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Kirishima is no expert in biology but he strives to be a good alpha and a good person, so he knows about omegas’ heats and phantom heats, which are what an omega can have when they’re on suppressants and their body can’t go into a proper bout of reproduction oriented hormones.
Still, that is the furthest thing from his mind when he goes up to Bakugo’s door in the afternoon, after the blond had acted under the weather the whole day and had retreated to his room as soon as he could. That was some time ago, and though Kirishima knows the omega doesn’t like to show weaknesses, maybe now he’s had enough time to pull himself together, and if not, Kirishima can offer his help.
When he gets there, heavy panting can be heard through the door, and he knocks worried.
The sounds reduce, and then it’s Shinso’s voice calling out “who is it?” from within the room.
Oh, are Bakugo’s boyfriends over? Well, that never stopped him before from saying hello and checking in on his friend.
“It’s Kirishima!”
Silence meets his words, until Shinso can be heard again.
“Mashirao, get the door.”
Something is strange, Kirishima knows that, but then Ojiro is opening the door a little and peeking out. “Get in quick.”
“Uh? Why-?” and then the scent hits him. A heady, heavy combination of burnt sugar, smoke and spices that makes his mouth water and on instinct he wants more of it while shutting everyone else out.
In seconds he’s inside, the door slammed shut behind him. The sight that greets him it’s an erotic dream.
Bakugo’s bed (the new, bigger one that suddenly appeared when he started dating) is covered in towels, wet spots already upon them, a dildo with a knot lying discarded but pointing at the centerpiece: Bakugo on his knees, his dripping, loose ass on display while his head is shoved between Shinso’s legs, mouthing at his balls and deflating knot as his cock rests half hard on his face.
At his side, Ojiro is as bare as the two men on the bed, and Kirishima feels overdressed, and blessed and aroused and cursed and like he should probably get away while he still can.
But then Bakugo must sense him, because he lifts his head from Shinso’s groin to bare his teeth and growl towards the door, turning to hide his genitals from the intruder.
Kirishima is ready to get on his knees, whine, bare his neck, back out, whatever to destress Bakugo and let him get back to his blissed out state, when a hand curls strongly around Bakugo’s nape.
“Shh, Katsuki, shh, it’s just Eijiro.” Shinso’s deep voice is like pure liquid sin, and the way he says Kirishima’s given name sends a shiver down his spine. Out of the corner of his eye he sees Ojiro react in a similar manner, but his attention is on the bed.
Bakugo blinks his eyes a couple of times until they’re mostly clear. “Ei?”
Kirishima nearly doesn’t dare breathe, he feels everyone’s eyes on him, but Bakugo has said his name in such a sweet manner he can’t help but try to answer in kind. “Katsuki?”
Bakugo shivers in response before grinning. He looks a little more like his usual self like this, but then he licks his lips lewdly and turns to Shinso for guidance, asking “he’s staying?” and Kirishima’s world tilts on its axis yet again.
“I dunno, kitten” Shinso is saying, the hand he has on Bakugo lightly petting his back now, but his eyes piercing through Kirishima. “Is he staying? He could if he were good...” The petting hand is traveling lower, nearing Bakugo’s ass cheeks, and Bakugo is arching into it. “If he played by the rules, if he listened to orders...”
As distracting as the hand is, the words have Kirishima’s full attention. He may be a little dense sometimes, but social clues are not lost on him and this, right now, is Shinso establishing himself as top alpha, and if Kirishima wants to stay here any longer he should acknowledge that.
He’s aware of Ojiro ready to spring into action at his side, the beta would probably deck him and boot him out as soon as he twitches wrong, but Kirishima has no intention of leaving this place now that he’s been allowed in and he also has no problem in submitting to Bakugo’s alpha if it means he can stay.
So Kirishima nods his head and when Shinso raises an eyebrow, he wets his dry mouth and answers “I’ll listen”, then tilts his head slightly to show a bit of throat while still looking at the other alpha
Shinso grins wickedly before saying “clothes off, then” and just like that, on Bakugo’s next lustful moan, the tension dissipates from the room.
Well, not all tension, because Kirishima feels like live wire as he struggles out of his shirt while toeing off his footwear, nearly tripping, and why wouldn’t his belt buckle cooperate…
There are hands on his in the next moment and Ojiro is close, so close, and then they’re kissing as the blond’s fingers make quick work of his belt and trousers.
Kissing Ojiro is very nice. Admittedly, Kirishima doesn’t have much experience in that department, but the way the other ghosts his lips softly on his mouth, before nipping playfully at his lower lip and sliding his tongue in teasingly feels good after all of that tension.
A whimper from the bed diverts his attention and then he witnesses something beautiful. Shinso is lazily pumping fingers in and out of Bakugo’s ass, his other hand resting lightly on his own hard cock, which is big now that Kirishima has an unobscured view of it. Bakugo is muffling his sounds with the back of his hand, eyes half lidded and glassy with pleasure. They’re both looking at him and Ojiro.
“They look good, don’t they?” Ojiro whispers in his ear, and then the other boy is gone, kneeling on the floor, having dragged down Kirishima’s pants and underwear with him, leaving him naked with his cock bobbing from being freed. Hungry eyes rove the expanse of his skin, dragged back to his dick over and over until Ojiro is licking his lips. “You look good, too” and then he’s nuzzling the side of his cock and oh…
“Kirishima” Shinso’s voice cuts coldly through the fog of building pleasure and everyone snaps at attention because his tone is very serious. “You’re clean, aren’t you?” and Kirishima gets the distinct feeling that if he were to respond in the negative now there would be painful consequences. Thankfully, he’s not neglected to mention anything of importance. “Yeah, yeah I’m clean.”
