unexplored territory [bakugou/deku, 2.3k, nsfw]
first prompt request! thank you for sending it in, I hope you like it xoxo (also cross posted to ao3!)
warnings: nsfw, light dom/sub, frottage, nipple play, minors DNI
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Izuku isn’t always amazing at things on the first try, while Katsuki on the other hand seems to catch on to everything so quickly and with such ease. Perfectionism at least is a quality that they both share, so even when Izuku fails in the beginning, he refuses to quit until he can do it with his eyes closed. Breaking his fingers, breaking his arms, breaking the plethora of bones in his body trying to master his quirk was easy, because the drive to make the quirk his own was such a powerful motivator. Well, maybe not easy, but the motivation deep within his core truly was the biggest push he needed.
Staying up all hours of the night studying for exams, spending hours upon hours in the gym to perfect his body to handle his quirk and whatever else comes his way, and attempting to keep a steady and healthy diet are mindless tasks now, ingrained in his blood and expertly learned and honed.
Which is why, Izuku thinks as his hands slip underneath Katsuki’s tank top, this particular task is so…. daunting.
They’re still in the new stages of dating, slowly melting away all of the awkwardness of first kisses and hands touching hands, and even though it’s only been a few months, Izuku is frustrated that he’s not an expert at Katsuki’s body yet. He’s stupidly determined to change that.
“Izuku,” Katsuki grumbles from his position on the bed, sprawled flat on his back with his notebook held up in front of his face, “Cut it out. We literally graduate in a fuckin’ month, we have to study for our final exams.”
Izuku swallows thickly from his place hovered over the blonde, his hand pausing where it’s pressed over Katsuki’s stomach. “We’ve been studying for hours, Kacchan.”
Katsuki scoffs, “And? You gonna tell me if I sit you down right now and quiz you, you’ll ace every subject I throw at ya?”
Izuku pouts. “It’s not good to cram too hard. Can we just take a break?”
“And do what?” Katsuki replies mindlessly, going back to flipping through his notebook.
Izuku slides his hand higher, Katsuki’s tank getting bunched up further until his pink nipples are exposed to the warm air in the dorm room. Katsuki shifts a bit, but doesn’t push him away. He also doesn’t put down his notebook either, so Izuku bites his lip and takes it as a green light.
Katsuki’s body is something out of Izuku’s wet dreams, really, and after they got together, once Izuku was allowed to touch, he decided to make it his new mission to figure out exactly all of the ways to make Katsuki tick.
He’s already discovered the spot behind Katsuki’s ear that makes him gasp, the spot right in the dip of his throat that, when Izuku latches on and sucks, causes Katsuki’s fingers to spasm and his breath to stutter. He’s figured out that Katsuki doesn’t really like the back of his neck touched, but he loves when Izuku drags his nails sharply down his spine when they are kissing.
He’s honestly discovered a lot about his boyfriend’s body, but there’s so much territory that’s currently unexplored, and it’s driving Izuku mad.
They haven’t really gone past making out and hand jobs, and Izuku tries not to get too handsy since he’s not really sure what kind of boundaries there are at this new, fresh stage in their relationship, but Izuku’s been watching. He’s been analyzing, calculating, and watching. He notices how Katuski’s breath hitches when he’s cold and his shirt rubs against his chest, nipples hard and poking out beneath the fabric. He’s noticed how Katsuki’s hips twitch up when they’re making out on his bed and Izuku’s hands drag up his chest, over his pecks.
It’s time to test his theory, and see what kind of reactions Katsuki will give him. So Izuku can see if this is another discovery he can add to his ever-growing list of everything Kacchan.
Izuku situates himself so he’s straddling Katsuki’s thighs, and though he can’t see the blonde’s face behind his notebook, he sees how Katsuki’s fingers clutch at the pages just a bit tighter. Izuku has his tank top bunched all the way up to his armpits now, pale muscular torso on full display, and Izuku’s mouth nearly waters as he zeros in on those cute pink nipples, just begging to be touched.
He takes it slow, dragging both hands up along the curve of Katsuki’s waist, and at the first brush of his thumbs against his nipples, Katsuki jerks so hard he drops his notebook. The pages flutter as it bounces off the bed and onto the floor, and now Izuku can fully see how pink Katsuki’s cheeks have become.
Oh, okay. Yeah, Izuku is going to get a lot of research done tonight. Katsuki is his favorite subject, afterall.
