Archive of Our Own ^beta

He could be normal about this. 

Choso could be totally, completely, entirely normal about this. 

He’s glad he changed into jeans before going on this little errand. If some concerned mother caught him staring down at the colorful box in his hand with a raging boner in the grey sweatpants he’d been wearing, he’d probably have to go to a completely different town just to buy Yuuji what he needed. 

Who could blame him, though? This was his first time shopping for this type of thing for his little brother. Yuuji had been on hormone blockers in middle school and had started testosterone as soon as he was a freshman in high school. Recently, though, he'd stopped taking his testosterone, happy with the permanent changes he'd received from it.

It seemed to surprise both of them when Yuuji called him from the bathroom down the hall in their apartment, timidly explaining that he’d gotten his first period, and that he needed Choso to go shopping for him. 

Choso had needed him to repeat himself almost three times before he’d fully processed the request, his ears ringing as his pants tightened. His little brother had sounded so ashamed, hanging up immediately after Choso’s hasty ‘of course I’ll go for you’. 

His eyes moved from the dark blue box to the phone screen, checking the response he’d gotten last. He’d already read the conversation a thousand times, but he couldn’t help but drink in every word again.

Choso, 11:41 am: What size do you need? Do you want pads, too? Any chocolate?

Baby Brother <3, 11:43 am: just the tampons

Baby Brother <3, 11:43 am: uh

Baby Brother <3, 11:43 am: idk, the big size? it seems kinda heavy ig

Choso’s heart tripped in his chest over the thought, and he fought the urge to readjust the line of his pants, seam straining against his aching cock as his mouth dried out. Guilt ate away at his stomach lining. He was supposed to be helping, not perving out over the thought of his little brother’s pussy drenched in thick blood, glistening and swollen. 

Choso, 11:45 am: K

It was all he could manage—wisely deciding to stuff his phone in his pocket to avoid the urge to ask for a picture.

Just to make sure he was getting the right size. What if it's too big? He wouldn’t want Yuuji to hurt himself putting in a dry tampon… The traitorous, horrible part of his brain whispered as he stuffed the variety pack of larger sizes into his basket, along with panty liners and thick pads just in case. Yuui obviously didn’t know how to shop for this sort of thing, so it was up to his big brother to make sure he got everything he needed.

He even stopped by the candy aisle to pick up Yuuji’s favorite chocolates, dropping them into his basket next to the pink bottle of cramp medicine Yuuji definitely hadn’t asked for. 

If Yuuji didn’t want to take the medicine, he could always help relieve the cramps…

Choso gritted his teeth, positioning the hanging basket over his crotch as he made his way to the register. 

He tried to focus on the beeping of the items as his basket rolled closer to the register on the belt. The cashier was a middle-aged woman whose eyes sparkled when she looked from Choso to the basket. 

“My, your girlfriend must be one lucky girl.” She giggled, and Choso felt like he was going to explode. Ears stuffed with cotton, he looked down into the basket and thought about how embarrassed and red Yuuji would be once he handed him the bag of items. He imagined the stuttered out little ‘thanks, nii’ and his heart stuttered in his chest. 

“I’m the lucky one,” He told the woman, who cooed over how sweet he was. His phone rang as he pulled his card out of the machine, and he immediately answered upon seeing Yuuji’s, wedging the phone against his cheek and shoulder. The cashier smiled wider, assuming that it was the girlfriend in question as she typed away on her console to finish out the sale. 

“Nii? Did you get the stuff?” Yuuji asked, his voice nervous and pitchy, hesitating on the word stuff, too ashamed to say what it was. 

“Mhm, I grabbed you some meds, too.” He replied, glancing into the bag to double-check its contents. 

A sigh of relief, and Choso can practically hear the small smile over the phone. “Thanks, nii. Get home safely.” Choso’s cock jumped, and he swallowed thickly. 

“Of course, Yuu. See you soon.” Once the call ended, Choso looked up and met the somewhat horrified gaze of the cashier. Cold sweat collected on the back of Choso’s neck, and he took the receipt that had been held out to him for a solid minute before grabbing the bag on the counter and making a hasty retreat, pulling the seam of his pants down as he exited the store and walked to his car. 

