Archive of Our Own

Shouyou regretted bringing Natsu.

She was having fun, yes, but Natsu was sixteen and drunk out of her wits sitting among a group of adult men, and as much as he trusted his teammates with his life, he wouldn’t trust them within 500 meters of his little sister.

There were a dozen empty cans piled up in a neat little tower to the side, and at some point someone had decided that Mario Kart wasn’t cutting it, so it was truth or dare, now. They crowded on the living room floor, most of the MSBY regulars and then Natsu and Osamu.

Osamu, because they were at the Miyas. Because they lived together, for some reason.

(They were all well aware of the reason, they just didn’t speak of it. Not in public.)

Shouyou didn’t really think of the Miyas when he (upon firm teary-eyed and frankly pushy requests from Atsumu) brought Natsu along, didn’t think of what a teenager like her would think of when she saw the twins whispering in each other’s ears, grabbing each other’s asses in passing, sitting so close their whole bodies touched.

It was supposed to be just a gaming night, but it was getting a little too adult with the drinking and the sexual questions and the wandering hands that would’ve otherwise been fine any other night without his teenage sister there, and Shouyou was as loose as any cool big brother could be but the way Natsu was laughing at Atsumu’s jokes and teasingly pushing at Bokuto’s thigh wasn’t sitting well in his tipsy stomach.

“Shouyou, truth or dare?” Osamu asked, a little smirk on his lips that mirrored his brother’s, because when they were drunk it was hard to distinguish which one was the least unhinged.

“Uhh,” he pinched his temples, feeling the alcohol sloshing in his stomach and melting his brain. “Truth.”

“When did you lose your virginity?”

It would’ve been an otherwise fine, maybe even funny question to answer in any other situation. But Natsu was staring at him from across the circle, head leaning on Bokuto’s shoulder as he gulped down the last of what was probably his 15th beer.

Shouyou was usually a flirty drunk, overtly sexual and even a little inappropriate (Brazil taught him a little too much about himself under the influence), but he was determined to die sexless and virginal under the eyes of his sister.

“... Can I have something else?” He smiled sheepishly.

All it got him was a row of cackling from the whole room. Pussy and it’s not even that bad interchangeably spat at him.

Natsu giggled mockingly.

He squinted. “Fine!” It wasn’t, but Shouyou was embarrassed at this point, and Natsu laughing at him always felt a little wrong, with how much younger she was. “Uh. Fifteen.”

The room gawked and cursed in surprise.

“That’s fucking young,” Atsumu said, even though it wasn’t.

“How was it, though? With whom?” Bokuto questioned, leaning against the teenager wrapping her arms around his bicep.

Shouyou sighed, chuckling a little at the messy memories of high school flings, even as embarrassed as he was. “Hmm… Tanaka-senpai. In the club room back at Karasuno.”

The room laughed and teased him, but Shouyou noticed Natsu went very quiet as she stared at her brother and he had to remember, suddenly, what age she was.

“But—” He waved his hands in front of him. “I was pretty young. Not really ready for it. Should’ve waited. Probably.”

“Huh,” It was Natsu who talked, to his dismay. “It’s not that young.”

There was a shift in the air as everyone turned their attention to her, and Shouyou wasn’t really sure how he felt about the way half of them were looking at his sister.

“Why ya say that, Nacchan?” Atsumu asked in a teasing tone, and Shouyou never wanted to hit someone in his life but suddenly he felt like winding up a fist.

She shrugged.

“I lost mine younger.”

The silence wasn’t awkward, to Shouyou’s despair—it was hungry. And he wasn’t sure if it was a hunger for knowledge or something else.

He watched his little sister adjusting the bra strap under her tank top, leaning back on her hands so the hem pulled up and showed a sliver of her tummy, and Shouyou suddenly had the urge to dress her in a nun habit as he looked around the room and realized everyone else was watching as well.

“Oho?” Sakusa scoffed. “Bet not younger than me.”

Natsu saw it as a challenge, twirling one of her twin pigtails and she squinted at the man. “I was twelve.”

“Oh, nevermind. I was thirteen,” the spiker hummed, but Shouyou couldn’t hear anything anymore that wasn’t the chuckles in the room and his own heart ramming against his ribcage like a rabid prisoner.