Shinso’s murderous aura disperses as quick as it has come. “Good” he rumbles, and the sound does things to Kirishima. “Go on, Mashirao, but get him closer, would you?”
Kirishima’s head is lightly spinning as he’s softly manhandled to step out of his rumpled clothes and closer to the bed, his eyes fleeting from one attractive person to the other, until Ojiro is kneeling again and licking up a stripe of wet heat under his cock and he has to brace on his shoulders as his knees threaten to buckle.
Ojiro is undeterred by the weight Kirishima is putting on him, purring satisfied instead as he wraps his lips around his head and starts suckling lightly.
An angered mewl from the bed gets his attention and his mouth drops open at the sight.
Bakugo’s legs are hooked over Shinso’s, leaving the blond completely exposed as he’s slowly being fucked into, Shinso’s fingers nearly touching where he’s holding him up at the waist while his hips roll to sheath him completely in the wet heat over and over. As close as he is, Kirishima can see his dick glistening with the slick and cum that must have already been coating Bakugo’s insides. His mouth waters with the need to taste.
But maybe the best part is how the pair is clearly focused on Kirishima himself and Ojiro, Shinso smirking sinfully with his teeth embedded in Bakugo’s shoulder, but Katsuki, oh Katsuki… He’s glaring bloody murder at his beta, his tiny fangs on display as he claws furiously at Shinso’s neck and deltoids.
Shinso chuckles as he detaches his mouth from the omega’s skin, lapping up the drops of blood in a way that has Kirishima transfixed. “Aww, what is it, the little kitten wants all cocks for himself?” he taunts talking into blond hair, but loud enough for everyone to hear.
A heavy suck makes Kirishima nearly buck forth with his hips, but he steadies himself before looking down guiltily at Ojiro. He hasn’t forgotten the blond but there’s just so much happening, but he doesn’t want to neglect him… Yet, as he looks down, Ojiro’s gaze is locked with Bakugo’s, even as he stuffs his mouth with half of Kirishima’s dick and moans around it like a whore.
Eijiro has a moment of internal panic as he realizes he thought of another alpha’s beta as a whore, never mind that he is his classmate, but then Shinso’s voice cuts through it all, even as he’s still talking to Katsuki. “Mashirao deserves cock as well, you know, he’s been good to you, fucked you real good with his dick and your toy.”
This time when Kirishima’s wide eyes land back on Ojiro the blond is looking up at him, attempting to smirk with his mouth full, their eyes staying locked even as he sucks up the length until only the tip sits on his tongue, Ojiro leaving it lolling out as he moves his entire head to spread Kirishima precum on the slippery organ.
Bakugo’s thrashing gains their attention again, even as Shinso is laughing at the omega in his lap. “No? You want all cocks for yourself?” Bakugo is nodding and yowling, gone beyond words, then Shinso slaps the inside of his thigh, hard, and the blond in his lap seizes up. “Greedy bitch” and Kirishima can’t believe the needy keen that leaves Bakugo’s mouth at the words. “You want your holes stuffed full of every cock around, don’t you?” Shinso’s hips are pistoning up hard and fast, Bakugo melting and tensing alternatively while his eyes roll back. “Well, it’s not just Mashirao and I this time, sweet cheeks,” he punctuates his words with another harsh slap and Bakugo shrieks. “There’s two alphas here now to stuff you up, can you take two knots at once?”
Bakugo cums and it’s explosive, his thin omega seed shooting up as far as his chin as he shouts.
Kirishima is riveted on the picture he makes, even as Shinso now shushes him softly, lightly running his fingers through the mess on his chest and stomach.
Kirishima catches sight of Ojiro again as he crawls onto the bed on his hands and knees, tail swaying slowly in contentment as Shinso offers him his cum cover fingers and he cleans them up, before lowering himself to lap up all of the rest.
Katsuki whimpers as the beta leans up to kiss him and share his load with him, but opens his mouth docilely enough and Kirishima is treated to the sight of white being swapped around with saliva, until they both swallow to breathe properly.
“Hmm…” Kirishima’s eyes snap to Shinso as he hums, finding the other alpha studying him intently. He resists the urge to cover up as he feels that gaze sweep over him, not daring to move as he doesn’t know what the other is looking for. Submission? Cockiness? A weakness? Kirishima doesn’t know, but he’s privately terrified of being found lacking.
Some of his apprehension must transpire because Shinso’s expression softens a fraction, then he asks “Can you hold it for a while? Our omega here” and the phrase is dripping possessiveness as it wraps around the trio on the bed, eliciting a shudder from Bakugo and Ojiro, “he may be a needy little thing, but he deserves to be dicked down long and hard as much as he wants.”
Katsuki purrs happily in reply, squirming a bit in Shinso’s lap, and the hand that’s caressing circles on a milky thigh brings Kirishima’s attention to the fact that both boys are still hard (so are Ojiro and Kirishima himself, but they hadn’t being fucking).