He was so fucked. 

When he got home, he barely hung the keys next to Yuuji’s by the door and kicked his shoes off before heading straight for the bathroom down the hall. He managed to restrain the urge to just open the door and personally see to it that Yuuji was taken care of. 

His knuckles rapped on the wood a few times before the door cracked open, and familiar golden eyes peeked out at him. Not trusting his words, Choso held the bag out to Yuuji, straining to hide the jump in his pulse. 

The other’s face flooded with relief and he smiled gratefully up at his brother, taking the bag. “Thanks, nii.” He said genuinely, his smile soft and kind. He looked almost innocent, completely new to this experience. 

“Of course,” Choso replied with a nod, his voice nearly breathless. “Let me know if you need any help.” God, he hoped that the other didn’t misinterpret his words. Or, rather, see right through the innocent offer to the revolting intention hidden beneath. 

“I will,” Yuuji responded with one last smile before closing the door, leaving Choso standing just outside, staring at the door and desperately wishing he had X-ray vision. 

He stood there like a creep for a few minutes, listening to the rustling of the bag as Yuuji dug around inside to figure out what he would need. If Choso were in there, he knew exactly where he’d start and how he would help Yuuji. He’d start with the wipes, delicately cleaning through the boy’s folds and inner thighs, before moving onto the tampon to keep blood from dribbling out too soon after being freshly cleaned, then he'd feed him some pain meds and get him on the couch with a heating pad. 

What if the tampon was too big? His brain supplied helpfully, and Choso’s breathing grew shallow and quiet as he imagined fingering his little brother’s poor, aching cunt open to allow a better glide for the tampon. 

Just as he’s about to turn and remove himself from his station in front of the bathroom door to avoid going right in and following through with his disgusting thoughts, a little voice calls from inside. 

“Nii? Are you still there?...” Yuuji’s questions are stuttered, hesitant, and filled with embarrassment. Choso’s cock jumps, as if to get through the door to follow each word. 

“Yeah,” He replies, his hand finding the doorknob. “You okay?” 

There’s a shuffling coming from inside, the sound of something sticky peeling from fabric as Yuuji sighs with frustration. 

“T-they won’t fit,” He says, and Choso gets lightheaded, swaying with his hand white-knuckle on the handle. “And the pads keep getting too soaked…” He sounds so, so embarrassed, frustrated with the sudden change in his body. 

Choso lets himself into the bathroom before he can stop himself, following the twitch of his cock like a literal bloodhound. Yuuji’s face flushes bright red as soon as he sees Choso coming in. He grabs the bottom of his hoodie and pulls it down his thighs further, his boxers pulled down to his knees; it's clear he’s changed them. There’s a wadded-up pair in the trash under the sink, the crotch stained bright red. 

He’ll have to remember to retrieve them tonight. 

Choso can hardly entertain the thought, his eyes busy taking in all of the scene as they dart from the bloody tissues, the tampons with bloody tips– failed attempts, in the trash. Then to the way Yuuji’s fingers avoid touching his hoodie as much as possible due to the blood tainting them. 

Choso wants to suck them clean, his teeth ache with a creak as he grits the urge away. 

“Y-you didn’t have to come in. It’s gross in here!” Yuuji protests, seemingly frozen to the spot, his eyes looking anywhere but at Choso. 

Dark eyes roam back to the barely trembling figure, and he looks down to the wet pad clenching into a rolled-up ball in his brother’s other hand. He’d just torn it from his boxers after it was immediately ruined by the hidden pussy. 

Choso had to see it.

“Don’t you want my help?” Choso rebukes, his words coming out soft and helpful, as if trying to tame a spooked animal. The guilt clawing and fighting him is swallowed by the greed welling up in his stomach. 

“I dunno how you’d help…” Yuuji responds, chewing his lip. Not a refusal, just hesitance. Choso can work with that. 

“I do,” Choso tells him honestly, easing the tension out of Yuuji’s shoulders as he makes his way over. This is bad, perverted. Yuuji trusts him. He shouldn’t take advantage of the vulnerable boy. 

