Work Text:
Izuku stares at the open book before him, the foreign words printed simply within, so unassuming. He gulps and slowly looks at the girls giggling around him. “Is this safe?”
The bubble gum pink haired one - Mina, he thinks - nods vigorously. “Totally! We’ve been obsessed with rituals and witch stuff lately, but none of these spells worked for us so you should be completely fine!”
“Oh yeah,” the quieter girl scoffs - Kyouka? - and rolls her eyes. “Perfectly fine - if you don't have magic.” She sips from her cup, ignoring the look of pure terror Izuku sends her way.
The brunette of their little group - Ochako, the one who invited him to this party - waves Kyouka off. “He’ll be fine! I didn’t sense a single magic bone in his body!”
Izuku looks down at the book of supposed spells again. The sound of the party outside the candle lit room is muffled, almost enough to make him forget why he came in the first place. Ochako said it was a simple Halloween party, where people were dressing up and having fun; typical college shit. He didn’t expect the girls of the house to all be dressed as witches - which was cute at first, until they pulled him into their creepy ritual room - and suddenly he began to question everything.
As far as Izuku has ever known, the world wasn’t full of magic and supernatural creatures. In fact, he never once considered these ideas to be part of his reality. Well, maybe when he was a kid and had a vibrant imagination that bled into his reality. But at just barely 19? Going to college to study history? Human, boring, basic history?
No. Izuku didn’t believe in magic.
Doesn’t. He shouldn’t. It makes no sense.
So knowing this, there would be no harm in reading from this book, right? It’s written in Latin that he sort of recognizes from last year’s mandatory course, and while he only took the class to complete his degree’s requirements, he did find the language interesting. Sadly, some of the words aren’t recognizable to him - he could pronounce them, sure, but what did they mean?
That was an answer he didn’t have.
“Well?” Mina chirps, pulling him from his musing. She’s staring at him expectantly, her perfectly manicured brow raising in question. “You can read it, right?”
“Y-yeah,” Izuku nods, licking his lips. He looks back to the book. “I just… I don’t know what some of it says. L-like, I think this is saying something about the soul and—”
Mina starts to shush him, waving her hand over the book to pull his attention back up to her. “Look, Izuku, sweetie - I don’t need to know what it says. I already know! I just need you to read it out!”
Izuku feels his gut tighten. This isn’t a good idea. “W-why…?”
“What does it matter?” Kyouka asks, heaving a sigh. “It’s not like you believe in magic, right? It won't hurt you to read it.”
He gapes at her, spine tingling with a chill that her words sent down his back. It’s normal to not believe in magic - anyone would assume someone doesn’t believe in it.
So why does he get the feeling she heard his thoughts?
“Kyouka is right,” Mina laughs, smiling sweetly at Izuku. “Now just go ahead and read this passage here,” she points to a section of the book, drawing his attention to it, “and we’ll let you go.”
Izuku can feel the sweat beginning to drip down his neck, his body chilling from the cold room. He shivers, trying to shake off the bad feeling settling over him.
“O-okay…”
He focuses on the words, recognizes the way the language works. Slowly, Izuku begins to read the passage, the words passing easily on his tongue but their meaning is still lost on him. As he reads, he feels the room grow warmer, and the air become tighter - but that must be in his imagination, right?
It was fine. He was fine.
By the time he reaches the end of the page, his tongue is heavy and his body feels on fire. Izuku takes a deep breath, trying to calm his suddenly racing heart as he looks up to the three girls dressed as witches.
With nothing else to read, Izuku’s voice comes to a stop and he stares at the three. They stare back. The air is thick and tense, and Izuku feels sweat dripping down his neck. The silence is deafening.
“Nothing happened…” Mina suddenly says, pouting as she crosses her arms. Ochako sighs and Kyouka shakes her head, taking the book back from Izuku gently. “Why didn’t it work?”
“I told you,” Ochako groans, pinching the bridge of her nose in frustration, “not a single magic bone in his body!”
“Well, yeah, but—”
“This isn’t even the right spell, Mina,” Kyouka huffs, shaking her head.
Mina shrieks, grabbing the book from her friend in a panic. “Oh Gods, then maybe it’s good it didn’t work!”
Izuku watches the three of them look through the book, almost as though Izuku were no longer there. “U-um… I’m gonna head back to the party…?”
Kyouka nods, flipping a page. “Enjoy yourself, and don’t forget; nothing happened here.”
Izuku blinks, confused. Well, yes, nothing did happen - whatever they were expecting, Izuku couldn’t achieve it.
Magic isn’t real.
He doesn't have magic.
Izuku doesn’t wait for another acknowledgement from the girls, turning back towards the door and feeling his last minute sheet costume brush against his fingers as he went.
“Oh, Izuku!”
He stops right when he manages to grab the door handle, unable to bring himself to ignore the cute girl who invited him. Izuku glances back, watching Ochako bounce up to him.
“Yeah…?”
“Thank you.” She smiles brightly. Izuku’s stomach twists, but not in the usual way it does when a cute girl talks to him - there’s something off about the feeling. “I hope you have a… good time at the party.”
“Uh… yeah, that’s uhm… usually what you do at parties, right?” Izuku questions.
“Ochako!” Mina moans, slightly shaking the book that’s in her hands. “I can’t find it! What page is it on again?”
“It should be on 143!” Ochako shouts back, before turning back to Izuku. “I should go help them, but really! Have fun, don’t drink too much, and remember—!”
“Nothing happened here,” Izuku parrots back, shaking his head a little at her excitement. With that, he slips from the supposed ritual room and finds his way back to the main party.
It’s louder than he remembers, but he tries to pay it no mind as he makes his way through the crowd and towards the kitchen. A solo cup filled with bright red punch is shoved into his hand before he can notice, and he takes a tentative sip. Sweet, with a slight burn at the back of his throat as he swallows. As he wanders back towards the main room, he practically downs half the cup.
