[Latex, Corruption, Encasement]

"H-Haaaaah... T-That's another bad Spirit put in its place..."

"You sound like you're having a lot of fun, Erina. Hope you're not too tired, because we've got sooooo much more work still left to do."

"J-Joy. J-Just give me a moment, hhaaaahhh..."

It was another night in Bakehara, a city teeming with little Spirits hiding around every corner. These Spirits weren't always on good terms with the humans they lived alongside, prompting them to cause all sorts of trouble. And the ones that were actually kind were instead being hunted down by the Demons that also hid within the city, causing a three pronged conflict that was only intensified by the humans that dared to try and get involved.

Including the young girl that was currently doing her best to balance against a wall. Her name was Erina Solstice. Normally, she was basically a nobody. A brown-haired girl with thick glasses that hid away her golden eyes, and the only thing that made her stand out amongst her peers being her oversized shirt and her taste for metallic black shades to her other accessories. Right now however, she was anything but ordinary. The shiny purple dress that covered her body as it was complimented by the black accents and elegant violet colors represented by her leggings and her gloves joining together with her short black cape and her wizard-like pointed hat that reached far into the sky made it hard to not pay attention to her. Even if you couldn't pick out her identity thanks to her black-and-violet domino mask.

Her identity at the moment was the Mage of Shadows. A Mage was essentially the combination of a Human and a Spirit. By putting their powers together, they could not only subdue any kind of malicious Spirits that were causing problems for Spirits and Humans alike, but also fight against any Demons that might arise. To be a Mage meant to be on the side of Spirits, regardless of who was trying to take advantage of them. What mattered was the total safety of their kin, and nothing else. Which was totally fine by Erina, Spirits didn't make fun of her tastes.

The Spirit that had allowed her to become the Mage of Shadows was one that did not exactly have a name. In fact, it was barely even a Spirit when they first met. But despite the fact that it was shying away from the world and hiding the best it could, Erina showed it compassion and kindness. Which was how it ended up bonding with her shadow. Becoming one with her on a level that was unprecidented, even before they unionized and became the Mage of Shadows.

"P-Phew. That last one was... A-aha... I didn't know they could use attacks like that..." Erina muttered a bit as she adjusted her hat. All while a bunch of slime was sticking to her dress. She had barely been able to avoid being eaten alive by a slimy Spirit, causing her to end up stickier than she would've ever liked to be. And that turned her on...

Her living shadow just laughed a bit as it popped out of the wall she leaned against, the shadow that had her face smiling ever slightly. "Well, at least we can cross that off your list. Been a while since we've been able to check it off, hasn't it?" The shadow giggled, all while its host blushed and pouted a bit in response...

"D-Don't talk about that list! Somebody might hear!" Erina cried out, speaking in a louder tone than her shadow... Which she quickly realized as she started sliding down the wall as embarrassment filled her body more and more. "A-ah. W-well, it's not like anybody'll care about what a Mage is into, especially since nobody'll find out who they are in reality..."

The shadow laughed at her host's quick mood swings, before wrapping its thin arms around her body and squeezing softly. "They'd find out, because you're the biggest pervert in the whole city, Erina. Or would that be me, since I've been soaking it all up? Hmmm, that's something we'll have to figure out sometime. I'm sure I can dig out a couple cute pictures from your collection that you've forgotten all about."

Erina buried her face in her hands. Well, this was mostly her own fault. Letting that Spirit be part of her life by becoming her shadow meant that it had started to learn all about her interests. And while that included a whole bunch of anime, it also included a lot more erotic material than somebody might consume on a regular basis. Whcih meant that it grew up to be a pervert just like her, and unlike her it had no sense of restraint or grace to keep it from saying things that would embarrass her.

"Ahahaha, you're so cute when you're like this, Erina!" The shadow laughed, its hug tightening a bit before it finally let go and just patted her on both the back and the head. "But you have to get used to it. Otherwise, you won't be able to stand up and fight against all the Spirits that'll try to get the best of you using what they know. You have to make it part of you without making it a weakness."

"E-Easy enough for you to say, you're a shadow, you don't feel the same kind of shame that I do." Erina trembled a bit as she pulled her head out of her hands, looking straight at the shadowed outline of her own face. "Isn't there a way to make it easier..?" She muttered, since she really didn't want to just try and overcome her own worries the hard way. Because that meant she'd definitely end up an irrepairable pervert who would be thinking about all sorts of extremely lewd things at every waking hour of the day. And while that would be some sort of fun, it would still fill her with shame until she was ready to deal with it...