Kirishima makes a strangled noise, before croaking out a “how…?” and leaving it there, as he doesn’t know how to continue. He’s saved by Ojiro, who helpfully starts to explain “it’s his phantom heat” before cutting himself off and looking at Shinso as if for permission. It is strange to see, as normally neither blond defers to their alpha in any matter and Shinso never butts his nose in their business, but in the bedroom it’s painfully clear who’s in charge. Not that Kirishima can say anything, as he’d handed over the reins as soon as he’d stepped in.
Getting a nod from the lavender haired alpha, Ojiro goes on. “Katsuki’s phantom heats make him really horny for a day or two. He gets a bit bitchy if he doesn’t get all the cock he wants.” His words might sting if it wasn’t for the fond tone he has as he lightly pets Bakugo’s wild hair. “So we marathon sex to keep him stuffed and satisfied.”
“And today, you’re here to help provide that” Shinso adds, before narrowing his eyes at Kirishima and growling out “aren’t you lucky?”
And Kirishima is very aware he’s very lucky, being allowed to see this side of the triad, being allowed near a claimed omega in his phantom heat, being allowed… is he understanding this correctly? Because it sounds like he’ll be allowed to be inside of Bakugo and that thought is nearly too much.
His wide eyed wonder must be enough of an answer to make Shinso back down again, or maybe, given his sharp inhale, it’s something else entirely. Something like Bakugo squeezing around the dick still planted in his ass to tone down the aggression the alpha at his back had been putting out.
“Alpha” he mutters with a hoarse voice as his eyes flutter open. He blinks sluggishly before focusing on the beta at his side. “Mashi...” he greets with a sloppy grin and a sloppy kiss, before turning red dilated eyes on Kirishima, who feels himself blush as the lewd gaze slowly travels over his face, shoulders, pecs and abs to land on his cock. Bakugo licks his lips and swallowing has never been more difficult.
The omega turns to look at Shinso, but his eyes keep flicking back to the thick piece of meat he’s salivating over. “Can I?” he asks his alpha
Because Shinso is a dick, he has to answer “I don’t know, can you? He seems pretty big” and Kirishima just wants to die at the leering smirk directed his way, coupled with Ojiro’s humming agreement. Except he really doesn’t want to die because this could be leading to something so much better, so he endures Bakugo’s serious appraisal of his junk.
“He doesn’t seem to be longer than you, maybe a bit thicker, but I can take it” decrees the omega, and Kirishima is fearing that the amount of blood going simultaneously into his blushing and into his cock is going to leave his brain dangerously under supplied, even as he hears Ojiro cheerfully put in that he “can confirm that estimate”.
There’s a bit of a lull in the conversation as Shinso plunders Ojiro’s mouth with his tongue, his hand on the blond’s nape pressing him forward mercilessly until the beta goes pliant and submissive to his alpha yet again. When they part, a line of spit connects them for a moment before snapping, and then Shinso collects the drool with his thumb before forcing it back in Ojiro’s mouth, the digit fucking slowly between abused lips for a moment or two, the beta’s eyes unfocused and dropping.
Unfortunately, Katsuki doesn’t do well with being ignored, and squirms whining in his alpha's lap like a brat. And like a brat he’s rewarded.
The loud smack of Shinso’s hand once again meeting Bakugo's thigh rings for a second, before the blond whimpers and the alpha growls in his ear to behave. Then those piercing purple eyes are once again on Kirishima and he has the strongest urge to snap at attention, but curbs it.
“Simple question, Red” he begins, like they’re talking over tea “can you keep from coming long enough to satisfy my omega at least a little bit or are you gonna pop your knot as soon as you enter him like an inexperienced pup?”
The jab makes Kirishima want to bare his teeth and snap something about how if he’s a pup then they all are, they’re only months apart from each other, but that would really make him sound like a pup and he is quite inexperienced after all, so he swallows the words and a bit of alpha pride as he answers. “I can do it, I’ll try my best, sir.” And he doesn’t know how the ‘sir’ got there, but judging by the spark of something in Shinso’s eyes, it shouldn’t have hurt.
The other alpha is slowly rolling his hips again, not pulling out more than an inch, but it looks to be keeping Bakugo content for the moment. Shinso continues his spiel unbothered. “If you’re at risk of blowing your load soon, just say so” and Kirishima’s would feel affronted if it wasn’t for the next words. “We can take care of that and then you can take your time stuffing Katsuki’s ass.” If that makes Kirishima stop in his tracks, what comes next positively freezes him. “He’s been wanting it for so long, I want him to enjoy himself to his heart content.”
Kirishima is convinced he has misheard, because sure, he’s close to Bakugo, but the blond has been with Shinso and Ojiro for something like six months now, there’s no way he’s been thinking of Eijiro, there’s no way he admitted to wanting anything sexual from him and somehow Kirishima is still alive and standing and hasn’t been brainwashed into walking towards oncoming traffic. There’s no way he’s receiving a concession like this.
But Bakugo stops his gyrating hips to pin Kirishima with a heated look. “I want to bounce on that knot, Eijiro” and his voice is like molten lava, hot and so, so dangerous, crackling at the surface from the abuse of his earlier screaming and coiling around Kirishima’s given name like a promise of terrible, incomparably delicious things to happen.
But Kirishima’s heart is in his throat, because right alongside the sultry omega’s gaze there’s the alpha burning stare, an alpha that had proven himself possessive of his partners during the last however long Kirishima has been in here, and he doesn’t understand anymore what he should do. So he does the only thing he can think of and turns for help to the one sensible person in the room, Ojiro. Who mercifully bestows upon him a full answer.