They all tried asking her questions. Where, who, how, and Shouyou wanted to grab his sister by the wrist and run from there until they were far away and alone so he could ask her what the fuck? as the image of his 12-year-old little sister spread out on a stranger’s bed, still flat chested and short haired, flooded into his inebriated brain.

“Natsu,” Shouyou finally spat out, feeling his stomach lurch, feeling his gut warmer. “That true?”

She nodded, tipsy and drunk and sweaty, fanning her shirt like she didn’t notice how her pink lace bra peeked out every time she pulled at the fabric, like she didn’t notice Meian sitting behind her on the armchair, or Bokuto beside her, or Atsumu by her left.

Shouyou felt nauseous, even more so with the way his own eyes lingered where they shouldn’t.

“He was nice!” She quickly tried to remedy, realizing what she had admitted to her brother. “Checked on me and everything… used protection, tons of foreplay. It was nice.”

Shouyou felt his brain fry.

“Foreplay?” Osamu chuckled. “What kinda—”

“Isn’t it my turn?” Shouyou chucked the empty can at Osamu’s forehead, eliciting cackling from around the room.

“Jealous, Shou-kun?” Atsumu snorted.

“No, just getting on with the game,” he blew raspberries at the man. “Plus, she’s my sister. I don’t wanna hear all that.”

“She offered the information, didn’t she?” The other twin shrugged, like he was free of consequence and free of Shouyou’s once-a-year anger bouts.

“Osamu-san,” Shouyou interrupted, cocking his head. “Truth or dare?”

Osamu squinted at him with a grin. “Dare.”

“I dare you to kiss Atsumu-san.”

It was petty.

The Miyas were an open secret amongst friends, but Osamu being a business owner and Atsumu being a renowned professional athlete and therefore a public figure meant that any scandal bigger than a peanut allergy had the potential to ruin their careers.

Everyone else knew, but Natsu didn’t. And Natsu was a terminally online teenager with very little self control.

So, yes, it was petty.

Their noses wrinkled in annoyance and Natsu gawked, covering her mouth with her hands completely scandalized and giggling like the awkward kid she was.

“Nii-chan!” She squealed.

“They don’t have to,” Shouyou put his hands up. “I can do a truth instead.”

“Yer truth will be some bullshit about when we first fucked, or something,” Atsumu winced. “Shou-chan, that’s nasty.”

Shouyou grinned.

“Alright,” Osamu sighed. “No filming, no taking photos, no social media.” He murmured to the room, though more to Natsu than anyone else, before turning to his brother and pulling him into a kiss.

It felt like winning some messy game of teasing for a whole five seconds before Shouyou glanced at his sister again and found something other than shock in her eyes.

He was expecting her to be just scandalized, maybe even disgusted, but he wasn’t expecting Natsu to look hungry as Osamu tongue fucked his brother's mouth and Atsumu tugged at his hair with whimper.

Okay. So Shouyou miscalculated.

“You guys don’t have to fuck in the middle of the room, you know,” Meian piped in, startling Natsu from her sudden daze. “Fucking weirdos.”

“That’s mean, Captain!” Atsumu pouted, pulling away but still holding his brother’s face in hands. “We’re in love.”

“Which makes it worse,” Sakusa murmured.

“Ya fuck yer cousin,” Osamu snorted. “I don’t wanna hear shit from ya.”

“At least he’s not my brother—”

“Guys, come on,” Bokuto piped in, looking almost sleepy in his drunkenness. “There’s a young lady in the room.”

Shouyou was still dizzy on the booze and the energy of the room, but there was a hint of common sense still hanging by a thread in his melting brain when he made to get up and tell Natsu that it was late, that they were going home—and then Osamu spoke.

“Natsu, truth or dare?”

There was a teasing grin on his face, and Shouyou knew he was about to get him back for that kiss.

“Was she playing?” Bokuto frowned. “Didn’t we decide she wasn’t?”

“She’s a big girl, right, Natsu?” Atsumu smirked down at her. “‘Samu won’t be too mean.”

Natsu was still affected by the scene she had just witnessed, probably processing the concept of incest as fast as her drunk, young brain could muster it. And Shouyou was starting to get a little sick when he turned to her.

“Natsu, you don’t have to—”

“Dare,” She squeaked.

Osamu’s smile grew sharper.

“Oi, be nice,” Meian glared at him, but there was an amused tug on his lips.

“I’m nice!” Osamu waved his hands before him in defence. “I’m super nice. I’ll make it a real easy one for ya, how ‘bout that, Natsu?”