Ochako has been the only one that he sort of knew at the party, and without her to hang around, Izuku was left alone in a crowded room. He settles in a corner of the room with the other wallflowers, sipping from their solo cups and watching the even drunker people dance their costumes off. He even laughs as one guy with a glowstick hat starts doing the worm.
Izuku’s taking a swig of punch when the string lights and blacklight bars start to flicker. It’s not enough to worry about, until it happens again for more than a couple seconds. Izuku looks at one of the string lights, little pumpkin bulbs flickering like their life depends on it. His stomach twists, and a strange breeze caresses his cheek. The music wavers before the sound and the lights cut off entirely.
Some girls start screaming, causing a frenzy of movement. Izuku manages not to spill his drink as someone knocks into him, and then, like it never happened, the lights snap back on and the music fades in once more, the party getting back into full-swing.
“Dude, what was that all about?” the guy with the glowstick hat asks, propping his arm on Izuku’s shoulder.
“Dunno,” Izuku answers, rubbing at his chilled cheek. “Maybe it was some kind of power outage? There’s a lot of parties going on, it might have overworked a circuit or something.”
“True…” Glowstick hat says, before brightening and turning back to Izuku, “hey, are you in electrical engineering? I am, and I swear I’ve seen you around!”
“Uh…” Izuku replies. “No, I’m a history major, actually…”
Wolf whistles pierce through the noise, everyone snapping to look towards the source of the sound. Someone had just walked in, tall and handsome, and no one could look away - least of all Izuku. On his head, amidst his spiky blonde hair, were two curled horns, and his top was just two sleeves that were barely covering his shoulder blades, clasped together at his neck. His fiery red eyes surveyed the crowd before they landed on Izuku.
“Woah, that dude looks like an RPG character!” Glowstick hat exclaims, forcing Izuku to break eye contact with the mysterious man.
“Y-yeah, a little, huh?” Izuku laughs, his body heating like it did in the strange room before. “He must really like Halloween to go all-out like that.”
“Right?” Glowstick hat laughs. “Man, I kinda hope there’s a costume contest, just to see him win. Kinda wish I put a little more effort into my outfit, though…” He trails off, adjusting his hat a little.
Izuku laughs before seeing people moving in waves next to him. Sweat is pooling at the nape of his neck again, and a shiver rolls down his spine. When he turns, he realizes that everyone was making way for the mystery man, who was stalking right up to him.
“Uhm…” Izuku hears himself say, looking around to see if there was anyone behind him. He starts to move to the side as well, but before he can, the mystery man has crowded him against the wall. One muscular arm is placed next to his head, and Izuku cringes away from him a bit, refusing to make eye contact.
Then, a hand that looks like it was dipped in ash registers in his peripherals. A taloned finger is crooked underneath his chin and forces him to look up. The man looked even better up close. Izuku couldn’t manage to look away, and at this point, he didn’t want to. He felt the heat bloom in his cheeks, air taught around them, just like it was when he recited that spell earlier…
“Here you are,” the man purrs, a devilish smile playing on his lips.
Fangs.
The man had fake fangs poking past his rosy lips. Lips that looked soft and inviting and Izuku couldn’t pull his gaze away from them.
“I’ve been looking for you everywhere.”
Izuku can only stare. The room has gone silent, and the sudden lack of sound has Izuku’s ears ringing.
Demon man is still smiling, though now one of his eyebrows raises in question. “You alright?”
Izuku can’t breathe.
“Izuku?”
Holy shit, how the fuck does he know Izuku’s name?!
“Damn, dude!” Glowstick hat exclaims, but the demon-dressed walking sex dream doesn’t take his eyes off of Izuku. “You’re hot as fuck!”
Demon sexy man snickers, his red eyes glancing over for a brief moment before locking back on Izuku’s face. “Of course I am - if you’ll excuse us,” he leans closer and Izuku nearly shrieks when he feels a hand at his back pulling him closer, “I have a meal to enjoy.”
Glowstick hat laughs, impressed. “Damn, ghost boy, get it, son!”
Izuku is lifted up against the firm side of the demon dressed man as he begins to walk from the room. Izuku looks down, finding his feet hovering over the floor as he’s carried away so easily. The crowd of people around them begin to hoot and holler, parting the way to the front door once again. Izuku is frozen in place against the man’s body, a firm hold on his waist as they go.
This has to be a joke.
It must be some stupid prank.
There was no way this was happening to him.
The cold October air hits his face, but the heat rolling off the man’s body keeps him from shivering. Izuku finally focuses back on his unfairly attractive face and notices the smokey ash paint on the man’s hands has been done along his neck and across his chin and cheeks. The man’s skin is hot, that much felt obvious to Izuku, and yet his skin looked smooth and soft, not a single bit of sweat coming from him. Meanwhile, the sweat that drips down Izuku’s back has gone cold from the chill in the air, though the sensation of it pooling along his body is amplified from being so close to him.
It was unnatural how warm this man’s body temperature ran, and Izuku had to ask. “How are you so hot?”
He grins and stops, looking at Izuku. They were now on the sidewalk in front of the house, and while Izuku can distantly hear the music and chatter has started again, he can see in his peripherals that many people have gathered on the front porch or in the windows trying to watch them. Izuku’s feet touch the ground, and he focuses his attention on the stranger before him.
“Are you talking about my looks or the heat of my body?” The man asks, his fangs on display. Izuku blinks, eyes adjusting to the light of the moon - why did everything look so… red? And did the man’s eyes really just fucking glow?
“O-obviously the heat!” Izuku answers, trying to pull away. “A-and anyway, who are you? What’s going on? W-why are you interested in me?!”
The man snorts, shaking his head as his hold on Izuku tightens. “Why wouldn’t I be interested in a virgin like you?”
Izuku gasps, his face pooling with heat and he can’t bring himself to look at him. How did he—
The taloned finger from before pokes against his chin, the point of the claw digging into Izuku’s skin and forcing him to look into the man’s eyes. Izuku shivers, his breath catching when he sees the way the man’s pupils dilate. Wait. Weren’t they just slits? Is that possible?
