A Good Call; A Good Spell

Winner of the Term 7b Fic Poll! The winning theme was:  Demon Bakugo casting a spell on a sleeping Deku and fucking him until his stomach is stuffed with cum. Obviously, this one was a ton of fun! 

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It wasn’t often that humans caught his attention but this one…well, this one was a different story. 

Perched on a tree branch outside the kid’s window, draped in a spell of invisibility that hid him just enough that his outline would only be noticed if this adorable little morsel were to focus really hard, Katsuki watched as he went about getting ready for bed. It was a Saturday so this child, Izuku, had stayed up much longer than he usually did. Normally, that would’ve annoyed him since it meant he had longer to wait until the kid fell asleep but this time, he wasn’t too bothered. Izuku had stayed up far too late. He dragged his feet as he shuffled about his bedroom, clumsily undressing as he tiredly brushed his teeth. The poor bunny could barely keep his eyes open. Katsuki’s gaze followed him, hungrily devouring his slim body. By all the Demons in the Seven Circles of Hell, he’d never encountered a human so stupidly adorable. This kid…Izuku…could put all the succubuses in hell to shame. One glance of those big, green eyes could make even the most human hating demons weak in the knees. He knew quite a few of his kind who would gleefully show this kid the extent of demon debauchery but thankfully, he had been the first to discover him. Not the he would’ve minded fighting off his useless brethren to claim this gorgeous morsel as his own. 

Dragging his tongue along his lower lip, a shiver of excitement raced down Katsuki’s spine when Izuku finally switched the lights off and flopped into bed, sluggishly pulling the covers over him. Considering how tired the beautiful little bunny was, it wouldn’t take him long to fall asleep. Straightening up from his perch, Katsuki made himself wait a few more agonizing minutes than he thought necessary, just to make extra sure the kid was in dreamland. While he had more than enough spells to subdue Izuku in the expected panic he’d fly into at the discovery of a real bonafide demon in his bedroom, it was easier to put him under the particular spell he was thinking of when he was completely relaxed – i.e. fast asleep. He could still do it if Izuku was panicked but the effects wouldn’t be the same. He wanted his adorable bunny to thoroughly enjoy this, even if it was via the influence of magic. That would be the case for this first time around but it wouldn’t be too long until he didn’t have to use any magic. 

At near twenty minutes after the lights had flicked off in Izuku’s bedroom, Katsuki confidently took a step forward. His foot hit open air. Instead of plummeting to the ground below, he silently phased from the outside to the inside. Soft carpet pressed against the underside of his foot. Izuku’s scent – an incredibly sweet, addictive smell that made his heart race – slammed into him with enough force to leave him dizzy. He greedily sucked in a deep breath. Oh, this was a scent that could even drive the Great Horned Lord Lucifer wild – not that the powerful demon lord often indulged in the few rare delicacies found amongst the humans he enjoyed torturing so much. Just fine with him – meant that there was even less competition. Some demons just couldn’t appreciate how…alluring particular humans could be. 

When it came to this one, he was glad for that. A large grin slowly spread across his face as he walked over to the bed. Comfortably snuggled underneath the covers, Izuku was out like a light. Laid out flat on his back, he was the picture of a peaceful sleeper. His adorable face was relaxed and peaceful. His chest rose and fell with steady, even breaths. Katsuki placed a knee on the bed. He leaned over, swallowing against the thundering pulse in his throat. Finally…this adorable human was going to be his. Reaching up to brush the backs of his fingers against Izuku’s soft, round cheek, Katsuki drew his hand back a little when Izuku shifted in his sleep, dragging in a sharp breath. Only a select few humans could really sense demons and know what it was they were dealing with but every one of them got uncomfortable, cold when they were around. This sensation followed them even into their sleep. There were some strange humans who got a particular thrill from this feeling. Something told him Izuku wasn’t one of those. No…he was too good, too pure for that. If he were to see Katsuki in all his demon glory, he’d probably collapse into a fit of nauseous terror. 

