t be so sentimental…” Ryousuke grumbled, so Haruichi obediently let go, but inside, he was over the moon. 

“Alpha,” he said deferentially, What should I do for you now? What do I do to please you?” 

“I think, when it reaches your mid-heat, Haru-chan, just take it easy and…”

“AGH!” Haruichi gasped in pain.

“See, I told you,” Ryousuke said as he delicately massaged Haruichi’s belly, “pretty soon, you’ll need a knot.” 

Haruichi could barely hear Ryousuke as he felt another cramp, and then all he wanted, craved, and what he needed for his survival was, as his brother and his first heat had taught him, was…a knot. 

Chapter Text

Ryousuke could smell the shift in Haruichi’s scent—his brother was in full-blown heat and ready to knot, but something changed in Haruichi’s expression. 

“What is it, Haru-chan?” Ryousuke said as he could see that now was not the right moment to pounce on the trembling omega. 

And to his distress, he saw tears begin to flow down Haruichi’s cheeks. He quickly smoothed his brother’s thick bangs to the side to expose his eyes. 

“What’s wrong?” he said as he worried that his Omega was about to reject their bond. 

Haruichi’s hands curled up into fists, and he turned away from his brother.

“I…I’m upset. My omega instincts see you as my Alpha. And I don’t mean for just this heat, Aniki. The fact that you’ve fucked other omegas has me dying inside. I…I’m in pain.”

Ryousuke understood this sentiment very well. He wouldn’t have been okay with Haruichi even kissing another alpha. He watched Haruichi’s shoulders shake from behind as the omega silently cried with his back to him and supposed he’d have to come clean. He wrapped his arms around his brother.

“Haru-chan,” he whispered into Haruichi’s hair, “I always wanted you. I may have had other experiences, but my obsession has always been…for one person who’s very close to me. Let’s leave it at that.” 

He gently helped Haruichi out of his old pajama shirt and sucked a few possessive marks between his shoulder blades. As he lay Haruichi down on his side and rutted against the backs of Haruichi’s thighs, Haruichi whispered, “Aniki, when you hoped I was an omega, does that mean I was that person…?” 

“High chance of it,” Ryousuke said lightly. 

He smiled against the back of Haruichi’s neck as Haruichi’s scent sweetened in pleasure. He hadn’t expected his obsession to be requited—because he hadn’t dared to dream—but it was obvious in hindsight that their thing for their own brother went both ways.

“Aniki, will you tell me who you shared a heat with?” 

“Haru-chan…” Ryousuke sighed, “Do you think Sawamura and Miyuki got away with it because everyone else here does?” 

“Hm?” 

“They’re the main battery. It’s allowed because they’re the battery. Do you see others consummating heats in the omega dorms?” 

“N-no…”

“Then who could I have done it with?” 

“What about us?” 

“Sibling bond.” 

“That’s convenient...I’m sure they’ll believe that,” Haruichi said as he rolled his eyes. 

“No, I mean BOND. I’m going to bond you after this. Then we can’t be separated, Haru-chan.”

“ANIKI!” Haruichi said with delight before his eyes shut suddenly. “Urk…!”

He curled in on himself in pain. As he released fragrant, fertile pheromones, and because Ryousuke knew Haruichi was his already, he pinned Haruichi hard against the mattress with their fingers interlaced.

“Haru-chan,” he said quietly, “it’s time I claimed you.” 

Haruichi nodded obediently. “Yes, Alpha.” 

He accepted the chaste kiss from Ryousuke, the promise of both brotherly love and bonding, then shivered as Ryousuke kissed down the side of his neck toward his scent gland at the juncture of his neck and shoulder. As Ryousuke sucked it, he felt Haruichi groan with need.

“One thing at a time. Bond, then knot,” Ryousuke whispered.

“Oh, fuck. Yes, yes, Aniki…” Haruichi replied.

He hissed in pain as Ryousuke bit hard on his gland, and Ryousuke felt alive and more aware of their actions as he tasted the copper of blood in his mouth. He licked the wound to soothe it, then exposed his own gland to Haruichi. 

“Go on, Haruichi.” 

Haruichi took a deep breath, then bit his hardest, piercing Ryousuke’s shoulder with his teeth. 

“F-fuck,” Ryousuke gritted out, wondering how Haruichi had stayed quiet. 

As they kissed the blood from each other’s lips and murmured promises and vows to each other, their excitement rose, and they ground their cocks together as they kissed, slipping and sliding against each other in the perfect fit. By the time of Haruichi’s next heat cramp, they were ready to knot. 

“Haru-chan, you’re my first knot,” Ryousuke said as he lined himself up with his brother’s hole. “I’m happy that it turned out like this.” 

“Me, too, Aniki,” Haruichi said as he shut his eyes and adjusted to Ryousuke’s girth as the older Kominato pushed his way in. 

Ryousuke groaned as he felt Haruichi’s virgin tightness sheathe him, and also felt that additional thrill knowing they were bonded, that they had chosen each other, and that Ryousuke had chosen Haruichi for a long, long time. The reward for the long wait was sweet. He felt a heat tremor squeeze his cock deliciously and began to move, pushing deep into his younger brother as he stroked Haruichi’s cheek and mouthed at Haruichi’s wet lips. 

“Haru-chan,” he whispered, “Now that we’re bonded, I’ll visit you anytime you want.” 

“Aniki!” came the delighted reply.

Haruichi reached up around his neck to pull him in closer and wrapped his ankles around Ryousuke’s hips to pull him in deeper as well. 

“Oh, that’s good,” Ryousuke said as he thrust harder into Haruichi’s center. 

As Haruichi began to feel the buildup and their long foreplay promised a strong relief from hs heat pangs, Ryousuke began to let his rut go free and rammed into his brother, making it known to the omega who his Alpha was. 

“Haru—!” he gasped as Haruichi cried out when he hit his prostate.

 As Haruichi squeezed tighter around him, Ryousuke pounded against that same place to carry Haruichi towards his peak, grunting as Haruichi dug his nails into his shoulders in his ecstasy. The pain from those scrapes had Ryousuke’s alpha instincts rutting harder as he sped up the pace of his strokes, causing Haruichi to scream in delight. 

“ANIKI!!! I’m going to cum!” the omega suddenly whispered as he struggled to breathe.

Ryousuke was almost there, too. 

He reached between them to stroke Haruichi’s cock, and a few seconds later, his knot rose. He groaned as Haruichi reacted by clenching, crying out in release, and splashing his cum between their bodies. Ryousuke’s orgasm was triggered, and he released his potent alpha seed inside his brother and felt the squeezes as Haruichi’s body tried to keep it inside him. That triggered a smaller alpha orgasm, and by then Ryousuke was exhausted.

They rolled onto their sides so they could stroke each other’s hair and nap quietly while they were joined by Ryousuke’s knot. 

“Was that good, Haru-chan?” Ryousuke asked. 

“Mm…” Haruichi murmured sleepily. “You?”

“Amazing,” Ryousuke replied.

“I think we might have made a bit of noise, Aniki,” Haruichi whispered. 

“Omega rooms are soundproofed, but yes, we’ll get caught soon. I’d better message Rei. Sleep, Haru-chan. Aniki will take care of everything before you wake up for the next wave.”

As Haruichi smiled up at him angelically before his eyes fluttered shut, Ryousuke thought to himself that he couldn’t have found a better Omega than this particular one, who had been beside him for so many of their life stages, had been so dedicated, so loyal, and was damn cute, so strong, and so very desirable.