“My name is Katsuki, and I am the demon you summoned.” His voice suddenly feels different, hypnotizing even, and Izuku can do nothing except lean closer as Katsuki’s hand shifts to cup his jaw. “I belong to you, much like your soul belongs to me.”
Izuku can only nod before the words fully register with him. In the back of his mind, he knows he should object to these claims.
Demon? Summoned? Belongs to Izuku? His soul?! This was all outrageous, clearly some sort of stupid prank that someone decided to pull on him - probably whoever knew he was a virgin, and wanted to make fun of him by sending this sexy stranger to come mock him.
He can’t seem to fight it, though. Izuku’s body feels light, almost foggy as he tries to move without any success. Somewhere in the back of his mind he begins to panic, but there is an ease settling over him that makes him relax.
Katsuki’s thumb slides along his jaw, up to his lips. Izuku’s bottom lip begins to tingle as Katsuki touches him, and he watches mesmerized as Katsuki leans in closer to him. His breath hitches, and suddenly Izuku pulls himself away.
He stumbles, nearly tripping over his feet on the sidewalk. Katsuki stares, his expression unreadable. Izuku’s panic catches up with him, making him gasp for any air he can get as though he’d been holding his breath.
“W-what…?”
“How did you break out of that?” Katsuki asks. The sound of his voice has Izuku freezing - it wasn’t the same warm, caressing, and hypnotic sound as before. Instead, it triggers a flight response in Izuku, but his feet do not move. Katsuki steps closer, making Izuku flinch. He’s becoming painfully aware of the hard-on he’s got, and when that exactly happened, Izuku cannot remember. “Are you actually a witch?”
Izuku shakes his head frantically, glancing at the large home the party was happening at. No one was looking anymore, almost as though they stopped caring - but Izuku can feel it in the air, the threatening and powerful warding sense that anyone who comes near should turn the other way.
What was going on?
“What the fuck are you then?!”
“I-I don’t know!” Izuku stammers, holding his hands up. “I just - I’m just a college student who came to a party for the hell of it!”
Katsuki snarls, and his eyes - yes, they’re definitely glowing red now! But so is the rest of the world, the air thick with a power unknown to him. Izuku shakes, though somehow still fucking turned on - to be fair, Katsuki was unfairly attractive, even more so as he slowly became more and more terrifying.
“What’s going on?!”
“That’s what I’d like to know!” Katsuki takes another step forward. Izuku gulps, still unable to move as Katsuki hurries towards him. “Explain to me everything!”
“My dad left my mom when I was three, so I promised I would always be there for her, but when I started college last year it was really hard to leave home and—”
“Not that far back!”
Izuku isn’t even sure why he went that far back. “U-um… this cute girl in my math class invited me to the party her, uh… “sisters” were throwing tonight. I thought they were just a bunch of sorority girls, but now I think they’re actually witches - unless this is some stupidly elaborate prank and you’re not actually a demon—”
“Oh, I’m a demon alright,” Katsuki growls, holding up a hand. Izuku watches as a sparking ball of explosive flames appears in it, and Katsuki holds it out to shoot it towards a near-by tree. “Now keep. Talking.”
Nodding, Izuku focuses, recounting his experiences for the night - there wasn’t much, but Katsuki seemed to want the details for each event, and Izuku was great at giving details. When he finishes, Izuku bites at his bottom lip and shrugs, gesturing to Katsuki.
“Now… we’re here.”
Katsuki scoffs, crossing his arms and unintentionally drawing Izuku’s attention to his magnificently large chest. His nipples were particularly interesting, Izuku had to admit, and he did his best to not lick his lips or drool at the thought of them in his mouth.
“These stupid witches, they’re always fucking up their rituals,” Katsuki mutters. Izuku slowly pulls his focus back up to Katsuki’s eyes, trying his best to be respectful. “Especially that pink one, she can’t fuckin’ read Latin but keeps trying to summon shit to help her through her college classes - this is the third time this week she’s summoned one of us, ya know?”
Izuku blinks, staring at Katsuki as he looks expectantly at him. “Um… no? I don’t… I didn’t think magic was real until tonight.”
Katsuki raises a brow. “You have magic though.”
“No, I don’t.”
“You do,” he heaves a sigh, pointing to himself, “you summoned me.”
Izuku gulps. “W-wouldn’t that just be the witch's magic? I mean, I didn’t do anything except read some words!”
“You still summoned me. Their magic doesn’t work like that.” Katsuki gestures in a random direction, a scowl on his face. “Let’s go home, we can talk more about it there.”
“H-home…?”
“You summoned me, Izuku Midoriya,” Katsuki says, a lilt to his voice that curls around Izuku’s ears just like before but without the hypnotic feeling. “You need to understand the consequences of your actions…”
Izuku gulps, glancing back to the tree that was still on fire. “Can… can we put out that fire first…?”
Sighing, Katsuki waves his hand and the fire disperses, leaving behind a singed, sad little tree.
Nodding slowly, Izuku turns in the direction of his apartment and begins to walk without another word. Katsuki follows him, and Izuku tries not to think about how a sexy demon was coming home with him from his first real college party.
Izuku walks into his apartment sooner than he expected, flicking on the lights of the room and kicking off his shoes hurriedly. Katsuki shuts the door behind himself, the heat of his body rolling off of him in waves and making Izuku tumble into the wall, his left shoe refusing to come off.
“What the hell happened here?”
Izuku looks around at the mess of his room, his face burning in embarrassment. He didn’t exactly keep his living space tidy, clothes strewn about with papers and books sitting wherever he last used them. His switch sat plugged in on the floor next to his bed, which was really just a mattress and box spring (he just never got around to getting a bed frame, okay!) and the pillows were misplaced, one sinking off the side of the bed. His sheets, unfortunately, were victims of his frantic search before the party for a costume, now hanging ridiculously from his body.
He was just grateful his box of toys was stashed away in the linen closet of the bathroom.