“Izuku,” Katsuki growls, low and quiet, almost like a warning. Izuku happily ignores him, thumbing his nipples a bit more firmly this time, and when his nail catches against the skin, Katsuki straight up squeaks.
“Jesus - calm down,” he manages to grit out through his teeth, but his hands have come down to clutch at Izuku’s thighs, and his gaze has darkened the way it always does before they fool around.
“Have you ever had your nipples played with before, Kacchan?” Izuku asks quietly, massaging his pecs with large, calloused hands.
“Don’t ask stupid questions,” Katsuki snaps, and then softer, quieter, “You… you know you're my fuckin’ first. Or whatever.”
First kiss, first boyfriend, first love - Izuku feels his heart swell that’s he’s managed to collect so many things from Kacchan. It makes him so happy his heart could very well burst.
But - first, he needs to focus. Katsuki’s eyeing him curiously, and so Izuku settles more firmly on his hips before gently, so gently, fluttering his fingers over the sensitive nubs.
“What - ah, f-fuck,” Katsuki chokes out, and the startled laugh that escapes his lips makes Izuku pause.
“Sensitive?” Izuku asks with delight, because he knew deep down they were, but he didn’t know that Katsuki’s chest would also be ticklish.
“Just - do it harder,” Katsuki grumbles out, not meeting Izuku’s gaze. “None of that gentle shit.”
Izuku happily ignores him yet again, scraping his nails feather light around the pink buds until Katsuki’s full on squirming beneath him, lips twitching on a smile as he tries not to laugh. His hands dart up to grab Izuku’s wrists, but Izuku is quicker, snatching the blonde’s hands up in one of his own and pinning them above Katsuki’s head. Izuku’s hand is large, and able to wrap completely around both of Katsuki’s wrists to keep him in place, which is nice because it allows him to have a free hand to continue his exploration.
“Are your nipples ticklish, Kacchan?”
“No - ”
His words are cut off with a gasp when Izuku leans down, flicking the tip of a tongue gently across his left nipple, and Katsuki’s back arches up, his body trembling as he chokes on a giggle - but then moans when Izuku sucks on the bud firmly.
“Ah - mmm,” Katsuki moans, and Izuku notices his cock throbbing in his sweatpants.
“You’re so cute,” Izuku teases, enjoying the way Katsuki’s cheeks flush at the compliment. He’s still firmly holding Katsuki’s wrists above his head, and he uses his free hand to trace his fingers softly along the side of Katsuki’s chest, squeezing his pec before dipping dangerously into the hollow of his underarm. That has Katsuki snorting softly around a surprised laugh, and Izuku notes with glee that his hips grind up at the same time.
Oh, he likes this? Izuku mentally notes that in his head.
“Izuku - fuck cut it out!” Katsuki’s voice is shaky, his head turned to hide in his shoulder as Izuku continues to drag his fingers teasingly across his chest, tickling at his nipples, the sides of his ribs, dipping into his armpit before coming back to those pert, hard, sensitive nipples. Izuku can feel Katuki’s cock pulse, his hips grinding up unconsciously.
“I wonder if you can come like this,” Izuku muses, “I wonder - how would a feather feel? If I just… tied you up, tickled your nipples for hours until you couldn’t take it anymore. They’re really sensitive, huh?”
“Shut - sh-shut up.”
“Hm - we don’t have any feathers - oh!” Izuku exclaims, releasing Katsuki’s wrists to lean over, digging around in the bedside drawer before pulling out a small vibrator they like to play with occasionally. Izuku’s only used it on their cocks before, but he’s so curious -
“Don’t you dare,” Katsuki groans.
“Hold onto the headboard,” Izuku commands softly, and Katsuki swallows and does as he’s told.
When he turns it on, Katsuki visibly tenses up, his gaze growing dark, and when Izuku gently grazes his nipple, Katsuki’s entire body arches up, his arms shooting down to shove the toy away as he shrieks.
“Oh my g - f-fuck!”
It’s like music to Izuku’s ears, the strained laughter and desperate gasp that the blonde lets out.
“Arms up, Kacchan.”
He grumbles but does as he’s told, fingers gripping the headboard so hard it creaks, and he bites his lip as Izuku lowers the setting on the vibrator before pressing it back to his nipple. The reaction is instant, Katsuki wriggling aggressively underneath Izuku, and finally after a few moments, Izuku hears little broken giggles from Katsuki’s mouth. His eyes are squeezed shut, beads of sweat popping up on his forehead, and when Izuku uses his other hand to pinch and roll his other nipple, the blonde cries out a shaky moan.
