Sveta Stassov's lead a pretty hard life up to this moment.

Being stuck in Terminus City, the concrete asshole of the world, was rough enough. Dead parents? Also pretty rough. Her mother dying from a freak monster attack, an attack that crippled her sister? Pretty woeful. Her father dying in a freak home invasion after spending long days in a thankless office job, slaving away for some greedy corporation? Just the worst.

So, Sveta's no stranger to hardship. Trials and tribulations are familiar to her. She's struggled all her life as a regular girl and as a Magical Girl.

But Sveta's worst, most arduous trial, is currently laid out before her right now...

"Goddamn it sis, put some clothes on already!"

The greatest of Sveta's labors is in the form of her little sister, Kisha Stassov and her new, sexy body.

Kisha looks up from where she's lounging on her belly, reclining on the new sofa Kisha bought with the money she's earning from her new job. Sveta's little sister blinks up innocently at her sister with her big, blue eyes, even as she continues sucking on the popsicle in her mouth.

"Don't want to. It's too hot. The air-conditioning unit's on the fritz again," Kisha shrugs.

"Bullshit, I know you had that fixed yesterday!" Sveta snaps back.

"… It broke again."

Sveta scowls down at Kisha, trying to avoid looking at the cute cat-ears that adorn Kisha's head. Or the fluffy white cat tail that sways invitingly behind Kisha's plump, scantily-clad rear. Because of course Kisha's decided to go around in nothing but her underwear again.

For the fifteenth time that day, Sveta curses Alice Takanashi, CEO of Kintsugi Biotech, from the bottom of her heart. Alice Takanashi's committed the most terrible of sins. She's utterly corrupted Sveta's innocent sister! Utterly defiled her nubile body! She's changed Kisha's hair color, gave Sveta's innocent sister cat-ears!

Cat ears of all the things!

"Anyways, sis, I don't know why you're reacting like this. It's just skin," Kisha goes back to reading off her phone and slurping on that damn popsicle in her mouth. Sveta twitches as Kisha's tongue licks at the long, cold, tasty treat. Slurp, slurp.

Sveta feels her eyelid twitch. Sure, it's skin. But it's not skin Sveta ever thought about in that kind of context before… Before…

Before that fucking pervert made Kisha all sexy!

"Is this the part where you get mad at my boss for-"

"I can't believe you let that… That fucking corporate pervert do this to you!" Sveta rants, feeling a hot flush cross her cheeks. It's not just rage that's causing Sveta's face to turn red. The petite Magical Girl feels an involuntary shudder wrack her body as Kisha shifts her thighs, causing her butt to wiggle. This causes Kisha's panties to ride up the crack of her ass, exposing the plump pale globes of her buttocks...

Sveta quickly averts her eyes, fixating on the far wall and away from her innocent sister's rear. Her delectable rear that looks like it'd be so fun to squeeze-

No! Bad thoughts! Bad. Bad!

Grr! Sveta grits her teeth, letting out a vicious growl as she tries to suppress her new, confusing feelings with the limitless RAGE she's feeling towards Alice Takanashi...

"Sis, you really need to stop getting so mad at my boss. I already told you, the body mods were my choice. Like these cute new ears. They're cute!" Out of her peripheral vision, Sveta sees Kisha turn over, her breasts shifting beneath her lacy bra. Sveta averts her gaze again so she can avoid seeing Kisha pout so endearingly.

She fails, she catches sight of Kisha's reflection in their apartment's window. Kisha's pouts remain as devastating as they were before her transformation into a gorgeous, white-haired catgirl. They're probably more devastating now. The way Kisha's new cat-ears fold over dejectedly, the way she curls in on herself now…

Ugh. Just the sight of Kisha's unhappiness sends stabbing, shooting pains through Sveta's heart…

"Don't you think I'm cute, sis…?" Kisha pleads in a wheedling tone. Her big, innocent blue eyes water. Her lower lip trembles. She sits up now, clasping her hands to her chest…

Ugh. UGH!

All the defensive barriers Sveta's erected in her mind crumble at the onslaught. Truly, the task of having to endure how disgustingly cute and sexy her sister's become is too much of a herculean labor to overcome.

"… Yeah. You're cute," Sveta groans. The admission physically pains her.

"I wanted to look like how you do in your Magical Girl form!" Kisha implores. "So we can look like sisters even when you've got your own cat-ears-"

"Shut up about my cat-ears, I don't like my cat-ears," Sveta grumbles.

