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A loud moan echoed throughout Izuku's room, and silently the boy was glad his mother was hanging out with her friends for the day. Of course, she only left after Izuku had assured her that he and his kacchan would be okay alone. He had reasoned with her that he and Katsuki were adults, and they'd be fine. It worked.
Katsuki thrust sharply, hands gripping bruises into Izuku's hips as he hid his face in Deku's neck. Izuku had begged so beautifully before that Katsuki was beginning to wonder if the boy was truly a masochist, begging for his cock as if it were his last meal. Of course, Katsuki loved that.
"Yes! Fuuuuuck! Ka-," Izuku's sounds were cut off by his own shattering moan as Katsuki dug his teeth into the base of the other's neck. God, how was Kacchan so good at that? How was he able to catch the section between his collar bone so effortlessly between rough fucking every time? Izuku didn't know, but he loved it.
Katsuki smirked, licking the marks as he slowly pulled out, feeling the drag of his cock against Izuku's walls. He'd always loved biting Izuku, and he loved it even more when the mark was visible for nearly a week to come. It felt as if Izuku was pulling him in when, in actuality, Katsuki had trouble fitting his entire length in the first place.
"Please! Pleasepleasepleaseplease Kacchan give it all to me! I can take it now, fuuuuck- PLEASE!"
It had sounded so pathetic to Katsuki when the blonde knew Deku could beg better, so he waited and straightened, only to hold himself up with his hand wrapped tightly around Izuku's throat. He'd heard the emerald boy beg so much better, especially for his dick.
"Beg harder, or you won't be able to breathe, nerd."
It was a demand and an ultimatum that Izuku wasn't sure he wanted to ever comply with. Both sides sounded beautiful, and yet he wanted to be somewhat conscious for his birthday fuck... And so, Izuku began to beg, the way he knew Katsuki enjoyed.
"Kacchan, please, Kacchan, oh god! Give me your dick, every inch, fill me! Break me, I beg, god!! Fuck, please fuck me, break me, ruin me for anyone else. I need it! Please, I'll do anything! I can't- Yours! I'm yours, just plea-"
Katsuki always had a secret laugh by himself as he thought of his Deku cursing at him when otherwise Izuku found every way out of saying a single curse word in the open, but that wasn't his concern right now. He'd think of Izuku's mouth and the way he reacted later.
Izuku's statement was cut off by his own stunned silence as Katsuki roughly gripped his hips and nearly used him as his own fuck toy, his personal Deku shaped fleshlight. With Izuku silent, eyes glazed and mouth gaped open, Katsuki wanted to laugh at how similar he was to a sex doll. His personal sex doll.
Izuku's begging wasn't as good as Katsuki had heard him babble before, but the blond almost broke, needing release. And so, to keep up his end of the bargain he'd so shamelessly pushed on to his Deku, Katsuki kept his fingers tight around the other's neck. Hoping, near about praying, that his fingerprints would be visible later.
"You can do better, but god dammit, Deku, I'm still gonna fuck you with every inch within an inch of your life. Gonna," a thrust, "break," and another, "you," and another, "all for me!"
He followed his promise with a growl as Izuku began to sob, god did Katsuki love his tears. More. More! He needed more!
He leaned down slowly, bringing his rough pace to a dull grind, before slowly licking Izuku's cheek. His salty tears making Katsuki moan, which in turn made Izuku cry harder as Katsuki had stopped fucking the other.
"Please, Master!" Izuku wasn't sure where it came from, but he didn't have the mind to overthink, such as Katsuki's eyes widened.
"Master, eh? I like that, I'm your master, aren't I? You can't cum or touch yourself or even think without me telling you, isn't that right?"
His rhetorical questions had been emphasized by the squeeze of his fingers as he pulled up one of Izuku's legs, placing his left ankle on his shoulder. The new position gave the ruby eyed boy the opportunity to reach even deeper, even though he knew that with Izuku taking all of him that it would hurt him. He didn't care — it would give him more tears, the tears he craved.
And it did, his deep thrust provided just the thing. A broken sob made its way from the bottom of Izuku's chest, ripping right through him and showing itself in the form of fat tears that Izuku wasn't able to wipe away before Katsuki nearly bent him in half to consume.
"Good boy, such a good pet for his Master, such a good little cock sleeve for me. Yes, cry, just like that, Deku."
Izuku could barely comprehend what was happening, but he knew that if Katsuki continued to growl in his ear that way with his left leg straining as it was, that he would be helpless to the sobs of pain that were about to break from his scratchy throat. After all, Katsuki had never removed his hand.
Afraid he'd stepped too far, Katsuki moved back a little and spoke a bit softer this time, "Color?"
Izuku whined, wishing his hands weren't tied together under his and Katsuki's weight as they rested behind his back. Oh, how badly he wanted to bring his boyfriend closer and just scratch his own marks into the other's back, claiming him for his own. But that wasn't the deal he'd made, and he wouldn't break it now.
Katsuki stopped and patted Izuku's slightly burnt and bruised thighs, "Color, Deku."
Izuku knew Katsuki wouldn't continue without a color, and he knew Katsuki would stop immediately if he had whispered 'red', but he couldn't.
"Green!! Please!! Green, I swear!!" He sounded so beautifully desperate, so willing, so compliant.
It didn't even get a chance to echo on its own before Katsuki had immediately begun thrusting again. This time removing the hand from Izuku's throat, watching with a smirk as his pet unintentionally took in quick and pained breaths, earning the explosive boy more of those beautiful tears.
"Good boy, so good for me." Katsuki couldn't help but praise the other, especially after finding the weakness in middle school by accident. Or that's what he told himself anyway, that it had always been an accident when he found new things to use against the other.
He dropped Izuku's leg and pulled out completely, only to pull up both legs and tease his lover's hole. Seeing Izuku squirm and writhe in pleasure with the added pain of being used and denied, Katsuki felt as if he were in his own heaven. Of course, Izuku didn't feel much different. For today, well, he'd begged Katsuki to use him. To take him and do everything he wanted.
And obviously Katsuki did, it was his Deku's only birthday wish after all, and he couldn't deny his pet on his birthday.