“Um…”
Katsuki snaps, his boots disappearing from his feet as he steps into the main area of the room, looking around himself. Izuku stares as he pulls the hood of his makeshift costume down, having not realized Katsuki had a tail before now. It swishes back and forth, like an agitated cat, and he glares at the filth of the room like it insulted him.
“Do you not have a dresser or something?” Katsuki asks, flicking his hand in a way that results in the clothes floating up and zooming across the room into the unused hamper. “Or a table even?”
“I haven’t really taken the time to get furniture…”
Katsuki clicks his tongue, snapping his fingers at the bed - immediately, the bed is lifted onto a proper bed frame, and dark, silk sheets appear on the mattress. “Clearly.”
Izuku stands straight, angry at the judgement coming from this asshole of a demon. “Hey! I’m a college student, not a successful billionaire with too much time on my hands or some shit! I don’t have time to make things look nice or money to pay for nice things, okay?!”
“Calm down, nerd,” Katsuki snorts, manifesting a table and two chairs close to the small kitchen. He directs all of Izuku’s research for classes onto the table, glancing back at Izuku with an unimpressed look in his eyes. “I wasn’t expecting a whole lot - like you said, you’re a broke college student. Your world has changed a lot in the last thousand years, but that doesn’t mean I don’t fuckin’ get it.”
His anger quickly dies, and Izuku stares at Katsuki in surprise. “You… you’re a thousand years old?”
Katsuki clicks his tongue and rolls his eyes. “Something like that, demons aren’t like you humans. Anyway, enough chatting - let me lay down some rules here.”
Izuku frowns. “Rules?”
“You summoned me, there are rules to this.”
“Okay, what does that mean…?”
Katsuki heaves a sigh. “It means that I am here to do your bidding, but at a cost.”
“My… bidding?”
“Whatever you want me to do, I will do it,” Katsuki steps closer to Izuku, his ashen hand reaching out to poke Izuku in the chest. “But it’s what you want deep down inside, not what you seem to think you want.”
Izuku gulps, his face getting hot again as he remembers the way Katsuki came onto him at the party and his comment about Izuku’s virginity. “Wha… what do I want, exactly?”
“To be fucked senseless.”
Izuku yelps, clapping his hands over his mouth in shock. Katsuki raises a brow.
“Among other things…”
“What’s the catch…?”
“The price is your soul.”
Izuku shakes his head frantically. “I don’t want to die! Can I reject all of this?!”
Katsuki rolls his eyes, glaring off for a moment as though questioning his existence. “It won’t kill you, and if you’re worried about what that means for the afterlife, don’t worry - everyone ends up in Hell anyway. Besides, you’d just be mine when you get there.”
“So… can I reject it?”
“You already summoned me,” Katsuki gestures to the room, “and I already did this for you. Can’t turn back now.”
Izuku whimpers, looking around at the nice furniture. “Did I want all of this?” He eyes the bed in particular, wondering at his subconscious desires.
Katsuki hums, looking at the dark bedspread as well. “You weren’t specific, but yeah - you wanted all of this.”
“What else do I want?”
“To be fucked—”
“Other than that!”
Katsuki crosses his arms again, and Izuku does his best to not glance down at his chest. “You want a friend.”
Izuku feels the embarrassment and shame wash over him. “I - I have friends…!”
“Do you?”
He doesn’t.
Izuku had never really had friends, and moving to college had proven to be much the same. Before, it was because he was shy and considered a “mama’s boy” by many, making him a perfect target for bullies. Now, it was simply because he unintentionally isolated himself; it was easier that way, to be alone by choice than to accept the rejection that would surely come.
It was still hard to properly acknowledge this fact however.
Katsuki’s warm hand cups his cheek then, making Izuku look back up from the floor to Katsuki’s eyes. They weren’t glowing this time, and his pupils had become slits again. There was something warm in the way he looked at Izuku, and it helped a little to see that.
“You want a best friend - a companion to spend your life with,” Katsuki continues, his expression soft and inviting. “You want a lover.”
Izuku bites his bottom lip, chewing at the skin as he considers this information. “Well… doesn’t everyone want that?”
“No,” Katsuki brushes his thumb over Izuku’s cheek, though this caress felt comforting rather than a sexualized one. “Plenty of humans have summoned demons like me, and most of the demons come back after only one night.”
“Oh…” Izuku pulled away from Katsuki to look at the room again. “So… you’ll be here forever?”
“Until you die,” Katsuki shrugs, “or until you no longer want me around. And when you do die, I’ll have your soul.”
Izuku considers this, his arms tucking around himself. The idea sounds nice, but Katsuki was a demon - he could be summoned at any time to do another’s bidding, right? Izuku’s soul would be bound into this, but that didn’t mean the same for a demon.
“A demon that is summoned for the purpose of meeting the spellcaster's deepest desires cannot be summoned again until the desires are all completely met.”
Izuku’s hold on himself tightens as he looks back at Katsuki. “So… it’s sorta like a soul bond?”
Katsuki nods. “You and I will always be connected, until you no longer desire that.”
“And when I die and my soul becomes yours in Hell?”
“Then I do not need to complete another deal, so long as your soul remains with me.” Katsuki’s brows furrow together, his expression becoming sullen. “And that could only happen if your soul ceases to exist.”
Izuku feels cold at the idea. “Why would that happen?”
“I would rather not think about that possibility.”
He licks his lips, looking around his studio apartment to consider the situation again. Izuku knows if he looks at Katsuki for too long, his own horny desires will outweigh all the logic and any long term decisions he makes. Yes, he knows he would love to be fucked senseless one day, but does he want that now? And with a stranger - a drop dead gorgeous stranger, one who happens to also be a demon? What would this mean for Izuku anyway? Does this mean he’d be dating a demon? Or would it be purely a sexual relationship?
Katsuki did say he knew Izuku wanted a friend, companion, and lover…
He didn’t know Katsuki. Katsuki may know his deepest desires with his demonic power, but would that really count as him knowing Izuku?
“Are you actually wanting this?”
Katsuki laughs, short and off-guard, as though he hadn’t expected that. “Are you really concerned about a demon’s consent?”
