Incest Seduction/Go have another shower to cool off
A quick shower might help, even if you just had one 20 minutes ago. It's probably the fastest way to cool your rising libido. Not even bothering to dress, you head right back out of your room and dart down the hall for the bathroom. You duck inside with a grin on your face. A brief thrill tickles your spine from running around like this. You glide in around the edge of the door, facing it the entire time, then smoothly push it shut from inside. Leaning into it you hear the latch click then roll from your shoulder to your back with a quick sigh. Your sigh turns to a gasp when you notice your sister staring at you from the sink.
"What's up with you?" she says suspiciously, raising an eyebrow and eyeing your naked body.
You can feel your spine tingle again and your cheeks flush with a new rush, now one of raw embarrassment. You're utterly exposed and it feels like she knows everything that just happened to you with one questioning look. After a moment stuck in the headlights, you place your hands between your legs in an attempt to hide the arousal that is still so present in your mind. Your lips are so warm and they're so responsive to your touch that you swear your sister can already tell how hot and bothered you are with her leering gaze. Both of your knees turn in without being told, bumping into each other as your body seeks some added level of protection.
"I... I just..." You don't even know what to say. Caught mom and dad fucking? Showed them your naked body? Saw daddy's huge dick? Got so incredibly turned on? But you can only cower, lost for words.
Dawn rolls her eyes. "Just pee already, gawd."
Oh. That works. You ran in cause you had to pee. Well, you don't, but at least that's believable. Easier to just go along with it than counter anyway.
You step away from the door and slink your way past your sister to get to the toilet. She's still in her PJs, stretchy pants and a thin, loose cami top that she frequently wears to bed. What you wouldn't give for your robe. Why did you have to be so impulsive just now?
Sitting down, you grab both sides of the seat and latch on as tight as you can, wanting to ground yourself as you begin to feel dizzy with so many conflicting emotions.
"Yeah. I dunno, my little sis just barged in here."
You look up at Dawn beside you. She had her phone held up in front of her when you entered, but you didn't think anything of it at first. Only now do you notice she also has her earpiece in.
"Yeah! No, she is, she's totally naked. See?"
Dawn points her phone toward you. Is she video chatting someone?! She pulls her phone back after a couple seconds and starts giggling.
"Totally! ...no, she's real weird. She isn't even peeing, so... No, really, she is! Look!"
The phone is aimed at you again. You furrow your brow and lean to one side but Dawn follows, stepping right in front of you to get a better angle.
"Dawn! Quit it!"
"What? You're the one who barged in totally butt naked! And... wait, Jess wants to talk to you."
Dawn taps a few times then takes out her earpiece and moves her phone even closer to you.
"Ohmygod you are! You're totally naked! Do you, like, walk around your whole house like this?"
"N-"
"Legit? Woah!"
"Hey girl! Spread those legs!"
"That's Kim right? She like twelve now?"
"Them itty bitty titties! They're so cute, I just wanna..."
"No way! She's gotta be ten."
"...so isn't Dee lezzie with her sister too?"
A bunch of voices are talking over each other excitedly, which is even more confusing. Dawn flips her phone back to address her friends. "Oh yeah, we TOTALLY lez out, all the time. She's a tiny freak, but she freaks hard."
"Freak? I'm not..." you trail off, offended and confused, still unable to wrap your head around what's even happening. Dawn is acting so weird, but that's the most you've said or done since sitting down, although it was barely even audible. As your wits slowly come back to you, you realize you should at least cover up. How many people are in this chat anyway?
"Don't even! You love it!" Dawn insists, her camera trained on you once more.
"I'd totally lez with Kimmy. Dee knows what's good."
You finally raise a hand to cover your chest but Dawn grabs your wrist and tugs at your arm, trying to get you to stand. That gets you a little angry and you start to resist her without trying to freak out too much lest you validate the "freak" thing she said to her friends. Dawn just laughs a little at her phone while her friends continue jeering. She then points them away and leans into you with a hushed tone.
"Play along, okay? Just... it'll be fun. Help me out."
You take a moment to think about it. Weirdly, you comply. She guides you up off the toilet that you weren't using and pulls you in close to her so you're both in the video frame. But it's not what Dawn said that convinced you, it's the way she said it. The look on her face. Like she really needed you for some reason and didn't even realize until you walked in, like this was a strangely important accident. And despite how prissy or how much of a tattle-tale she can be, you've always looked up to her. She is your big sister after all. Although maybe part of the shock is that this is a side of her you just haven't seen before.
Struck by all this, you stand awkwardly next to your sibling while she openly gropes your small tits on camera. Dawn is laughing nervously, her phone held at arm's length, but she's earnestly playful with your modest chest, sensually petting and squeezing with care.
"They're not big, but they're still really fun," Dawn explains, as if she's done this with you dozens of times. You start to wonder what she's said about you to her friends but she's already convinced you to play your part, whatever that is. Of course it's hard to stay in your role when someone is tweaking your nipples. All you can do is bite your lip and cup your crotch while she plays with you, your confusion and arousal steadily building higher.
"OMG! They're doing it! Right now!"
"Are those grade school titties?"
"She's so teenie and cute!"
"I don't see lezzing yet," someone else comments, sounding almost bored.
"Gawd, really guys?" Dawn pulls away to make you the center of attention. "Kimmy, how about we show them what you got?" She follows that by nodding her head and mouthing 'please' from behind the camera.
What is she even asking? She wants to... kiss? Your big sister wants to make out with you? And while you're naked?! Really, what is it that she's trying to prove? First, you're not supposed to just openly grope your sibling, or at all really, let alone in front of other people. And yeah, it felt good, and you're even flattered she complimented your boobs, but it's just not allowed. But maybe... that's part of why it felt so good? Maybe this is normal for some girls. Teenagers are supposed to go crazy, experiment, have fun. It's like a frosh or a rite of passage or something. You've never had nearly as many friends as Dawn, so you really wouldn't know. Still, this sure sounds like a weird way to become popular.