Though, Izuku wouldn’t be experiencing that discomfort for very long. Pressing his thumb to the middle of Izuku’s forehead, Katsuki’s muttered a few words in the Old Tongue – a spell that would have a very special effect on his peacefully sleeping bunny. Stretching his patience had an immediate payoff. Usually, if a human wasn’t completely relaxed, this spell could take ten, sometimes even fifteen minutes to start working. Since Izuku was fast asleep, the effect was almost immediate. Within only a couple minutes, the pace of his breathing had rapidly picked up. Prominent droplets of sweat popped up on his smooth forehead. He began to squirm and writhe underneath the covers, moaning in his sleep. Grinning broadly, Katsuki pulled the blanket away, giving Izuku some relief from the terrible heat that was soaking his body. His gaze drifted down from his heaving chest to his crotch, where, he was more than pleased to find that the boy was sporting a noticeable erection. Underneath the thin fabric of his underwear, Katsuki could see his cock clearly twitching, desperate for some relief. 

Katsuki chuckled. He carefully climbed up onto the bed, making sure not to disturb his little bunny too much. The bed creaked loudly underneath his weight. Waking Izuku up too early could cause the spell to break. Despite its strength, the damn thing was delicate. Until it had completely taken control, there was a list of things as long as his horn that could break it. Combined with the fact that this damn spell took a stupidly long time to make and required ingredients that were none too easy to find, he’d much rather deal with the annoyance of having to be careful than indulge his impatience and risk all his careful planning falling apart. No, he wanted Izuku to look up at him with naked lust in his eyes; wanted him to plead in that adorable voice to be stuffed full of his cock, his seed…wanted him to fall completely, irreversibly, toxically in love with him until just a look could have him violently trembling with desperate needed. 

Slipping between Izuku’s legs, Katsuki gently parted them, smoothing his large palms over his trembling thighs, adoring the way the muscles twitched and jumped underneath his hands. Small…he was so small, so frail. In comparison to him, he was almost a doll. It felt like if he pushed just a little too hard, he could break him apart. Thankfully, this useful little spell took away a lot of the worry that he might hurt him. He might be a demon but that didn’t mean he wanted to harm his adorable little bunny. No, he wanted to break him with pleasure, with ecstasy until he possessed his entire being...until he belonged entirely to him, existed only to be his. Katsuki grinned widely at the thought, a bright burst of heat coursing straight down to his throbbing cock. 

He pushed his fingers underneath the hem, slowly pulling down Izuku’s now thoroughly soaked underwear – this time more for the thrill of the reveal, rather than feeling the need to be patient. Izuku’s cock popped out from the constraints of his underwear, standing straight up from an unruly mess of darkly colored pubic hair. Beautiful…it was even more beautiful than he could have possibly imagined. So small and plump! A perfect pink color with a divinely shaped head; a slim, delicate shaft, and two tantalizing orbs hanging from the base. Drool pooled underneath his tongue. His own cock throbbed almost painfully. Forcing himself to take deep breaths, Katsuki glanced up at Izuku’s face. 

The color in his face had deepened to a gorgeous scarlet. His eyes darted back and forth underneath closed lids. Thick eyelashes fluttered with the frantic movement. Each breath came out as a heavy gasp. Trembling hands clutched at the bedsheets as he writhed and squirmed, the soles of his feet dug into the mattress. It looked so painful but the spell still hadn’t taken complete hold of him just yet. Katsuki clicked his tongue in annoyance. Well, that was fine. He knew just the trick to move things along without risking breaking the spell. Placing his hands on Izuku’s thighs, Katsuki leaned down, sliding his long tongue out of his mouth to press it firmly against the base of his cock. Izuku gasped raggedly, his hips bucking. It had been his intention to just tease him a little – aggravating this desperate pleasure would only push him over the edge – but the moment the sweet taste of his precum, his skin, his penis flooded across his tastebuds, his self-control snapped. 

