Izuku had been with omegas in heat before. He had specifically been with Ochako Uraraka, who was pretty tame.
Katsuki Bakugou was a whole new experience.
First of all, Katsuki cramped a hell of a lot worse than Ochako. He spent the time between waves whining and writhing in his nest as he stayed as far away from Izuku as possible because he felt sweaty and hot. Though Izuku often pulled him close anyway since his inner alpha wanted to protect and comfort. Katsuki moved while in Izuku's loose grip anyway.
In a desperate attempt to soothe his omega, who's cramps made him start crying, Izuku gave him a massage while calling Ochako for assistance. She didn't know what to do or how to help, and the massage wasn't very helpful.
"Denki..." Katsuki whispered. "Denki cramps." The poor omega lied in the fetal position with one arm over his eyes in an attempt to hide his tears from the alpha.
Izuku scrolled through his contacts, scrolling all the way to the K's in search of Kaminari's name. Once he found it, he hit the call button.
"Is something wrong?" Denki asked almost instantly, giving Izuku no chance to say hello.
"Ah, kinda. How do I help with the cramps?" Izuku asked while gently caressing Katsuki's biceps.
"Heat, really." Denki answered. "Though he may not like that since he's already overheated."
"Deku..." Katsuki whined up at him. Izuku quickly thanked Denki then hung up. Katsuki crawled into his lap, pushing him back until his head hit the pillows. "Knot."
Another different thing about Katsuki: he turned into a whining mess when he neared the peak of a wave.
Izuku didn't mind so much because his rut-controlled brain easily kicked in during those times. The only reason Izuku wasn't lost to his rut was because Katsuki's desire for extra attention. That was probably also the only reason Izuku hadn't gone full-animal on the blonde.
Izuku guided Katsuki down onto his cock, moaning as the omega's hole easily swallowed him whole. Katsuki threw his head back with the motion. Izuku still couldn't believe that he had Katsuki in his arms. He trailed his thumbs in circles on the blonde's hips, assisting in bringing pleasure to them both.
"Fuck, Kacchan." Izuku whispered his praise. "You're so tight for me." Izuku received a small moan as a strained reply.
Katsuki, too focused on getting knotted to care about words,, tried to quicken Izuku's pace, but he couldn't without having his head fully in the moment. "Fas'er." Katsuki slurred out. He haphazardly started to move his hips.
Izuku grabbed his hips just as he was about to grind down. A broken whine escaped the omega. Izuku pulled him off then forced him down into the nest.
"'Zuku?" Katsuki whimpered. A hand pushed his face down into the pillows. The cold air of the room felt foreign against his bare ass, which sat in the air.
"What do you want, Kacchan?" Izuku asked him.
Katsuki's breath hitched for a moment. "Fucking maul me." The blonde answered. It was one of the most coherent sentences Izuku had heard him mutter in the last hour.
The alpha quickly pulled his hips back then snapped forward. The pillows and blankets muffled Katsuki's loud cry of pleasure. Izuku set a pace that allowed him to thrust quickly while still hitting that spot inside Katsuki.
"Faster!" Katsuki called out. He gripped the blankets as tight as he could, and his eyes screwed shut. But that didn't stop Izuku from obeying his command. Izuku used his quirk to go faster, making Katsuki cry out more and more with each hit to his prostate.

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Their Hot Romance (BakuDeku)
Fanfiction*AGED UP *SMUT ALL AROUND *OMEGAVERSE *CW; • ANXIETY • R*PE (not in detail, but mentioned) • KIDNAPPING • TORTURE • MURDER He didn't believe in fated mates. He refused to accept the notion that his forever could be some asshole on the stre...