“I’m concerned you’ll be forced into something you don’t want,” Izuku mumbles, his body hunching a little in embarrassment. “I… I want to have sex, I want to be f… fucked, especially if it’s by someone as hot as you - but…! I want there to be more meaning to my relationships. And if you’re here to fulfill all my desires, and one of them is a relationship, does that really count? Do you want that relationship? Am I forcing you—”
“Izuku.”
His jaw snaps shut and Izuku squeezes his eyes shut, his shoulders bunching up as he tries to shrink away further in his embarrassment.
“Your desires are to be fucked, and since meeting me, you desperately want it to be me who does exactly that,” Katsuki says simply, making Izuku groan and fold down into a squat, the perceived rejection mixing with the mortification he’s been outed so easily. “But your desires for a friend or a companion, a lover even - those don’t have to be me. Are you trying to ask me to fulfill those desires myself, or would you rather find someone else for those roles?”
Izuku’s eyes snap open and he nearly stumbles back onto his butt. He stares at the floor, confusion weighing over him. “You… you mean you’ll help me form relationships…?”
“If that’s what you want,” Katsuki huffs, and Izuku hears him shift behind him. “If you decide you want it to be me, then I could probably do all of that,” his voice is closer, and Izuku thinks Katsuki might have squatted down as well, but he can’t bring himself to look. “Until then, how about we take care of you tonight? You’re still a little hard, aren’t you?”
Izuku’s ears are burning and he feels the whine in the back of his throat before he can really hear it. He hadn’t thought about his erection from before and honestly thought it had died down, but no, Katsuki was right - Izuku could still feel the lingering sensation of his arousal. “How did you know…?”
“That name of yours really should read as Deku,” Katsuki scoffs, sounding a little annoyed. “What part of “I’m a demon” did you not get?”
“Deku…?”
“Blockhead,” Katsuki knocks his knuckles gently to the back of Izuku’s head, “a useless little doll.”
Izuku purses his lips, glaring at the floor. “I’m not stupid.”
“Then stop acting like a Deku and let’s fuck already.”
His words are sharp, and the very idea of it all sends electric thrills through Izuku’s body, straight to his groin. He shivers, trying to consider his options one final time.
This could all be meaningless sex, and nothing could come from this unless it naturally developed like that, right? That’s what Katsuki said. And if Izuku is really being honest with himself, losing his virginity to a sexy fucking demon who knows exactly what he’s doing would really be the best thing that could ever happen to him.
So Izuku nods, licking his lips. “Y-yeah… I want you to fuck me.” He tenses when he feels heat at his back, his body relaxing as a familiar sense falls over him. His heart pounds as he unconsciously leans into Katsuki’s firm body, his knees hitting the floor and his head swims with the heat that engulfs him.
“N-no,” he mumbles, trying to pull away when he feels Katsuki’s tongue at his neck. “You… you’re manipulating me again…”
Katsuki hums, kissing his way to Izuku’s ear. “Do you want a clear mind?”
Izuku considers the question. The obvious answer was yes, but if he’s already consented, would it really matter? It should; he doesn’t want to be a limp doll throughout this, especially with it being his first time. But the sensations tingling throughout his body were interesting - almost like he’d be stimulated in some way the whole time, needy and waiting for more.
“Can… can you hold off until after the first time…?”
Katsuki snickers, kissing his ear. “You think we’ll go for more than one round?”
“You’re a demon,” Izuku says, turning to look at him. “I don’t think you’d be satisfied with just one round.”
Smirking, Katsuki nods. “So… clear headed and aware for the first time, then you’ll be my mindless little Deku for the rest?”
Izuku shivers at the teasing, nodding. “I’m yours. R-right…?”
Katsuki doesn’t answer, not with words. He moves to kiss at Izuku’s neck again, his lips and tongue leaving a searing path of heat along the way. Izuku closes his eyes, his head rolling to expose more of his neck, the feeling sending thrills throughout his body. He feels his abdomen spasm for a second at the light touch of a hand as Katsuki’s fingers skim up and under his shirt, the points of his claws skimming gently along Izuku’s skin.
Izuku jumps when Katsuki bites him, sucking at his skin and holding Izuku tighter. His neck is burning, but it all feels so good. Izuku’s lips part, a breathy moan spilling from his lips when Katsuki mouths at the bruise on his skin. His body falls back, trying to melt into Katsuki’s hold, his hips bucking when Katsuki’s hand slides back down to his pelvis.
He hears Katsuki’s fingers snap and the cloth that tickled his arms was suddenly gone. The button on his jeans pops open, Katsuki’s hand slipping past the seam of his boxers and over the soft curls of hair to grab hold of Izuku’s cock.
Izuku yelps, his hips bucking again as his body tries to chase the hand that holds him, and Katsuki snickers against his skin. He shushes Izuku mockingly, his other hand pushing at Izuku’s thin shirt, the soft cotton teasing his skin as it brushes over his chest and bunches just under his armpits. Izuku is trembling, pulse racing, his hips trying to move but easily stopped by the strength of Katsuki’s hold on him. His body has never been touched like this, not by anyone but himself, and everything felt like it was on fire under Katsuki’s hands.
Katsuki is kissing and suckling along Izuku’s neck still, his hand gently moving against Izuku’s rapidly hardening nipples and and the other squeezing and rubbing the base of Izuku’s cock. His pants strain as his dick hardens, and Izuku can’t hold back any of the panting gasps and moans that come pouring from his mouth. His body is being pulled back against Katsuki’s, and for a brief moment through his jeans, he could feel something poking his ass - Izuku could hazard a guess as to what it was, and he tries hard to wiggle his hips back against it again.
Too quickly, Izuku grows used to the stimulation of Katsuki’s caressing touches, and he whines impatiently, pulling away (and surprisingly being allowed to) so he could turn and face Katsuki directly. Without a second thought, he surges forward, teeth clacking against Katsuki’s, and while it did hurt, Izuku couldn’t be bothered to stop there.
