Teach me, Sensei

Fandom: BNHA

Pairing: Deku/Katsuki

Rating: Explicit 

Tags: Voice Actor AU, anal sex, first time bottoming for Katsuki

Summary: When Katsuki gets a role as a bottom in a BL, he asks Deku for help to get some references

The sound of the front door closing pulled his attention away from the script. Looking up from the frankly atrocious anime that his agent was gunning for him to be in, Deku yawned, stretching his arms up high. His bones cracked and popped loudly in the otherwise silent apartment. Wasn’t good for this old body to be stationary for so long. Scrubbing a hand over his face, Deku glanced at the nearby clock. Just about time for Kacchan to be home. Hopefully, his audition had gone well. It wasn’t often that Kacchan was actively chasing a role. Slinging one arm over the back of the couch, Deku turned so he was facing the living room door. A few moments later, it swung open to reveal the brat himself. Swaggering into the room with his usual natural arrogance and confidence, Kacchan paused when he saw Deku sitting on the couch.

Smiling warmly, Deku asked, “Hey, welcome back. How’d it go?”

Kacchan gazed at him silently for a moment then quickly strode over. He cupped his face in his large, warm hands and leaned down to press a soft, sweet kiss to Deku’s lips. Jolting slightly, Deku instinctively stiffened up but as Kacchan’s sweet, warm lips moved over his own, he quickly melted into his touch. Ah, things must’ve gone well…Kacchan was being so gentle. He was usually much rougher when he had a bad day. Curling his fingers slightly into the front of Kacchan’s shirt, Deku pushed up into him, clumsily returning the kiss.

Sighing contentedly, Kacchan slipped away from his lips to press a line of kisses along the curve of his jaw, “Where’s my ‘Welcome Home’, Deku?”

Swallowing down the excess drool that’d pooled underneath his tongue, a little annoyed that he could get thrown so off balance by just a kiss, Deku murmured dizzily, “W-Welcome back, Kacchan.”

Blowing out a harsh breath through his nose, Kacchan straightened up, shooting him an annoyed look, “Don’t call me that. I’ve told you – Katsuki. Just Katsuki.”

“Eh?” Deku tilted his head, following Kacchan with his gaze as he stomped over to the small kitchen, “But Kacchan suits you.”

“How in the hell does that cutesy nickname suit me?” He snarled in response, tossing two scripts down onto the counter.

Deku’s eyes widened in surprise and delight. Jumping to his feet, he rushed over to the counter, snagging both of the scripts. A wide grin spread across his face. There, right on the top, was the script for the video game Kacchan had been aiming to get a role in! With bated breath, his heart fluttering anxiously in his throat, Deku flipped through the pages, looking to see which name was highlighted.

“You got it!” He cried out happily, “Congratulations, Kacchan!”

“Of course I got it.” Kacchan commented lightly, grabbing a bottle of water from the fridge. His tone clearly stated ‘was there any doubt?’ but he wasn’t doing a good job of hiding how pleased he was at being praised. Walking over to join Deku, he pulled the other script out from underneath the first. Deku glanced at it curiously. He didn’t recognize the name or author, though that wasn’t a new thing. His agent constantly got on his case for not being more aware of the popular manga titles.

“What’s that one?” Deku asked, bracing for the inevitable tirade of ‘what kind of voice actor are you? Don’t you do any research?’.

“A BL drama.” Kacchan responded, and Deku instantly relaxed. Good, something he didn’t need to have extensive knowledge on, “Since I was already in that area and talks were in the work, my agent insisted I speak the company while I was out. They were gung-ho about getting me. Practically shoved the script into my hands. It’s gonna pay really well so I agreed to the role.”

“That’s amazing, Kacchan! Snagging two roles in one day! You really are incredible!”

A tinge of pink bloomed in Kacchan’s cheeks, spreading up to the tips of his ears. Clicking his tongue in forced annoyance, he took another gulp of water, tapping his fingers against the top of the script. His sudden thoughtful expression didn’t ping on Deku’s radar. He was too busy happily flipping through the other script, getting a better feeling for Kacchan’s role. Was there a love interest for this one? Kacchan always made him play the love interest whenever they ran through the lines. Suddenly, the script was out from underneath his hands. Blinking rapidly in surprise, Deku looked up to find that Kacchan had the kind of smile on his face that made Deku’s heart do a strange little lurch. He knew that smile. That smile usually meant he was two seconds away from having his legs shoved open wide while Kacchan did all kinds of pervy things to him. A burst of heat that started out as a brilliant bloom in his chest split into two, one half flying up to flood into his cheeks while the other plummeted down to his crotch. It was so embarrassing – Kacchan was just looking at him but he was already getting hard! Just what had this perverted brat done to him?!

