Corrupted Through and Through (Skinsuit TF, Slimegirl TF)

A Magical Girl taking a break from hero work has gone shopping, and finds themselves accosted by a monster. One that seems quite eager to slurp out their soul and fill it in with something else...

Commission for Dakra featuring our characters in a discord TRPG we're playing. 

-----

It had been entirely too long since Mai had had the opportunity to go clothes shopping. It wasn’t that she was a shopaholic or even particularly fashion conscious. She wasn’t any more clothes-obsessed than the next young woman with disposable income. But still, it was the sort of mundane thing that she didn’t get to do too much now that she was a Magical Girl - too busy training, fighting demons, or occasionally indulging in the pleasures of youth with her teammates.

Besides which, she had rather more disposable income than usual; a magical-girl-idol deal had gone surprisingly well, and she had made some real bank off the concerts and merchandise, even if the latter was rather exaggerated at times. So she could afford to pick out nice clothes instead of whatever was in the bargain bin that a college student could normally afford! Maybe a couple of outfits; a nice dress or two, some more casual hoodies and pants, and some underwear. She needed to replace her clothes anyway; demons had a tendency to be lustful and whenever she got caught out of magical girl form, clothing damage ensued.

She hummed cheerfully to herself as she browsed the racks in an upscale clothing store that she’d never have taken a second look at before. The fiscally conscious side of her considered whether it was really worth the extra money… but she deserved to treat herself, didn’t she?

While Mai was preoccupied with the clothes, she didn’t notice that she was being watched. Another young woman had entered the shop, coming from a staff entrance and looking for all the world like an employee if you didn’t pay her too much attention. She looked around for a bit, licking her lips, searching for something - before locking her gaze on Mai. She scratched a bit at her cheek, and grinned, before approaching the magical girl with a smile plastered on her face.

“Hello there, and welcome Aphrodite’s Envy! My name is Sabrina, and I’m going to be your helper today! Do you need help finding anything?”

Mai nearly leapt out of her skin with how surprised she was; if she’d been in magical girl form she’d have certainly hit the ceiling. “O-Oh, no, that’s fine, thank you… I’m Mai. But yeah, I’m good, thanks for asking… just looking around.”

“Then I’ll patiently await my opportunity to help you.” Sabrina said cheerfully. “I take it this is your first time here? If you’re having trouble deciding, I can assist you.”

Mai looked the woman over. She seemed nice enough, a perky young brunette working a summer job if she had to guess. “I… sure, do you have some suggestions?”

She did as it turned out. The woman was chatty and eager, and Mai found herself being dragged along with her as she was brought from section to section to look at different dresses. After each one they went to the changing room, and Sabrina helped her change.

Sabrina was… very physical, and Mai found herself blushing more and more as the process went on. Ever since becoming a magical girl she’d been rather more in-tune with the more… primal, of human urges, and that was showing as a cute girl touched her here and there while helping her into and out of clothes. She started to wonder what Sabrina would look like naked. She wondered how she’d taste down below. She wondered many, many things.

The employee looked back at Mai with a sly grin, taking note of her predicament - her flushed face, how she tried not to let her legs open too much as she walked, that clouded look in her eye. It was almost too easy. “Now, why don’t we make a selection?”

Mai took the opportunity to escape. “Oh, I really like this one…” she said, pointing to the nearest outfit she’d put away - it was a touch more risque than most, a blouse with ample cleavage, a dangerously short skirt, combined with a lacy black lingerie set. Mai flushed bright red as she realized what she’d just pointed at, but she’d already made the call.

Sabrina smiled as if nothing was odd. “Of course! Come with me into the back, and we’ll take your measurements, so our tailors can make whatever adjustments they need.”

That sounded good. Mai nodded. She snatched up the clothes and followed Sabrina towards the back room. She tried desperately not to think of how aroused she was - really, had she fallen so far she couldn’t talk to a pretty girl without wanting to jump their bones? She shook her head at herself.

It seemed to be effectively another changing room, but this one with a bunch of tape measures. “Now, take off your clothes.” Sabrina said cheerfully, not apparently noticing Mai’s discomfort.