She nodded, looking determined as she puffed her cheeks.

“I dare ya to kiss Shouyou-kun.”

Fucker.

“No,” Shouyou immediately said, feeling his cheeks heat up, feeling his mind go hazy. “No way, too far. She’s my sister—”

“Oh, so now is too far?” Atsumu rolled his eyes.

“You know that’s different, Atsumu-san—”

“Nii-chan,” Natsu suddenly raised her voice above theirs, bringing the attention of the room back to her. “It’s okay.”

“Natsu—”

“It’s just a kiss, right?” She smiled, shrugged, like this was fine, actually, kissing her grown ass brother in the middle of a bunch of grown ass men with her bra strap showing and illegally drunk. “It’s not like they’ll tell anyone.”

They wouldn’t, Shouyou was aware of that.

He was aware from their past experiences that whatever happened in that house wouldn’t see the light of day, that whatever his baby sister got up to (drinking, flirting with Bokuto, kissing her own brother), it would stay a secret. But the problem wasn’t who knew about it, it was doing it.

Shouyou watched in silence as his sister then crawled over to him, an innocent little act because she was tipsy and lazy and didn’t feel like standing up to take two steps, but it made his mouth dry and made his head spin because his little Natsu was crawling on all fours towards him, tank top sagging to show her pink bra and ass in the air with her tiny skirt probably giving the men behind her the view of their lives.

She sat back on her heels in front of him, blinking up at Shouyou with those big caramel doe eyes and flushed a deep red by the alcohol and the nerves.

“Natsu, you don’t have to—”

“It’s fine. Nii-chan, don’t be a wuss,” she rolled her eyes.

The room suddenly burst in laughter again, even Meian snorted at him.

“A teenager being braver than you, Hinata?” Sakusa tutted from the side, because of course he did, because messing with Shouyou when they were drunk was everyone’s favorite pastime.

It was fine when it was just the team, when it ended in a mess of limbs and moans and they all just fucked each other asleep.

But not this.

Not Natsu.

She leaned over, standing up on her knees and getting closer, too close and Shouyou couldn’t breathe.

“Stop looking at me like that!” Natsu pinched his cheeks painfully, making him wince. “It’s just a kiss! Have you never kissed someone before?”

“Yes!” Shouyou frowned, offended. “I’ve kissed!”

“Then you’ll live!”

“That’s not the problem—”

“The problem is that you’re a pussy—”

Shouyou pulled his mean sister into a meaner kiss.

If there was one thing that seemed to override the last strands of his common sense, it was the dumb sibling rivalry that Natsu had carefully cultivated between them throughout the years.

The booze didn’t help either.

There were whistles from around the room, some exchanged words Shouyou couldn’t really hear nor cared to, and then there were Natsu’s noises—because kissing his teenage sister was bad already, but feeling her moan into his mouth was a whole other world of wrong.

Shouyou rested a gentle hand on the back of her neck, another respectful hand on her waist, and gently brushed their lips as he tried with all his strength to not deepen it, not focus on how tiny she was and how sweet the smelled. Natsu had other plans, though, because hormonal teenagers were all the same no matter which hormones they were running on—her fingers tugged hard on his hair, another hand squeezing his thigh as she leaned over him and hummed into the kiss. And fuck if it didn’t affect him—Shouyou couldn’t help the groan bubbling in his throat or the way his shorts felt tight, tighter.

And then she tried licking Shouyou’s lips open, immediately startling him away.

“He didn’t say anything about tongue!” He squeaked, trying hard to pretend he was just appalled.

And on his deathbed he would still say he pulled away because it was going too far, not because of the heat pooling in his gut.

“Don’t be a pussy!”

“Where did you even learn these words?”

The guys were laughing, because this was funny, apparently—watching Shouyou try to wrangle himself away from his sister as she insisted that a game of truth or dare was plenty serious enough to consider sucking face with her own brother.

“Boo!” Atsumu mocked. “It don’t count ‘less there’s tongue!”

“That’s not a rule,” Shouyou groaned.

But it seemed like a losing battle when Natsu leaned over again and pressed their lips together, more aggressively this time, like she meant it.

Shouyou just wanted to leave and go home at this point before he did something stupid—because of the fucked up scenario, because of the way his body was reacting, because of the way his sister’s lips were soft and plush and tasted like cherry chapstick, how she giggled into the kiss and how he could smell the alcohol in her breath and taste the strawberry candy she had eaten earlier.