“This isn’t a spur of the moment thing, Eijiro” he explains kindly. “Katsuki really has been interested in you for a long time, and we have discussed this and we’re all ok with you being here, and with the possibility of you having sex with Katsuki. More than ok, really” he ends cheekily.
Kirishima looks upon the three of them with a new understanding splashed with a healthy dose of amazement. He can only click his mouth shut (when had it opened?) and nod.
Bakugo makes a sound like a happy chirrup before trying to wriggle up from Shinso’s lap. A hand on his shoulder from the alpha makes him drop down again with a chocked curse, and Kirishima can only stare as Shinso’s other hand starts rubbing soothing circles on the omega’s belly, applying light pressure to where his cock is undoubtedly pushing, given the minimal distension of Bakugo’s abs. Kirishima hadn’t noticed it before, it’s too small to see when looking at the whole picture, but now that he has he can’t unsee it. He can’t help but think about how Bakugo’s tiny waist would fare against huge alpha cock, and the fact that Bakugo already had been creamed at least once when Kirishima came to his room, and how he wants more and specifically from him, and it’s all nearly too much again.
But then Shinso’s voice is there, telling Bakugo to be good just a little longer, and he will have his reward soon enough, but first there’s some rules to lay out.
Kirishima’s whole focus shifts to Shinso, because he feels that this part will be important, a deal breaker if he messes it up. When the other alpha notices how seriously he’s taking the moment, he nods approvingly, and a different kind of warmth spreads through Kirishima, a warmth that keeps him centered with no risk of getting lost in his head.
“First, as before, what I say goes. If I tell you to stop, you stop. If I tell you to move aside, you move aside.” It’s not lost on Kirishima that the alpha’s quirk would leave him with no choice in the matter, and he appreciates the trust placed on him, even as he suspects that being obeyed without his quirk being involved is just as much of a turn on for Shinso. Anyway, he nods.
“Words, Red.”
“Yes, sir.” Shinso’s lips curl up and Kirishima resists the urge to puff out his chest pridefully at being the one to entice that reaction.
“Second, no biting.”
Kirishima is ready to agree but then Bakugo lets out a disgruntled sound and directs a mix of anger and puppy eyes at his alpha. “I thought we’d agreed on no biting where it counts!” and Kirishima’s eyes fly to the glands on the blond’s neck, red and puffy from being recently worried again.
Shinso’s response is a low growl. “Look at his teeth, he’s gonna maul you.” Bakugo’s answering “good” is 100% sin and an additional 60% illegal, and Kirishima isn’t good at maths but he’s pretty sure that that plus the omega’s hungry look equals his death one way or another.
Shinso seems ready to argue, but again thank the gods for Ojiro because the beta speaks up to diffuse the situation. “Alpha, let him have this, I’m sure Eijiro is conscious of his teeth, he’s not gonna hurt him. Too much” he adds the last under his breath, but Katsuki takes clear delight in it.
“Let me show you” and then Ojiro is fluidly on his feet again and in front of Kirishima, and his hands and tail are pulling him close and then they are kissing. Even as a part of Kirishima wants to take over the kiss, he lets Ojiro angle his face, pulling down his jaw with a bruising grip as he fucks his mouth with his tongue, letting his partners see everything, how his tongue glides over sharp teeth over and over without ever gaining a nick.
As the blond pulls away to show the two on the bed the entirety of his glistening, undamaged tongue, Kirishima catches sight of the twin frowns directed at the beta and makes a split second decision.
Keeping an eye out for Shinso, the redhead drags Ojiro back by his nape, using his surprise to thrust his tongue down the beta’s throat this time, denying him air for a couple of seconds before pulling back to gnaw savagely on his lips, careful, oh so careful with the pressure as the other stays stunned. He stops to admire his handiwork, tilting Ojiro’s face with his thumb to show the other pair how bruised and abused and nearly ruined the blond’s mouth looks, but without any open wound.
And then, slowly, with his eyes on Shinso and his heart beating madly, he leans in once again to let his teeth catch on the tortured lip and rip ever so slightly.
Ojiro’s breath hitches as crimson swells, before running in a rivulet down his chin. Bakugo is panting a bit, but Shinso’s gaze is unfathomable. Kirishima might have shot his chances right now, but he’s already done it, so he owns up to it.
He stands tall, a proud alpha, but his head tilts a bit in deference to Shinso, because he doesn’t forget the rules he’s agreed upon. “I know myself, I can behave, sir.”
He doesn’t expect Shinso to grin, but the alpha easily agrees to “ok, no biting on glands and no marks anywhere too visible. If anything about this leaves this room it will be on my terms” and wow, Kirishima’s mind is reeling as it shifts from ‘I’m about to be booted out’ to ‘people might one day know Shinso let me fuck Katsuki’.
“Mashirao” and now the alpha’s voice is hard and dangerous “come back to the bed.” The beta goes, suitably chastised, not even worrying his nicked lip with his tongue.
“One last thing, Red.” Shinso ignores Bakugo’s whiny “what now?!” to fix a smoldering look on Kirishima. “This is for Katsuki’s pleasure. My omega tells you to fuck him harder, faster, you do it, you understand? You leave him satisfied.”
Kirishima’s answer of “yes, sir” is breathless, but very, very sincere.
