My sister and I live in the house where we grew up; I'm 25, herself 24. Our parents gave us this place when they moved to California, and since then, it's been just like when we were growing up, but without them. Of course, there's always been some weirdness about my feelings toward her, but it didn't get really bad till we moved back in.
I'm lying in bed, when I hear her come home from work. My sister Lindsay works full time at a diner in town, and she often comes home after I've gone to bed. I listen as she comes up the stairs, then closes her door, at which point I jump to my feet, and I sneak out of my room and quietly creep up to her door. Due to the age of this house, none of the doors close all the way. Carefully, I crack her door open, until I see her walking around in her underwear.
I don't know why I have such a burning lust for her, but I think the fact she's my sister is what excites me so, because it's just so wrong. It's like the ultimate taboo.
I see her lower her bra straps, then reach behind her, and, with a sigh, unhook it, and I feel my cock getting stiff, as she slides it off, revealing her large, squeezable, suckable titties. Many times, I've fantasized about what I'd like to do with those beauties. Even during the day, around the house, I'll catch myself staring at them, daydreaming about tearing her shirt off, and just taking out all my lustful urges on them.
She sits down on the bed, and starts rubbing her tired feet, and, as I rub my cock through my sweatpants, I have to resist the urge to barge in, spread her legs open, push her panties aside, and stick my tongue in her pussy. I've never caught a glimpse of it, because she only takes her panties off in the morning, before taking a shower, and the bathroom doesn't provide a very good view.
I know the show is over when she puts on her nightshirt, and then turns off the light. I go back to my room, and jerk off, thinking about all the things I'd like to do to her.
The next day, I'm watching TV, when she comes in.
"Bobby, can I talk to you about something?"
I turn off the TV. "What is it?"
"What were you doing outside my room last night?"