“Okay,” Yuuji responds, his cheeks bright red, gaze flickering up to peek at Choso, chin tilted to the floor still. “Please help, then.” 

Oh, Choso would help. Choso would help so well that Yuuji wouldn’t be able to go through a period without his loving, attentive older brother there to help. 

“Lift up your hoodie,” Choso coaxes him, his tone gentle, his urges violent. “I gotta see, so I can help.” He tells the other as Yuuji’s eyes fly open wide to argue.

After a second of hesitant shuffling, Yuuji’s hand slowly lifts the edge of his teal hoodie to reveal what was underneath. 

God. Choso was so fucking doomed.

Sitting between a pair of plump, semi-muscular thighs was a freshly-shaved, glistening crimson pussy. Yuuji’s little t-clit stuck out from under a plump hood, and his folds were puffy and throbbing. Beneath the smearing of blood the skin was red and irritated, clearly sensitive. Choso found himself kneeling on the floor, watching as a bead of blood dripped down the inside of his brother’s thigh, resisting everything in him from leaning forward to lick it up. 

Yuuji shuffled again, torn between watching him nervously and looking at the tile, his face almost as red as his pretty pussy. 

“Hand me the wipes, Yuu.” Choso instructed gently, not wanting to spook the poor thing. Yuuji did as he was told, handing the little pink pack of vaginal wipes to him, always obedient for his older brother.

“Thank you,” Choso hummed, peeling them open to grab a few. He raised one, trying not to show hesitation, trying not to seem too eager. His hands nearly shook as he pressed the cold cloth to the other’s thigh, watching as the flesh there jumped from the cold and jiggled lightly. Choso leaned forward just slightly, hiding the bulge in his lap as he gently wiped up all of the blood. 

His tongue would be more efficient.

He uses one thumb to spread the puffy lips, hearing Yuuji squeak and flinch as he wipes down his engorged clit and sensitive lips. Choso’s teeth ache the whole time. Once he’s done, he reaches for a tampon and unwraps it. 

“I-it won’t fit…” Yuuji whispers from above, eyeing the unwrapped, dark blue tube. Choso releases a trembling breath and places one large hand on the boy’s thigh, securing him as he sets the tampon back down.

“Okay, I’m gonna help it fit, then. Are you ready?” His thumb strokes little circles, wanting to soothe the other in whatever sick way he can, as Yuuji nods down at him, his eyes full of trust.

Choso reaches up with his free hand, sliding two fingers in the little dribble of blood already leaking from the freshly cleaned slit. 

God, his flow was heavy. 

“N-nii, don’t, that’s gross!” Yuuji protests lightly, putting a hand on Choso’s wrist, not quite pushing him away, hesitating as Choso’s fingers slide soothingly up and down his aching cunt. He bites a pretty pink lip, Choso’s teeth grow jealous. 

“It’s okay, Yuuji. You need help,” He urges, breathless, reveling in the way dark red dribbles into the palm of his hand. 

Yuuji’s fingers curl around his wrist, more for security than to deny. Choso’s greed rages in his gut, and his fingertips finally push through the folds, slipping right into the tight, burning heat. He nearly comes in his pants, his hearing going fuzzy as his eyes dart up to Yuuji. His little brother keens, curling over Choso as his brows furrow. 

Choso’s heart kicks into overdrive, and he studies the pleasure on the other’s face, hardly concealed. He pushes his fingers further in, experimentally. Yuuji is tight, but he’s not that tight. A tampon could’ve easily fit. Choso’s eyes flash with realization, lightheaded as he tries to process the fact that his little brother had lured him into the bathroom under the false pretense of needing help. 

Fuck, Choso almost couldn’t take it. 

He curled his fingers, fucking them all the way in abruptly, receiving a startled cry from Yuuji as his body jolts and he folds forward over Choso’s shoulder, legs shaking. 

Choso steadies him with the hand on his thigh, clamped down so tight that the flesh there pudges out around the outline of his fingers. His breathing grows shallow as he begins fucking his fingers in and out of the searing walls, receiving wet squelches noises and a handful of blood. 

