CW: NSFW, a/b/o, O!Kiri, A!Baku, biting, feral behavior, posessive behavior, marking

They weren't mated. Too busy being heroes and mating often involved pups and dealing with more intense heats and ruts and they didn't have time for that.

But Eijirou wished they were now.

Mostly because Katsuki's stupid agency decided that he needed an "omega escort" when attending events.

Bitch please.

And oh the fucking omega they chose! A tiny little thing with big hips and big eyes and pouty lips and everything that Katsuki hated.

And fuck them.

But here they were, attending this stupid event as just friends and colleagues.

Eijirou didn't mind that part

BUT EVERY TIME THAT DAMN OMEGA GIGGLED AND BATTED THAT FAKE EYELASHES AT HIS ALPHA-

Nope. Be cool. Be cool. Calm and collected.

And hide the broken glass from Fatgum.

All night he had to deal with that stupid omega hanging off his alpha.

He even overheard someone asking if they were going to mate!

Two glasses were broken cause of that.

It just fucking hard cause most of their friends and bosses knew they were together but the public didn't.

But he breaths, gets a fourth glass and chats with friends and other heroes. Tries to ignore that knife to the ear giggling and focus on catching up with Sero and Todoroki now that they've mated.

Tries being the operative word.

"We definitely want lots of pups! The more the better! Tee hee hee!"

That's it.

Eijirou is up on his feet and across the room before now brain can catch up with his body.

But all he can think is 'Mine. Alpha mine. Alpha mine. Claim. Claim. CLAIM.'

In fact he roared it in the omega's face after forcing Katsuki behind him.

The room was pin drop silent.

The omega, once over their shock, tried to posture back but facing down Eijirou is not an easy thing to do, especially when he's on the edge of feral.

"Mine." He growled before turning on his heel, grabbing his alpha's are and dragging him away.

Thank God they had on patches because Eijirou knows his alpha would be reeking of arousal.

Well, he probably is too under the anger and posturing scents.

"Ei. Ei. EIJIROU WILL YOU ST-"

Katsuki was surprising calm about this but whatever he was going to say was cut off by Eijirou whirling around, grabbing his shirt, ripping it open and biting down on his shoulder.

Hard.

They weren't even out of the ballroom yet.

"GEEZ FUCKING- EI- WHAT THE HELL!?"

Now, Katsuki was short for an alpha and Eijirou was tall for an omega but it worked out where they were around the same height, the Eijirou was a bit bigger in muscle cause he was, ya"know, a tank and Katsuki was more streamlined.

And because of this Eijirou could easily let go of the bite, admired the red mark of teeth on pale skin before bending over and throw his alpha over his shoulder and walk out of the ballroom. His hold firm and steady even as the alpha started squirming and growling.

But the only thing that Eijirou could think was 'Mine.'

His omega was chanting it over and over and he knew he wasn't going to stop until his Alpha was his and his alone.

Even if that meant he had to bite every inch of him.

Thankfully the event gave them hotel rooms. Separate rooms.

It didn't have their full nest, just the one he had quickly made early by scurbing the blankets and pillows on his neck but he honestly didn't care as long as his alpha was surrounded by his scent.

It just a quick elevator ride and a jog down the hall to his room. At some point Katsuki stopped squirming, seemingly accepting his fate. After three attempts of putting the fucking card in the slot the correct way and not taking it out too fast or slow the door finally unlocked.

The door was kicked shut behind him though he didn't have to do so and once they were finally alone Eijirou threw his alpha onto the bed and mounted him.

Hardened claws closed around callused fingers and palms as the kiss they shared was more teeth then lips.

But Eijirou wanted to smell his alpha, he wanted to smell what he was doing to his alpha (he could already feel it but that wasn't important) and he wanted to taste his alpha.

So he pulled away from the kiss and removed his claws from smoking palms and ripped the patch off.

"MOTHERFUCKER! Ei what the-" Katsuki's words trailed off with a gasp as Eijirou's lips locked around his scent gland, tongue lapping up newly freed oils that tasted like chili spiked caramel.

Eijirou moaned into the meat of his alphas neck, teeth digging in just enough for him to feel the tension of the skin and muscle underneith but not hard enough to pierce.

When the left side was starting to give out, he switched, once again ripping off the patch and diving in.

Katsuki didn't even complain about the fine hairs getting ripped off with the adhesive, to focused on his omega, unconsciously grinding their hips together as he lapped up his fill.

He hands were shaky as they gripped into his omega's back, pulling at his clothes.

"Ei...Ei fuck..."

But Eijirou didn't stop at his words, just sucked harder at the flesh trapped between his teeth.

Katsuki managed to untuck the omega's button up from his suit pants and slip a hand up the shirt just in time to claw at his back as the first bruise formed.

"Ei...omega...off...off..."

That got Eijirou to stop.

He pulled off the scent gland and grabbed his alpha's arms, slamming them back into the mattress.

Upper lip pulled back in a snarl, ruby eyes left with just a ring of red as he glared down at his alpha.

"No. Mine."

Katsuki nodded, "Yours omega. I meant clothes off."

Eijirou blinked, then nodded before sitting up and ripping the already torn shirt from the blond's body.

"Ei! I meant you- fucking hell what-"

The omega licked his lips. There was so much pale skin for him to mark now.

He went for a pec first, scooting his knees back so he was laying on top of his alpha as he locked his teeth around firm muscle and sucked on a pale pink nipple.

"Ei! Sto-ah!"

Katsuki threw an arm over his eyes and covered his mouth with his other hand, stiffleing his sounds.

Eijirou just sucked harder, tongue swirling around the bud before grabbing it with his teeth for just a nibble.

He pulled away with a pop then slid his tongue over to the other side and doing it all again.

Bite after bite, some drawing blood, some bruising, some just the imprints of sharp teeth all over Katsuki's chest, stomach, shoulders.

He pulled back after one hard bite surrounding his belly button and looked up at his alphas face.

Blushing bright red, lips bitten raw and breaths coming in pants.

"Eijirou....I can't- just please..."

Eijirou smiled and while keeping eye contact tore off his alphas pants.

He also barely dodged the alphas cock springing up from it's confinement to smack against his stomach.

But he didn't pay attention to that, he was focused on making his alpha spread his legs so he could claim him more.

Started on the inside of his thigh locking his teeth near his pelvis. He wanted his alpha to feel this one for a long while.