Quirkless omega Katsuki owns a book store. He's dating pro-hero omega Chargebolt and their lives are great together and they're so happy. Then Denki introduces Katsuki to underground pro hero Mind Break. Shinsou is a quiet alpha with a sharp wit that immediately intrigues him.

At first everything is fine. Katsuki's glad that Denki has another friend to look out for him as a hero but then he starts to get insecure.

Denki and Shinsou spend a lot of time together. The both of them have really powerful quirks and would be a perfect couple.

And here Katsuki is just a quirkless omega freak. He's not worth their time. So he stops reaching out. It'll only be a matter of time before they forget about him.

Besides, Denki deserves an alpha that can make him happy. One who can make him the family they've dreamed of.

Denki doesn't need Katsuki. A pathetic omega with difficult heats. Someone so amazing doesn't need to be tied down to someone like him.

Denki deserves the best and that's not Katsuki.

Of course it all comes to a head after a couple of month of this. And of course it just has to happen right before Katsuki's heat.

Katsuki plans on dealing with it himself, like he did before he met Denki, and he's dreading it. His heats hurt so bad but its fine.

Even if Denki being there makes it hurt less. Even if Katsuki knows that the next 7 days are going to be hell. It'll be fine. Just like he used to before, Katsuki will take care of himself.

What he's not expecting is to walk through his door and be dragged into a tight hug. Denki’s arms are around him and they feel like they did the first time the two omegas held each other.

Katsuki lets out a long whine and collapses in his hold.

Tears burn so harshly behind his eyelids and his heart beats in his chest. "D-Denki?" he whispers.

"You've been avoiding me," Denki says. "And your heat starts tomorrow. You can't avoid me when your heat is so close. I can't stand the thought of you suffering alone."

Those arms are so tight and warm and Katsuki’s emotions are all over the place right now. "I-I..." he doesn't know what to say.

"I couldn’t figure out why you were avoiding me but I get it now after Mina yelled me. I should have told you, Kaachan, I'm so sorry."

Told him what? That Denki found an alpha? That he's leaving Katsuki? Its ok, he figured it out himself. It's /fine/. Its not like it's a surprise.

"I introduced Hitoshi to you for you."

"W-what?" That's not...that's not what he expected to hear. "Fo-for me?"

Denki pulls back enough so they’re looking at each other. "Your heats hurt so bad. I try to help, I think I do, but you're always in so much pain." His voice is strained. "Hitoshi can help you better. You need and alpha, Kaachan."

He brought Hitoshi around...for Katsuki?

He shakes his head. "D-Denki...I don't under-"

Katsuki’s cut off by Denki taking his face in his hands and kissing him. Because of his quirk, there's always a little spark to Denki’s touches. It never fails to make Katsuki weak in the knees. His hands fist in the others shirt-

-soft whines sounding in his throat. Denki kisses him like he's afraid Katsuki’s going to disappear. Only a day out from his heat and everything feels like its running against raw nerves.

When the need for air becomes too much to ignore, Denki finally pulls away. "I love you."

Katsuki’s eyes burn. "I-I love you to."

"I don't want to watch you suffer, Kaachan. O-our toys aren't enough, but if you don't want Hitoshi there then it's ok. I'll take care of you like always."

Katsuki whimpers and presses closer to the other omega. "N-not leaving me?"

"Never! You're mine, I'm never letting you go."

It used to surprise Katsuki how possessive Denki can be. Omegas usually aren't like that but it feels so good to be to object of someone's desires. He's always been the Broken Omega that people pitied, but to Denki he's beautiful.

Which is why its strange for Denki to even think about someone else in their bed. "Why him?" Denki is usually all smiles but his possessiveness is strong. He barely tolerates it when Kirishima or Sero throws an arm around Katsuki’s shoulders.

Denki runs a hand up under Katsuki’s shirt, fingers pressing against sensitive nipples making Katsuki moan. "Because when I think of him touching you like this, I don't want to rip his throat out."

The dark note to the other omegas voice has Katsuki pussy throbbing. "R-really?"

Denki nods, his nails scraping along Katsuki’s sensitive skin. "You're so pretty, Kaachan, and you're mine. I don't like people touching you, but he's different."

Katsuki swollows another moan, thighs rubbing together for some kind of friction. "De-Denki!"

Lips press against his neck. "I love you so much. I don't want to watch you be in pain anymore, Kaachan, but if you don't want Hitoshi there I won't force it."

His skin feels electrified everywhere that Denki touches him. "Y-you’ll be there?"

"The entire time."

"...ok."

tbc

Denki calls Hitoshi and tells him to come by in the morning. That Katsuki agreed to let him help. While they talk, Katsuki goes to take a shower.

He knows its pointless. The week is only going end with him sweaty and gross but it makes him feel better about letting an alpha-

-into their bed. Katsuki trusts Denki more then anyone but that doesn't stop him from being nervous. There's never really been an alpha Katsuki’s felt comfortable with.

