i'm 18 years old, my sister is 16 and I am totally infatuated with her. Every time I masturbate I think of her, looking over me, straddleing my waist with her creamy white skin and perfect breasts, in my mind they're just the right size. I can just picture her face, looking at me seductively, it makes me more horny than anything else in the world.
I've seen her naked before, looking under the bathroom door when she gets out of the shower, when no one else was around i'd get down on my stomach and use a small mirror to look under the door frame. It's sad I know but i can't get enough of her. It's not like i'm a freak who's never been with a girl, i've had sex with one person. It was over the course of last summer. I've been with a few other girls, but only all the way with that one. My sister's no supermodel, but to me she has the perfect body, creamy white skin, very thin, shoulder length dirty blonde hair, perky breasts that are just the right size, with small pink nipples.
She has a boyfriend whom i know. I'm attendiing college a few states away, but i can assume they're having sex, which is usually the object of my masturbation. I can just picture the two of them naked together in her room. i wouldn't say i'm jealous, but I do feel something in the way of envy. When i'm home i'd try to spy on them through a window from outside the house.
Typically we get along fine, just like any other brother and sister, since i've left home for school our relationship has even grown closer, since we're not in each others face all the time.
Over the summer we'd swim at the neighborhood pool in my aunts condo complex. She's looks so sexy in this one bikini, i'd always fanatsize about us skinny diping, and us just being naked together.
After this I started to wish we had more of "casual" relationship. So on hot days when no one was around, i 'd walk around without a shirt on and act totally normal, I don't want to brag but I have a fairly toned chest and stomach. At first she was a little wierded out, but she soon got used to it. before long when we were alone she'd only wear a tiny little tank top, exposing her cleavege, and shorts. By the end of last summer our relationship was so casual we were at the point where, when one else was home, we could spend the day with me just wearing boxers or shorts, and she'd just walk around all day in a bra and panties! -No joke, victoria's secret, cleavege, exposed tan lines. It was great, and we'd have a perfectly normal Day, doing the same things as usual- just with less clothes, isn't that every guys dream. I was in heaven.
This is where all my fantasies start, with us being alone, brother sister, partially naked, i'd always dream about us being naked together and having wild sex in various places around our house. When i'm thinking about her I'll close my eyes and vividly create this passionate situation between us filled with sexual tension, of course it always ends with us having sex. i'll lay down on top of her straddleing her waist. She opens her legs a little, we exchange looks both knowing what we're about to do. I slowly penetrate her. I imagine the look on her face as I penetrate her for the first time, our dreams becoming a reality. We pump, together in time, pushing hard as the full length of my penis slides into her. I imagine moving my arms up and down her smooth, slendor body. I look down at her and she's in a state of ecstacy as I slide in and out of her. I imagine her repeating something like: "oh my god I can't believe we're doing this" over and over. The two of us aware that we're tasting the forbidden and it making us all the more passionate. As our naked bodies pulse together i time, we stare right into each others eyes only breaking our gaze to occasionally for a passionate kiss, i'll start kissing her neck, and work my way up to her mouth where are tongues wil intertwine.

For the most part I think she's oblivious to my affection, sometimes I get the feeling she's leading me on! There was some story/rumor that went around my high school last year about these siblings who had had sex. We'd talk about it, she even would talk about this friend of hers, who she deemed "sluty", who would walk from the shower to her room naked in front of her brother. While other times I get the opposite impression. I would never act on my feelings, and given the opportunity(which I know will never come), I don't even think I physically could.


Any one else infatuated with a sibling, or know some cool web links?
Sing out if so.