Natsu’s knees suddenly straddled him, placing her on Shouyou’s lap and bringing them dangerously closer. Shouyou wanted to pull away, to push her, because this was too much and he wasn’t about to let his little sister sit on his hard-on while kissing him in front of a bunch of drunk bastard men—but she tugged at his hair, dipped a tongue inside his mouth, and moaned into the kiss.

Shouyou was going to pass out.

“Natsu—” he breathed out a little desperate against her lips, but she just giggled, far past the point of common sense.

“Nii-san…” Natsu whined, drunk out of her wits. “It’s fine, just kiss me proper…”

“Natsu, wait, stop—”

“But you’re liking it…”

Shouyou groaned when she grinded down against him, balling his fists against the floor to keep his hands away from her. There were more whistles, chuckles, teasing words from the guys in the room, even Meian had a loopy smirk on his face—and suddenly Shouyou realized that if this escalated, no one would stop it.

Hell, they’d enjoy it.

“Natsu, I’m taking you home,” Shouyou tried, really did, but when he didn’t kiss her back she just latched her lips to his neck, kissing and nipping at the sensitive skin and Shouyou wanted to die as he couldn't help but moan into it.

With all the leftover scraps of prudence he had, Shouyou grabbed her by the waist and pushed her away, making his sister lose balance and fall on her back flailing her legs, giggling like this was some funny joke and not the beginnings of a crime scene.

“Nii-san got hard for me,” she snorted. “Weirdo.”

Shouyou squinted at her, sighing. There was more teasing around him, don’t stop on our account and get a room hurled back and forth. He didn’t listen, just gently pulled his sister’s skirt back down to cover her wet pink lace panties while his head swirled and his cock throbbed in his shorts.

“I’d get hard for anyone grinding on my lap, stupid.”

“But it’s me,” she grinned up at him.

“Yeah, which means you shouldn’t do that.”

“Shouldn’t do what?”

Shouyou pinched the bridge of his nose, feeling his judgement break as his sister pulled her skirt back up. Whether it was to tease or mock him he had no clue, and frankly didn’t want to know anymore.

“Shouldn’t be showing off like a slut in front of a bunch of grown men like you’re asking to be fucked,” Shouyou gritted out, forcibly pulling her skirt back down and he was about to staple it in place if he had to.

It was apparently too mean, too rough, unlike him, because everyone else seemed to sit a little straighter and look a little more sheepish.

Except the twins.

Atsumu crawled over to Shouyou, and in that heavy saccharine tone that he only used in their more intimate moments, murmured, “Shou-kun, relax, she’s just having fun.” Atsumu sat beside him, laid a hand on Shouyou’s thigh and gently squeezed. “Besides, what’s the worst that could happen?”

“...Huh?” Shouyou choked out, trying to convey outrage even as Atsumu’s tone and touch soothed him, made him softer at the edges.

“What’s the worst that could happen if she has a good time and a story to tell?”

Shouyou wanted to pass out.

He just sat there, hard and panting and drunk out of his wits while his sister laid sprawled out on the floor before him, legs spread open and skirt hiked up over her stomach while she giggled at Bokuto who seemed to have taken it upon himself to lean over her and whisper things Shouyou couldn’t hear, didn’t want to.

Sakusa was still quiet beside him but shifted over to get closer, while Osamu just grinned at Shouyou and Meian stared openly at Natsu’s panties with a soft smirk.

“Nacchan,” Atsumu called, sitting behind Shouyou and propping a chin on his shoulder. His sister looked back at them and away from Bokuto, who readjusted his shorts. “Are ya having fun?”

“Yeah…” She gave them a lopsided smile, inebriated and stupid.

“Did’ya like kissing yer brother?”

“Mh-hmm…” Natsu hummed happily. Shouyou’s breath hitched.

“And would’ya like doing other things with him, too?”

“Atsumu-san—” Shouyou choked out.

“Yeah…” Came Natsu’s breathy response, interrupting his words and his heartbeat.

“Well, shit, Shou-kun, that just solves itself, don’t it?”

That’s the opposite of solving anything, Shouyou wanted to say, but he could barely put two thoughts together, let alone form words.