Her shadow just kept laughing as it reached closer and pecked her on the cheek. "Well, I have a couple ideas. But let's start with the obvious one." It said, before grabbing ahold of its hosts head and carefully planting its lips straight on hers. Letting their plump pillows intertwine for but a few seconds...

As they were made to kiss in such a crude manner, a shock ran through Erina. And with a scream echoing from her heart, a small trail of liquid started to pour down onto the ground below from the confines of her crotch. She had just been struck by a shock of pure pleasure, getting rid of all her pent up arousal that would've kept her in all sorts of trouble. After all, she was still horny thanks to all the sticky stuff that had been covering her. And to make things a little sweeter, the sheer strength of that climax she had just been forced to endure was also enough to shake all the slime off.

Erina trembled and panted and gasped as she tried to understand what just happened. How was her shadow able to do something like that? And what were those flashes that poured through her mind? Were they... Were they images of her in all sorts of horny situations? N-No, that... W-Well, that could be right. She did always want to try and experience all of her kinks. It was why she had that list that they were checking off. She just didn't expect her shadow to be so obsessed with them. That was something that caught her off guard, and the thought of the shadow helping her with reaching those situations just caused a little more of her juices to squirt on out of her...

"Y-You... H-How did you do that?" She had to ask her shadow, all while she slowly but surely started to get back on her feet. It wasn't easy because of the orgasm still rushing through her body and leaving her in a state of weary afterglow, but she definitely tried. As long as she had the wall to rest against, then she could stand up for at least a little while. All while her mind processed how good that rush of intense fantasies had been for her...

The shadow chuckled and patted its host on her head. "You should know how, I'm part of you." It said, all while stretching a bit. "But now you should be ready to deal with any other Spirits we'll fight tonight. Unless you'd like another bit of help." She chuckled a bit more, all while a subtle gold shine started to form near the outline of the shadow's eyes...

Erina shook her head and smiled. "I'm good. Just help me in the normal way. And thanks for that, I really did need it..." She sighed as her heart started calming down and beating softly against her chest. She was in a state of complete and utter calm. Nothing was going to cause her problems from now on. As long as she didn't get too excited, then she could fight against anything. Let the shadow swallow them whole and get rid of the bad stuff, so the conflicts between the Humans, the Spirits and the Demons wouldn't last!

For a brief moment as she started walking forward, a thought passed through her head. Hold on. She had watched enough anime to know that if you kept indulging too much, you'd end up falling. And since she had been feeding her shadow the bad vibes from the Spirits as well as the extra bad vibes that all the Demons had, wouldn't that cause it to slowly and surely turn bad? If that was the case, shouldn't she remain on guard so she could make sure she wouldn't be betrayed..?

No, that couldn't be right. Sure, those cliches existed for a reason, but that didn't mean that it was going to actually happen to somebody she had kept this close. Besides, if her shadow had really started to turn bad, then she would've turned bad too. If anything, they had both been getting hungrier... Hopefully they weren't starting to grow fat just because they indulged a bit much.

As Erina's thoughts strayed back and forth and she ignored the obvious dangers of feeing her shadow all sorts of bad junk, she hardly noticed that the very same shadow was currently busy wrapping right around her little by little. Squeezing around her legs and covering them in a nice layer of shiny black latex that made them stand out so much more than she already did.

It wasn't just her legs either. Thanks to the girl's absentminded train of thought that had taken her mind hostage, she didn't notice the black latex squeezing onto her outfit and compressing it more and more, all while a small skirt took the place of the much bigger outfit, just because she needed something to preserve the modesty of her hole down below, even if it was currently being compressed and squeezed into a form that wasn't easy to use.

Even as it stretched further and further up, even as it carefully wrapped around her bosom and pushed her nipples inward until yo ucouldn't see them on the outside of the latex, she didn't notice a thing. Mostly because she was kinda spent on arousal and horny thoughts thanks to what the shadow had done to her just moments prior, leaving her numb to most of what was happening.

Of course the shadow wasn't ultimately doing anything harmful to her. Covering her in this much latex was all for her protection. That was why it was tight and hard to move in. She didn't need to worry about moving around when she was wrapped around her, because the shadow would do all the hard work. She would keep her protected just like when they were fighting as a mage. There were just going to be some new stipulations in their little contract...

