Work Text:
Katsuki had always been obsessed with Eijiro, especially his teeth. Those sharp teeth that sent his mind reeling every time he flashed them, every smile, every word punctuated with a mouth open too wide, every time he sank down on his knees and took his cock in like it was the best meal he’s ever had.
The hyperfixation opened a new world to Katsuki. He was sucked right in. Nothing got him off faster than playing with Eijiro’s teeth. He was getting fucked? His fingers are in Eijiro’s mouth. Getting head? Comes as soon as he runs his tip across his closed sharp teeth. Just making out? Ruins his underwear the second those teeth are embedded in his skin.
Nothing compared to it. Until he found out about oral hyperfixation. One second, he was scrolling on his phone, bored out of his mind, and the next he went down the rabbit hole that is Red Riot’s fanbase. Some fans were normal, wholesome even, while the others were horny bastards, thirsting over Eijiro like he was a cold glass of water in a hot desert.
They started off fairly normal, with them going crazy over his abs, or his arms. Nothing out of this world. Then it progressed into people showing their masochist sides, something about how sharp he gets, how he could cut them up and stitch them back together. Someone even went into excruciating details about carving his name into their skin, his hardened hand digging into their wrists as Eijiro, no, Red Riot, held them above their head. How it would dig into their skin and leave cuts and bruises. How they would proudly show off their wounds.
It made Katsuki laugh. He got all that treatment and more and they didn’t even know it. They could drool over the idea of Red Riot, but they would never get anywhere close to his Eijiro.
Twitter especially had some wild comments, he stalked multiple accounts for the whole day. The more he interacted with the posts, the more they kept showing up. Each one dirtier than the last. He made sure to use his burner account, he didn’t want anyone seeing him retweet “Me, Red Riot, his hardened cock and blood as lube.”
It was all okay until he got to his favorite part, his teeth. Jealousy hit him harder than he expected. People were dreaming about his teeth, wishing he would bite them, make them bleed and leave scars as a reminder. But none of them got to have that, he, and only he, did. He had actual scars as a reminder. One on his nape from their first time when Eijiro couldn’t hold himself back when he came. He learnt how to control his bite force after that, but Katsuki loved the scar more than anything.
Some of those tweets involved him as well.
They weren’t public with their relationship, but they could only hide it so much with Eijiro and his possessiveness. He was always touching Katsuki, either an arm around his waist, or shoulders pressed up against each other. They couldn’t hide the bite marks either, and Katsuki somehow always ended up with at least one purple teeth mark on display. Eijiro with his barely there costume wasn’t very good at hiding the scratch marks on his back, or the hickeys.
Their relationship wasn’t the best kept secret. Their fandom was fully convinced of their relationship. It was fun seeing them go crazy over a head kiss Eijiro kept placing after taking down villains, or getting caught on dates.
Some accounts were tweeting about their cute moments, he didn’t skip over those. He liked every single one. Some were tweeting about the looks they sent each other, the thirsty ones, the “you’re getting fucked after this is over” ones. They caught every single glance, every “fuck me” eyes, every brush of a hand lower on his back than socialy acceptable, or higher up his thigh to be deemed as an accident or a hand on the knee. They caught the way Katsuki looked up at him when they were standing too close, the way he opened his mouth while slightly making his eyes cross, the way Eijiro’s chest stuttered on a breath.
They made speculations about what they got up to in the privacy of their bedroom if they were already showing off so much in public. If Red Riot was allowed to place his hand on his neck during an interview, thumb just about wrapped around his throat, maybe they were into choking. Or how Eijiro was able to shut Katsuki up with a single look, how his eyes lost focus after a stern tone of Eijiro’s voice, that meant Katsuki was the sub, and he was so used to subbing that one singular look was enough to push him under.
They were right, especially about his stares at Eijiro’s teeth. They had seen the way his eyes always lingered on them, the way his breath hitched and he touched that bite scar on his neck every time Red Riot snarled at a villain.