“I… could you look away…?”

“Oh, don’t be silly. We’re both girls, aren’t we?” Sabrina said serenely.

Mai nodded. She’d make it quick. And maybe a part of her really liked the idea of Sabrina seeing her naked, like a lot. She quickly shrugged off her top, followed by her skirt, leaving her in lingerie. Her nipples were visibly poking through the bra, and her panties were damp. “I-I’m sorry…” she muttered.

Sabrina didn’t seem to mind. “Keep going.” she prompted.

Mai nodded, and did so - she unhooked her bra, and then peeled her slick panties off of her womanhood. She was nude now, and more than a little horny. “M-Make it quick!” She said.

But there didn’t seem to be a tape measure forthcoming. Mai saw in the mirror Sabrina approaching - close, very close, and then grabbing her from behind. Mai gasped, but it turned into a moan as a hand closed around her breast and began to knead it. The other trailed down her stomach, then her thigh. “I can see you want to have some fun~” Sabrina breathed in her ear, “Why don’t we take care of you before you soil your pretty new clothes?”

“Mmmmhn~ Wha…” Mai groaned, but by now, she wasn’t really in a position to refuse. Her body was moving on it’s own, pressing against Sabrina’s. Mai was no longer thinking with her brain nearly as much as her clit.

As Sabrina groped and grabbed Mai’s sensitive breasts, her other hand was trailing a line across Mai’s thigh, up towards her pussy. “Don’t worry, Mai. Don’t worry about anything. You just need to stand there and look pretty.” Sabrina whispered, and Mai found herself complying.

Mai clapped a hand over her own mouth to stifle the loud moan of pleasure as Sabrina’s fingers started to explore. Her hips involuntarily bucked against Sabrina’s hand, but as overstimulated as Mai felt, she wouldn’t cum for some reason.

Sabrina spun Mai around. Were the employee’s eyes oddly pink? Mai didn’t dwell on it too much, as she wasn’t in a state to do all that much thinking. Sabrina pressed herself against Mai, breast to breast, and drew her into a kiss.

At first, it was a normal kiss. Then Sabrina added her tongue, dancing with Mai’s. It was a sexy makeout session then, but then it kept going. Sabrina’s tongue went down, and down… it wasn’t a human tongue. Mai might have noticed if she wasn’t rather occupied just then. But Sabrina had her just as she wanted, and she wouldn’t let her change that. The tongue went down and down, down into Mai’s very soul.

It grabbed… something. Sabrina laughed softly into Mai’s mouth, and the Magical Girl stopped worrying about it. She would just keep kissing. The tongue started to withdraw, and when Sabrina broke the kiss she had a softly glowing golden something wrapped in her tongue. Mai looked at it with confusion as she started to sag against the bench.

The woman smiled as she took the cube from her tongue, twirling it in her fingers and examining it. “Ah… nothing like a Magical Girl’s essence to whet the appetite. This is mine, now. I’m sure you don’t mind.” Sabrina said, before popping it into her mouth.

Mai wasn’t sure what had happened. But it felt good. It felt really really good, and she found herself finally orgasming as she watched Sabrina swallow her essence, her humanity. She couldn’t move, paralyzed by whatever had happened to her.

She found herself sagging against the wall, felt her body flattening out and almost deflating. She felt as if she were hollow, empty. Both in the metaphorical sense, and also in the literal sense - she was reasonably confident there was no longer anything inside of her. Her expression was frozen in a mask of lust, unable to move a muscle now that she no longer had any. Her body lay splayed out where it fell, unable to so much as twitch. Not that she felt uncomfortable or anything - she didn’t feel much of anything physical.

As Mai finally stopped moving, Sabrina decided she could safely end the charade. She reached around the back of her neck and gave something a tug. Then she brought her hands to her head and gave herself a push.

Sabrina’s face seemed to almost fall off, sagging like a mask. The rest of her followed suit, crumpling to the ground and laying there motionless. The figure that had just left her gave the mound a soft kick to get it off her feet, and then stretched.

