Cambrian’s Emporium of Everything (Multiple Settings)

The Pleasures of Womanhood (Demon Slayer)

A/N: The Pleasures of Womanhood was a commissioned one shot originally written back in February of 2021. Posting it up here and now for people to enjoy!

Summary: Muzan Kibutsuji, the first Demon, is also a shapeshifter. As a shapeshifter, her gender can be very fluid and far from set in stone. But when she decides to have some fun as a woman... she ends up having TOO MUCH fun when she encounters the wrong, or perhaps right sort of man. 

Themes: Genderbending, Mind Break, Breeding

-x-X-x-

"Hey babe, you-urk!"

As with every other man who has had the audacity to approach her this eve, the demoness does not wait for him to finish his cheesy pickup line. Lashing out, she grabs hold of his crotch right there on the spot and fondles it a bit to see if he's at all worth her time. One of her eyebrows raises as Muzan Kibutsuji feels out the shape of a rather large, and still growing bulge.

"Well, well… what do we have here?"

Contrary to many of his peers, the mortal man foolhardy enough to approach her solely because of her gorgeous looks proves to have even less survival instinct when he reacts with smugness rather than fear.

"Feel something you like, sweetheart?"

He's a brute, this overconfident man in front of her. Large and well-muscled… but still so very human. And in Muzan's experience, human is synonymous with weak. The demoness is the first of her kind, and progenitor to many, many more. Not in the way most humans would think. In fact, much of the time, Muzan wasn't even a woman. She was a he, and he was the more well-known entity in most Supernatural circles.

But as a demon, or demoness, Muzan Kibutsuji was an accomplished shapeshifter. And as a shapeshifter, such concepts as gender were so very easy to slip in and out of. Right now, she was female through and through in both mind and body. And she was on the hunt for someone… exciting.

It seemed that she'd found him, judging from this human man's size and all around disposition. Smirking, Muzan finally releases his crotch and steps away from the bar she'd been standing at, heading towards the stairs. He doesn't even wait for an invitation… he hurries after her, dogging her heels even as she ascends the stairs and leads him to a bedroom.

As soon as they're both inside, he closes the door behind himself and then grabs her by the arm and whips her around. She's a little surprised by the audacity, even knowing already how foolhardy this human apparently is. As surprised as she is, he manages to lay a kiss on her, one that she half-melts into for a moment as his tongue surges into her mouth and his lips smash against her lips.

He's a commanding kisser, and Muzan's currently feminine sensibilities find that appealing. Traditionally, it IS the man who leads, isn't it? She wonders what else he might have for her. Still, it wouldn't do for him to get TOO full of himself, so when he withdraws his tongue for a moment, she bites down on his lip hard enough to draw a bit of his blood, causing him to involuntarily rear back and curse.

Smirking at him with her teeth stained red, Muzan cocks her head to the side.

"You're getting ahead of yourself, human. Do you even know what I am?"

Once again, she's a bit surprised when he doesn't even hesitate.

"Demon. Yeah, I know. Just like I know your kind are the randy sort, aren't you? Normal human women… they can't keep up with me. Wanna see if you can?"

As far as pickup lines go, it's probably the best she's heard all night, and Muzan isn't just saying that because he's acting so fearless, or because she already brought him up to her room. Intrigued, the demoness doesn't resist when he goes in for another kiss, nor does she stop him from pushing her back towards the bed. She's much stronger than him physically, or at least she should be, but… part of her just wants to give in. Another part of her wants to see where this will go.

As such, her kimono is soon disheveled, her tits half-falling out of her top as he pushes her onto her back at the foot of the bed and lifts one of her long, shapely legs up into the air, letting it rest over one of his broad shoulders. As he exposes her dripping wet pussy to his gaze, Muzan realizes for the first time just how aroused she already is, how flustered and off-balance he's already made her.

When he releases his cock from its confines and slaps the full length of his impressively massive throbbing member down onto her crotch, Muzan jolts, the demoness recognizing for the first time just how big he truly is. Feeling him up through his pants at half-mast was one thing… this is the real deal.

The human doesn't say a word as he slides his cock backwards until the head of his thick bulbous member is pressed up against her twat. Muzan's breath hitches and she finds the silence oppressive, his gaze burrowing into her own like he's somehow peering into the soul the demoness isn't entirely sure she even HAS.

As he thrusts into her, a moaning mewl emits from her lips and she claws at the bedding beneath her. He's far bigger than her male form's phallus, but to be fair, she was a shapeshifter. She could make her male form's cock as big as she, or rather he, wanted. It just wasn't practical, since even her male body was rather lithe and even feminine in a way.

Of course, her current form is ALL woman. Her tits bounce out of her top with the force of his first few thrusts and continue to bounce and jiggle as he holds her by the leg he has over his shoulder with one hand, and by her disheveled kimono with the other. Moaning, panting up a storm, Muzan finds herself feeling rather peculiar about the sound of her own voice sounding so sweet and needy…

Feeling a need to take back some level of control, having not even realized she was losing it in the first place, the demoness look up into the well-hung human's unfathomable eyes and speaks around her moans and whimpers, even as her face reddens further and contorts in surprised pleasure.

