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red lips and television eyewear

Summary:

amanitaprincess donated $100!

amanitaprincess: aw, do you have a thing for your big sister? tell us about it

Every Thursday night, Kats sits back and watches her little sister's livestream. It's stress relief. That's it.

Notes:

originally written for Relationshipping 2022. title from "waterfalls coming out your mouth" by glass animals.

Work Text:

It's 7pm on a Thursday, and Kats throws aside her multitude of papers and identification guides, and she puts her soil specimens safe in her many plastic bins, sealed tight with the lids. She closes all the useless tabs on her laptop—the articles she's currently citing are bookmarked into a specific folder, she forces herself to close all her shopping tabs, no she does not need a bull's skull displayed in her office, she doesn't have the money for it, even if she does keep staring at it in the taxidermy and oddities shop in her area.

She shuts her blinds, turns on her lamp so a weak beam of light illuminates her vision, and she settles onto her bed. Kats opens an incognito tab and types in a memorized website address, and then tugs her own sweatpants down, electing to stay in her ratty panties and an old shirt. Kats considers digging a toy out from the box under her bed…but that's too much work, so she elects to just watch for now, maybe absently grind against her palm if she needs to.

And see, Kats isn't terribly great with technology, but her little sister, Anthy, showed her enough about how to use a VPN and installed an antivirus on her laptop for her, so she can use it on shitty porn sites as much as she wants without fear (that's how it works, right?)

The stream is starting soon! reads the text on her screen, and Kats squirms on her bed, bites her lip. She's a little impatient, sure, sure, but it's hard to be patient waiting for her little sister to start fucking herself silly on camera.

'Cause, yeah, maybe Kats isn't ever gonna admit to Anthy that she found her streams. She's especially never gonna admit that she gets off to those streams. What better way to annihilate their relationship? But Kats has always been fond of her little sister, for a long, long time—always hanging off of her when Kats was in high school and Anthy was in middle school, always insisting on trying to hang out whenever Kats came home from college. And now, as an exhausted grad student, Kats takes her stress relief where she can.

…That stress relief involves watching her sister fuck herself with toys as wide as her wrists. But Kats has always been a weirdo, and she loves her little sister! Her sweet, cute little sister. Whose stream has just started—Anthy is in her room, gazing up at the camera in a cute little outfit, a little black crop top and lacy black panties, wearing thigh-high white striped socks. Her round glasses are slipping off her nose, and Kats knows that her freckles aren't visible on this camera quality, but she still likes to imagine Anthy's cute freckles as she presses her face too close to her own. Anthy looks fuckin' adorable—she's always been a little pudgy where Kats was lanky and knobby, and the little round softness of her belly poking out from under her crop top is so enticing that Kats has to grip at her sheets tightly, already feeling a tiny thread of arousal building in her.

Anthy's beautiful, is the thing—big eyes, lush brown skin, and she's dyed her hair green lately—it's shockingly-bright, but flattering, gathered up in pigtails. As she moves, her multitude of earrings and ear piercings must clatter together, but the mic won't pick it up—that's just something Kats knows from talking with her in person. And Kats just—she has an urge to run over to her sister's place and squeeze her, maybe? Kats has always been quite affectionate—she likes touching her friends, cuddling her friends, she likes being close to whoever welcomes the attention. Lately Anthy's been brushing off Kats's cuddliness, though, and Kats is trying not to take it personally, she is! It's just…

Well, maybe she misses her sister. Maybe this soothes some of the loneliness.

Anthy is settled in front of her camera now, though, chatting aimlessly with the other viewers of the livestream. She's curling a lock of hair around a painted finger, a pretty smile curved on her burgundy-painted lips. Kats tries to ignore the lurch in her stomach as she realizes that she bought Anthy that lipstick as a gift—it's no big deal, it's just makeup that Anthy uses, it doesn't mean anything. Kats knows it doesn't mean anything, but the way her heart flutters doesn't really agree with her head.

