Hello! I would like to request a Cybi please!
What are some things you look for in an ideal partner?
>A possessive, obsessive, intelligent and, delusional yandere type
Do you want the CyBi to be aware of anything beforehand?
>Just some basic info, calm! gender neutral reader.
Do you have a person in mind who you want your CyBi to be based on?
>Can you do Muzan?
What customizable erotic features do you want your CyBi to have?
>Corruption kink, breeding kink, somnaphilia, and belly bulge. For monster features, maybe he can have some sharp teeth?
Do you wish to request more than one CyBi?
>No
Do you have any special requests?
>No
Seen Worse
possessive! obsessive! delusional! yandere! robot! muzan x calm! genderneutral reader
notes: so sorry this took such a long time for me to write out, i’ve never written for muzan before so hopefully this does his justice, enjoy!
what’s a cybi?
warnings: full-blown smut, no fluff anywhere, just reader gettin’ fucked, noncon somnophilia, belly bulge, breeding, demon muzan, corruption?, unprotected sex, afab reader, genderneutral pronouns, pussy/cunt, overstimulation, unbeta’d, nsfw below the cut.
It had been a total of three months since you’d received Muzan Kibutsuji in the mail, and perhaps, it’s been a wild ride, living with the demon king or a variation of him, at least. There’s been a lot of trials and tribulations that have come with living with him but you knew what you were signing up for upon ordering him— well, minus the unexpected virus that had recently gone widespread amongst the CyBi that have made them prone to… yandere tendencies.
Though, lately, you’ve been dealing with an inexplainable situation that has left you baffled yet you were not all that worried. For the last few days you’ve been waking up a little sorer than usual, only to find bite marks on your body in places that are… intimate. But last night, you experienced something truly unexpected and you were still having trouble distinguishing whether or not it was a dream or not, because honestly, you’ve seen worse.
The Night Before…
“Goodnight, Muzan, make sure to turn the TV off when you’ve finished watching your movies.”
“Of course, Y/N. Sleep well.” He hummed, giving you one of his innocent closed mouthed smiles where his eyes are just turned up the slightest bit, emulating joy.
You bid him goodnight once again and slid into the comfort of your bedroom, soon splaying yourself out onto your bed and doing whatever it took to finally slither off into a dreamless but restful sleep.
About an hour after you’ve fallen asleep, your bedroom door, already left ajar, opens even further, revealing the eager demon as he delves himself into the privacy of your bedroom without a care in the world. Slowly, he approaches the side of the bed that you’re closest to and silently watches as you sleep, listening to the soothing sounds of your breathing. The kind of noise that he could fall asleep to, however, tonight was his time to strike, he was finally going to take the last step, but it wouldn’t be the last time he’d do this.
Without much thought or care if you woke up or not, the demon king crawled onto your bed, hovering his massive body over your vulnerable and sleeping form, ruby irises sweeping over you as he drinks you in like a tall glass of wine. He’d been preparing your body for a few days now, though he had yet to cross the finish line, however, he believes he’s prepared you enough.
“If you did not desire this, my sweet beloved Y/N, you are more than welcome to reject my advances.” He hums to your sleeping form, watching as you only shift slightly in your sleep, no sign of waking up anytime soon.
He only pauses for a few moments, just to pull your shirt up above your chest and fondle your sides, trailing his claws up and down your skin, digging deep enough to leave light welts of risen skin that would go away with time. Those very same claws then began to slide downwards until they’ve hooked themselves under the waistband of your bottoms and within seconds your lower half is exposed to his lustful and hungry eyes as he waits yet again, watching as your face merely scrunches up but you make no effort to wake up and catch him in the act or stop him.
That must mean you wanted this, you’ve been waiting for this, and who was he to deny you of what you’ve been craving?
Yearning hands grabbed at your thighs, suddenly pushing them apart as they exposed you further, cunt glistening in the moonlight, just waiting to be bred by him and him alone. Somewhere between the living room and your bedroom, he’d already stripped himself bare, his heavy cock bobbing and jolting with every slight movement of his body. Who could blame him? Somehow, he’d manage to rile himself up with just the mere thought of burying himself inside you the moment he gets the chance to. In this moment, he looks more demon than man— er, robot.
He wastes no time, one hand holding down one of your thighs while his claws dig into your flesh, the other wrapping itself around his wide shaft as he starts to nudge at your entrance. Muzan licks at his lips as he starts to massage your little bundle of nerves with the head of his cock in slow yet pressured circles, eliciting a few soft noises of unconscious pleasure from your lips.
Your thigh twitches under his hand, only urging him to go a little faster with his movements.