The figure was mostly humanoid and feminine, and it had horns and a tail. That was about as much as Mai could make out. The rest was black. Not black like a dark skin tone - black like the utter absence of anything, not showing any connection to her surroundings at all. If Mai’s nerdy friend Shinobu was present, she might have suggested the demon looked like she was a game character with all the textures missing but for her glowing pink eyes.

“Aaaah, that’s better!” The demon said, stretching. “A weak human like that is no fun to control. Her essence was hardly even an appetizer really. But a Magical Girl…”

Mai got a front row seat as the demon picked her up. Mai realized she didn’t just feel empty - she was empty, simply a suit vaguely shaped like Mai rather than a human being. “Hmmm… it’ll be a tight fit, but I think I can make it work.”

The demon turned Mai around, letting her face the mirror as she rooted around on Mai’s back. She felt something strange and heard a soft zzzzip! noise as the demon found something and pulled. “There we go!”

Mai watched in the mirror as the demon… stepped inside of her? Suddenly, her leg was full again, looking just like it was supposed to as the demon pushed herself inside. Then her other leg, and her hips were full. It felt… amazing, really. She’d never realized how good it could feel to just not be empty, to have something inside of her when there had been nothing.

The demon continued to suit up, pulling Mai’s chest up to match hers. Mai would have moaned if she had lungs, it felt so good! The demon had been right, she didn’t quite fit correctly in Mai; her breasts stretched Mai’s chest to the limit, making her seem bustier and curvier than usual.

The final part to put on was the face. The demon pulled Mai’s face over her own. Mai had a moment of disorientation, her mind blanking as suddenly the demon was in control of her vision. In the mirror, Mai couldn’t see the demon at all anymore - it was just herself, striking a sexy pose.

“Yeah… that’s good…” the demon said, reaching around back. Mai felt a strange feeling and another zip noise, as the demon pulled her tight and made sure she was secure. After that, the demon bundled the skinsuit she’d been wearing before under the bench, and put on the clothes Mai had meant to purchase. “Looking good, if I do say so myself~” she said, posing again in the mirror.

The demon-Mai waltzed out of the changing room and the shop. Her corrosive influence had already begun to taint Mai, and every step taken pushed Mai deeper and deeper into darkness.

-----

“So, who are these contacts… ‘Odette’... ‘Irowa’... ‘Shinobu’...” Mai pondered, flipping through her phone’s contact list. Or rather, the demon wearing her pondered. The demon was outside of the dorm that she could feel was where Mai was staying lately.

“Magical girls!” The real Mai said cheerfully. She kinda wondered if she should be so forthcoming, but the demon gave her a grope on the breast as a reward for her help and she stopped worrying about it. “We’re a team, they all live here too.”

“Good, good.” The demon said, smiling broadly. More magical girls to take for herself. She was going to have such a good time! And, she noted, Mai would help.

Mai felt that thought, and would have shuddered with pleasure. Yes, she’d help. Of course she’d help her owner. She couldn’t even conceive of not helping her owner - she was, after all, her property. All her self respect and dignity as a Magical Girl had been cast aside, consumed the same way the demon had consumed her humanity. She belonged to her now, mind, body, and tattered remains of her soul!

The demon walked into the dorms, taking a peek inside. “Now, which one do you think would be most vulnerable…” she pondered.

“Irowa or Shinobu! Irowa gets horny easily, and Shinobu’s usually doing nerdy things alone.” Mai said. The demon loved how casually she betrayed her friends now - she was really settling into her new life.

Luckily, the choice was made easy. The demon entered the dorm, and only one person was there. “Oh, hi, Mai! Had fun shopping?” Shinobu said, looking up from her laptop. She was sitting and typing away, even as she spoke. “I was just working on some plans for that Call of Cthulu game I mentioned running! Don’t look or you might spoil yourself!”

“That one’s Shinobu.” Mai supplied helpfully.

“Shinobu~” The demon trilled, plopping herself down on the couch next to her. “I’m looking forward to it~ It’s cool how hard you work for this stuff. I’m sure it’ll be a blast!”