Grinning, Shinso swats Bakugo’s thigh again and the little “go get him, tiger” murmured in his hair is all the encouragement the blond needs to lift himself on bendy legs and reach forward to drag Kirishima on the bed by his hips.
The moment the omega has him manhandled onto his back, he’s on his cock like a starving man, ravenous as he chokes himself on Kirishima before licking him all over with little ‘yeah’s, ‘fuck’s, ‘finally’s interspersed through his slobbering on dick.
“Is it good, kitten?” The deep rumble comes from the other end of the bed, where Shinso is still seated with his back to the wall, watching the proceedings in front of him with intent. The fact that Ojiro is bent over his legs, unmoving with his alpha’s dick in his mouth doesn’t seem to faze him. But there are tears in Ojiro’s eyes and a warning hand on the back of his head, and from Kirishima’s previous experience with the beta’s mouth and how little cock is left showing, Shinso is very much in charge of how far down the blond’s throat he’s going to keep his dick and exactly how long he’s going to keep it there.
Kirishima’s own prick twitches in Bakugo’s hold even as the kneeling boy croaks back a “yes, alpha” before returning to his prize.
“Hmm, yet you’re still talking, Katsuki. Staying verbal is no way for an omega to spend his heat.” At the words, Bakugo freezes, and Kirishima is worried for a moment that Shinso is using his quirk before the omega lets out a low moan. “Yes, alpha.” Oh gods, is Katsuki turned on by that? Do they pretend this is a real heat and Bakugo is some kind of stereotypical, old fashioned omega who bends to alphas’ every whim?
“Yeah, kitten, alpha’s always right, and he knows how to help you. Turn around and present for our guest, would you? Omegas aren’t meant to stay on top.”
As Bakugo picks up his head and towers over where Kirishima is still sprawled on the bed, small omega fangs showing as he eats the redhead with his eyes, the words “yes, alpha” dripping from his lips like poisonous honey, Kirishima privately thinks omegas are very well meant to stay wherever they please, but he understands the game (he thinks) so he says nothing.
Then he’s righting himself to gaze upon Katsuki on his elbows and knees, back arching and eyes peeking over a bitten shoulder. His hole is open and slick and, as it winks at Kirishima, a drop of cum is pushed out of its depths to trickle down the omega’s small ballsack. He idly wonders if it’s Ojiro’s or Shinso’s.
Speak of the devil, the other alpha pipes up. “Go ahead.” Kirishima’s gaze snaps to him, but the other man hasn’t moved and neither has Ojiro. Shinso motions lazily in the air towards Bakugo. “Help yourself to that. Little bitch is so cock hungry he’s probably gonna cry if he doesn’t get his cunt stuffed again soon.”
“Hey!” Bakugo tries to protest, as if this isn’t his idea to begin with, as if he hadn’t reached behind himself with a hand at the start of Shinso’s spiel to spread his cheeks and invite even more abuse to his puffy hole.
So Kirishima gets closer on his knees, wraps his hands around Bakugo hips and he lines up with a “yes, sir” that produces shudders through the room as it comes right on the heels of the previous ‘yes, alpha’s.
Bakugo squirms a bit, not enough to be considered a serious protest, and Eijiro is sure the omega still has enough wits about him that he’d be exploded into the wall if this was a serious no. Besides, Eijiro is not clueless: the way Katsuki and Shinso are talking, the way the rules were phrased (stop if Shinso says so, give more if Katsuki wants it), it all points in one direction.
So, eyes on Shinso to make sure he hasn’t misread this, when Bakugo starts telling him to “hey! No, sto-”, he cuts him off by slamming himself balls deep in a single smooth thrust.
Bakugo’s facade crumbles just like his arms beneath him, and he’s left panting small ‘yes’s into the towels covering the bed, his walls contracting and pulsing slick around the thick cock in his guts.
Kirishima has his eyes clenched shut and his jaw locked, because for how easily Bakugo’s used hole let him slip in, he’s still tight, squeezing around him like a vice and so unbearably hot and would he get hotter on a real heat?
“Hey, Red” a velvety voice centers him again, and Kirishima breathes, and oh, Katsuki’s scent has spiked again. He forces his eyes to squint open at Shinso, who has let go of Ojiro, the beta now softly nuzzling into Katsuki’s face. They’re both checking in on them and that realization is enough to take all the bite away from Shinso’s next words. “Haven’t popped your knot already, have you?”
Shaking his head to clear it, Kirishima feels Bakugo relax fraction by fraction around his dick, enough for him to regain his tongue. “No, sir. I promised, sir” he adds with a little cheek, even as he’s still mostly breathless.
Shinso relaxes back onto the wall and Eijiro hadn’t even noticed he’d been tensed up. “Hmm, good.”
Maybe Kirishima can help reduce the tension a bit more? He unclenches a hand from around Katsuki’s hips (nothing had been said about grip bruises there, right?) and smooths it down the blond’s back, a bit to soothe him and a bit just to feel up those amazing muscles he is finally allowed to touch. “It’s just, your omega feels so good, sir.” Nothing wrong with using the truth to stroke Shinso’s (and Bakugo’s) ego a bit, right?
Kirishima’s assessment is very right going by the collective contented sigh that follows his words, and then Shinso’s talking through a chuckle. “Yeah, ain’t that true...” He smiles benignly upon Bakugo as the blond gathers himself enough to lift his head. Of course it’s all a travesty, because as soon as Katsuki’s eyes meet his, he’s saying “Fuck him up, Eijiro” right through that soft look. And even as Bakugo’s breath hitches and Kirishima’s cock jumps at the use of his name, he’s already pulling his hips back, the words “yes, sir” tumbling from his mouth automatically.