"M-Maybe… i-if you can entertain me, I-I'll gift you with a, nngh, f-few drops of my blood, human…"

Lifting a single brow at her, he quirks the side of his mouth up in a half-smirk.

"That so?"

Feeling like she's being condescended to, Muzan gnashes her sharp teeth and growls at him… only for the human to respond by flipping her over right then and there. Before she can react, several things happen in rapid succession. One, he yanks her kimono backwards off of her body, yanking her limp arms behind her in the process. Two, he pushes her further up the bed with his full weight, climbing onto the bed finally and joining her there.

And three, his hands fall upon her shapely derriere and he positively SLAMS his cock back into her gushing cunt from behind, stretching her out and filling her to the brim in this newest position. As he bottoms out inside of her, slamming up against the entrance to her womb itself, Muzan lets out a particularly undignified shriek and falls forward, face down on the bed as her back arches and her ass lifts higher in the air from his thrusts.

"Entertained you, demon?"

His tone is almost jovial as he begins to fuck her harder and faster by the moment, plowing into her from behind like… like she's nothing more than a common whore. Like she's his bitch, made to be fucked and used by him.

Obviously, that's not the case. She knows that's not the case. But his cock, it feels too good. Why hadn't she ever done this before? How had she lived for so long without experiencing the pleasure of a woman in this way? It wasn't like it was Muzan's first time being fucked in her female form. The demoness had taken male lovers in the past.

But they'd all been terrified when she revealed her inhuman nature to them. In the end, each and every sexual experience she'd ever had, she'd been in control, with them deathly afraid of upsetting her.

Not this human though. He was so full of confidence, so full of vigor and raw strength. She could understand why no human woman could handle him. She herself could barely handle it as he fucked her from behind, pounding into her with every last inch of his cock, ramming up against her cervix in a way no man before him could claim to.

"Fuck you're so fucking tight! I'm getting close, you sexy demon bitch! Gonna cum! Take it! Take it all!"

Going to cum? Inside? She'd never let a man cum inside of her before. Humans and demons were notoriously compatible, it was almost guaranteed. But right now, despite ostensibly being stronger than this man… she feels as weak as a mewling kitten. And in the end, that's what she's reduced to, mewling as he proceeds to fill her with his seed despite her protests.

"W-Wait… s-stop…"

Whether he hears her or not, Muzan does not know. He cums regardless, letting out a loud groan as her eyes threaten to roll back in her head. The sensation of being seeded by this man, of being filled with his spunk against her will, however nonresistant she currently is… it's amazing. She tips right over the edge without even realizing it, orgasming explosively and milking the latter half of his load as he fills and fills her womb with his cum.

It's finally over… but she's not sure she can go back to the way things were before. Not after all.

Except, even as she thinks it's over, the human still buried inside of her disabuses her of that notion by beginning to start up again. As he begins to fuck her already creampied pussy, drawing an ugly pleasured cry from Muzan's lips, he leans over her and hugs her from above.

"Hope you didn't think we were done, babe. I'm just getting started."

-x-X-x-

Hours later, she kneels on the floor at the foot of the bed while he sits there, drinking some water and just watching her. In turn, Muzan finds herself with her knees spread and her hands palm down on the ground between them as she kisses and licks and laps at his magnificent cock, worshipping it with her tongue and mouth.

Every time he presents it to her anew, it's like she can no longer think straight. Kissing up and down his shaft, descending to his sweaty ball sack every once in a while to pay that the homage it deserves as well, Muzan moans as she trembles beneath him. He's not even fully hard right now, and his thick cock is still laid out atop her head, making even more of a mess of her already messy hair.

She knows exactly how long she's been here with him in this room, and every time she thinks about it, it surprises her. He hasn't let her rest, not even once. His stamina… it's inhuman in it's own way, but her enhanced senses, her sense of smell, what she sees with her eyes… all of it tells her that he's human. He's one hundred percent human… but he's undeniably the cream of the crop.

He's exactly the sort of person she would turn into a demon. However, instead of her turning him into a demon, he's turning her into a wanton slut for his big, fat cock.

Reaching down with his free hand, he lifts his cock up for a moment and then slaps it back down, moving it from atop her head to her draped across her upturned face. As her eyes are completely covered by his thick slab of man meat, Muzan lets out a lewd moan, her pillowy lips parted and her tongue lolling out in earnest delight.

He absolutely loves just… resting his cock on her like this. Reminding her of its warmth. Invading and pervading her senses with it's lewd scent and violent throbbing. Even now, as she kneels there before him trembling and covered in sweat, she can tell… i-it's getting bigger again.

"Ready for another round, demon bitch?"