"I like your cat-ears though. I like them a lot. You should let them out more!"

And now the two sisters are back to this argument. Well, to be fair, Sveta's been coming around to the idea a bit more recently. It would be nice to match with Kisha. It's certainly nice to pet Kisha's head now, to stroke her tail. Maybe… It wouldn't be so bad to let Kisha do the same to Sveta?

… No, what even are these thoughts? Sveta shakes her head furiously, blowing out a low breath, groping for a quick way to distract her little sister and herself…

"No, I'm not doing this now. You've got physical therapy. Come on. Doctor's orders, right?"

"Ugh, fine," Kisha sighs dramatically, shifting on the couch so she's sitting upright now, her legs dangling off the edge of her seat. "We can talk about this later."

Sveta lets out a wordless grumble, a light blush still on her face as she reaches down to massage her sister's legs. Legs that her beloved sister can move now.

For all Sveta grumbles and grouses about how much of a pervert Alice Takanashi has to be, she can't deny that the woman did give Kisha the ability to move her legs, to feel with her legs again. That Alice's healed Kisha, made her happy in a way Sveta couldn't manage. Hasn't been able to manage, could've never managed.

… And for that, a part of Sveta's begrudgingly grateful towards Alice. As cantankerous and ill-tempered as the Magical Girl is on a regular basis, even she can admit that she's thankful for this one priceless thing. Just seeing Kisha so happy and healed is enough to make Sveta happy.

Kisha lets out light moans as Sveta feels her skinny legs up, massaging the withered muscles, forcibly moving Kisha's limbs into various poses. This is a familiar process, physiotherapy's something Sveta's grown accustomed to. Stretching Kisha's legs, strengthening the muscle and bone to prevent her limbs from withering further when Kisha was still wheelchair-bound? It's an old, familiar process for Sveta.

What's new is the way Kisha's reacting. Sveta feels her blush intensify as Kisha lets out more moans, noises that take on a decidedly lewd quality. The cantankerous Magical Girl tries to tune out her sister's moaning, the way her sister smells now that she's gotten that new shampoo and conditioner, the feeling of her sister's supple skin beneath her fingertips…

"Hyan~!" Kisha mewls as Sveta massages her calves. "Feels so good sis…"

Goddamn Alice Takanashi. This has to be her fault. There's no way Sveta's cute, innocent sister should be acting so… Should be looking so… So…

Curse these stupid, sexy thoughts Sveta's torturing herself with now. No good sister should be feeling this way about her little sister. Goddamn these stupid hormones Sveta's been cursed with. Is this part of being a Magical Girl? Is this the reason why there's always all of these rumors about Magical Girls?

Sveta takes a deep calming breath, even as she continues to unconsciously fondle her sister's calves, and attempts to steady herself. Sveta's better than this. Sveta's not like the scum she takes down in the streets, the sicko perverts who'll get off on anything. Sveta's a cool, collected, professional-

"Nya~!"

Goddammit. Sveta curses in her mind, even as she plasters a smile on her face. This is hell. Having to endure all of these… These… These raunchy thoughts is hell. Where did these thoughts even come from? Why are they tormenting Sveta so?

This has to be Alice's fault. Kisha's new pervert of a boss. The scantily-clad woman who accused Sveta of trying to control Kisha. Yes, it has to be that wicked woman's fault. All of this. Except Alice also healed Kisha's spinal condition. An incurable condition that every single doctor refused to even look at because it was so untreatable.

And… She can't be all that bad if she did that? Nobody who's truly wicked would do that, right?

Grr…

"There, done!" Sveta snarls as she lets go of Kisha's legs, hastily withdrawing her hands. She moves so fast it's almost like she's been burned. "You want to try walking this week? Didn't your supervisor say you could?"

"Hmm… Nah, I want to wait until I've really built some more muscle up. You can feel it though, right? Sis, I'll really be able to walk again!" Kisha implores earnestly. Sveta swallows, feeling a hard lump rise in her throat at the sight of her sister's enthusiasm, her sheer excitement.

Kisha hasn't looked this happy in a long, long time. Sveta's beloved little sister has always had an air of sadness to her, mostly because she was forced to spend all day cooped up in this small apartment. Constantly being taken care of, stuck in a wheelchair, unable to truly stand on her own two feet.

And just look at her now. She's vibrant, beautiful even. Radiantly happy, with her new job, her healed spine, the prospect of being able to walk again…

Since when did Sveta's baby sister grow up into such a radiant young woman?