There’s no real build up. The pace starts hard and fast, only to become harder and faster as soon as Kirishima gets the right angle to make Bakugo scream on every thrust. Only, the omega keeps squirming around and messing up his aim, and something dark that Kirishima didn’t know he had before today finally uncoils inside of him.
His hand lands heavy on Bakugo’s backside and the blond jolts and clamps down, but the wave of slick that comes with the clenching eases the friction enough that Kirishima doesn’t have to slow down at all. “Do you want your sweet spot pounded or not?” He would be surprised by the low growl he’s speaking in if his concentration wasn’t entirely on how to push Katsuki exactly where he wants him so that the two of them can enjoy this to the fullest.
When the omega doesn’t respond, too lost in writhing in pleasure on the bed, Kirishima swings his other hand. “Answer me!” The crack of calloused skin on soft cheek is loud, but not as loud as Bakugo’s inarticulate wail. “Y-yeah, ah! Please!” The begging from the usually bristling omega mollifies something in the alpha, but not enough to distract him from his previous thought. “Then stay still, you stupid bitch!” And with that, one of Kirishima’s hands pushes down between Katsuki’s shoulder blades while the other hoists his hips up higher, knees no longer properly on the bed and Bakugo loosing all leverage.
A sound from the foot of the bed has Kirishima snap his gaze up, but even as he worries he overstepped some boundaries he doesn’t stop. He hasn’t been told to.
He shouldn’t have worried because, as it is, it was simply Shinso enjoying the show. He licks his lips as he says “I didn’t think you had it in you. Good job, Red.”
And if Kirishima’s hips speed up just a little more at the praise, nobody comments on it. After all, Bakugo is nearly beyond words and Shinso hasn’t stopped his hips either, where they’re pumping up as his pushes Ojiro’s head down, the blond just drooling on the shaft in his mouth while his glazed over eyes stay unfocused on Katsuki getting plowed by Kirishima.
Eijiro gets confirmation that yes, apparently Shinso uses his quirk in the bedroom, too, and that his control really has gotten better, for he may not be fucking him too rough, but that’s definitely the alpha’s cock making Ojiro’s throat bulge on every stroke, yet the beta’s eyes never blink or sway from the pair fucking two feet from him.
Kirishima gets over his distraction to focus back on ramming Bakugo’s ass, but soon enough a whine makes his hips stutter to a stop.
“Hurts...” Katsuki is mumbling into the bed, even as his hips try to coax Kirishima back into fucking him, but Eijiro is scared, not even for some stupid breaking of rules, but because if he’s hurt Bakugo, well… he’d take dying at Shinso’s hands ten times over hurting his friend this way.
Speaking of Shinso, Kirishima is ready to call him for help but the other alpha is already there, hand caressing soothingly through Katsuki’s sweaty locks to make him look him in the eye. Ojiro has been freed and is on Bakugo’s other side, silently offering comfort while not distracting him from their alpha, but Eijiro feels his thick tail settle behind his back. The extra touch coupled with the knowledge that that tail can offer a very real support is enough to make him breathe a little lighter.
As he does so, he doesn’t smell omega’s distress or fear through the air. No, the arousal is still very much present, even if touched with a bit of discomfort.
That’s enough to make him focus back on the conversation happening under him, just as Bakugo’s answering Shinso’s question of where he’s hurting with a mumbled “chest”.
Shinso surprises him yet again by throwing his head back laughing, and even Ojiro is silently chuckling as his tail sways behind Kirishima. Shinso actually wipes a tear from his eyes when he recovers from his laugh. “Man, you’re really giving it to him good, eh Red?” he says, before proceeding to plant a kiss on the corner of Eijiro’s lips, who’s really too stunned to respond in anyway.
Katsuki is whining again in the bedding, and Ojiro’s chuckles become fond as he asks “Should I lift him up?” and gods, his voice is so wrecked.
“Yeah, sure” Shinso’s answer is lighthearted, even as he pets lovingly at… at Kirishima’s handprint on Bakugo’s ass cheek. “Let’s show our Riot what’s happening to Katsuki.” And Eijiro’s head spins as Shinso’s hand migrates from the omega’s hips, across his, to land on the small of his back just as Ojiro retracts his tail to help him balance Katsuki upright without Kirishima’s cock ever leaving his ass. There’s too much happening but the hand on his back is firm and his mind grappling for anything decides to hold onto two words that go on loop through his brain. Our Riot.
It’s always the same voice that yanks him out of his spiraling thoughts. “You see, Red,” Shinso is close, so very close to his ear, but he’s clearly narrating for them all, “when Katsuki here is in phantom heat, sometimes, when he gets railed really, really good,” and oh gods, was… was Ojiro pushing down on Bakugo’s belly?? Did everyone get sadistic by being around Shinso??
“Well, sometimes, his tiny, stupid omega brain decides that if he’s getting fucked through the mattress of course it means he’s gonna get pupped.” The words make Kirishima’s hips snap forward just as Katsuki releases a high pitched noise and Ojiro presses once more on his belly, the solidity of his hand a perfect counterpoint to Kirishima’s cock pushing into Bakugo from behind.