“W-What?” Deku sputtered nervously, resisting the urge to cover his crotch. That’d be the exact kind of suspicious move that’d bring Kacchan’s devilish, mischievous gaze straight down to where he didn’t want it to be. He already got teased enough for being so overly sensitive.

“Wanna help me practice?” Kacchan’s voice was a low, raspy purr.

“Practice?”

“Yeah,” Kacchan held the BL script up a little higher, his grin growing even more mischievous, “Let me get a feel for the role with you.”

Deku tilted his head confusedly, “What? You’ve played a lot of tops before, why would you-“

“I’m playing the bottom.”

“……..huh?” Was all he could manage to say after a moment of stunned silence. There was no way he had heard him right. Kacchan, the definition of a top, repeatedly labeled as one of the best voice actors to get for that role, taking on a bottom role? No way. One hundred percent no way in hell. Hadn’t Kacchan been the one to say that he would never take the bottom role? That he’d quit acting then be underneath anyone, even in playing a fictional character? He must’ve misheard him. Not exactly sure what else he could’ve said but the only way Kacchan would take the role of the bottom was if he suffered a head injury.

Kacchan usually got annoyed if he made him repeat himself. This time, he only looked amused. Shifting forward, resting his elbows on the edge of the corner, those beautiful bright eyes gleaming with glee, he said again, slower this time, “I’m not playing the top. The role is for the bottom.”

Well, there was no way he could mishear him that time. It was as clear as day. Kacchan…had taken the role of the bottom in a BL. Mouth hanging open, Deku stared stupidly at him for a moment then sputtered, “B-But you said that-“

Waving a hand dismissively, he cut him off, “Doesn’t matter. Come on, help me out, Deku.”

“Do…do you want me to give you some pointers or-“

“I want you to fuck me.”

That blatant, unabashed, unashamed demand came so far out of nowhere that Deku had to seriously consider for a moment if he hadn’t fallen asleep on the couch and was currently having some kind of bizarre dream. Kacchan not only playing the bottom in a BL…but requesting that Deku fuck him in real life…the brat – the arrogant brat who had the personality of a high school delinquent on a good day – wanted to be held by him? What…what the fuck was going on here? Had he walked into some kind of alternate dimension or something?! If it was anyone else, he would’ve thought it was a joke but this…this was Kacchan. There was no way he’d joke about something like this! Was he sick? Had he gotten into an accident on the way home?! Did he need to go to a hospital?!

“Oi.”

Kacchan’s annoyed snap wrenched him back to reality. Straightening up with a sharp gasp, Deku sputtered something incoherent that not even he was completely sure what it was supposed to be. Rolling his eyes, surprisingly still looking amused, Kacchan dropped the script. He stepped around the corner, reaching out to snag Deku’s arm. The warm brush of his calloused palm over his skin sent a bolt of tingling racing up his arm. Without a word, Kacchan pulled him back to their bedroom.

Too stunned by the bizarre series of events, Deku didn’t resist when Kacchan pushed him down onto the bed. Grinning widely, his beautiful bright eyes dancing with roguish glee, he started stripping, revealing a gorgeously toned, tanned body that Deku instantly wanted to lick and kiss all over. That heat pulsing in the base of his belly had died out in all the confusion. As Kacchan shoved down his jeans and underwear, allowing his large, thick cock to fall out, it came roaring back in, stronger and hotter than before. He went from a slight stiffy to rock hard within a single sharp breath. Precum leaked out of the slit, soaking through his underwear and sweatpants. Deku started to tug off his own clothes without really thinking about what he was doing. Kacchan always got cross with him if he lagged behind so it was best to get with the program. Before he had time to slip off his sweatpants, a now fully nude Kacchan hopped up onto the bed. Grabbing hold of his arm, he abruptly switched their positions, flopping down on the bed in front of him while gracefully navigating Deku between his legs. His crotch bumped lightly against Kacchan’s, sending an electric shiver racing up his spine as he came into contact with that incredible heat. His eyes widened in surprise. It wasn’t unusual for Kacchan to get hard without hardly any input from him but…he was already so wet. Precum soaked his gorgeous length, gliding down the thick shaft to dampen the unruly mess of blond pubic hair at the base.