Mai supplied the demon with Mai-sounding dialogue. She was already making the demon look like her, so why not help her sound like her as well?

If the magical girl noticed anything odd, she didn’t show it. “Thanks!” Shinobu said cheerfully.

“Anyway, yes, I did have fun shopping, thanks for asking,” “Mai” said, sliding herself a bit closer to Shinobu.

Shinobu didn’t pay much attention - Mai was always a bit affectionate, even sisterly, so it didn’t seem odd to her that she’d get so near. She was only surprised when the girl started rubbing her shoulders. “Wha-”

“You’re kinda tense, aren’t you? Why don’t you relax? Let me help…” The demon said. She gently took away the computer, before continuing to massage Shinobu’s back.

“I-I’m fine… oh…” Shinobu tried to complain, but it felt really nice… why shouldn’t she relax a bit?

“This is a bit of a bad position for it, though.” The demon said. “Why don’t we take this somewhere more… private?”

“Mai” was whispering in Shinobu’s ear now, pressing up against her. Were her breasts always that big? Her voice always so sensual? Shinobu felt a heat building inside her that she couldn’t ignore. She rubbed her legs together urgently. She had to focus, didn’t she…?

Oh, but what was the harm? The demon’s suggestion seemed so nice. She nodded. “O-Ok…” she said with a luminescent blush.

The demon laughed softly, before taking her by the hand and guiding her to a room - Mai’s bedroom, the suit supplied helpfully. The suit didn’t think of itself as Mai anymore - whoever wore it was clearly Mai.

The demon guided Shinobu to the bed, and had her sit down. She straddled her, rubbing herself against the magical girl sensually and drawing out several moans as her fingers brushed Shinobu’s rapidly dampening womanhood. “There’s a good girl~ Let your big sis take care of you~” she said softly, leaning in to kiss her.

Shinobu’s mind was in disarray. She normally wouldn’t do something like this, at least not out of the blue like that, but Mai was… very convincing. She was a very pretty girl in any case, but when she started using it actively, it was a potent weapon against any woman’s mind - especially Magical Girls, who always were a bit more in touch with their more primitive urges and thoughts. Shinobu had been dealing with a persistent low-level arousal since their last battles, and Mai was presently in the business of making that a very high level - she reciprocated the kiss.

And then felt something plunge into her mouth. “Mmmph!?” she gasped, muffled, as she tried to push “Mai” off of her. But the demon had her, and wrapped it’s tongue around something inside of her. This time, though, she didn’t take it out to consume - she had a better idea. She let her tongue stay there, exploring and staining Shinobu’s soul.

Shinobu tried to push back, tried to make herself transform, but it was getting hard. It was so hard to think, hard to worry. Wouldn’t it be better to just relax? She tried to push against that feeling, but it was a lot.

“Mai” pulled back, smiling broadly as she licked her long tongue against her lips. Shinobu was still human - for the moment. “That was fun… and I have another fun idea~” she said. She left Shinobu paralyzed on the bed, as she stood.

Shinobu watched in morbid fascination as the one she thought was Mai pulled off her own face. It sagged as it seemed to become a mere mask, revealing the demon underneath. Shinobu would have fought her, tried to attack, but she found it so hard to move… the demon stripped completely out of her Mai suit, but didn’t discard it like she had her first disguise. Instead she brought it to Shinobu.

“This little number was a cutie, a lot like you~ She’s so much fun to wear after I broke her, why don’t you give her a try?” The demon suggested. Although of course, she wasn’t “suggesting” anything.

“Mmhg…” Shinobu grunted, unable to bring herself to fight. What had the demon done in that kiss to leave her like this? Whatever the case, the demon approached, laid out the suit on the bed, and started to help Shinobu into it.

It was an odd sensation - as her legs entered the suit, she felt the suit’s legs as her own. The same when her bottom was pulled in, and her chest. Wherever she wore it, it became less like a costume and more like her body. The demon pulled an unresisting Shinobu into the suit step by step, until she was placing Mai’s face over Shinobu’s. There was a soft sucking noise as the mask slid into place, and Shinobu was looking out of Mai’s eyes.