“And of course, if he’s gonna give us puppies” Shinso’s voice is too close, and Eijiro only now realizes the other man got behind him, and Kirishima might be broad, but Shinso is so tall, it’s like he’s enveloping him, especially now that his hands trail down his arms to interlock fingers together, bringing their hands around to touch Bakugo’s pecs, “then he’s gonna need to feed them.” And with that, he squeeze both of their fingers down on Katsuki’s swelled chest, making the blond positively wail and convulse.
Ojiro looks like the cat who got the cream. “Was that a dry one?” he croaks, Eijiro’s mind helpfully coming up with a little chant of dry orgasm to go with the blond’s words.
Shinso disentangles one of his hands to pet his head. “Who knows if we’re already there” he tells him fondly.
The beta just beams at the prospect, while his own hand goes from Katsuki’s belly to his small prick, stroking it calmly, ignoring the omega’s writhing. Kirishima tightens his fingers instinctively to stop him, once more squashing his sensitive pecs, resulting in Bakugo choking on his own spit and letting his head fall back on the redhead’s shoulder.
Kirishima now has an unobstructed view of the blond’s front, from the mounds in his hands, to the abs he can slightly see himself pushing against, to the angry red cocklet still hard in Ojiro’s grip. “He’s already come at least once with Eijiro in him, you know” the beta is saying, and yes, right underneath Bakugo there’s a small puddle of cum and Kirishima can only marvel at it.
“Hmm, very good.” Shinso’s pleased rumble is right in his ear and, oh gods, he is nipping at his lobe, and it should be wrong, the alpha in Kirishima should only roar at the prospect of someone’s teeth so close to his neck, but while sirens are going off in his reeling mind, the only thought that keeps ringing loud and clear is a hysterical “Mark me down as scared and horny!”
Then the taller alpha lets up and Kirishima draws a breath as he hears “well, Mashirao, work those tits”, but then “and you” and it’s Kirishima’s turn to yelp and jolt as a light smack lands on his ass, “plow that cunt, Red.” Shinso moves to get in front of the show yet again, but not before promising darkly to Katsuki “Time to get this bitch round and swollen.”
Kirishima is frozen still for a moment. That’s just dirty talk, right? Over Bakugo’s shoulder, he catches Ojiro’s eyes. The beta smiles reassuringly, winks, then latches onto Katsuki’s right nipple through Eijiro’s splayed fingers and sucks hard. Kirishima feels the pec under his hand follow the suction, but more than that he feels Bakugo trying to escape the stimulation by moving backwards, grinding himself down on the alpha’s cock.
All thoughts are shoved aside for a while in favor of primal fucking, Kirishima’s hands moving to Bakugo’s waist and squeezing every time he slams up into him, while Ojiro ruthlessly attacks his chest with lips and teeth and fingers.
As Katsuki’s cries get higher and higher, Kirishima suddenly remembers something that was discussed earlier. He looks for Shinso and finds him unsurprisingly at the foot of the bed, enjoying the view and lazily rubbing his hard on on… oh, Ojiro’s tail. Well. No matter, Eijiro has the other alpha’s attention and that’s enough as he cautiously lowers his head to lick over the meaty part of Bakugo’s shoulder, before resting his mouth there.
Shinso’s grin is a little scary as he catches on and gives permission. “Pinpricks like Ojiro’s lip” he concedes, and Eijiro looks down at the beta who grins devilishly with pearly teeth around an abused nipple.
Kirishima wastes no more time then in opening his jaws, setting jagged teeth upon and lightly into Bakugo’s skin. What he doesn’t expect is for Ojiro to chomp down on an entire pec at the same time, or for Katsuki to actually shoot his load from the rough stimulation.
Eijiro doesn’t want to stop but Bakugo has slumped back exhausted and he doesn’t want to overwhelm him, even as Ojiro is once again licking his stomach clean and praising him, saying how good an omega he is to give his mates all of that sweet milk.
“Have I told you to stop?” Shino’s voice cuts once more through Kirishima’s vague thoughts like sharp steel, and he fishes back his tongue from wherever it was buried to answer. “No, sir.”
“Then, you don’t” the alpha says smiling, before calling Mashirao to him.
Katsuki is lax and loose in Eijiro’s lap, and he’s so hard and ready to burst, but still he has to ask “Uh, sir, is it really ok if I...?”
“Go on” incites him the other alpha, seemingly uncaring even as he has positioned Ojiro between his splayed legs, the blond made to seat on his own tail, one of Shinso’s hands pushing down the beta’s dick to rub against the extra limb while the other pumps three fingers in his mouth. “Katsuki needs the phantom heat fucked out of him, more or less. The longer he has to recuperate, the longer it’s gonna last.”
Kirishima’s eyes go wide. Was that really a thing? He’s lost count of how many times Bakugo has already come, and he’s arrived when they’d had at least couple of rounds, he’d say. Could it really go on for much longer?
As Katsuki head rolls back up (mostly) and the omega tries to blink his eyes into focus again, Eijiro decides he doesn’t want to risk it. He wraps an arm around the blond’s chest to stabilize him, braces his hips with his other hand as he pulls them both slightly higher on their knees.
“Wha-?” is all that Bakugo has time to articulate, before he dissolves back into wordless moans as Kirishima pistons into him, the redhead foregoing all finesse as he only worries about nailing the omega’s prostate and getting off, off, off.