Naturally, your body reacts, a fresh layer of slick coating itself over your lower lips as he swipes his cock around your clit like he’s drawing out an endless circle around it. But as soon as your cunts dripping with dew, he’s sliding himself up and down the middle of your pretty folds, coating himself in your essence and groaning lowly while doing so, his own pre-arousal dribbling from his tip and combining with yours. The natural sheen of your mixed arousals on his cock is enough to send him into a frenzy but he knows better than to just dive right in, no, he is going to bask in the growing wetness between your thighs, speedily sliding his tip up and down your entrance until /he’s/ had enough.
With his constant stimulation, you are unable to contain your light moans and the slight twist of your body as he overstimulates your nerves with just the head. Subconsciously, you buck your hips towards him, which he takes as a sign that you’re ready for him. And once again, who is he to deny what you’ve been craving?
Pulling away, he coos at you, voice dripping in honey and everything saccharine, “My sweet, are you truly this desperate for me? Have no frets, I’ll feed you plenty.~”
With a surprisingly tender touch, he elevates your legs, resting them onto the front of his body until they’re nearly hooked over his shoulders and wraps his hand around his cock, pressing yet again at your entrance. Only this time he no longer swipes it over, he begins to push it into you, easing himself into your sopping wet walls, sighing with the upmost of satisfaction as he fills you with the fat shaft of his throbbing cock, praying and hoping that you can feel every vein, and every throb as he bottoms out, watching in awe as he inserts himself as deeply as possible. In a shocking realization, as he’s kissed your cervix, threatening to bully himself into you even further, he takes note of the bulge in your lower belly, causing him to reach down and press onto it out of pure curiosity.
A sound of discomfort on your end soon graces his ears and he looks up from what he’s been staring at, only to watch you scrunch up your face again and shift around on his cock, no-doubt trying to wrap your sleepy little head around what was inside you and what was filling you up so perfectly. He’s quick to console you.
“Shhh shhh, relax, my sweet, I’m not going to move just yet. I know that you want me to, but I can’t ruin you just yet.” He purrs sweetly, grabbing a hold of your knee to give it a squeeze as your legs remain rested on his chest, he then turns his head and presses a tender kiss onto the side of your calf, continuing to relish in the divine warmth that’s got him chained down and unmoving.
This does not last too much longer, however, but he knows what he’s doing.
Slowly, he pulls his hips back, watching as the bulge disappears and only reappears again when he snaps his hips back like elastic, grinning sinisterly as your body recoils, a tired yelp escaping your mouth as you start to regain consciousness.
His beginning thrusts are deep and deliberate, making sure to strike your cervix each and every time he moves, his hands moving on their own as he grips one of your ankles and presses the other against the lower part of your stomach, his big hand spread out as his thumb presses against your clit, forcing stimulation onto it with every plunge of his hips.
It does not take much for your eyes to finally begin to flutter awake and adjust to the darkness in your bedroom, the only light source coming from the moonlight that shines through the curtains of your bedroom. But what truly wakes you is the sudden sting in your calf, almost as if something’s bitten you. Nothing could prepare you for the sight that was before you.
Observing you through a half-lidded gaze and dark messy tendril-like locks curtaining over his face, accompanied by the sound of slightly labored breathing, is Muzan, leaving yet another bite mark on your leg, forcing you to wake up and face a sudden reality that leaves you stunned.
That too does not last long when he pulls away from your leg, finally catching sight that you were awake, a lovesick grin spreads across the usually relaxed and calculated demon king’s face.
“I knew you weren’t really sleeping… You were waiting for this, weren’t you?” Muzan asks, getting off on the thought of you pretending to be asleep the entire time he was ravishing your unsuspecting body which only results in him delivering an especially harsh thrust, making you gasp out for air and grab at the sheets, words incapable of leave your gaping mouth as you lay powerless beneath him.
Unable to stop himself, he pulls out until just the head’s in you and slams back in, beginning to piston his hips, hand still pressing harshly down onto the bulge in your belly and your clit forced to brush against the rough skin of his thumb.
Beneath him, you writhe around, attempting to pull away from his animalistic thrusts, unable to deal with the constant stretch and repeated abuse of your poor cervix but he doesn’t let up, instead, he lets your legs fall from his shoulders and around his waist, his hands finding yours as he interlocks your fingers, pinning them down onto the bed besides either sides of your head.
“Let me hear those carnal noises, my sweet. You cannot run away from me.” Muzan mutters, watching for every little reaction you give him as your pleads for him to slow down or just stop all together fall on deaf ears. All he can hear are your sweet gasps for air and mewls of pleasure, the continuous ‘plap’ of his lower half colliding with yours, and the disgustingly loud squelch of your sticky cunt getting bred into by the immoral robot above you.
It’s not much longer before he rips a searing hot wave of an orgasm from your body with the buck of his hips and the touch of his fingers, hips driving deeper and deeper into you at an inhumane pace. But this is just merely the beginning.
Without warning, you’ve been forced into yet another position, flipped right onto your stomach and impaled yet again. This time, Muzan wishes to fulfill his goal. Breeding you back into unconsciousness.