“You’re pretty small, aren’t you?” Bokuto hummed, leaning over Natsu and chuckling low. “Your brother’s big. Have you seen it?”

She shook her head, and in cue Atsumu’s hands slid over Shouyou’s shorts and under the waistband, wrapping familiar fingers around his dick and gently tugging it out of the fabric.

Shouyou could only breathe shallowly as he watched his own sister stare at his cock hungrily, and then Atsumu started gently, slowly pumping his fist and forcing a groan from Shouyou’s lips.

Something-something-getting-out-of-hand. He stared at the wet patch forming on his sister’s panties and whimpered.

“Nii-san,” Natsu murmured, spreading her legs further with a wicked grin he only saw when she was up to something that would get him grounded. “Truth or dare?”

He snorted, a little hysterical as he remembered the stupid game.

“Dare,” he murmured, because it didn’t fucking matter anymore, none of it did.

Not when Atsumu was fisting his cock, not when the rest of the guys in the room were drunk and horny and hungry as they stared at the scene before them, not when Natsu slowly reached a hand between her legs and pulled her tiny panties aside to show off her dripping cunt and Shouyou would bet money it tasted just as sweet as her lips.

“Dare you to fuck me raw.”

Shouyou regretted many things in his life. A few missed serves that were crucial, some objects he lost or broke, opportunities he passed by without thinking.

Shouyou didn’t regret pushing Atsumu’s hand away so he could wrap his own fist around his cock to line it up with his sister’s pussy and shove it all in with one harsh, mean thrust.

“Holy fuck, he really did it.”

“Oh, this is great.”

“Told ya.”

The room erupted in low groans and teases, but Shouyou couldn’t focus on anything that wasn’t the way Natsu arched like a bow beneath him, wailing in some sick mixture of pleasure and pain that set off alarms in his brain.

“Oh, fuck, shit, I’m sorry—”

“No, no,” Natsu heaved, reaching out to tug at his shirt. “Fuck me hard, Shou-nii. Make it hurt,” She licked her lips with a smile way too gentle for her own words. “I like it when it hurts.”

Fuck.

He wrapped hands around Natsu’s waist, groaned as he watched his thumbs touching with how tiny she was, and immediately began fucking into his sister. She moaned loudly, obnoxious, like something out of a porno that would’ve sounded cheesy in any other scenario. Shouyou watched as his sister giggled and keened, fucked her with a bruising rhythm while Natsu’s gaze bounced from him, to Bokuto, to Atsumu behind him, to all the men in the room like she was performing, giving them a show.

“So fuckin’ pretty,” Atsumu murmured, almost startling Shouyou as he pressed kisses to his neck and cheek and slid hands down his sides, making him moan and curse under his breath. “She reminds me of you back in high school…”

Shouyou chuckled between moans, barely there as he thrusted into the tight heat of his sister’s cunt, as he watched her face contorting in the prettiest shapes and shades. His eyes followed Natsu’s hand reaching towards Bokuto, tugging at his shorts, fingers wrapping around his erection.

There was a feeling that he should stop it, like it was bad enough to fuck Natsu but letting anyone else in the room touch her was a different kind of fucked.

Shouyou let that feeling simmer and stale as Bokuto asked her in a murmur, “You sure?”

And Natsu giggled. “Yeah, lemme help you with that…”

Atsumu was still kissing his neck, running hands over Shouyou’s body and murmuring sickening sweet nothings into his ear about how tight she must feel, how hot she looked, how many cocks could his baby sister take in one go—but his head was swimming and the vision of Natsu taking another man’s cock out of his shorts and wrapping her lips around it shouldn’t be making Shouyou twitch inside her, shouldn’t be making him moan.

It wasn’t a surprise when Shouyou’s eyes flitted around the room and he saw Meian palming himself, saw Sakusa already leaning against the armchair and fucking into his fist, and saw Osamu crawling up to Shouyou with a devious grin on his lips.

Shouyou’s thrusts slowed when Osamu stood on his knees to pull him into a kiss, cradling his face with tender hands while Atsumu pulled Shouyou’s shirt up over his chest to tug at his nipples.

He felt like he was melting, engulfed in touch and pleasure from all sides and all he could hear was the slapping of skin on skin, the wet whimpers from his sister’s stuffed mouth, and his own moans as Osamu kissed him stupid, as Atsumu played with his chest, as Natsu’s pussy squeezed tight around him.