He kisses Katsuki messily, winding his arms around his neck and digging his hands into Katsuki’s ashen blond hair. Izuku ignores the sting of his lips, or the taste of blood from what was no doubt a split lip, because within seconds Katsuki’s tongue passes over the sore and it all quickly dissipates into nothing. He presses in close, letting Katsuki overtake his mouth, their tongues brushing together in ways Izuku had only ever imagined before.
Katsuki winds his arms around Izuku’s back, pulling him in and their bare skin brushes together. Izuku's stomach tingles from the feel of Katsuki’s skin, but the bunched shirt under his arms is enough to have him pulling away and frantically pulling at the clothing, his head getting caught in his excitement. Katsuki huffs a laugh, helping him to pull it off his head.
“This isn’t a race, Izu—”
Another bruising kiss, this time without splitting his lips. Izuku moans into Katsuki’s mouth, his body now properly pressing against Katsuki and his beautifully squishy chest. His hands immediately find their way to Katsuki’s shoulders, his collar bones, unlatching the sleeved outfit to pull it away from Katsuki’s body. They don’t need to break their messy kiss this time, the sleeves falling away easily, and Izuku happily returns his hands to those collar bones, sliding down to cup Katsuki’s chest.
He does pull back to look, knowing damn well he had permission this time. Izuku licks his lips, watching the way Katsuki’s pecs squished under his palms, sitting so beautifully under his hold. Katsuki’s watching Izuku’s face, but for once Izuku feels no shame in his actions, his hands slowly slipping down to tease at Katsuki’s plump nipples he had nearly drooled over before.
“You’ve been wanting to get your hands on me since you first saw me,” Katsuki murmurs, leaning in to kiss Izuku’s jaw. He grunts, moaning softly against Izuku’s cheek when he tweaks his nipples again. “Fuck, Izuku - don’t fuckin’ stop…”
Izuku’s dick throbs at the words, and he can’t help his own little moan as he pinches and pulls at Katsuki’s chest. It felt amazing, just getting to touch a chest like this, and hearing the encouragement, the moaning, the satisfaction Katsuki felt from Izuku’s touch… it drives him crazy.
Heart in his throat, he pushes Katsuki back to the floor. Leaning over him, Izuku takes a moment to admire the demon prone beneath him. Before he could lose his own confidence, let his nerves get to him, or Katsuki grew bored and took charge again, Izuku rushes forward and latches his mouth onto one of Katsuki’s nipples.
Katsuki’s back arches up against Izuku, a low groan of satisfaction coming from him. Izuku licks the plump nipple, suckling at it happily as he palms the other. Katsuki moves under him, holding Izuku in place as he pushes up against him - something large, throbbing, and hard presses against Izuku’s thigh, and Izuku himself begins to moan at the very thought of how big Katsuki might be.
He may be a virgin, but Izuku isn’t a stranger to sex toys and playing with his own ass, that was for sure.
Katsuki’s chest was soft and warm, the feel of it in Izuku’s hand comforting, and his nipples were the perfect size for his lips to latch around - all this, while getting to enjoy the breathy moans and soft praises coming from the demon beneath him. Izuku’s arousal spiked, and he would gladly suffocate pressed against and between these soft pecs.
But Katsuki had other plans.
Suddenly, Izuku felt his own weight become light, and in his confusion, he pulls back from licking and sucking any more on Katsuki’s sensitive nipples to find they were floating. He squeaks, grabbing hold of Katsuki as they float over to the bed and land in the soft, silky sheets. Izuku lies stiff on top of Katsuki, his face smooshed perfectly between his squishy breasts as he registers the sudden change.
“Wha—”
“My turn,” Katsuki grunts, effortlessly flipping Izuku around to sit beneath him. The room grows dim with a flick of Katsuki’s wrist, and Izuku simply gapes up at him from his place in the sheets. Katsuki kneels perfectly between Izuku’s legs, his large hands sliding down to brush against Izuku’s jeans hanging low on his hips.
“W-what are you gonna do…?”
Katsuki smirks, licking his lips before he pulls at the fabric, ripping away Izuku’s clothes in one swift movement. Izuku felt dizzy, his body exposed and dick hard against his pelvis, and the reality of the situation began to weigh on him - although, he surprisingly felt calm.
“I’m going to have a little fun with you.”
Izuku gulps, nodding slowly. “I’m okay with that.”
Katsuki grins, his fangs prominent in the dim light. Izuku feels himself smiling back, watching Katsuki raise his hand and snap once more. Izuku blinks, trying to figure out what changed. It doesn’t take long to see that Katsuki had materialized one thing, and removed another.
A bottle of lubricant sits in his hand, a brand Izuku had only ever tried once and greatly enjoyed, but could not afford again. Izuku’s gaze slowly dipped lower however, and stopped the second he saw the large cock of the demon before him, erect and leaking with pre-cum.
Izuku’s jaw fell loose as his heart skips, and he wondered briefly how it would look to hold the thick shaft in his hands - fuck, just thinking about putting his mouth on it felt impossible. Katsuki’s dick was larger than any other Izuku had ever seen, the same markings of ash and darkness slipping down Katsuki’s small waist and converging at his lower abdomen, highlighting the two shallow grooves that lead to the base of his cock.
But his cock was not colored similarly - it had some dusting of the same markings that lined Katsuki’s body, but the cock itself was darker toned than Katsuki’s pale skin, reddening the closer to the head it got, and ribbed like one of the monstrous dildos Izuku had been eyeing on that sexshop website. The length and girth of Katsuki’s dick wasn’t too much larger than some of Izuku’s toys, and that was enough to have Izuku’s mouth watering with excitement.