“You’ve done this before, right, old man?” Kacchan rasped, lightly rubbing his foot against the small of his back. Lying back against the pillows, looking far too coy for Deku’s liking, he curled his leg around him, drawing him in even closer.

“You…you’re serious about this?” Deku gawked down at him, still unable to believe that this was actually happening.

Kacchan gave him an unimpressed, annoyed look. Sighing irritably, he gestured at himself, “Do I look like I’m joking?”

“N-No but-!”

“Oh, for fuck sake! Take it out already! Come on, I know you wanna fuck me so hurry the fuck up!” Kacchan snapped.

He grabbed hold of the hem of Deku’s sweatpants, wrenching them down to allow his twitching erect to bounce free. Deku let out a startled yelp. Mouth twisted into a furious snarl, Kacchan curled his warm fingers snugly around his length. Hooking an arm underneath his leg, he pulled it back until his knee was at his chest. With a deftness that was a little startling, he raised his hips up slightly, leading the head of Deku’s cock to his entrance. Everything happened so quickly, Deku could hardly keep up. The realization of what was happening only slammed onto his shoulders when he felt the tip of his dick pressing against Kacchan’s hot skin.

“W-Whoa, wait-! Wait, Kacchan-!” They couldn’t just jump into it like this! He could tell just from this light touch that Kacchan was ready yet!

“Shut up! I ain’t gonna wait! Hurry up and-!”

Huffing irritably, fed up with Kacchan always bulldozing through these things without stopping to consider how other people felt, Deku grabbed hold of Kacchan’s wrist, yanking his hand away from his cock. Jumping slightly, Kacchan looked up at him with wide eyes. There was a beat of silence then that coy grin was back of Kacchan’s brightly flushed face. Easily pulling his hand free of Deku’s grasp, he pulled up his other leg, shamelessly displaying himself in front of Deku. Fresh heat poured into his face. He could feel the color rising from his jaw to his hairline. His cock twitched eagerly, throbbing and pulsing with a near crazed excitement. This was really happening…Kacchan was really going to let him fuck him. Sucking in a deep breath, Deku scrubbed a hand over his face. He couldn’t keep up with this kid. Every time he thought they were on even footing, Kacchan did something like this, sending him stumbling backwards in surprise.

Well…whatever…

Deku dropped his hand away, settling a stern gaze on Kacchan, who, to his surprised delight, did lose a little of that impishness. If Kacchan wanted to get some practice in for playing the bottom, then maybe it was time to show off his more dominant side. Reaching over to the bedside table, very aware of Kacchan’s gaze following him, Deku fished the bottle of lube out of one of the drawers. He squeezed a good amount of the clear liquid out onto his fingers, rubbing them together to warm the goo up. Shifting closer, resisting the urge to grin in satisfaction when Kacchan audibly gulped, Deku brought his drenched digits down to his hole. He pressed the tip of one finger to the puckered entrance. His gaze flickered up to focus on Kacchan when he shivered in response. A burst of tingling desire radiated out from his crotch when his eyes settled on Kacchan’s heavily flushed, sweaty face. Bright red eyes, already hazy with lust, stared down at him, open and eager with how much he wanted this. Somehow keeping a calm, even expression on his scorched face, Deku tentatively slipped a finger inside.

“A-Ah-!” Kacchan gasped, his hips rolling slightly.

With everything moving so quickly, he had expected for it to feel as though Kacchan was trying to push him out but to his surprise, his hole immediately started suck him in even deeper. Intensely tight heat clamped down around his digit. Oh, this was so bad for his self-control. Every nerve in his body was screaming at him to take his finger out and replace it with his aching cock. Biting down hard on his tongue to distract himself, Deku eased his finger in even deeper, hooking it slightly to grind against his interior walls. There was no way he was throwing in the towel now. If Kacchan wanted the full bottom experience, then he was going to give it to him. Kacchan moaned loudly, his muscular thighs trembling. An immense pulse of heat rocketed out from the base of his belly. Fuck…fuck, Kacchan sounded so fucking sexy. Those gorgeous sounds really were going to be the death of his self-control! Swallowing down a mouthful of drool, Deku pushed out a harsh breath through his teeth as he leaned down to train a line of sloppy kisses across Kacchan’s midsection. He slipped further up to drag his tongue across one of Kacchan’s adorable pink nipples, shivering at the loud gasp that pulled from his lips.