The fit wasn’t perfect. Where the demon had stretched Mai to the limit, Shinobu didn’t fill her quite right - her breasts sagged a bit as some room was left over, and her thighs seemed to sag like

“Oooh, a new wearer already!” A voice said in her head.

“Mai?” Shinobu said. “Is that you?”

“Of course not,” the voice said. “You’re Mai. Whoever wears me is Mai.” The voice said.

“That’s ridiculous… I’m Shinobu!”

The demon cackled as she saw the internal struggle, before deciding to help it along. The suit was already thoroughly corrupt, and was progressing the work that the demon had begun. But she was so cute, the demon couldn’t help but join in. She straddled the magical girl once again. She started to grope her and finger her through her suit, ramping up her pleasure and corruption in equal measure. “What’s ridiculous is that you think that~” the demon laughed. “You’re not Mai, but you’re certainly not Shinobu either~”

Shinobu moaned loudly as the demon pleasured her, as her soul was under siege. Not Shinobu? What was the demon talking about-

“Don’t you love wearing your friend? She’s such a comfortable suit, such a good feeling suit.” The demon whispered. “You’re made to wear people. You’re not your own person, right? If you were your own person, you wouldn’t feel like this when I pleasured Mai~”

Not only was Shinobu being fingered and groped - but it felt better than it ever had on her own body. As if feeling it through Mai amplified the feeling a dozen fold. Shinobu felt her sense of self cracking, her soul blackening, as the demon worked her over and Mai sang in her head about how she loved to be worn. She was a good friend, and Mai wanted to be worn, so she would wear her, right?

She tried to push the demon off, but it was too much. A black, jello like substance leaked out of the suit’s mouth as Shinobu struggled. Inside the suit, something was happening - Shinobu was becoming less solid, less defined. She began to fill the suit a bit better. Not because of her thighs thickening, her breasts expanding, or anything like that. She was filling it better because her body spread to do so. Shinobu’s body lost it’s solidity, as it started to melt into a black sludge.

Shinobu was not, in fact, Shinobu, she realized. If she was, she’d have a shape of her own. But she didn’t have one, did she? She just filled out whatever space she was in. Right now she was filling up a suit of a girl called Mai. As her form dissolved, and her identity with it, she decided that meant that right now she was Mai. If she filled another suit later she would be that suit.

And oh, wasn’t it a lovely thought? She practically came just from imagining it, imagining how it would be to kiss someone and go inside them, turn them into a suit from the inside out…

This time when the demon withdrew, Mai grinned back at her. “Feeling better~?” she teased.

“Of course, Mistress!” Mai said, “Thank you so much for the suit~ Being Mai will be so much fun!”

To test how much control she had, the demon pulled the mask off of Mai. The slime within was revealed, a black mass of sludge filling up every nook and cranny of the suit. It definitely wasn’t Shinobu - even her face just held the image of Mai’s face, although currently pouting. “What was that for, Mistress? Do you want the suit back?” the nameless slime grumbled.

“No, I just wanted to see your cute little face~” The demon giggled, returning the mask to it’s place. The slime filled it again, and became Mai again. The suit welcomed her back eagerly.

The two stood up - the black, featureless demon, and the being that was now for all intents and purposes Mai. “What do we do next, Mistress?”

Oh, but that was delightful - she’d consumed two magical girls today. One she’d taken directly, and the other she’d had the delight of corrupting her soul to it’s core. The demon was satisfied with the day’s work - but there were still more girls to take. “Hmm… would you know where Odette is, Mai?”

The slime currently named Mai nodded. “Oooh, yeah I do! I think she was meeting a friend, she mentioned where. It’ll be fun to be Odette too for a while!”

“Then let’s go, shall we?”

The two walked out of the dorm - the demon didn’t much care that she lacked a disguise, it would be a simple matter to create another from the first human they passed. Today was already an excellent day - but it could be better. How many people could they take before the magical girls tried to stop them? Two, three, five, ten? Oh, but the demon and her minion were so excited to find out!