It's a testament to how far she's fallen in a single night that Muzan doesn't kill him on the spot for that insult. Instead, she moans like a wanton whore as he grabs hold of her hair and drags her back up onto the bed. And when he lays her out on her back and proceeds to push her legs up towards her head before covering her body with his in a mating press, well, there's nothing she can do but accept it.

His cock slides right back home into her already messy twat. She's completely lost track of just how many times she's cum inside of her at this point, if she's being honest. Half a dozen at least… perhaps even a full dozen at most? It's all starting to blend together, but not in a way that makes it any easier to withstand the pleasurable barrage of sensations his massive cock barreling down the length of her love tunnel constantly assaults and overwhelms her with.

As his cock pounds into her and his balls slap against her thighs, both of them well-lubricated by her saliva and drool from when she was worshipping him with her mouth and tongue, the man kisses her again, leaning forward and grabbing hold of her hair as he slams his mouth into her own once more. At this point, Muzan doesn't even think about biting his lip or tongue. Her own mouth instinctively opens to his tongue as she submits to his domineering assault on her senses wholeheartedly.

Her eyes half-rolled up in her head, the demoness can barely contain herself. When he's not kissing her, she still might beg him to slow down, beg him not to cum inside. But even to her ears, her words are quiet and toothless, and it's incredibly obvious she's paying lip service to the idea of reluctance at this point.

With her legs pushed up to her chest and her feet in the air on either side of his body, her toes curl with pleasure as Muzan cums again and again around his pistoning, thrusting cock. He truly is insatiable, his libido endless. She doesn't want to like it at all, truly she doesn't… but it just feels so damn good.

Pulling his mouth off of hers for a moment, he grins down at her.

"Like my cock, sweetheart? Am I entertaining enough for you?"

"B-Bastard… w-why do you have to be s-so BIG?!"

Letting out a laugh at that, he lowers his mouth to her tits instead, slathering all over her breasts as she tosses her head back and groans in ecstasy. This wasn't what she intended for tonight. But what she intended wouldn't have been half as good, she's forced to admit. Another limp fucker too scared of her to give her what she really needed.

But when had this become what she really needed? How had she never known that being treated like a woman, like a whore, was what she really wanted deep down inside? As he slams into her cunt yet again and proceeds to fill her with ANOTHER load of his white hot cum, the knowledge that he's almost certainly knocked up her incredibly fertile demon pussy at this point sends Muzan over the edge into the greatest, most powerful orgasm of her entire life… in any form.

Her eyes finally roll back in her head for real, her tongue lolling out of her mouth as she squeals and shrieks in ecstasy, her entire body spasming and seizing up beneath him as her cunt squeezes down harder than ever before around his cock. In response, he lets out a hoarse grunt and holds her in place until she's done cumming her brains out around his dick.

When it's finally over, it's like something has broken within her. She really isn't sure she can go back to the way things were after this… and as he starts to thrust away yet AGAIN, apparently STILL not satisfied, she realizes she may not be allowed to. He's got her dead to rights, and she's not sure she can live without his cock in her life… not after this.

Gurgling brokenly, Muzan lets herself be washed away in the pleasure of the moment and stops thinking about the future or the past. All that matters is the here and now… getting properly fucked on this man's big fat cock.

-x-X-x-

Months later, he walks into the kitchen while she's doing some cleaning and strides right up to her, delivering a hefty slap to her fat ass.

SMACK!

"A-Ah~"

"Hey babe. How's your day been."

Turning her face away from him, Muzan bites her lower lip rather than look him in the eye. With a burgeoning pregnant belly, the situation is apparent to any who see it. She's been… domesticated of all things, taken by this man and ultimately turned into his plaything over the course of but a single night that has then turned into a multiple month relationship based around his prowess with his cock and the fact that he's knocked her up, that he's bred her.

"S-Shut up… you know I-I haven't left the house…"

Grinning, he nods his head.

"Yeah, too afraid of missing me whenever I came home, weren't you? Well, I'm here now."

When he applies a hand to her shoulder, the pregnant demoness doesn't resist as she sinks to her knees before him. She scowls up at him though… right up until his cock is laid out across her face, and then it's impossible to scowl, impossible to glare, her face turning red and contorting into that of a wanton slut in seconds as her tongue lolls out to begin worshipping his cock and balls.

In all fairness, Muzan is a demoness. She's been alive for centuries. So, this is really nothing more than a detour in the grand scheme of things. Sure, she's had to put all of her long-term plans on hold for this detour, but it's just that… nothing more than a detour. Unless… unless she makes him a demon like her. Unless she makes him immortal.

He has yet to ask for it. She both dreads and dearly anticipates the moment he will. Because she's not sure she can deny him anything anymore. It's like… it's like she's his now, his woman, his pregnant demon bitch.

And the worst thing is… she doesn't exactly hate it. Not one bit.

-x-X-x-

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