Exhaling sharply, he stretched his mouth open wide, taking Izuku’s cock between his lips. He clamped down tightly around him, pushing down to the base. Choking out a strangled cry, hips straining up off the bed, Izuku came immediately, filling his mouth with a heavy load of the sweetest, most delicious fluid he’d ever tasted. Moaning low in his chest, Katsuki lovingly sucked on his spasming length, milking out every last drop of that heavenly nectar. His bright red eyes, blazing with a barely restrained lust, focused intently on Izuku’s face as he came. The pleasure would be unbearable right about now, weaving through his consciousness, undoing his reason until, when he did finally open his eyes, there would be no fear, no panic – only a blissful relief and gleeful acceptance…no, desire for that was happening. It wouldn’t be long now. Just a little bit more – one more push. Katsuki shifted his appearance slightly, only to retract his fingernails to a length that wouldn’t hurt his precious bunny. He slipped a hand between his trembling thighs, reaching down to finally, finally, finally brush the tips of his fingers against what he desperately wanted. 

Izuku whimpered, squirming underneath him. A thick fluid seeped from his adorable little bunny’s hole, soaking him from his ass to his thighs. No need for any real preparation – the spell had already worked his magic. Despite the very noticeable difference in size between them, Izuku would be able to take his length with no problem. Swirling his fingertip around the puckered entrance a couple times, Katsuki’s gaze flickered up to closely watch Izuku’s face as he slipped a finger inside. It was only one but to Izuku, it would feel like he had an average human’s penis inside him. A violent shudder wracked his adorable bunny’s body. With a loud, ragged gasp, his eyes fluttered open. Katsuki grinned widely as a dazed, hazy gaze slowly slid down to finally look at him. They stared at each other for a few silent moments then a sweet, dizzy smile spread across Izuku’s flushed face. He reached down with one trembling hand to lightly brush the tips of his fingers along the curve of one of Katsuki’s horns. Lifting his head, Katsuki caught hold of his thin wrist, bringing his hand to his mouth so he could press a wet kiss to his palm. 

“Ka…Kats…uki…” Izuku breathed, a line of drool running down his jaw, “More…more…”

Katsuki shivered at finally being able to hear his name whispered in that gorgeous voice. While he could’ve used the standard aphrodisiac spell that all his pathetic brethren went with whenever they wanted to fuck a human without much fuss, there was one major snag he couldn’t get over. The common aphrodisiac spell did put humans in a dream-like state but during that, they saw the object of their affection as being the one with them – not the demon currently fucking their brains out. The thought of his adorable bunny seeing, experiencing anyone other than him…it was enough to make his blood boil. No…this child, this human was his. He wouldn’t share him with anyone, not even an illusion. His spell used no such trick. It was far more complicated, implanting not only a vague memory of him – something that Izuku would experience as a dream – but a desire for him that would start small and grow to become stronger, more intense the moment Izuku saw him. 

It was far from the simplest thing but the way Izuku was looking at him right now made it more than worth the trouble. 

“More what, my love?” Katsuki slipped off Izuku’s cock to rasp, pushing a second finger inside of Izuku’s tight hole. If it weren’t for the spell, Izuku might’ve been screeching in pain by then but he was so wet, so soft. He stretched easily, hungrily gobbling up everything he had to offer. His insides tightly clenched down around him, practically sucking his digits in even further. Izuku whimpered loudly, rolling his hips needily. 

“More-! Please…-! Can’t-! Can’t-! I-!”

“I won’t know what you want unless you tell me, Izuku.” Katsuki cooed, rapidly thrusting his fingers in and out. Throwing his head back, tongue hanging out of his mouth, Izuku squealed and wailed, bucking his hips in time with the movement of his fingers. Precum poured out of his twitching penis. Within a couple hard thrusts, Izuku was cumming again, howling lustily as he sprayed thick ropes of white all over his stomach and chest. One heavy thread splattered against his mouth, staining his plump, pink lips white. The corners of Katsuki’s lips turned up into a sly smirk. He had made a special modification to the spell…one that ramped up Izuku’s sensitivity dramatically. Right now, with just his fingers, the sensation of being stretched, rubbed, teased would be driving him crazy. Everywhere he touched would react like an erogenous zone. Pushing up, Katsuki dragged his long tongue through the mess on Izuku’s stomach, swallowing down his juice with effervescent hunger. 

“Cock-!” Izuku shrilled, drool streaming down his throat, “Cock-! Katsuki-! Pleash-! Pleash-! Your cock-! Want your cock-! Can’t-!” 

