Chapter 3: One Month

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"Kacchan, we shouldn't," Izuku whispered below him, mouth swollen and red from Katsuki's kisses, eyes closed in pure bliss as their bodies slid together despite their boxers still creating a barrier between them.

Izuku was intoxicating. Had always been. His face, his eyes, his mouth, his voice, his body, his scent. Everything sending Katsuki closer and closer to the abyss of his volatile emotions.

It had taken Katsuki the better part of two years of high school to pull his head out of his ass to realize that all of the fantasizing and skirting around each other when they were close to their cycles meant something. That it had always meant something. That it wasn't just his body's natural reaction to a nearby alpha, and that it wasn't going anywhere. He was around alphas all day every day which was just an occupational hazard of working to become a hero, but he'd never once imagined himself being with any of the others the way he almost religiously fantasized about Izuku. The one time he'd tried in first year had resulted in several days of no eye contact with Kirishima.

Even after they'd finally fallen into each other, taking that headlong dive off of the cliff they'd always been teetering on, they'd been careful. Condoms. Birth control. Suppressants. They never did anything close to their cycles, Izuku happily bottoming often times, kept their hands off each other during the day as if nothing had changed.

Everything had changed as it inevitably would though, and Katsuki was starving.

His body was heated almost to discomfort, his cycle right on the cusp of kick starting, and he needed Izuku. Needed him like a dying man needed water.

"Need you, Deku. Want my mate, want you," Katsuki rasped against Izuku's throat as he gently scented him, "Need my alpha, Izuku."

Izuku positively keened beneath him, turning his head to catch his mouth again in another slow, searing kiss.

Izuku had gone pliant beneath him, following his lead as he stripped them of their boxers and straddled his hips. They'd been less careful that night, indulging in each other. Drunk on each other. Relying on the birth control.

Their sex had been different that night, slow and steady and loving as Katsuki took everything his body had been screaming for. He reveled in the heat and feel of Izuku filling him, moving inside him, gripping his hips with bruising force, coming apart beneath him.

When they were both panting and sweat drenched and satiated, Katsuki marked up Izuku as his without sinking in his teeth like he so desperately wanted to. Deep red love marks were his next best option, and he readily used them. Then they lazily made out for hours before passing out together.

Katsuki had never felt more fulfilled in his life.

.....

Katsuki woke up retching which was absolutely the worst end to the best dream, and before he could puke in his bed, he hung his head over the side to use the trashcan he'd put next to his bed just for that reason. "Ugh," he groaned, rolling over onto his back when his stomach was empty.

His bed was empty, and he felt worse for the fact that it was his own fault.

That night... that night had been one of his best experiences in recent memory. He couldn't bring himself to regret any moment of it, every moment of bliss and touch and silent communication.

Even during, he was pretty sure he knew. He knew in his bones that even if they'd used a condom, he still would have ended up pregnant. No matter how careful they were, this would have been the outcome. He'd heard of horror stories like that from other omegas, but he never thought it would actually happen to him. They were all just stupid. They had missed a pill or forgotten to get their shot or they were in the full swing of their heat. Something, anything, to pretend like he wasn't like them.

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