Anthy is—friendly, she's always gotten along with others better than Kats ever did. Kats was used to being the weirdo, always stuck in her dirt samples and babbling about whatever she read from the latest mycology book she found. Anthy is better with people—a good listener, more confident when she speaks, and she can tell when people lose interest. And she's radiant now, even as she chats with random users online—everyone, everyone who can see her like this, vulnerable and half-clothed.

"Hey, everyone!" Anthy purrs. "I guess we should get on with our schedule, yeah?" She giggles, giddy and light, and she tugs off her shirt without even setting a donation goal—eager for this, and Kats squirms in place and presses her palm against herself. Kats pointedly ignores the flurry of messages in the livechat—shit like you're so sexy and play with your tits and what's your number??? It's all shit that makes a sickly, wretched disgust form in her—she doesn't like being jealous, she hates being jealous, but Kats has always prioritized Anthy over anything else, and seeing others drool over her like that…

But Anthy takes it all in stride, giggling and showing off her lingerie—she likes lacy things, and she also points towards the leather collar around her neck, a little purple charm hanging from it. Kats swallows nervously, shifting in place and balancing her laptop on her knees—bad idea, bad idea, it wouldn't be the first time she sent it tumbling to the ground after an ill-advised creep onto Anthy's livestreams—

"Mm, is there anything you guys really wanna see this time?" Anthy is saying, soft-voiced and sultry. "As always, highest donation gets the most consideration!"

Kat swears under her breath. It had taken her a few weeks before she committed to saving her credit card info on the site, but it helps a lot, having it ready to go.

amanitaprincess donated $50!

amanitaprincess: i love your lipstick! where'd you get it from?

Fuck. Fuck. Kats feels too obvious. Like, logically she can't be! She can't be obvious! There's easily a few dozen people watching this stream, and what's the chance any of them could be her? But holy shit, she feels way too obvious, and even then, the thought that Anthy might know that it's her, her big sister donating so much money just to watch Anthy do this, that—that makes her stomach clench low, hot and frenzied.

Anthy though, she notices the comment. "My lipstick? Oh!" She giggles, a light flush scattering across her cheeks. "My, uh—my big sister gave it to me." She presses her finger to her mouth in an oddly shy motion, squirms in place like she does when she's flustered. "I, uh, I really like it."

Kats swallows, heat bursting in her chest, scattering across her neck and shoulders. She shouldn't. She shouldn't. But…

amanitaprincess donated $100!

amanitaprincess: aw do you have a thing for your big sister? tell us about it

Fuck. Fuck! This is a bad idea!

Anthy's eyes go wide, her cheeks flushing even redder, and she laughs roughly. "That's—I—"

And Kats wants to curl in on herself, dig her fingers into her scalp and lament her bad life choices, throw her laptop to the side and cry, why would she say that, Anthy is gonna be upset and grossed out and—

Except Anthy's voice is small and shy. "I really like my big sister." She drifts her fingertips across her full lips, a hint of pigment staining her skin for sure. "She's so…she's always taken care of me. I like her a lot." And she smiles, lopsided and endearing as ever. "Do you wanna be my big sister, amanitaprincess?"

Kats's heart lurches and her cunt pulses. She clenches her sheets in one palm, staring at her screen in disbelief.

The livechat comments are going wild, but Kats notices distantly that there's not a lot of surprise in the chat—many of them are encouraging, saying they wanna see Anthy fuck herself to the thought of her big sister. Kats can't breathe. Kats is so turned on she might've ruined her underwear for good.

Donations keep piling up on the counter, and Anthy laughs shyly. "Aw, guys! Yeah, I—I really want my big sister to fuck me, sometimes. I have to admit that." She's touching herself idly now, cupping one of her breasts as her own hand drifts down her belly to press against herself through her panties. "A-ah—I can, uh, next big donation can choose the toy I use—"

Kats types so fast she might break her fingers.

amanitaprincess donated $75!

amanitaprincess: use a vibrator. make yourself come apart before you even get anything inside you

Anthy's voice is already breathy and rough. "You're—you're far too generous, but I gotta give some other patrons a chance to choose a toy—are we all okay with me using a vibrator?"