“You’re making such cute sounds, Kacchan.” Deku rasped, pulling out his best top voice in an effort to hide how much he wanted to be buried inside that welcoming heat.

To his dazed, delighted surprise, Kacchan jerked and flushed an even brighter shade of red. Wrenching his head away, he murmured, “Sh-Shut up-! Stop that with your f-fingers-! Put it in already-!”

“Eh? But I’ve got to make sure that you’re ready.” Deku chuckled, slipping another finger alongside the first. It slid in easily, stretching his hole open even further. Clenching his teeth together in a strained snarl, Kacchan writhed and gasped underneath him, dragging his blunt nails down the length of his back. Deku panted heavily, his gaze focused intently on Kacchan’s flushed face. He thrust both fingers in and out of his entrance, enraptured by the way the spasming interior walls clamped down and squeezed him. Cute…cute, cute, cute-! His Kacchan was so cute-! He was so unbearably cute-! Fuck…this was so bad…this was so seriously bad-! Kacchan’s hole was softening, stretching in response to his fingers but he

Growling low in his throat, his lust dazed eyes swinging around to glare up at Deku in the most sublimely cute pout, Kacchan grabbed hold of the back of his head, wrenching him up into a rough, hungry kiss. Pulling away with a sharp gasp, Kacchan snapped, “Put it in. Fuck me.”

There was a certain power, a distinct sway that Kacchan had over him that was never so obvious than in that exact moment. As soon as those words registered in his muddled mind, somehow managing to wriggle through the loud shriek of defiant lust that demanded he give Kacchan exactly what he wanted already, Deku was halfway through sliding his fingers out of his hole before he registered what he was doing. He froze in spot, his thundering heart and the pronounced heave of his chest being his only movements. Kacchan glared at him with those bright, beautiful red eyes, ordering him to move, to give in. After a moment of staring back, Deku slowly let out a breath. Normally, he would give in without a fuss…but today, well, Kacchan had said he wanted to practice, right? While he hadn’t looked at the script, he got the feeling that this wasn’t the type of behavior that the bottom in the drama CD should be displaying. What kind of senpai would he be if he didn’t make totally sure that Kacchan was ready for this new role?

Swallowing against his thundering pulse, Deku exhaled slowly. He reached back to curl his fingers around Kacchan’s wrist, pulling his hand away. He gently pinned it above Kacchan’s head, staring him straight in the eye as he moved. It would be best to continue prepping Kacchan for a while longer but…he wasn’t sure if his self-control could hold through that. If he was going to give into Kacchan’s demands, might as well do it on his own terms, right? Leaning down to gently press his lips to Kacchan’s in a sweet, seductive kiss, Deku slipped his tongue into his mouth, swiping it over the roof, the sides to fully indulge in the delicious flavor. Moaning low in his chest, Kacchan pushed up into him, immediately trying to deepen the kiss. Jerking away with a soft chuckle. Gently nuzzling against Kacchan’s cheek, Deku easily pushed away Kacchan’s other hand when he tried to grab at him.

“Now, now, Kacchan.” He cooed into his ear as he was shifting into position, leading the head of his throbbing cock to Kacchan’s twitching entrance, “You’re supposed to be practicing, right? Why not try asking me shyly, hm?”

“Hah? What nonsense are you-OOOH!”

Grinding harder against Kacchan’s hole, just barely slipping the tip inside, Deku lightly nipped at his earlobe, “That’s not right, Kacchan. Come on, you took the role and wanted to practice so show me…let me hear the voice you’ll use when you’re recording…”

“Mnngghhh! You got a lot of nerve, old-!”

“Do you want me to stop?” Deku asked, pulling his hips away. He gazed sternly down into Kacchan’s flushed face. This was dangerous…he might get addicted to seeing how frustrated and needy Kacchan looked. Would he even let him do this again after this one time? No, he couldn’t think about that right now. It would only excite him more. Calmly holding Kacchan’s gaze, more than a little impressed with how composed he was managing to be as the heat bubbling inside his belly wailed like a cat in heat, Deku patiently waited.

“No.” Kacchan ground out.