Most tweets were about that. He kept seeing the same concept jump up. “Red Riot bites Dynamight to stay quiet when they fuck in public places,” retweet, “Red Riot presses on Dynamight’s bite marks to make him shut up when he talks back too much,” retweet, “If Dynamight’s neck is this covered in hickeys, imagine places we cant see. His thighs!!!!! Theyre prob all bruised yall,” retweet. And the one that did him in, “Dynamight cums when RR flashes his teeth at him.” Retweet, because yes, he does come when Eijiro’s teeth are anywhere near him.
He was fine, considerably, until he saw their username, “redriotssharkteeth”. Intrigued, he checked their page. Most of their posts were pretty vulgar, ranging from places they probably fuck in to possitions they do it in. They even have kink analysis from the way they act in public. It was pretty accurate, minus some minor details. They got the dominant Eijiro part right, and Katsuki being a brat sub. But his bratty moments are far behind him. Eijiro broke him in, taught him punishments are not always fun, they don’t always bring pleasure. He taught him the importance of doing what he’s told by Eijiro. He likes being good for him and he makes sure to be the damn best. Not that his bratty side doesn’t come out every so often.
Their tweets kept getting more and more accurate as he scrolled through. “Dynamight plays with Red’s teeth with his tongue.” He opened the thread. “He runs the tip along the sharp ridges, careful not to cut himself yet, saving that for the end. His hands roam Red’s chest, plays with his nipples, runs his fingers through the coarse black hair in the middle. His chest glistens with sweat, Dynamight’s fingers tremble as he snakes his hand toward his neck, up his jaw and rests it against Red’s mouth. Their mouths separate and Red lets out a truly desperate whine. Until, his fingers replace his tongue. He runs them over his sharp teeth, slides the index and middle fingers between his teeth and his cheek, strokes over the gums while his other fingers press on his tongue. Red opens his mouth wider, breathes through his nose. Saliva pools in his mouth, his head tips back so it doesn’t spill. Dynamight gathers some of it on his fingers and spears it all over his lips, lets it slide down his chin, over his throat. The sight is too much to handle. He needs more. His fingers hook on his lower front teeth as he pulls it down, his other hand holds his head back with his hair. His mouth splits impossibly wide, his spit flows out, stretches between his lips and pools on his chest, still connected to his chin.”
Katsuki has to put his phone away for a second. His dick is impossibly hard, aching in his sweatpants. He’s in a safehouse on a mission. He can’t afford to be distracted. He needs Eijiro. He would be breaking the rules if he called him now. But a week without hearing his voice, without having him all to himself is driving crazy. He has been horny this whole time, without any release. He needs his boyfriend. But his imagination is all he has right now, and that tweeter thread is really pushing all his buttons in the right way.
”Dynamight gathers some of the spilled saliva and smears it around, getting is all in Red’s chest hair. Red looks properly fucked out, his eyes look up at him, pupils blown wide and hazy. He’s breathing erratically, soft moans escaping here and there. Dynamight leans down to kiss him. His tongue darts out, ready for something. “Fuck, baby, you want me to spit in your mouth?” Red nods with a whine. Dynamight is impossibly hard, his cock straining against his waistband. He’s sitting in Red’s lap, his cock pressed against his ass. Red’s hands are holding his hips down, moving him in slow circles, enough to give them both pleasure, but not enough to cum. Dynamight tilts Red’s head back, gathers spit in his mouth, lolls out his tongue and lets it drop down onto his boyfriend’s waiting tongue. He laps it all up, pushes himself up so he can lick into the blonde’s mouth, suck up everything that’s left. He moans as he sucks his tongue in, swirling his tongue around. He pulls away, but not before scraping his teeth on the surface. He could taste the metallic taste of blood oozing out of the cuts. Red couldn’t hold himself back, he held Dynamight’s hips down as he ground up onto his plush ass. That was all they needed as they came in their boxers, with blood and saliva mixed in their mouths and spit covering their chests.”
