This is a print version of story My girlfriend's little s****r by youngcock28 from

My girlfriend's little s****r

I've been with my girlfriend for about 6 years now. We have a good sex life, although her sex drive is not nearly as high as mine so we don't have sex as often as I'd like. She has a younger s****r who's 18 and I'll be honest, over the last couple of years I've wanted her more and more.

Both my girlfriend and her s****r still live at home with her parents, and naturally I've pretty much moved in there as I've gotten more comfortable. Her s****r has gotten more comfortable around me too. I'm not sure if its that she's just getting older, or if she's trying to get me to notice her but it seems like each passing week she's wearing skimpier and skimpier clothes.

I had spent the weekend at my girlfriend's house the other weekend, where I have to sl**p downstairs on the couch because her parents don't allow me to stay in her room. Her s****r's room is downstairs too. At some point overnight, I saw a light on, and noticed her s****r was up and in the bathroom with the door opened. When she came out, she was wearing a white t shirt, with no pants and her sexy little ass was barely covered. I got an instant hard on. She has such a perfect, perky round bum and I couldn't help but want to get up and press my cock against it. I didn't however, and eventually fell asl**p.

The next morning I was up watching tv downstairs and she comes out of her room and sits beside me on the couch. I hadn't really gotten up yet so I was still laying down, wearing just my briefs. She had super sexy shorts on and was wearing a white tank top - without a bra. I couldn't help but notice her nipples busting through her shirt. I again got very hard. I've watched her tits get bigger over the last few years and I find myself more and more attracted to them. They aren't huge by any means, but a nice full C cup. As I look at her, I can feel my cock throb for her. Her smooth skin, sexy legs, perky tits and soft lips make me extremely horny. I tried to hide the bulge I had under the blanket, but I was already laying on my side and didn't want to move too much and make it obvious I was hiding something. So I just sort of layed there, hoping she might notice it secretly.

I asked her if she was cold, being in the basement and all. She smiled and said not really. We didn't say too much after that but I couldn't help but feel like she was trying to seduce me. Anyway, whatever she was thinking, neither of us made any moves at that point.

That night, my girlfriend and I were fucking because we thought nobody was home. However her s****r was home, and I saw her peaking at us through the doorway. I instantly got harder and my girlfriend moaned loudly. She definitely noticed. I pretended I didn't see her s****r looking at us and continued fucking my girlfriend doggy style on the edge of her bed. I got so excited knowing her s****r was watching us that I felt the urge to cum. I pulled out and shot a massive load all over my girlfriend's back.

I haven't worked up the courage to act on anything with her s****r yet. But I can't help but wonder if she liked what she saw. If she is thinking about me late at night. If she wants me as badly as I want her. Stay tuned.

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