And there it was. What he had been waiting for – a direct invitation…no, a plead that Katsuki couldn’t even consider ignoring. He yanked his fingers out of Izuku’s spasming hole. Time to give him what he really wanted…for him to finally get what he desperately wanted. Grabbing Izuku by his hips, he yanked him up until he was level with his cock. Eyes widening, hearts practically dancing in his hazy eyes, Izuku gasped in feverish anticipation. There was no hesitation, no fear, even when his monstrously massive dick was right in front of him. There was only that naked, needy want. He spread his legs open a little wider in an obvious invitation, the pace of his breathing harsh and shallow. Grinning drunkenly, Katsuki pressed the tip of his dick to Izuku’s entrance. 

“You want this, don’t you…Izuku?” Katsuki breathed, playfully grinding against him. Cute…cute, cute, cute, cute!! This damn human was so fucking cute-! 

“Yes-!” Izuku gasped breathlessly, “Yes-! Yes-! Katsuki-! Please-! Please-! I want it-! I want your cock-!” 

“Good boy.” It felt his face was going to split from grinning so widely. This human…he was never going to let him go. Izuku was going to be his for the rest of eternity. Curling his hands tighter around his hips to hold him steady, Katsuki took a moment to let this vital turning point in both their lives sink in then, with a loud grunt, slammed his hips forward, driving his immense length inside of Izuku’s addictively tight hole. He wasn’t even all the way in yet before Izuku was cumming with a howling scream. Their bodies slammed together. Izuku’s stomach bulged out, deformed by his massive cock inside him. The inner walls of his insides clamped down tight around him, squeezing and sucking, stroking his cock with an intensity that made his head spin. Katsuki groaned and shuddered. He…he had fucked some of the most talented, desired succubuses in the Nine Circles but none…none of them compared to this! 

This…this was divinity-! This was heaven inside of a human body-! The tightness-! The heat-! The pressure-! He had found nirvana, and it was no gift from god but a carnal sin that made him rejoice his status as demon. Clenching his teeth tightly together, his tail flicking agitatedly behind him, Katsuki began to rapidly buck his hips, slamming into Izuku with enough force to send him jolting forwards. Loud, gorgeous squeals poured out of the boy. A dizzy, delirious smile stretched across his brightly flushed face. He frantically reached out to Katsuki with trembling hands, gasping and panting out his name. Bending over, Katsuki wrapped his arms around Izuku’s significantly smaller form, lifting him up off the bed. He plopped back onto his ass, dropping Izuku into his lap. This change in position pushed him even further down his cock. Howling in ecstasy, Izuku grabbed hold of his horns, holding tightly as Katsuki slammed up hard into him. Grinning slyly, harsh pants tumbling from his lips, Katsuki’s gaze flickered between Izuku’s gorgeous face, and his stomach, swelling and expanding every time he thrust in. 

“So beautiful.” Katsuki cooed, leaning down to brush their lips together in a sweet, gentle kiss that he quickly deepened into a hungry, almost desperate devouring of his adorable bunny’s mouth. Izuku moaned loudly, clumsily pushing up into him. Sweet…Izuku’s lips were so sweet. There was no doubt in his mind that every part of Izuku sung with sweetness but he couldn’t wait to taste every inch of him. “Does it feel good, Izuku?”

“Good-!” Izuku gasped raggedly, “Your cock-! Feels so good-! I can…I can feel you in my belly! So…so warm!”

“You like this, don’t you? Like being stuffed to the brim with me?”

“Yes-! Yes-! Katsuki-!”

Pushing down, Katsuki whispered into his ear, “You want me to cum inside you, right, Izuku?”

Shuddering violently in his hold, Izuku shakily nodded, “Inside-! Cum inside-! Please-! Katsuki-!”

