It's family dinner Friday at mom and dad's, so we're both hanging out and enjoying a good meal like old times. I excuse myself to the bathroom, saying I need to make more room for dessert... but really I'm just horny. You have a sneaking suspicion something is up so you take a peek into the bathroom door without me knowing you're there. What do you see? I look like I'm just trying to pee. But then I start touching myself. I look around, listening for the sounds of anyone coming up the stairs, then when I think the coast is clear I start rubbing my pussy. I masturbate with my fingers until I cum (about 3 minutes) and you get to see a really kinky side of me as I bring myself to orgasm. Once I finish, I tinkle out a little pee, wipe, flush, and go to wash my hands... and that's when I notice you spying on me! I whisper-yell at you, then drag you inside the bathroom with me, quietly closing the door. After I give you a somewhat humiliating scolding about how wrong it is to watch your sister go to the bathroom and MASTURBATE, I decide there's only one way to cure you of your unhealthy obsession with me. I tell you I'm going to let you jerk off to me and finish quickly in your underwear so we can get back to the dinner table and never speak of this again. Unfortunately, being put on the spot like that makes it kind of hard for you to cum. Realizing you need a little help, I show you how to jerk off, telling you to go faster, and start taking off my clothes. After some intense upskirt teasing with my pussy and ass in your face, I start to get horny too and decide there's only one way to make you cum. It's a little taboo, but it will have to do. I tell you to put your cock in my mouth. The warm wetness will surely make you cum, then you can just finish inside my mouth and I can swallow it and mom and dad won't be any wiser. I give you a blow job, gagging on your bulging dick, until you cum. Some of it squirts out in my mouth and I open up to show you, but you start to cum more and... well you'll have to watch to know what happens at the end! -B