“Katsuki,” Izuku mumbles, his voice soft, “please…”
Katsuki huffs and shakes his head, dropping the bottle of lubricant on the bed. It thunks against the wall, momentarily forgotten as Katsuki looms over Izuku, his heat encasing Izuku once more. “I still have a few things I wanna do first, Izuku… be patient…”
Izuku wiggles, trying to shift himself down to press against Katsuki’s dick, but he’s grabbed suddenly at his hips. Izuku’s hips are raised, Katsuki guiding him to lean back and hooking his legs over Katsuki’s shoulders, his dick now close and easily accessible to Katsuki’s mouth. Izuku’s eyes widen as he looks up at Katsuki, watching the way his demonic eyes trail over him before nuzzling his cheek happily against Izuku’s dick.
Pre-cum begins to drip down onto Izuku’s stomach, and Katsuki’s sharp gaze focuses onto the drop immediately. His eyes glow when he turns his gaze up to Izuku’s face, and Izuku shivers in anticipation as Katsuki turns to lick Izuku’s dick, never once breaking eye contact. Izuku jumps, immediately trying to press in closer to Katsuki’s mouth, desperate for his own satisfaction.
Katsuki smirks, reaching around to hold Izuku steady and grabbing hold of his dick. Izuku shakes, his dick desperate for friction of any kind, weeping more of its pre-cum. Izuku feels tears prick at the corners of his eyes, because he’s never gone this long with a hard-on without doing something about it and it’s killing him.
Katsuki’s at least merciful. His lips graze over the tip, tongue peeking out to lick at the head of his dick. Izuku cries out, wiggling in an attempt to push further into Katsuki’s mouth, but the hold the demon has on his waist keeps him in place. Katsuki’s tongue slips around the head of Izuku’s cock, lapping up the pre-cum that still weeps from him, before sliding down and flattening out to glide down the underside of the shaft. Izuku’s uncertain if he is even breathing, the sensation of his dick being sucked for the first time leaving him light-headed and trembling.
His voice is seemingly lost, wanting to say so much but unable to make a single coherent noise as Katsuki’s cheeks hollow out and his head begins to bob along Izuku’s dick. Izuku watches, mesmerized and burning from the inside out, and then Katsuki’s glowing red eyes lock on to Izuku. It happens all too soon, Izuku’s body unable to hold out as the pressure builds and he comes down Katsuki’s throat, gasping for air and moaning louder than he thought he would.
Despite not getting a warning, Katsuki doesn’t seem to mind. He swallows around Izuku’s shaft, deepthroating him entirely before he slowly begins to pull off. Izuku watches, panting through little gasps and moans the whole time, Katsuki’s tongue dancing along his sensitive skin and cleaning away any excess cum. Izuku’s body goes limp once Katsuki’s mouth pops off, and he licks at his lips as he stares at Izuku catching his breath.
“That,” Izuku manages, heaving a breath and shaking his head, “unbelievable…”
“I didn’t even do much,” Katsuki scoffs, though he sounds amused. He raises his brow, a smirk on his lips. “So… Kacchan?”
Izuku blinks, unfamiliar with the word. “Huh?”
Katsuki barks a laugh, pulling Izuku’s legs down as he reaches for the lube. “You called me Kacchan - were you that far gone?”
Izuku’s surprised he’s able to feel himself blush in embarrassment, his entire body warm and satisfied, but the familiar sensation of heat pooling in his cheeks still comes. “I… I’m so sorry…! I didn’t know I was saying anything!”
“Oh,” Katsuki chuckles, squirting the lube into his hand, “you said a lot.”
Izuku’s arms flail to cover his face, completely mortified. “Oh god, what did I say?!”
Katsuki hums, the lubricant squelching as he does… whatever he’s doing with it. “Nothing too terrible. I mean, I don’t particularly care - I am a demon after all.”
Izuku pouts, lowering his arms to look at Katsuki. “So you keep reminding me, but the horns are enough of a reminder…”
Katsuki smirks, focused on his own movements. Izuku puts his arms down completely and, to his surprise, Katsuki is jacking himself off.
Izuku flails again, this time just trying to bring his tired body up into a sitting position to try to stop him. “W-wait!”
Katsuki stops, looking at him in confusion. “What?”
“A-aren’t you going to fuck me?”
His eyes narrow. “Uh, yeah? I can’t do it fuckin’ raw, now can I?”
Izuku stares for a moment before looking down again. He wasn’t wrong, but Izuku usually just fingered himself with lube to prepare for when he used his toys. As he stares at Katsuki’s lubricated dick, he realizes why Katsuki isn’t fingering him.
“Your claws…”
“Haah?”
“You’re not prepping me because you have long, sharp nails,” Izuku mumbles, looking up to Katsuki’s face. “Right?”
Katsuki clicks his tongue. “Yeah, well, you fucked yourself a few hours ago so you don’t need to be prepped—”
“How did you—”
“And I don’t exactly wanna fuckin’ hurt you.”
Izuku laughs, surprising Katsuki. “So says the demon?”
Scowling, Katsuki focuses back on his own dick. “I’m a demon of contracts, not chaos or death…”
“I bet you’d be good at it,” Izuku chuckles, thinking back to the tree he casually set on fire earlier.
Katsuki smirks. “If you want me to kill someone, I’ll fuckin’ do it.”
“No!”
Huffing, Katsuki shakes his head. “You’re no fun - I hope you wanna kill someone one day, Deku…”
“I’m not useless!”
Katsuki grins. “You’re about to be…”
Izuku’s breath hitches, his pulse spiking again as he’s pushed back onto the bed, Katsuki following after him to catch his lips in a chaste kiss. Izuku blinks, confused at how sweet and gentle Katsuki’s being as he pulls back, looming over Izuku once more, elevating Izuku’s hips.
Katsuki begins to press the head of his dick against Izuku’s hole, the lubricant he’d covered his dick slipping just a bit. Izuku’s back arches, hopeful he can help with the angle, and soon he feels his hole begin the familiar stretch.
However, no matter how familiar it was to be stretched like this, Izuku could tell this was completely different. Katsuki’s cock was warm, full of life, and throbbing in ways a silicone imitation never could. Izuku’s body began to tremble again, as though this was his first time, Katsuki grunting over him, stopping with every squeeze Izuku’s muscles gave to his dick. It felt amazing, and Izuku needed more of it, shifting on the silk sheets to help Katsuki go deeper and deeper.
