"What the fuck?! Are they fighting again?"
Katsuki ignores the dumb question from the extra because, of course, he and the purple-haired fuck are at it again. His stupid face is just begging for Katsuki's claws to shred him like paper.
"It's hardly a fight. Bakugou isn't big enough to ride this Alpha ride," Shinsou snaps in Katsuki's direction, his eyes flashing Alpha red in his agitated state.
That has Katsuki tackling him in an instant, bodies colliding with so much force they knock several people over who have gathered around them. They are growling in each other's faces and gnashing their teeth as clawed fingers dig into skin and rip clothing. It takes at least two other Alphas and a handful of Betas to pry them off each other. Everyone mumbles about them constantly fighting and needing muzzles if they're gonna act like animals during school hours.
The fighting started their first year and only grew worse the longer they were in contact. It's to the point where any time Katsuki and Shinsou are even remotely close to one another, they fight. It's almost always bloody and only gets worse once the violence escalates, because it always escalates.
Katsuki spends the rest of the day in a foul mood that has the rest of his classmates and even a couple of his teachers covering their noses from the scent of anger coming off him in waves. By the time they are released, Katsuki is desperate to get out of the building and away from everyone and everything. He needs to run, to sweat and feel his muscles working under his skin to alleviate the fire burning fierce in his gut. Yeah, that's what he needs.
There is a trail that lines the UA campus made specifically for pent-up Alphas. There's nothing worse than a teenage Alpha with anger issues, and UA is full of them, Katsuki being number one on that list, depending on who you ask.
Katsuki changes into workout sweats and the first tank top he could find and makes his way to the wooded part of the running trail before most of his classmates have even returned to the dorms.
The trail starts just in front of the dorms and wraps around the outer perimeter of the campus. It's five miles long, and on a good day when he's not this worked up, Katsuki can run it at least four times with no effort at all. With how he feels today, there's a good chance he'll run it until his legs give out or someone comes to get him when the sun goes down.
By the time he hits his third lap, Katsuki's lungs are screaming with how hard he's running. He's dripping sweat and sucking in ragged breaths from the exertion, but, fuck, it feels good to be moving. He's heading into the thickest part of the trail, trees on either side of the running path that block out all view, when he gets sidelined out of nowhere and launched into a thick patch of bushes.
Katsuki lands on his back and immediately flips into an attack stance because whoever did that shit is getting their fucking throat ripped out with his teeth. It takes a second for Katsuki to realize who it was that slammed into him in the first place.
"Hey there, little Alpha." Shinsou grins, all teeth and narrowed eyes as he walks through the thick brush with confident strides. Katsuki wants to snap his teeth like a stubborn pup at the little Alpha comment. Katsuki isnt small, Shinsou is just ridiculously tall by comparison and likes to taunt the shorter Alpha whenever he can.
"Fuck off, dog breath," Katsuki growls in warning. But Shinsou is already walking into his space like he belongs there. Like Katsuki should be thanking him for allowing the other Alpha to exist in his presence.
"It's so cute when you bark like that, makes it so sweet when you present for your Alpha."
Katsuki takes the bait like he always does and launches himself, full-body into the taller Alpha. They hit the ground, and Katsuki instantly goes for the throat. But he's thwarted when Shinsou knees him in the ribs, those long legs wrapping around Katsuki's thighs to hold him in place.
"And you call yourself an Alpha. Only a bitch would lose so easily. Are you even trying, little Alpha? Or should I say… omega?" Shinsou taunts, voice calm even as he locks Katsuki in place with his legs.
"I'll fucking kill you!" Katsuki roars, fangs on full display as his eyes glow red with his anger. He's bucking and lashing out, trying to escape Shinsou's hold. He manages to free himself long enough to tear his claws into Shinsou's leg with a satisfying roar from the larger Alpha. There's blood soaking his tattered pants and the earth beneath them, and the two of them are full-on brawling again. Claws and teeth and animalistic ferocity that has absolutely no place in civilized society.
Katsuki lashes out with his claws again, and Shinsou dodges it with a counter of his own that lands Katsuki face-first in the dirt with Shinsou on his back, both arms pinned behind his back.
"Far too pretty to be an Alpha," Shinsou growls into Katsuki's neck. "My pretty omega presenting just for me."
Katsuki tries to fight, to break free of the hold, but he can't budge with Shinsou's weight above him. He's panting into the ground, growling in warning when Shinsou fits himself between Katsuki's legs and starts grinding his growing erection into Katsuki's ass.
"It's like you're not even trying, Bakugou. Does my omega want my cock that badly?" Shinsou laughs and Katsuki roars.
"FUCK OFF!" Katsuki is full-on struggling, kicking and digging his blood-soaked claws into Shinsou's arm where he can reach even with his arms pinned. But Shinsou isn't bothered. He uses one hand to hold Katsuki down while the other shreds his sweats.
"I can smell how much you want it. Can smell the precome leaking from your cock and the lube you used to fuck yourself before school this morning." Shinsou wraps his hand around Katsuki's dick, and Katsuki can't stop the way his hips rock into the tight fist. "Did you use the dildo with the fat knot at the bottom? Hmm? What kind of Alpha craves a knot?"