Pushing in close to gently cup Kacchan’s burning hot cheeks, Deku leaned in to press a kiss to the corner of his lips, “Then show me.”

Kacchan stayed silent for long enough that he was beginning to think that he wasn’t going to get it out of him then a trembling arm wound loosely around his waist. His legs wrapped snug around the small of his back, anchoring them together. Hot breath washed across his ear as Kacchan lifted his head, bringing his mouth close. He drew in a shuddery inhale and whispered in a rough, whimpering voice, “Please…I need it. Fuck me…Izuku-san…”

In all honesty…that had been what he was asking for so it wasn’t like he had anyone to blame but himself. Really, he probably should’ve seen this coming. Eyes widening, a burst of fiery lust blazing a trail from his crotch to his mind, where it completely overwhelmed his ability to think rational, tossing him back into a primordial state. Wrenching back, Deku grabbed hold of Kacchan’s jaw, jerking his head over so he could smash their lips together in a rough, possessive kiss. As Kacchan was moaning loudly, with a tiny hint of triumphant that he only minutely took note of, Deku rammed his hips forward, finally driving his aching length into the welcoming heat of Kacchan’s hole. A loud squeal poured into his mouth. Something wet and hot splattered against his belly. Kacchan shuddered underneath him, his larger, muscular body tensing up from his shoulders to his toes. Deku paused, blinking slowly.

…eh?

…………..eh?

Pulling away from the kiss, Deku’s gaze landed on Kacchan’s dazed, flushed face then traveled further down to his stomach and crotch. He blinked. Splattered across Kacchan’s tanned, sweaty skin were thick ropes of white. One particularly long strand was still connected to the tip of his twitching member.

“Eh?” Deku mumbled quietly, “Kacchan, did you…?”

A large, trembling hand landed smack in the middle of his face, cutting him off mid-sentence.

“N-Not a word…scum…” Kacchan panted.

“It’s okay, Kacchan. You just got overstimulated! It’ll-.”

“I said not a word!” Kacchan snapped, pulling his hand away to glare up at him, “Just shut up and keep going!”

Blinking rapidly, his muddled mind finally starting to catch up with the current situation, Deku stared quietly down at Kacchan for a moment then giggled. Kacchan opened his mouth, definitely to spit out another demanded he be quiet but Deku leaned down to capture those sweet lips in another kiss before he could say anything. Curling his hand around the back of Kacchan’s head, he dragged him in even closer. As Kacchan was starting to melt into his touch, the tension easing out of his muscular body, he began to slowly, carefully pump his lips. Kacchan shuddered and trembled underneath him, his legs curling tighter around his hips, making it difficult to move. His insides clamped down firmly around him, sucking him in deep, stroking him with an intensity that made his head swim. Brilliant, tingling pleasure scorched its way through his nerves, overwhelming every inch of his body. This…it was so different than being held by Kacchan! The sensation was so intense…he couldn’t-!

“Kacchan-!” Deku choked out, burying his face in the curve of Kacchan’s shoulder. He slammed his hips forward. A hard shudder wracked his body. Pleasure burst out from the base of his belly, flowing throughout him as he spent his orgasm all over Kacchan’s insides. White washed across his vision. What little breath he had managed to gather into his lungs rushed out of his mouth in a gasping wheeze. One of Kacchan’s large hands landed on the back of his hair, stroking through his sweaty hair.

“Minute man…” Kacchan murmured teasingly.

“Says the one who came as soon as I put it in.” Deku responded lightly.

“Shut up.” Kacchan growled without any real heat. Turning his head slightly, he pressed a kiss to his temple, “You all worn out or are you good for another round?”

“G…give me a second…”

Snorting, Kacchan asked playfully, “Aren’t you supposed to be helping me practice?”

“That is the plan but I won’t be much help if I give out here. Give me a break – youngsters like you have more energy than an old man like me.”

“Yes, yes.” Kacchan gently stroked the back of his shoulders, nuzzling closer, “Take your breather then…show me more of that bold part of you.”

“Only if you show me more of your submissive side.”

“We’ll see.” Kacchan said dismissively, “I’ve got my pride, after all.”

Chuckling low in his throat, Deku pushed up to smile at his adorable Kacchan, “Guess I’ll have to pull it out of you like last time.”

Kacchan’s eyes widened then a broad smile spread across his face, “Bring it on, old man!”