Osamu pulled away from the kiss, staring at Shouyou with a lopsided grin before whispering into his ear in honey-sweet words, “Watch her. She’s so pretty, isn’t she? Feels so good ‘round ya… I know how it feels.” He kissed Shouyou’s neck. “Feels better because she’s yer sister. S’like she was born for ya, isn’t it?”

Shouyou whimpered helplessly, a useless plea for mercy so Osamu’s words wouldn’t settle in and take root. And yet, he did watch—drank in the view of his baby sister’s cunt wrapped around him vice-tight, her tits bouncing gently under her shirt with every thrust, and Natsu’s face—she looked blissed out, slobbering all over Bokuto’s cock while she moaned so sweetly, flushed all over and lips cherry-red as her pigtails swayed.

And then he watched Bokuto grunt, wrap gentle hands on her head, and bottom out into Natsu’s throat as he came.

He pulled out and sat back with a sigh, cum trailing out and dripping from her lips even though she swallowed most of it. Natsu turned back to her brother, face covered in spit and cum, and giggled obscenely.

“Feels… so, so good, Shou-nii…” Natsu moaned, hiccupped. “Harder, ple—ahh, please, please…”

Shouyou tore himself away from Atsumu and Osamu and leaned down, licked Bokuto’s cum off her cheek and smashed their lips together in a messy, sloppy kiss before fucking deep into her at a bruising pace. Natsu moaned into the kiss, wrapped her arms around his neck and her legs around his waist and licked into Shouyou’s mouth with a whimper.

“You like showing off, huh…” Shouyou murmured almost absentmindedly, lips still brushing against hers.

She hummed playfully. “Feels good when they watch me…”

“Feels good?”

“Hmmm, yeah…”

“Just watch?”

“No… ahn…”

Shouyou took a deep breath before sitting back on his heels to look down at her, slowed his thrusts and reached down to push her little tank top and lace bra up and over her tits, then to unbutton her skirt and pull it open and off.

Natsu had the decency to look a little flustered, moving to cover her tits even if it was useless, stupid to do so. Shouyou chuckled, pried her little hands off and tugged hard at her nipples while fucking into her, drawing the prettiest moans from his sister’s lips.

“Fuck…” Sakusa murmured from the side. “He’s so gone.”

Shouyou sighed. “She’s having fun.”

But it sounded more like he was convincing himself first and foremost.

“Well, before anyone else has their fun,” Sakusa continued, shuffling over to knee beside Natsu and reaching to replace Shouyou’s hands with his own on her tits, fondling them gently and pulling at her nipples with a scoff. “May I?”

Natsu nodded, mouth agape as she moaned from her brother’s languid, deep thrusts.

Shouyou already knew Sakusa wouldn’t dare touch her mouth, not after Bokuto had his way with her. He instead fondled one of her tits with a hand and took his cock with the other, quickly pumping himself until he spilled over her tits with a heavy sigh and a sharp pull on her nipple that made Natsu wail and clench around Shouyou, dragging a groan from his lips.

Sakusa wiped the head of his cock on her clean cheek, pulling it away and tucking it into his pants when she turned to wrap her mouth around it.

“Nu-uh, not interested in Bokuto’s sloppy seconds,” he said, making the men in the room snort. “Thank you, though.”

“Stingy,” Natsu blew raspberries at him, but Sakusa just moved away with a chuckle and sat back against the armchair.

Shouyou leaned back down, licked the familiar cum off his sister’s tits and sucked on them, tasting bitter and salt. He grazed her nipples with his teeth, tugged on them and moaned as he shoved into her, feeling her clench and hearing her whimper underneath.

It was nii-san, nii-san, nii-san moaned over and over again, cut off or choked out, but still there—Shouyou. She was begging for him, and it swirled something ugly in his gut, like she was proving Osamu right.

It felt good because this was Natsu.

Shouyou stood on his knees, slipping out just to manhandle her on her stomach and lift her on her hands and knees.

“Shou-nii—ah!”

He shoved back into her cunt, maybe a little too rough but it didn’t matter when Natsu was so wet he could probably slip a fist inside his sister.

“Whoa, don’t be too rough on her,” Meian chuckled from the couch, though he was openly jerking off now.

Shouyou looked up at him, back at his sister, and grinned. “Wanna play with Meian-san, too, Natsu?”