Katsuki doesn't hear Shinsou open the lube he must have had stashed in his pocket, but he feels the ice-cold liquid as it's squeezed messily between his cheeks. It pools over his hole, and Katsuki shakes as Shinsou pushes two fingers in without hesitation.
"I know you fucked yourself on a fake knot this morning," Shinsou snarls as he fucks Katsuki with two rough fingers, the hand securing his wrists tightening until Katsuki is panting from the pain. "I know you came with that knot locked in your tight little ass while you milked your own for all it's worth."
Katsuki fights off a moan by pushing his face further into the dirt. He refuses to give in so easily, even if his body hasn't gotten that memo just yet.
"So, I'm gonna give my pretty little omega the real thing and watch how you come on it."
Shinsou sounds so fucking satisfied, so proud of himself, that Katsuki wants to rip his dick off. But, every time he calls Katsuki an omega, his own dick throbs. It pisses him off so much, but he can't stop himself from pushing back against the fingers in his ass, humiliation pooling with the arousal burning through his gut.
"Fuck! You bastard!" Katsuki screams, but Shinsou just ignores him.
The purple-haired Alpha is far too busy using the excess lube on Katsuki's ass to slick up his own cock. Katsuki can hear it, the wet sloppy sounds of Shinsou's hand around his dick and the filthy way it squelches when he rubs the head of his cock over Katsuki's hole.
"Next time I'm gonna tie you up so I can take my time. But can't risk getting caught with you like this. Other Alphas might come running if they see something so pretty laid out for the taking."
Shinsou sinks in, cockhead to base, in one fluid motion that has Katsuki moaning so loud he's positive someone is going to hear them. He's not even fighting anymore, his entire being hyper-focused on the point where their bodies are connected by Shinsou's dick. He's thick, his cock stretching Katsuki more than any dildo he's ever used. Every stroke has Katsuki shaking, cock leaking heavily between his legs.
The other Alpha is all fangs and claws and possessively stroking Katsuki's naked body as he sets a brutal pace that leaves them both breathless.
Katsuki isn't trying to keep quiet anymore. He's being impaled on a thick Alpha cock, and, while his own Alpha is screaming in his head that this is wrong, that he should be fighting, his dick is leaking into the dirt. Katsuki can't help but whine like an omega bitch in heat. He's so full and it feels so good.
Now that he isn't struggling, Shinsou releases Katsuki's arms. They are both far too into it to stop now. Shinsou forces Katsuki to arch his back, chest pressed firmly to the ground so his ass is presented just the way Shinsou wants. The Alpha is fucking into Katsuki with an animalistic drive that has the blonde seeing stars and choking on moans as his body is forced to take a cock it wasn't made to.
"Gonna take my knot so well, pretty omega. Gonna be so tight and so fucking hot."
Katsuki keens, high and needy and sounding far too much like an omega for an Alpha. It has Katsuki frozen beneath Shinsou, the Alpha just as stunned as he is.
"D-do it again. Fuck, make that noise again for me, Bakugou. My pretty omega, whine for your Alpha again," Shinsou growls, deep and frenzied against Katsuki's ear. He's taking Katsuki with brutal, barely contained thrusts until even Katsuki can't stop the sounds being pulled from his throat. He keens and whines and moans like a whore in heat while Shinsou fucks into him, the Alpha's knot already beginning to catch around Katsuki's abused rim.
"Knot, fuck! Knot me, Shinsou. Yes!" Katsuki demands as he slams his hips back to meet every thrust.
It takes one savage thrust that knocks the air from Katsuki's lungs for the absolutely huge knot to pop past the tight ring of muscle and into Katsuki. It hurts, the pain unlike anything he's ever experienced, even in combat. But, the second the knot is inside and Katsuki can feel Shinsou coming, can feel how full he'll be, he's coming on a pain-laced scream all over the dirt under him.
His own knot swells and Katsuki is tightening his fist around it to extend the greatest orgasm he's ever had. Shinsou is above him, breathless and looking at Katsuki like he's the greatest thing he's ever seen.
"I told you, I told you, you could take it, Bakugou. Fucking perfect. Better than an omega."
"Shut up." Katsuki is too tired to smash the purple-haired Alpha's face in, but as soon as his legs work, Katsuki is gonna break his legs.
Shinsou is purring, a deep rumble in his chest that sends vibrations all throughout Katsuki's body. "Even you can't hate me after that. Enjoy it for a moment before you plot to kill me."
"Fuck you, Shinsou," Katsuki groans, ass squeezing around the knot still inside him.
"Maybe next time."
It takes faaar too fucking long for Shinsou's knot to go down enough for them to split apart. When it does, Katsuki is left with a gaping hole and come leaking everywhere. Shinsou won't stop grinning, and Katsuki finally gives into the urge to smash his face in.
They change into new clothes (Shinsou was smart enough to bring extras this time) and Katsuki limps back to his dorms, Shinsou trailing right behind him with a black eye and a broken nose. They immediately hear an exasperated sigh when they make it into the common room.
"Did the two of you get into a fight again? What was it this time?" All of their classmates look fed up, and Katsuki ignores them in favor of heading upstairs to take a shower. But he does catch Shinsou's grin before the elevator doors close.
"Told the little Alpha he still wasn't big enough to ride the ride. He just had to prove me wrong."