“You know, Yuu.” Choso breathed, reverent, disbelieving, picking up the pace as Yuuji’s body shudders and writhes. “You could’ve just asked me to take care of your cramps.” Choso hums, watching with ravenous hunger as Yuuji’s cunt clenches and swallows up his fingers, devouring them eagerly. 

“I-I wasn’t!” Yuuji argues weakly, his muscles jumping and flexing as heat displaces that cramping ache in his gut.

Choso slips in a third finger, really feeling the stretch of his little brother’s cunt as Yuuji’s breath hitches. He fucks them up in slow, languid motions, feeling the gummy walls swallow him up hungrily. 

“Fuck,” Choso curses, watches as blood is replaced by pink slick, drooling into his hand as Yuuji moans above him. He curls his fingers, pressing into that little bundle of nerves, hitting it without needing to search as if he knew Yuuji’s body better than his own. 

“Uh!” Yuuji chokes out, his legs shaking. “There, mmn, right there…” He pants, hands fisted in Choso’s shirt, likely getting blood on it from his fingers. Choso groans in response, he almost checks if he’s asleep, there’s no way his little brother was letting him fingerbang him through his period cramps. 

Choso concentrated on the area, letting that ugly monster inside of him dictate the speed as wet slaps rang through the bathroom in rapid succession. His fingers hit that spot over and over, pounding into it without slowing down. 

“Ah–” Yuuji stuttered, body tensing tightly with a horrible tremor. “Oh, Cho-nii, d-don’t stop…” He begged, sounding ruined from Choso’s fingers alone. 

God, the things he could do to the boy with his cock. If he was this fucked-out of his mind with three fingers, he’d be nothing but a cock-whore in the sheets. 

Choso groaned in response, watching Yuuji’s twitching cunt as his moans grew higher, watching the way his thighs jiggled from the constant impact of his hand as blood flicked everywhere. Yuuji’s entire body scrunched up, muscles tight and rigid as nails dug into Choso’s skin through the thin fabric of his t-shirt. 

“Oh, oh fuck,” Yuuji cried out, panting as his pleasure finally snapped, shooting all through his body as his walls spasmed and he arched high. Choso’s pace didn’t falter, and his eyes grew wide as Yuuji flinched, simultaneously trying to get away and grind his hand into the pleasure as a second wave hit him and he squirted into Choso’s hand. 

Vision growing white, Choso leaned forward to wrap his lips around his brother’s cunt, drinking down the blood and spend as his hand strained to pound the last few waves out of the gushing pussy. He rocked his hips where he sat on the floor, his cock twitching as he spurted thick globs of cum into his boxers, producing a wet spot on the front of his jeans as he moaned into the hot, throbbing cunt on his tongue. 

“Nii~” Yuuji gasped, rolling his hips into the palm of Choso’s hand as his pace slowed into passionate thrusts. 

After a few seconds of catching their breath, Choso pulled his drenched fingers out, followed by a heavy drool of blood and gooey slick. He groaned as he finally reached forward and licked the fluids up from Yuuji’s inner thighs, cleaning him thoroughly as blood coated his chin and nose. 

Once finished, he grabbed the tampon tube and pulled the cotton part from the plastic. Yuuji watched, chest heaving with little pants as Choso fucked the tampon up into his cunt with his fingers, angling it into that spot until he was twitching in overstimulation and he had to reach down to still his brother’s hand. 

“You’re such a good boy, Yuu.” Choso praised, his gaze filled with adoration as he stood, pulling Yuuji’s boxers up with him. Yuuji’s face was bright red, and he returned the look with a smile. 

“Thank you, onii-chan,” He replied breathlessly, pulling his hoodie back down as he grew embarrassed once more. “I’ll um, ask, next time…” He said, blushing darker as Choso’s gaze flashed. 

“You won’t have to ask, Yuuji. Nii will be sure to take good care of you.” Choso told him honestly, lifting the other’s hand to his mouth to suck the drying blood off those fingers he’d been eyeing since entering the bathroom. 

Yuuji’s eyes widened, and he tried to pull his hand away. “Nii, don’t that’s gross–” Choso’s tongue rolled out between his pointer and middle finger, eye contact unbroken as Yuuji whimpered, sounding strangled. 

Choso would always help his adorable little brother.