“Yes! Ahh, please, please, please, let me—ahhnn…”

“Yeah… alright…”

She giggled hysterically, turning to look over her shoulder with a sweet smile. And god, Natsu looked gorgeous like that—on all fours with her back arched and her curly pigtails bouncing. He reached over and twisted his hands on each pigtail, clutching them and pulling until she arched further with a loud mewl.

Shouyou had helped change her diapers, had watched Natsu take her first steps, let her sleep in his bed during thunderstorms, secretly ate her greens so their parents wouldn’t force her to scarf them down.

And now he was fucking her raw in the middle of a room full of grown men as she moaned for him, begged for more.

It was the most disturbing thing Shouyou had ever done in his whole life—and the most arousing, too.

Osamu was right, and Shouyou hated him just a little for that.

“Captain,” Shouyou called, hearing his voice a million miles away. “Let Natsu help, too. Go on.”

“Shou-nii—ow!”

He interrupted her with a harsh tug on her pigtails.

“Jesus,” the captain said. “Getting rough on the kid, aren’t you?”

But he still walked up to her, still fell to his knees and lined himself up with her mouth, and still pushed in.

She squeezed around Shouyou and moaned obscenely, wet gagging noises choking out whimpers over and over with each thrust from both ends. Natsu’s cunt looked reddened and used raw even with how wet she was, puffy around his cock and probably starting to ache as he fucked her harder.

“Shou-kun, fuck,” Atsumu murmured from behind him where he was likely kissing his own brother. Not that Shouyou had the mind to care. “Can I have a turn, too?”

“Ask her,” Shouyou spat out. “Natsu’ll say yes, though.”

Like the loose whore she is, was implied.

Meian was a good captain—dependant, diligent, stern where it counted. But during these nights he was vicious, and tonight was no different. Even if it didn’t involve a handful of well built, fully grown athletes, and instead involved a tiny teenage girl under the influence.

He fucked deep into her throat, drawing fat tears from her eyes as he licked his lips and smirked down at her.

“Your sister’s fucking pretty, Shouyou-kun,” Meian chuckled just a little wickedly. “Looks so much like you, especially with her mouth around a cock.”

Shouyou couldn’t help the moan that left his lips.

“That’s ‘cause their mother’s hot,” Bokuto piped in excitedly, like this was just a casual conversation between friends. “I’ve seen her. Good genes.”

“Maybe we should fuck Hinata momma, too,” Atsumu snorted, leaning his chin on Shouyou’s shoulder. “Maybe it’ll be fun to watch mom moaning and begging for cock, right, Shouyou-kun?”

“Maybe we should call mommy over next time,” Osamu piped in. “Teach her how it feels to have her son back inside of her.”

Shouyou bit back a moan, trying and failing to scrub the image from his brain. His sister was bad enough, but even thinking about his mom right now made his stomach lurch—and made his dick jerk.

“Drink up, sweetie,” Meian murmured suddenly, before bottoming out in Natsu’s throat and drawing a concerning retch from his sister while the captain came with a grunt.

He pulled out, making Natsu choke and cough, drool and cum pooling on the hardwood floor between her hands. Shouyou didn’t let go of her hair, still fucking into her but slow enough to keep his own orgasm away as Meian stared at her face with tired but dark eyes, tucking himself back into his jeans.

“Tastes good, sweetie?” He murmured.

Natsu choked on her own moans once, twice, three times before she finally managed to speak, “Tastes so, so good… ahhn… but… Shou-nii’s kiss… tastes better…”

She giggled, innocently, like she hadn't just ruined Shouyou for life.

He let go of her pigtails and manhandled her on her back once again, panting and lightheaded, lost in her words, in her body, in the want and need that Shouyou didn’t even know was there until he was already taking her.

Natsu’s face was covered in drool and cum, her cheeks were flushed a bright red and she looked barely conscious when Shouyou slid back inside and leaned over to press their foreheads together before snapping his hips sharply. Her face contorted in pleasure, mouth falling agape as Shouyou pounded her hard enough to bruise, to hurt, to fuck the shape of his cock into his sister’s cunt because that was all she would need from now on—him.

“Natsu, Natsu, Natsu…” Shouyou murmured, holding her closer.