Kats barely pays attention to the comments that agree adamantly, nor the comments that lament the choice—no one else donates as high a sum as she did, so Anthy hums and leans over just out of view from the camera, rummaging through what's sure to be a box of trinkets, sex toys, and pretty things to wear—Kats has sent a lot to her sister's P.O. box, it's becoming a bit of a problem—and sure enough, Anthy digs out a moderately-sized vibrator, not so strong that it'd make her numb, but something that can get her off just as well.

amanitaprincess: keep the panties on

"Wow," Anthy murmurs. "You've got a lot of orders for me, huh, big sister?"

Kats presses her thighs together, and goes back to typing furiously.

amanitaprincess: turn it on at the lowest setting. build yourself up

Anthy hums to herself, turning the vibrator on and very gently pressing it to her cunt through the fabric of her panties—she's wet, she's soaked through the fabric and it's clear as anything even through the camera, and it's fucking gorgeous when Anthy whines at the contact, bucking her hips on instinct.

Kats shoves her own fingers down her underwear, pinches at her clit and then dips down lower to gather her own wetness—fuck, she's so wet she can feel it on her thighs, sticking together, she can feel the warm wet spot she's making on her sheets and she doesn't care about the mess, only the hot flittering current of want that thrums in her. Her whole body jolts as she presses two fingers inside herself to rub against her sweet spot, slick dripping onto her wrist.

Anthy herself is sighing happily as the gentle vibrations overtake her—she gets slicker and slicker through her underwear, and at some point the livechat is too much, everyone insisting that she needs to take them off—Anthy laughs raggedly and kicks off her panties, revealing her cunt surrounded by slick-sticky curls, flushed dark and open and wanting. Kats has a surging desire to taste her sister—the fantasy of walking in on Anthy during one of her streams, pinning her down to the bed and lifting Anthy's legs over her shoulders, pressing her face into her pretty cunt and drinking her up until she's shivering and crying and moaning for her.

It's almost enough for Kats, as she watches Anthy rock her hips and grind against the vibrator, slowly turning up the setting until her thighs are shaking nonstop. Anthy's pulled her bra up, groping at her own tits and pinching her nipples with a fevered desperation as she squeezes her thighs together. Anthy's voice is lilting and noisy, her moans and gasps spilling from her lips and loud in Kats's headphones. Kats watches, enraptured, as her little sister comes hard, her whole body overtaken with quivers and her head thrown back in pleasure. Anthy cries out something incoherent, something that Kats desperately wants to be her own name.

Kats watches her sister come down from her orgasm—Anthy shivers and turns the vibrator off, her body still shaking, sweat gleaming on her skin. She's panting, and she giggles when she looks back to the chat and then at the camera lens.

"H-hah—was that good, big sister?"

Kats whines through her teeth, desire still pulsing in her veins, still flickering in her cunt. She once again types.

amanitaprincess: we're just getting started, sis

There's no way she could know. There's no way, no matter what kind of mischief is splashed across Anthy's face. Kats is gonna take the chances she gets. Even though Anthy doesn't appear to be paying attention to anyone else's requests, even though Anthy is wearing the lipstick Kats gave her, even though Anthy is talking about wanting her big sister to fuck her—

Kats feels starry-eyed, fuzzy-brained, she feels struck.

"I'm happy to do more for one of my favorite donors," Anthy purrs. She winks at the camera, and then she reaches into her toy box again.

Kats is more and more unsure about how subtle she is, but she's decided she doesn't give a damn. She'll send Anthy more pretty things. She'll send Anthy more money. She'll think about the taste of Anthy's cunt, the sprawl of her wild hair, the soft roundness of her thighs and cadence of her voice caught in a gasp.

Anthy gives the camera a knowing look, and Kats—

Well. Kats loves her baby sister, Kats will give her anything. It's 7pm on a Thursday night, and Kats settles in to indulge in her stress relief. And she's definitely going to make a call to Anthy tomorrow.