Katsuki kisses him again, grabbing Izuku around his shoulders and pulling him up. Izuku wraps his arms around Katsuki’s neck again, holding on tightly as their mouths slide together in a sloppy kiss, the shift in position burying the demonic cock deeper inside of him. Izuku moans, hips bobbing as he tries to fuck himself.
Holding Izuku tightly by his hips, Katsuki begins to lift Izuku himself, pulling him almost completely off his dick before immediately thrusting back in. Izuku breaks their kiss, head thrown back as he moans happily - yes, he thinks, fuck me harder!
Katsuki groans in return, moving Izuku once more to do a deep thrust again. Izuku screams again, pulling himself closer to press his forehead to Katsuki’s neck. He needs Katsuki to keep doing that, to keep fucking him hard, and deep, and to move faster.
He feels the world shift and the silk sheets at his back, but Izuku barely even gets a whimper of disappointment out when Katsuki begins to fuck into him exactly the way he needed.
Was he talking senselessly again? It doesn’t matter, especially not if Katsuki could continue to fuck him so perfectly like this. He whines, he moans, grunting, sobbing, begging - Izuku isn’t even sure he’s saying words, but Katsuki doesn’t seem to mind - their skin slaps together, hard and loud and wet. Izuku can feel his body tremble with the thrusts, and his mind goes foggy with the need for more.
Even without Katsuki’s hypnotic powers, Izuku can feel himself become loose, limp, and unraveling into a mindless sex puppet for Katsuki to have his way with. He loses sense of his body beyond the sensations happening deep within himself - distantly he thinks he might be crying, or drooling, or both, that perhaps he’s pissed himself or somehow cum again so soon after his first blowjob.
Either way, Izuku doesn’t mind. He’s happy to give his body over to the demon fucking him, is ready to die then and there if it meant Katsuki could have his way with Izuku for the rest of eternity.
Katsuki slows to a stop, pulling Izuku into a gentle embrace. “You still with me?”
“Nnnhhh,” Izuku moans, his body feeling like putty against Katsuki’s.
“What the fuck?” Katsuki shifts, moving to pull Izuku off of his cock when Izuku whimpers, clumsily reaching to stop him. “I didn’t even hypnotize you into being my little Deku, why are you—”
“S-soo goooood,” Izuku finally gets out, his tongue feeling heavy. He can see now that he most certainly did cum again, the puddle of cum on his abdomen slipping down to collect around his soft dick. He didn’t care though, he knew what he needed. “M-more...”
Katsuki grabs hold of Izuku’s chin, making him look up at Katsuki. “Looks like I don’t need to turn you into a useless little Deku with my powers - my cock does it for me, huh?”
Izuku tries to nod, but he isn’t sure he actually moves. “Ka… Kacch…”
Katsuki kisses his nose, snickering. “Yeah? You were calling me Kacchan again before your brain turned to mush, Deku.”
“S-sowwy…” Izuku felt exhausted, but his body still felt far too stimulated to pass out. He needs more, and if Katsuki could just keep fucking him already.
“No, don’t apologize,” Katsuki grins, “I can be your Kacchan, baby Deku - do you want me to finish?”
Izuku nods, leaning his head against Katsuki’s shoulder.
“Do you want me to cum inside you?” He nods. “Fill you up, nice and full?”
“J-jus’ fuck me, Kacchan.”
Katsuki laughs, shifting to lean back against the wall, pulling Izuku with him. “Alright, I’ll slow down for you - don’t want you to miss this.”
He kisses the top of Izuku’s head, and Izuku sighs as their bodies begin to rock, the cock inside of him slipping in and out a bit slower, but still hard enough to continue meeting that mind meltingly good sensation Izuku experienced before. Izuku closes his eyes, resting his cheek against Katsuki’s pec, and he rides out this slowed down fuck satisfied and happy.
Katsuki’s body tenses, his hold on Izuku tightening. Izuku rolls his head to look at Katsuki’s face properly, the heat of Katsuki’s becoming more intense as he begins to shallowly thrust into Izuku in quick, short movements. Izuku lets out short little gasps, his body seeming to wake back up and his dick quickly begins to harden from the overstimulation it was experiencing being trapped between their bodies.
Katsuki moans, deep and ragged, the sound shooting straight through Izuku and waking up all of his senses. Izuku whimpers, the throbbing of Katsuki’s cock pulling at his rim and Izuku hopes Katsuki will be ready for another round soon - he most certainly is, especially as a new sensation pools inside of him, Katsuki’s shuddering breaths and whispered “Deku” telling him exactly what it was.
Izuku tries to shift lower, to push Katsuki further inside of himself as he cums. Izuku sighs, unraveling at the feel of his body expanding as it continues to pool within him. He isn’t sure when it will stop, but he can already tell he’ll hate it when it slips out of him.
Katsuki’s body trembles, twitching a little as he finishes, tight and tense in his hold of Izuku’s body. He waits a moment, before slowly unraveling and settling back, relaxed and satisfied. Katsuki looks at Izuku, a lazy grin on his face. “Fuck, I haven’t come like that in a long time…”
Izuku smiles, kissing Katsuki’s chest. “I liked it - I feel… full…” Humming, Katsuki begins to shift in a way that tells Izuku he’s going to pull out when he stops him. “N-no, wait…! I… I’m not ready for it to be over…”
“Haah…?” Katsuki raises a brow. “Deku, you can’t just keep it in there.”
He sits up, driving Katsuki’s (somehow) still hard cock deep inside him again. His stomach bulges, just a little, and Izuku places his hand over it. “I want you to fuck me again.”
“Again?!”
Izuku grins, twisting his body to begin turning around, leaning back against Katsuki. “Come on, Kacchan - fill me up, nice and full…”
For a moment, he hesitates. Izuku doesn’t waver however, reaching up to caress Katsuki’s cheek. Katsuki smirks, hooking his hands under Izuku’s legs and spreading them wider.
“Gladly.”