She hummed happily before cradling his cheeks and pulling Shouyou into a messy brush of lips. “Come ins—ah… inside… me… ahnn… Shou-nii…”

Shouyou grunted and stuffed her lips with his tongue, licked the taste of alcohol and strawberry from her mouth as he fucked her hard, harder, and when the heat pooled in his gut and the orgasm hit him, Shouyou didn’t even think before he spilled deep into his sister’s cunt.

Natsu whimpered against his lips, wrapped her legs tight around his middle while Shouyou gently fucked his own cum deeper inside her and kissed her languidly, lovingly.

He pulled from the kiss, still pressing their foreheads together as he stared into his sister’s eyes and softened inside her pussy.

“See?” It was Osamu’s voice, a murmur against his ear before the man kissed the top of Shouyou's head. “It’s better, isn’t it?”

Shouyou wasn’t going to answer that question, even if Osamu was right.

He pulled out and watched his own cum dribbling down Natsu’s red, used pussy, puddling under her ass. Shouyou stepped to the side, kneeling by his sister and leaning back down to take her face in his hands and properly, gently kiss her.

When Natsu moaned pathetically into his lips, Shouyou realized Atsumu was slotting himself between her legs, Osamu kneeling behind him and holding his brother’s cock with a dark grin.

Shouyou turned back to Natsu, rubbing gentle circles on her cheeks with his thumbs. “You okay?”

She nodded sleepily. “Wanna feel Atsumu-san inside…”

“Mh-hmm…” Shouyou hummed.

He turned to the twins again, watched Osamu murmur into his brother’s ear something that made Atsumu whimper under his breath, before lining up Atsumu’s cock with Natsu’s leaking cunt and pushing in.

Shouyou kissed her again just to drink the moans from her lips. Kept kissing her the whole time, feeling her body rocking underneath him while Atsumu fucked her fast but gently, tasting her whimpers with each thrust. He sat up to watch her face twisting in pleasure, reached a hand down to her pussy and slid fingers between her folds to gently circle her hard, aching clit.

Natsu wailed, body thrashing as Atsumu fucked her deep and Shouyou rubbed her twitching nub. He leaned back down to kiss her with a whimper.

“Gonna come, baby?” Osamu murmured, still loud enough for the room to hear.

Atsumu moaned softly. “Yeah… yeah, ‘Samu… hmm…”

“Come for me, Natsu,” Shouyou whispered into her lips. “Let me hear you…”

“Nii-san, nii-san—ah, ahn!”

Natsu arched taut like a bow, throwing her head back with Shouyou’s name on her lips as she came on Atsumu’s cock.

Shouyou was sure he could hear Atsumu tipping over the edge as well, but he didn’t care—not now, not when he was busy kissing the moans off his sister’s gaping lips as she whimpered into his mouth softly. Too soft.

When he pulled away it was to find Natsu passed out, fast asleep while Atsumu was still pulling out of her stuffed pussy, covered in her own spit and his teammates’ cum. Shouyou stared, breathing hard and heavy as the vision of his sister fucked asleep and caked in fluids burned into his brain.

Ah, he was so fucked.

“Hey, hey,” Bokuto was the one who shook him out of his daze, because Sakusa and Meian had fallen asleep and Atsumu and Osamu were kissing each other tenderly, too lost in their own world. “Let me help, yeah?”

Shouyou wanted to cry, but he just nodded softly.

In the end, it ended up being more Bokuto helping them both than helping Shouyou clean her up.

Shouyou's changed Natsu into some clothes he kept in the Miyas’ house, after Bokuto had diligently cleaned her face, chest, and the cum running down her legs in the bathroom, straightening her panties and removing her shirt and bra. Bokuto helped Shouyou tuck her into bed in the guest room, turning to assist Shouyou standing up while taking off his shirt and shorts.

“Bokuto-san…” he murmured, tugging at his sleeve before Bokuto went on his regular routine of cleaning up empty cans and snack bags. “Thank… you…”

The man grinned, leaning down to pull Shouyou into a tender kiss before pulling away to ruffle his hair.

“She had fun,” Bokuto said. “So did you. Just don’t get too caught up in it.”

Shouyou was way too drunk and exhausted to find the meaning in his words, so he just nodded and let Bokuto go on to his chores.

The silence of the dark room was stifling, but thankfully or not, Shouyou was much too inebriated to overthink—or think at all. He slid into bed with his sister, pulling her sleeping form against his chest and burying his face on the top of her head, breathing in citrus shampoo and Natsu.

Consequences didn’t have to matter until morning.