I got hit upside the head by this idea so I'm gonna make it a small thread to get it out of my system. Might expand later if ppl think it'll be a cool world they'd like to see!

ALRIGHT HERE SO GO

ABO || #BakuDeku || Pro-fighter AU || "Total Knock Out"
O!Izuku/A!Katsuki

Katsuki is an Alpha professional MMA fighter who is looking to for an adrenaline rush because he can't seem to find any extras in the professional leagues that can give him a challenege.

He's been on top since his debut all the weak ass alphas that keep getting sent his way by his coach All Might (past champion) are weak by his standards. He needed someone who had passion and something actually real, and these steriod asshats weren't it

He's complaining to his best friend, Kirishima one day who is the #2 top fighter in their weight class one day when the redhead lets something interesting slip out of his mouth. But Kirishima quickly backtracks and tells him he has to swear to secrecy. So Katsuki did.

"What's so goddamn secret Kiri?" Katsuki mumbled, looking at the other fighter like he had grown a second head. "You're acting like you found the lost city of Atlantis."

"Heh, well...I kinda have?" The idiot gave him a goofy grin and only led his curiosity more.

"There's an super secret ring that some pros participate in underground Tokyo--BUT it's super locked down, bro!" Kirishima continued and Katsuki could feel the hairs stand up on his arm.

"The fuck? People are actually doing that shit you see in the movies?"

"Yeah! But you can only get in through connections or if you drop hella cash. You gotta drop even more cash if you wanna actually enter the competition. Winner takes home 20% of the profit from the week."

Everything set his skin on fire thinking about it.

Underground fighting? He should say fuck that and that he was better than that shit because he was a pro and didn't make it this far on dirty ass fighting.

But then he thought about the alpha he easily TKO'd without an issue less than an hour ago.

"Fuck it. Where do I sign up?"

Kirishima drags him to this sketchy ass alley that gave way to even more sketchy ass warehouse building on the outskirts of the city. The lights flashed purples and the music was a deep bass that filled his bones with vigor

The second he stepped in, everyone immediately recognized him and everyone immediately wanted a shot to knock down the top fighter in the league.

Oh hell yeah, this was what he needed. He watched from the sidelines waiting for his match. Majority of the contestants were betas

He figured as much, Betas didn't stand too much of an chance in the leagues, fighting still being a mainly alpha dominated field but these motherfuckers looks absolutely /vicious/. One by one they fought, scraping for blood and Katsuki could feel his alpha stiff at the primalness

Stir*

When it was his turn to step into the ring he was expecting to be matched up with another alpha or at minimum a beta. The crowd was going wild and people were shaking the ring, making Katsuki give a feral grin at who his competitor was

"Everyone give a warm welcome back to the crowd's favorite!" The announcer's voice rumbled and everyone started chanting. "The one, the only, ALPHA SLAYERRR!"

"Alpha slayer?" Katsuki parroted and out walked the sexiest son of a bitch the pro has ever seen.

He was build like no one he's ever seen with thighs muscular enough to crush several men's skulls at once and honestly probably start a few goddamn wars while he was at it.

Fiercely brazen green eyes raked over the crowd as he waved to his underground fans and his dark green curls bounced in a fucking gorgeous manner. His six pack showed from underneath his crop top and his shorts left little to the imagination. Katsuki was dumbstruck.

Then thats when he smelled it: Thick, sweet and like cinnamon amongst all the musty smells of the alphas and betas crowding the dimly lit underground setting.

This man was a fucking omega. Katsuki felt his nostril flare in irritation. He wasn't about to fight a goddamn omega

"I ain't into hitting omegas," Katsuki called out annoyed to the referee. "Is this a goddamn joke? Do you know who I am?" He came here for a challenge not to be made fucking fun of.

"Aw, c'mon Kacchan. I promise I'll go easy on you." The omega taunted at him & the crowd laughed

"Who the fuck are you calling Kacchan?"

"You, Bakugou Katsuki." The omega smirked, circling him. "Top in the league at the moment, no can seem to knock you down a peg."

"You fuckin' stalk me or something?"

"No, just a big fan." A sickly sweet smile was flashed his way.

"Whatever, lets make this quick, Deku." He hissed, taking his stance. The omega smiled at him like this wasn't about to be a fight as he bounced lightly on his toes.

Katsuki would be lying if he said he wasn't half checking him out. The man /was/ a total fucking knock out.

The bell rang and before Katsuki could even put his hands up the green omega moved quicker then he could've ever imagined. Thick thighs snapped around his neck, knocking him down to the ground and immediately he felt a punch to the face.

Everything went black.

Cold water splashed on his face and the first thing he heard was Kirishima's annoying ass laugh as a hand tried to slap him awake.

"What the fuck happened?"

"DUDE!! YOU GOT KNOCKED OUT!" The redhead was doubled over, clutching his stomach.

"All the shit you talked and you got knocked the fuck out!" More laughter and snickers came from the betas and alphas surrounding him but Katsuki didn't care. He /actually/ got knocked out. He smiled through his dried up bloodied nose.

Fucking finally.

"Where is he?"

Katsuki searched the whole goddamn place for the Omega but couldn't find him. Turns out he was knocked out for the remainder of the goddamn competition and 'Alpha Slayer' had won this weeks earnings and left out the back door last any one saw him.

"Izuku has a chip on his shoulder, you should be mindful when you talk to him," a shady man told him. "Ain't too found of cocky ass alphas."

He waved the man off dismissively but silently thanked him at the same time because at least now he had a name: Izuku.

He ignored all of Kirishima's calling after him. His alpha was demanding that he chase after this man and when he finally caught up up the green haired omega waiting at a bus stop he was nearly out of breath.

Green eyes looked at him curiously "What bring you here, Kacchan?"

"If you're just going to spew more sexism I don't wanna hear it-"

"-Let me fucking coach you." He quickly said, stunning them both. Why had he said that? He had no fucking clue but the longer he looked into those pretty ass eyes he just knew this couldn't be the last time

"E-Excuse me?" Izuku reeled his head back.

"Don't make you fuckin' repeat myself. I said let me fucking coach you. Do you know how many damn idiots couldn't knock me out in the last five years? And you did it in less then five fucking seconds?"

He stepped closer to the omega, his natural smell perfuming the area through the sweet sweat that had gathered on his skin. He watched carefully as the Omega's stance stayed defensive but green eyes flickered something else there.

Something close to want if he ain't know better

"Okay fine," the greenette replied, stunning them both yet again. They both felt a pull there they couldn't explain but Katsuki wasn't about question anything right now. He was still stunned that he had even gotten knocked out in the first goddamn place /by/ a total knock out

"What's your name?" He asked carefully, his own red eyes locked onto green ones.

"Izuku," the voice softly replied. Holding out a hand. "Midoriya Izuku."