But eventually, Erina would have to notice. And that was right as the shadow started to creep up the back of her neck, causing her to feel a few shivers of worry running down her spine. "Mmm? What's going on..?" She muttered, her mind finally snapping back from how distracted she had been, only to notice the thick layer of black latex that was currently covering her body. "H-Hey, wait a moment, what happened!? Why is everything so tight!? Hey! HEY!" She shouted, panic completely consuming her as she thrashed around with a vague hope that she was just imagining things. This wouldn't be the first time that her mind went completely out of control and had her vividly imagining something that wasn't real.

Unfortunately for Erina, it was completely and utterly real. Especially once her shadow snapped around her face and trapped her within a thick layer of darkness. Causing her to be barely able to breathe, at least until she felt something forcing apart her lips and sink deep into her throat. It was like one long tentacle that was making it harder and harder to think the further it went into her. It wasn't just her throat either, every other hole was being penetrated, causing her to tremble all over.

"There there. Just relax, just relax. It won't hurt if you don't struggle." Her shadow spoke, all while gentle caresses started to pour through its form and caress the girl underneath. "Just breathe carefully, Erina. I won't hurt you as long as you play along. Not that I expect you to fight back against this. You never were the type to fight back against stuff like this, especially when I started trying it in your dreams."

Erina's cheeks blushed. Of course her shadow understood what she had been dreaming of. Which would explain all the scenarios that had been flashing before her eyes. They were of her in her dreams. The many ways that she imagined that she could be bullied and subdued. The many ways that she could be made a victim of her own kinks. Her shadow understood and recognized all of them as something that she wanted. But this? Was this really one of them? ...Okay it definitely was but she just didn't think much about it since it wasn't high on her list of priorities.

Her shadow giggled as it felt the thoughts inside its hosts mind. Such cute thoughts. Those thoughts were why it was doing all of this. "So, you wanted all of this to be easier, didn't you? It can be easy. All you need to do is get over your shame, while you're stuck inside me, and I'll make sure that we keep things as they should be." It chimed, giggling more and more as the shadow adjusted itself to make sure it was properly aligned on its host's face.

There wasn't really much that Erina could do to argue against that. She really did need to get a proper grip on her kinks and her interests, so she wouldn't end up debilitated like she had been earlier. If she kept on getting weighed down by her horny thoughts, if she kept on being consumed by her need to be dominated, then she would never be useful in an important fight. This was a way to train her so she could make up for her weaknesses. Even if that training meant overindulging in something that already left her completely useless. Wait, did that mean she would end up better or worse..?

She didn't get to chance to think about it too much before her eyes started to shine and her mind started making her favorite scenarios real. Getting pinned beneath one of her enemies and forced to worship their rear, getting stuck in between a set of breasts that kept on pressuring her and making her feel like she couldn't fight back, getting trapped within another enemy's outfit and pressed against their body while she was pressured by their outfit too...

The scenarios were playing through her mind faster and faster, Erina muffledly moaning more and more as the various parts of her shadow penetrated her deeper and deeper. It all felt so good. She was being driven wild with her own arousal, to the point where she just wanted to explode in one big final climax. And... And..!

She didn't get that. The moment she felt she was close to a climax, she was left high and dry. She was forced to stay this close to the edge of her arousal, a knife-tip away from being pushed into her orgasm. Nothing she could do would let her get over it. Because even her thoughts were working against her. Her shadow stopped her from thinking about anything lewd as it had wrapped around her brain, putting her arousal on hold until she started calming down...

And as soon as she calmed down, she trembled and started to muffledly moan again as it started the process all over again. This was the true nature of her training. To learn to endure her own fantasies. Because if she could avoid getting riled up by her fantasies, if she could endure all of it and avoid getting close to the edge... Then she'd be rewarded with one final orgasm, that would prove that she could fight even in the toughest conditions inflicted by her own mind.

Of course she wouldn't be stationary during it. Her shadow would be in control. And that shadow had plenty of plans for what she wanted to do now that she had a proper body, as the domino mask that had been covering her host's face popped out on hers as well, spreading further as it added the only sense of color to the completely black girl through the shade of violent on one of the mask's halves.

As her golden eyes glowed through the mask, her new role was in sight. Not a Mage, nor a Spirit. But a Demon of Shadows that would do whatever she wanted, ignoring anybody else as long as she could have fun.

And once Erina had completed her training... Then it was time to introduce her to how fun it'd be to be a Demon and share her tempered love with everyone else... Ehehe...