“Ah - ahah - Izuku it’s - fuck, I c-can’t - ”
“Does it tickle?”
Katsuki’s face burns. “Fuck off - yes, ahahah! You fuckin’ asshole - !”
“Does it feel good?”
Izuku rolls his hips down, grinding their arousals together, watching at Katsuki’s mouth parts and eyelids flutter with pleasure. He switches the vibrator to the other nipple, and darts back down to flick his tongue ticklishly over the other one. Katsuki’s shaking violently, as if his body has no idea how to handle the sensations, and when Izuku thumbs the vibrator up to a higher setting, he nearly groans at the shriek of laughter that fills the room.
“God - you drive me crazy,” Izuku groans, “You’re so cute, I can’t believe your nipples are so sensitive.”
“I c-can’t help it,” Katsuki whines, and his fingers are turning white with how hard he’s trying to keep his arms up. When Izuku drags his fingers back into the dip of Katsuki’s armpit though, the blonde can’t hold out any longer, and his arms dart down to grip Izuku’s wrists. The action simultaneously causes the vibrator to press harder onto his nipple, and Izuku bites his lip, drunk off of the moans and laughter coming out of his boyfriend’s mouth as he squirms helplessly against the bed.
“Oh - nng - Izuku, Izuku, I’m - ahahah, g-gonna -!”
“You gonna come like this?” Izuku says in a low, deep voice as he grinds harder against Katsuki’s lap. His fingers are trapped now in Katsuki’s underarm, fingers fluttering sporadically as he circles the vibrator torturously over a nipple. This time, when he darts down to lick, bite, suck at the other nipple, Katsuki screams, gasping on a sob as broken laughter forces its way out. It’s so much, too much, but Izuku’s feeling mean, so he hums against sweat-damp skin as he flicks the vibrator to the highest setting, pressing it right over the sensitive bud.
Katsuki’s covering his face now, embarrassed tears leaking out from under his trembling palms, and with one last roll of his hips, he’s coming, body going taut like a live wire as Izuku tickles and licks him through his orgasm.
“Stop - st-stop,” Katsuki gasps, and Izuku tosses the vibrator to the side in order to bring both hands to Katsuki’s chest, teasing those cute nipples, grazing down his sides, pinching at his hips and trailing back up again to squeeze his pecks as he feels the blonde’s cock twitch and throb, his sweatpants growing damp through his release. Katsuki paws at him weakly, tiredly giggling and whining as the overstimulation short circuits his brain.
“Ahaha - ah, p-please,” Katsuki writhes, clutching at the front of Izuku’s shirt as the boy leans down, kissing and nipping up the side of his neck. Katsuki’s strained laughter is right in his ear now, and Izuku groans loudly as he brings a hand down to squeeze his own cock.
“Just - fuck, just a little more, Kacchan, you can take it, right?”
It’s less of a question and more of a demand. Izuku pants wetly into Katsuki’s neck, one hand rolling a nipple between his fingers as his other squeezes his own arousal, and finally, when Katsuki’s sobbing and babbling nonsense into his ear, Izuku finally comes with a loud groan, pressing his forehead to Katsuki’s temple as he rides out his orgasm.
“Jesus - fuckin’ quit it,” Katsuki whines, finally batting away the hand that’s still teasing his oversensitive nipples. Izuku mumbles out a half-hearted apology and sits up, smoothing his palms firmly over Katsuki’s chest to soothe the blonde’s trembling nerves. After a few moments of catching their breath, Katsuki’s eyes flutter open, and he looks utterly debauched.
“Holy crap,” Izuku mumbles, leaning down to kiss the blonde deeply, cupping his face in large hands and wiping his tear tracks away with his thumbs. He has so much content to add to his Kacchan folder now.
“So much for a break,” Katsuki grumbles, shoving Izuku off of him and splaying his limbs out tiredly. “Now I need a goddamn nap, you fuckin’ menace.”
“Sorry?” Izuku offers, but they both know he’s not actually sorry at all. “I didn’t know your nipples were so - ”
He’s cut off when Katsuki shoves a hand in his face, his cheeks glowing pink. “Shut up, oh my god.”
“Kacchan’s so cute,” Izuku coos, voice muffled beneath his boyfriend’s palm, “I wonder where else Kacchan is sensitive?”
Katsuki just groans loudly and shoves a pillow aggressively over his face to hide his blush.
God, Izuku is going to be the death of him, he swears.
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