The front door. At least they might not think I'm a burglar.

You panic for a moment when you realise you don't have your bag with you; after some frantic patting, trying to ignore the warming sensations that provokes, you realise that the think silver chain around your neck has a couple of keys on the end of it, dangling into your cleavage. It's not suprising you didn't notice them before, given the, er, surroundings.

It's the matter of a moment to unlock the door and step inside, though you have to hold it open longer than you'd like to fit your boobs inside. You take a second to collapse back against the wall behind you, eyes closed in relief. Whatever else might be going on, at least you're home.

"Whoooooooo is it?"

You start, leaping forward from the wall, your eyes picking out the corridor leading off the hall and down to your room, but you've barely got a foot off the ground when the caller swings herself around the arched doorway to the lounge.

Your mouth drops open.

Your sister's only a few years younger than you; this past year she started the same college as you, but she's often mistaken for a girl still at the tail-end of high school. She's always been pretty, even after she started going for a gothier look and began dying the light brown hair she shared with you black and started wearing cobwebbed patterns, laced sleeves, and nothing brighter than a dark grey. And she didn't, in a comparison you'd never thought to make before, look like a slut.

This girl does.

A black tank top, almost a copy of yours if it weren't for the colour, does its best to contain a pair of tits as big as her head. That's cocked on one side, your sister's heavily made-up face beaming across at you as her pigtailed black hair dances a little as she shifts from side to side. Her face is flushed; with a twitch you realise as you look down at the pair of frilly black panties that are all she's wearing below the waist that the reason for that is that she's currently got one hand stuck down them, fingers moving beneath the material.

"J-Jenny?"

Your sister grins. "Hey, Taylor! How come you're home from classes so early? I thought you said you weren't back 'til later?" You sigh thankfully as she pulls her hand out of her panties as she walks over to you, only to realise the warm hug she gives you only has one arm wrapped around your neck. The other trails down your back to cup your rounded ass, and with a giggle the girl that used to be your sister gives it a firm squeeze. You feel hard, pointed nipples pressing into your chest, and it's only when you feel your own firming and hardening themselves that you're jolted enough to push her away. "Jenny, what... what the hell's going on?!?"

"What d'ya mean?" Pulling back with a little pout, your sister places her hands on her hips. "What's going on?"

Her innocent response is almost all you can take. "I mean, why the hell do you look like that? And - aren't you shocked how I look?!"

"No?" She looks you up and down, and you blush. "You look the same as normal, I guess. What's wrong with how I look?" Running her hands up and down her body, sliding over her voluptuous curves, Jenny licks her lips. It looks like less of a check and more a prelude to a lapdance. "Do you mean the panties? Sorry, you know I can never be bothered putting anything back on after Charlie fucks me. I can go throw something on, if it really bothers you."

"No! I mean, yes!" You know, Charlie, sure, they've been dating for years, but Jenny was always planning on saving herself for marriage. "You've... you've been... with him?"

"Fucking?" Your sister looks at you quizzically. "Suuuuure... you know I have? You were just being a total bitch and complaining last night about the noise we were making. So, come on, I had to make it up to him and have him over today for another go." She wriggles a little in place, sighing contentedly. "I was so **** for it, I can't even tell you."

"But.... but....."

"What is up with you today? Honestly, you look like you just saw a ghost." The look on her face of worry must match what your own, but after a second or so it dissolves into an understanding smile. "Oh, I get it. You're jealous. Look, I told you, you're free to get fucked by him any time you want, I really don't mind. We can share." Her eyelids droop and her smile widens, showing a little teeth. The voice that comes out next is sultry, smooth. "We can even share at the same time... if you want..."

For you that's the final straw. Trying desperately to ignore the sudden heat that ignites between your legs at the idea, you push past her, and sprint down the corridor to your room, slamming the door behind you. Your sister's muffled voice through the door sound hurt. "Oh, fine, see if I help you out again." You don't dare to move away from the door until you hear her light steps moving away again.