And why is it so difficult for Sveta to tear her eyes away from Kisha now? From the curve of her neck, from the swelling of her breasts and hips, and…

… No! Bad thoughts! Bad! Sveta shakes her head, slapping her palms to her cheeks, desperately wishing she could dunk her head in a cool tub of water to flush these awful thoughts out of her system…

"Hey, sis. Boba tea?" Kisha reaches down into the new minifridge by the couch's side, offering her sister a delectable chilled beverage. Caramel-colored milk tea, laden with sweet tapioca pearls. Sveta feels her mouth water at the mere sight.

"… This is because I'm looking pissed again and you know my favorite drink's enough to take the edge off, isn't it?"

"Yeah. Come on, have a boba with me. We can even share a straw~!" Kisha cheers. "Like how we used to when we were little, you know?"

Sveta blinks. Unbidden images flash through her mind. Kisha's lips on the straw, covering it with her sweet saliva. The images shift to Kisha's plump lips against Sveta's own, of the way those same lips part ever so slightly when Kisha lets out one of her plaintive mewls, the mewls she makes when her face screws up with pleasure as Sveta massages her newly-healed spine-

Nope.

Sveta swipes the boba tea right out of Kisha's hand, unwraps the straw it comes with, and forcibly jams the thick straw right through the wrapper of the drink. The petite girl glares at her little sister and pointedly takes a long pull from her drink. Mmh, sweet tapioca. There's a delicate spice to these pearls too, this tea's better than anything Sveta's ever had before…

It's almost enough to take Sveta's mind off of the new thoughts she's having about her sister.

Those accursed, accursed thoughts.

… Goddammit all. Ugh. Fine. Sveta's going to get to the bottom of this somehow. She'll just have to do some investigating on her own.

Time for a change of tactics. At this point, Sveta's just spinning her wheels, and honestly that's not her style. Primal Huntress is who she is as a Magical Girl. Sveta's meant to hunt, so hunt she shall. For clues and a potential solution to her predicament. Yes.

And there's one person who absolutely, positively has to be the source of all of the weirdness going on in Sveta's life now.

"Hey, Kisha. You mind setting up a meet with your boss for me?" Sveta blurts out of the blue.

Kisha pauses, looking up from her company phone. "… You actually want to meet mis- I mean, Alice?"

"… Yeah?"

"Why? I thought you hated her?"

"I have a begrudging respect towards your boss," Sveta corrects, before deciding to let that particular tangent drop. That's another argument the sisters have had that has yet to be resolved. "No, I just… Wanted to talk to her about a few things. And… And thank her too."

"…" Kisha eyes her sister warily. "For healing my spine?"

"… Yeah," Sveta grits out. Because it's true. That is the kind of thing that Sveta needs to address. There's a debt that's got to be paid, there. Thanks that have to be spoken. As much as Sveta distrusts Alice Takanashi, she can't deny that the perverted CEO's done what Sveta's never been able to do.

She's made Kisha truly smile again.

And for that, Sveta would've happily traded away her soul to the very devil itself.

"I'll see what I can do. Get back to your drink, sis."

"Mmh," Sveta grumbles as she takes another pull from her boba milk tea, letting the sweet liquid trickle down her throat. Unbeknownst to her, the seeds of corruption continue to percolate through her system. A heightened sense of lewdness, dark twisted feelings she'd have never thought if she were in a regular state of mind.

The pills masquerading as tapioca pearls, the pills containing portions of Alice's corruptive essence? Those have well and truly flooded through Sveta's system, absorbed through her stomach, heightening the lewd thoughts she bears towards her sister. The special cream mixed into her hair products, her shampoo, push Sveta to lean into her own catgirl side.

At this point it's a wonder Sveta even has any inhibitions left. The span of a few weeks was enough to push her to the breaking point.

Unbeknownst to Sveta, Kisha looks up slyly from her phone, taking in the way her sister guzzles down her corruptive drink. The white-haired catgirl hides her smile, even as she sends a text to her mistress. Sveta's corruption is coming along well, it would seem. Her progress needs to be reported on, this is the assignment Alice's tasked Kisha with performing.

All Sveta needs is a little push and then… And then~!

Oh, Kisha can't wait for the day Sveta truly sees her in an unsisterly light! Just the thought of being utterly and thoroughly debauched by the sister she's loved and adored for so very long's enough to get Kisha to cream her panties a little~!

Soon, soon!

Soon Kisha'll get everything she's ever wanted. Mistress Alice's promise to Kisha will be fulfilled!