When he comes out of the bathroom, Denki is there wrapping his arms around Katsuki’s waist. "He'll be here-

-early in the morning."

Katsuki swollows at that and nods. There have only been a few alphas he was interested in before but none of them he slept with. Not that they didn't try and push him but none of them were successful.

Now he's about to willingly spend a heat with one.

Katsuki would be lying if he said he wasn't terrified.

Denki runs his fingers along Katsuki’s cheeks. "Its not too late to change your mind."

He shakes his head. This heat is going to be a bad one. Katsuki can feel it. An alpha being there will probably be what saves him.

"Just don't leave me alone."

"Never." He pulls Katsuki toward their nest. "Come on, I have something for you."

Katsuki goes, his body beginning to ache as time goes on. He doesn't bother with clothes, there's no point, and he'd rather feel Denki against him.

The funny thing is that Denki is the type to smile and laugh at everything but when it's close to either of their heats he turns into a possessive asshole who only wants to keep Katsuki for himself.

Katsuki’s is different. For the most part, he's an asshole who swears too-

-much and is way to loud. But when his heat comes he becomes...docile isn't the right word but close to it. He content to let Denki do what he wants. During the actual days of his heat though, Katsuki is a whimpering crying mess. The pain is too much sometimes and he just wants-

-Denki to hold him because nothing helps, knotting dildos barely take the edge off. They tried synthetic pheromones before but it hadn't worked. Katsuki hated them, could smell the chemical structure and Denki got too angry at the smell of another person in their nest.

Which is why its so surprising that there's someone who might actually be able to help. Someone who won't set off the danger alerts in Katsuki’s head and who won't piss Denki off.

Katsuki is pulled into their nest, towel forgotten on the floor. He whimpers when he lays-

-against the soft materials. They feel good on his aching body.

Denki kisses him before be leans over and grabs a small box off the nightstand. "I need to show Hitoshi you're mine." He lays himself on top Katsuki. Their chests pressed together and Denki's pelvis-

-settling between Katsuki’s spread legs. The position is familiar and comfortable. It allows the two omegas to rub their small cocks together and gives Denki easy access to Katsuki’s hole.

"You want to give me hickies?"

Denki grins and kisses his neck. He adds a little bit of his quick to it, just like he knows Katsuki likes, and basks in the gasp it pulls from the other. "Yes, but not just that." He opens the box and holds up the item inside.

Its a black and yellow leather collar, the inside lined in soft silk. There's a tag on the front that reads: "Katsuki: Property of Chargebolt"

Slick coats his thighs and Katsuki squirms as he stares up at it. Denki has said before he'd like to put collar on Katsuki but it'd never been more then talk.

Denki smiles brightly. "I may not be able to mark you but you are /mine/, Kaachan." He kisses Katsuki again, harder-

-this time and shoves his tongue into the others mouth. Katsuki whimpers and moans into the kiss, his pussy throbbing. "I have to show that alpha that even though he gets to fuck you this week this," two fingers are shoved into Katsuki’s dripping hole, "belongs to me."

Katsuki gasps and presses into those fingers. If he cums right before his heat a few times then sometimes it hurts less and Denki takes full advantage of that every time. "De-Denki."

The other omega grins and presses a thumb against his clit. "Let me put it on you, Kaachan."

Fuck he wants it. Wants to belong to Denki so whole heartedly. Some omegas wear collars in addition to their mating bites, its not weird to see. It's a more obvious sign that they're taken. Katsuki wants people to know he belongs to another. "Ye-yes please collar me, please."

Denki purrs happily as he watches Katsuki bare his neck in submission. Something usually reserved for alphas only.

The hand in Katsuki’s pussy is removed, much to his dismay, and a few seconds later the collar is secured around his neck. The weight of it is comforting.

The feeling of being /owned/ settling some need in Katsuki’s stomach.

Neither of them expects it, never considered it a possibility really, but Katsuki cums the second the band is secured. His pussy throbes around nothing and he moans wantonly as pleasure runs through his body.

Wetness coats both their thighs as Katsuki /squirts/. He's never done that before.

Denki’s eyes widen and a satisfied smile curves his lips, purrs rumbling through his chest. "Perfect. Mine forever, Kaachan."

Katsuki nods, his body twitching with aftershocks. "Yours."

He tilts his head up, suddenly needing another kind of contact. Denki understands immediately and presses their lips together, his hands running all over Katsuki’s aching body to soothe him.

They're omegas. Omegas aren't supposed to belong to each other. But they do.

Denki reaches for the bedside table for their toys. He pulls out a silicone dildo that can withstan Denki’s quirk and handcuffs. "I'm going to ruin you before Hitoshi even has the chance to touch you."

Katsuki’s eyes cross when he says the toys. Denki’s going to kill him.

tbc