Ojiro comes all over his tail just as Kirishima feels his knot starting to catch on Katsuki’s asshole, and thought crashes back into him as the omega starts a garbled chat of “knot, alpha, please, breed”.
His fear is twofold, but the only one answer is always Shinso. For once, the other alpha doesn’t look unruffled when their eyes meet, before Shinso’s stray down to the place where his omega is getting dicked down by someone outside their triad.
“Stay inside him. Fill him up.” The command is rough and tempting, but the alpha’s permission was only one of Eijiro’s worries and he tries to communicate the rest, though it’s mostly whining imploringly while pawing at Katsuki’s belly.
Shinso snorts. “He is on birth control, stupid, that’s why he has phantom heats and not real ones.”
Kirishima’s eyes go wide in understanding as he nods, and finally lets himself go completely, thrusting and thrusting until his knot gets stuck and he comes with a roar, teeth itching to claim, but he settles for Katsuki’s jutting shoulder blade, still careful not to do damage as the omega in his arms shakes apart again, the tiniest spurt leaving his spent cock.
They’re panting heavily on the bed, and Kirishima is vaguely aware of it dipping this way and that as Shinso and Ojiro move them to lay down on their sides, taking away the messiest towels and supplying mouthfuls of water.
He comes back to full consciousness as he feels Bakugo starting to get restless, and peering over the blond’s shoulder reveals his small cock trying valiantly to get up once more, even as the omega is still tied to him and still not awake.
His face must be a picture of his astonishment because it garners him two amused chuckles.
Ojiro is the first to come into view, swiping back ashen blond locks to plant a kiss on the omega’s forehead, getting a scrunched up nose in reply from his unconscious partner. “He really is quite something, right?” and yeah, totally, but Kirishima has lost his tongue again so he can’t answer the beta with anything more than a nod.
Next is Shinso, who inspects Katsuki closely. “This should be the last round” he concludes, before stretching over the pair of them to lean closer to Kirishima. “Don’t worry about the insatiable little minx, ok? You performed admirably, Eijiro” and then… Then Kirishima is being kissed by another alpha and not only he lets it happen, he revels in it, opening up to the tongue that slowly entangles with his. Nothing is forceful about that kiss, and not once does Kirishima think to dominate it. It’s sweet and it flows, right up until the moment when the knot goes down enough that Katsuki manages to detach himself with his grizzling.
Then Shinso sighs, bops Eijiro’s nose with his own and pulls away, shushing Bakugo gently as he moves him so that he is on his back between Kirishima and Ojiro, who’s already providing a couple of pillows to stuff under Katsuki’s bottom.
Shinso rewards the beta with a kiss and a ‘thanks, love’, before he slides, easy as you please, right home into Bakugo’s ass. Kirishima would have been worried if this had happened hours ago, or if he weren’t seeing the omega calm down as soon as he feels himself being fucked again, but as it is, he is getting used to expecting the unexpected and to trust that these three people know each other well enough to already be aware of where their limits are.
So he lets himself relax and enjoy the picture, finally able to focus enough to see the small pouch that now decorates Katsuki’s stomach, a pouch of cum he’s contributed to and that is now being moved by Shinso’s slow, deep thrusts. Bakugo looks ruined already, limp and impaled again on cock without him even knowing, his chest puffy and abused, bitemarks littering his skin, and mouth parted on unconscious, silent pants. But then he starts squirming again.
Shinso picks up the pace, still keeping his thrusts deep, sometimes rolling his hips into Bakugo’s ass to make sure to grind hard into his prostate. Katsuki is mewling on one push and blinking his eyes open on the next, alert for a moment before he identifies his boyfriend above him and lets himself drown back into the pleasure.
“’Toshi” he begs, making grabby hands at his alpha, who promptly bends to kiss him gently but purposefully.
Even as the omega’s arms wrap around his shoulders to keep him close, even as his pace builds to fast, hard slams that jolt Katsuki’s body up the bed, Shinso never changes the soft care of the kiss. It feels too intimate an action to watch and Kirishima averts his eyes, wondering when he should start looking for his clothes to leave.
But then he feels a tuft of fur tickling his thigh, and when it doesn’t move away, just flicks gently against his skin, he convinces himself it is not a fluke, and looks across the love making pair (he has no other words for it, for that’s what it is despite how rough are they are being) to Ojiro. Ojiro who has draped his tail across Shinso’s calves to reach out to Kirishima without disrupting the moment, and is now smiling at him serene and, and… welcoming, accepting, inviting.
His eyes stay locked with Ojiro’s even as the two between them get louder and frenzied.
Finally Shinso dives down to bite Katsuki’s neck, the omega’s shout overshadowing the alpha’s grunt as he finally knots him. It’s almost poetic how they stay locked into position until Bakugo slips into unconsciousness back again and, like a switch, Shinso uncoils completely too.
He still takes a moment to look at his omega, who should be happily sated at last. He does chuckle tiredly in Ojiro’s direction as he notices that “that was a dry one”, before slumping bonelessly down.
Ojiro snorts at the words, before directing Kirishima to help him rearrange the tied pair. Just because Katsuki doesn’t get squished easily, it doesn’t mean they should leave anyone uncomfortable and threaten to cut their post-coital nap short.
As he lays down to spoon the omega, Mashirao takes care to curl his tail to touch Eijiro’s leg again, wanting to make sure the redhead bracketing the other side of their little quartet knows that he’s welcome to stay there for as long as he’d like.