Katsuki felt like he was going to pass out. He needed something. Anything. Fuck. His mind was reeling, thinking of all the possibilities. He could break the rules and call Eijiro, could jerk off on call. He brought a dildo, he could fuck himself with it, call Eijiro while cockdrunk, blame it on the hornyness. Or he could shove the dildo down his throat, call him then, make him wish it was him fucking his mouth.
His hand made it’s way up to his mouth, all the rational thinking left his mind. His fingers parted his lips and pushed in. He moaned at the sensation of being filled, even if it was barely anything. He would take all he could get. His tongue curled around the digits, slid between them, moved them around, then he sucked on them. It wasn’t enough, it didn’t make him gag, or made his eyes water. He pressed them down on the back of his tongue, slid them towards his throat. Fuck. Nothing. Not even a small gag.
He got up angrily, stomped over to his suitcase and pulled out the dildo from the hidden compartment. It was a small, clear dildo, a little realistic with veins running down it. Nothing even close to resembling Eijiro’s massive cock, but it would make do.
He stripped fully on the way back to the bed and went down face first. He put the dildo on the pillow, balanced it with one hand around the balls and leaned over it. His ass was up in the air, arching his back as he licked the tip, just the way Eijiro liked, circled the head before sucking it in. He focused on the tip, mouth sliding up and down, pushing it into his cheek, taking it back out and kissing down the side before sucking it back in again.
His mind was going blank, his cock bounced with every twitch between his legs as precum rolled down his thighs. He bobbed his head faster, took in more of the clear silicone. The head pressed up against his throat as he swallowed around it. He forced his head down, it slid down his throat, until he could feel the balls pressed up against his chin.
He fished around the bed blindly for his phone, held it up to his face, typed in the password with shaking fingers, pulled up Eijiro’s number and pressed call. The line rang for a few seconds. He set the phone against his headboard, making sure his face was in full view, his ass visible behind his back. He arched higher, he wanted to look perfect for Eijiro. The redhead picked up, obviously just woken up. “Huh? Wha?” His voice was raspy, it made chills run down Katsuki’s spine. Eijiro’s eyes found Katsuki’s through the screen. Soft breath escaped him. “Fuck Katsuki.” He could see Eijiro’s head tilt back, obviously trying to wrap his mind around what was happening.
Katsuki sucked harder, sloppy sounds filled their rooms. Eijiro’s head snapped back up. “Did I give you permission to do that?” Katsuki stopped dead in his tracks. Fuck. “Did I let you take the dildo? You’re such a fucking slut, can’t even wait a week without stuffing your mouth full, huh?“ Katsuki moaned around the dildo. The words went straight to his cock as it bobbed uselesly and dripped more precum. “Katsuki.” There was that demanding tone. “Take it out. Now.” Shit. He slowly slid off the dildo. He felt so empty without it. He needed Eijiro and his stupidly big cock to come and fill his throat up.
“Missed you.” He mumbled, trying to defuse the situation. He could feel anger bubling up in Eijiro even through the screen. He heared the deep breath he took to try and calm down, saw his eye twitch, his eyebrow furrow in a way that wasn’t just pleasure.
“Obviously you didn’t miss me enough to fill your filthy mouth with something that actually resembels me. If you wanna act like a slut, at least do it properly.” He wished he could. He knew he should’ve brought the repica dildo of his boyfriend’s cock. But he didn’t wanna risk the airport security catching on, so he brought the most descreet one.
”Didn’t bring anything bigger.” He said under his breath, more whine than actual words.
“What did you say? I didn’t hear you. What, you can’t even speak right anymore?” Katsuki has never been into degredation, but something about this was making his cock fill out impossibly fast. He wanted to wrap his hand around himself, or fuck into his matress. He regreted arching this far up, his dick couldn’t reach anything.
”Didn’t bring anything bigger. Eiji please, fuck. I need something baby, anything, I don’t care. I will do anything. Please. Let me cum. Make me cum.” He was babbling nonsense now. Anything to get Eijiro to let him fuck his throat.
“Yeah? You need it that bad? Prove it. Imagine it’s me. Don’t you dare bring your mouth close to me before I give you persmission. Got it?” Katsuki nodded.