His orgasm had been pushing hard against the back of his cock for a little while but at those words, he knew he couldn’t hold back any longer. Even though he liked having his adorable little one right where he could see his face, there was something he wanted to watch when he came inside. Grinning broadly, heat blazing in the base of his belly, Katsuki easily spun Izuku around so his back was pressed to his midsection. Slipping his arms underneath his adorable little bunny’s legs, he pulled them up and open as he rapidly ramped up the pace and strength of his thrusts. Squealing loudly, his head falling back, tongue lolling lewdly out of his mouth, Izuku bucked and rolled his hips. He clung to Katsuki’s horns for balance, giving him better leverage to move. The sensation was incredible. The insides of Izuku’s heavenly hole were squeezing him even more tightly, as though his body was desperate for his seed. 

Panting heavily, Katsuki leaned down to whisper into Izuku’s ear, “Here’s exactly what you want, my adorable Izuku.”

Slamming up hard to completely sheathe his length inside of Izuku’s hole, basking in how far his stomach extended out with him all the way in, Katsuki pushed down further, stretching his mouth open wide to sink his teeth into the delicate flesh of Izuku’s shoulder. An immense rush of scalding, vibrant ecstasy tore through him. He shuddered against Izuku’s back as a torrent of cum poured out of his cock, flooding into his spasming insides. Izuku shrieked at the top of his lungs, his eyes rolling back into his head. His small, plump penis twitched as he came once more, splattering the bedsheets with a mess of his juice. Shivering with rapturous delight, Katsuki watched, enticed, hypnotized, as more and more of his cum streamed into Izuku’s belly, causing it to swell bigger and bigger. He slid a hand down from his leg to gleefully smooth his palm over his extended, engorged stomach. A gurgle rattled out of Izuku’s throat, followed by a gush of Katsuki’s thick seed pouring out of his mouth. Nothing came out of Izuku’s cock but going off the way he was shuddering and shaking, squeezing him so powerfully, it felt like his insides were going to crush his dick, Katsuki knew he had cum again. Beautiful…he was so goddamn beautiful. 

Before he had even finishing cumming, Katsuki started moving again, slamming up into his adorable little bunny’s now thoroughly sloppy hole. Reduced to only a blubbering mess. Izuku bobbed in his hold, shrieking and wailing shamelessly. His plump penis swung between his legs. With every thrust, his swollen stomach bounced lewdly. A steady stream of cum poured out of his wide open, gaping mouth. Curling his fingers around Izuku’s jaw, Katsuki tilted his head back so he could look down into his beautiful face. A soft, satisfied smile tugged at the corner of his lips. This had to be one of the finest decision he’d ever made: claiming this human as his own. 

Trailing the pad of his thumb over Izuku’s cum drenched lips, Katsuki murmured, “You wanna me mine, don’t you, Izuku?”

“Yes…” Izuku gasped dizzily, “Wanna…wanna be yours…Katsuki…”

“You know what that means, don’t you, Izuku?” 

“What it…means…?”

“Yeah, to stay with me…you’ll have to become a demon. You want that, don’t you, Izuku?”

“I can stay with you-! If I become a…demon?”

“Mmhmm…become a demon and you can stay with me. Always with me. You’ll be my personal pet. You’ll exist for me alone…your sole purpose will be to love me, to please me, to stay with me. You want that, don’t you, Izuku?”

“Yeah…” Izuku whispered shakily, his insides squeezing him even more tightly. He sucked in a sharp breath, using what leverage he had to push down harder against him, “I wanna…I wanna stay…wanna be your pet…Katsuki-!”

A pleased smile spread across his flushed face. Turning Izuku’s head around, he pushed down to press a firm kiss to his lips, “Good boy. Say good-bye to your human life, Izuku. From now on, you exist solely for me.”

“Yes…” Izuku breathed happily, his dazed eyes sparkling. 

Katsuki nipped playfully at his lower lip then shoved Izuku down onto the bed, clamping a hand onto the back of his neck as he roughly slammed deep into him. Izuku squealed in delirious ecstasy, banging his butt back against him. Burning with an intense pleasure that he’d never experienced before, Katsuki nipped, sucked and kissed everywhere he could reach. Transforming Izuku into a demon would be so easy – he was already fully submitted to this decadence so pushing it a little further, removing that pesky humanity would be no trouble at all. Using that spell had been a good call, after all. It had done just the trick to make sure that Izuku became irreversibly his.