The sharp sound of skin impacting against skin resounded like a thunderclap in their enclosed room.
“Fuck!” Katsuki shouted, fingers tightening around an already-bundled bundle of sheets in his sweating palms as he slowly lowered his head back down, groaning as he readjusted to the lingering feeling of his inflamed, beaten-red ass stinging in pain.
“Sh-should we stop now, Kacchan?” Izuku asked, his hand massaging the small of Katsuki’s back so lovingly, so tender. It was so different to the firm, hard slaps against his flaring cheeks just a few seconds ago.
“Hell no,” Katsuki breathed, sniffling through his running nose as the tears ran unbidden down his face. He shifted his lower body to rest more at ease on the pillow propped against Izuku’s lap. “I want more, you fucking nerd pervert. I know that’s not the best you’ve got.”
It was a challenge, a dare, a thrill in the moment, because Katsuki knew Izuku could give him more of that sweet, sweet rush of euphoric pain. Izuku’s spanks up to this point were already firm and rough and just so fucking perfect, acting as a physical reminder of just how much he’s trained his body already, but damn. With All Might’s quirk, Katsuki knew Izuku could give him even more. Could break him to limits he’d never thought possible, because who else but Izuku damn Midoriya could give him what he hungrily wanted at this very time in his young life?
“Kacchan, are you sure?” Izuku asked, a hint of worry yet amusement in his voice.
And Katsuki wasn’t going to back away. Not now. Not when he could experience new heights, here and now. “Do it.”
There was a brief pause as Izuku took in a quick breath. “... Okay,” he finally said, raising his scarred right hand up into the air, other hand firmly pushing down against Katsuki’s back. He channeled a surge of energy into his raised palm, the soft crackles of green energy sparkling into the air.
Katsuki recognized the sound of Izuku’s quirk activating. He tensed his red cheeks, leaning his head down into his crossed arms as he readied himself for what would be undoubtedly an experience.
“1%,” Izuku said, so coolly and with an almost sadistic tone that sent shivers down Katsuki’s back.
There was a soft lull in the air as Katsuki took in a sharp breath.
There was no turning back now.
But all the convincing and preparation and eagerness couldn’t prepare him for what he experienced not a moment later.
If Katsuki could describe the moment (which he realistically couldn’t, because the shock of it all broke him like a motherboard sparkling and frying in a beautiful explosion), he would’ve said his senses were thrown into overdrive in a split second.
The sound of his ass getting 1% One for All smashed (or spanked) was louder than any thunder he has ever heard, not even if there was a lightning strike a few feet away from him. He could do all but naught, not even a yelp or a moan because the air had been whooped out of his lungs in an instant.
And his ass? Don’t even get him started.
The sensation of getting spanked with that much extra power and energy was beyond what his brain could comprehend. It was like he could feel it was supposed to be painful, and yet nothing came out of it. His brain had complete whited out the moment entirely, like something just reset his memory to a blank state for just that moment in time.
And Izuku was worried. Not only did his boyfriend just seem to stop responding, body frozen in a mid-jerked position, head raised in shock, mouth open, the tears still streaming down his face as his knuckles had become bleach-white, but he was not expecting Katsuki’s ass to jiggle as much as it did before his very eyes.
Objectively speaking, his boyfriend had quite the muscular and toned ass. Yes, it had just the right amount of fat to shape that sweet ass into such a perfect ass, but all his earlier spanks had barely jiggled the flawless skin’s surface more than just a, well, realistic ripple of how fat moves when disturbed.
Asses shouldn’t jiggle like half-filled waterbeds, with practically small waves rippling out from the source of impact. This was... a surprise. One that Izuku would have to write down in his notebooks later.
“Kacchan?...” he asked quietly, nervously, as his hand gently touched Katsuki’s upper back.
And like he pushed down on a reset button, Katsuki gasped and collapsed back down onto the mattress, chest heaving as he gathered his bearings. “Holy... shit...” Katsuki whispered, weakly trying to move his lower body which, by the way, he couldn’t feel. At least, not at that moment. His sensation came back later, only to feel like someone just poured gasoline over it and lit his ass on fire.
Izuku sighed in relief. “Oh good, I’m so glad you’re still here, Kacchan,” he whispered, hand idly rubbing into his soft blonde hair.
“I felt like... I just died, and came back,” Katsuki said, wiping the streaming tears off his face and into the damp sheets below. “Fuck.”
“We should really stop now--”
Katsuki mustered all his energy to grinding his numb hips further into Izuku’s lap. “I want more.”
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