He wrapped his hand around the base as he jerked him off slowly. It was hard pretending this was his cock and not some dildo, but he didn’t care. He would do anything to please him.
The dildo was already wet with his saliva, his hand slid easily down it’s shaft. He held eyecontact with Eijiro as he opened his mouth. His tongue slid out for show, as a whine followed. He wiggled his ass in the air. Eijiro’s eyes were black with arousal. Katsuki could see his shoulder moving, could hear shuffling behind the phone.
“Wanna see you too. Can’t imagine it’s you when I can’t even see you properly.” This was obviously the wrong thing to say. Eijiro put the phone down, camera facing the ceiling.
“Oh, you’re making demands now. You’re in no possition to want anything from me. I’m already letting you touch the dildo and instead of thanking me you’re asking for more?” He tutted. Katsuki felt impossibly close to cumming without touching himself even once. But he knew he was gonna get in trouble if he came without permission. He would be lucky if he was allowed to cum at all.
”Ei. Ei. Ei.” He let out little breathy whines. “Please Eiji, I need you. Feel so empty. Can’t even feel the streach from the last time we fucked.” Tears slid down his face. “Need your cock in me. Need you to fuck me full, make me feel it for weeks.” His free hand pushed into his mouth. “Need your fingers in me, they feel so much bigger, so much heavier.” He said around his digits.
He could hear Eijiro shuffling faster, stoking his cock with vigour. And then the camera shifted as Eijiro’s whole body came into view. His shirt was off, his boxers off one leg, dangling on the other ankle. His hand was fisting his cock. And oh. That cock. The sight of it sent Katsuki into a frenzy. His hand stroked the didlo faster, eyes trained on his cock. The tip glistened with precum, the veins popped up as Eijiro pumped himself faster.
“Take the finger out.” They slipped free, wet with saliva. “Mhmm, good boy. Reach behind you. Arch higher so I can see. Finger yourself open. Get yourself ready for my cock.”
The first finger sliding in was a tolerable stretch. His asshole was used to it by now. He added a second finger. The streach felt amazing. He moaned as he saw Eijiro’s cock drool more precum out. The redhead’s big hands smeared it around as he used it to soften the friction.
“Lick the head.” Katsuki immediatly leaned down to tongue at the dildo. He licked the slit, licked around the head, on the ridge just underside the tip. “Just like that baby. Feels so good.” Eijiro’s hand sped up as katsuki took the head in. Third finger joined the others. He found his prostate pretty quikly. He couldn’t hold back the moan as his fingers grazed the sensitive nerves.
“Yeah, baby, right there. Don’t stop fucking yourself on those pretty fingers.” Katsuki was going to cum. Every time his fingertips touched his prostate, he was brought closer to the finish line. He didn’t wanna cum yet. He wasn’t allowed to. His boyfriend didn’t give him permision yet.
He took in more of the dildo, bobbed his head faster. Went straight up to the tip and back down to the middle of the shaft. Drool was begining to gather on his pillow. His hand was competely soaked.
”There you go Katsuki. So close baby. Gonna make me cum. Wanna feel your throat.” Katsuki took the dildo down fully. He saw Eijiro’s hips buck up into his hand. “Fuck, you look so good like that. Yeah baby. Take me deeper. Fuck. Love it when you look at me like that.” He was looking up at the camera. His eyelashes wet with unshed tears, his cheeks hollowed out as he sucked harder. His eyes crossed slightly from pleasure. His hand sped up, hitting his prostate head on every thrust.
“I’m so close, Kat. Cum with me baby. Wanna cum down your throat.”
Katsuki took him in as deep as possible as he sucked harder. He moaned around the dildo. His fingers abused his prostate. His legs shook, his cock bounced, angry red, dripping and untouched.
“Gonna cum. You’re gonna make me cum. Look so fucking pretty baby. Can’t take my eyes away. Mmm...” He came with a broken groan. Katsuki followed close behind.
He slid off the dildo and threw it to the side, took out his fingers from his ass and wiped them on the ruined pillow before crashing down.
”…fuck.”