I had sex with my sister, and this is something that I have told anyone. It happened the summer that I was seventeen and my sister had just turned eighteen. Mom and dad went away on a trip together for a few days, so it was just Barb and me in the house. I had always gotten along quite well with my sister. She's tall, blonde with a sturdy build, very athletic and popular in school, with a great easy going, but straightforward personality. When it came to boys, it seemed like she dated quite a few jerks, and never had much luck when it came to guy relationships. The one guy she had really liked, and who had been really nice, had moved away the year before. I had sort of suspected that my sister had a little bit of a between-girls fling with her best friend a few times, although neither of them were hardly lesbos. Barb had never been a prude, and I had actually glimpsed her in the bathroom on more than one occasion nude, and she never had any problem with that.
Anyway, mom and dad had left early that morning, had called from the airport, and were on their flight. I was sitting in the living room, and my sister had gone to take a shower. A few minutes later she walked from the bathroom, going back to her room. When she went past the doorway of the living room, I saw that she didn't have a stitch on. Of course I was a little surprised. She just gave me a big smile and reminded me of how I had seen her in the all-together before. I said something like, well ... yeah. Then she said how mom and dad weren't home, and she liked going naked, and didn't mind if I saw her. I was trying to act nonchalant about it, and replied how I didn't mind, either. Well, while we were sort of discussing this, she had walked out into the living room, quite unabashed. It was the first time that I really had gotten to see her naked for anything appreciable length of time. I had to admit that she was quite good looking. Her breasts were full, but not large, and she had quite sizable nipples. She also had, as I was sort of aware, quite a bit of sandy pubic hair. I also remembering being aware of what nice legs she had, and thinking that she seldom painted her toenails, preferring them to be plain nude instead. She was quite tan, with the white areas of where her bathing suit had been showing nicely.
So I'm sitting there, not quite knowing where to look, but at the same time having no choice but to look and feeling a tiny bit awkward. She noticed and smirked at me, asking if I didn't like how she looked. I said, sure, but that she was my sister. She said how that didn't mean I couldn't look or like what I was seeing. Then, being very blase about it, she said how she kind of liked having her brother think she was sexy. So I told her that I thought she was very sexy, and that made her happy. She gave me this pleased look, and remarked on how mom and dad weren't home, and that we could always take advantage of that and have some fun. I couldn't believe she was saying that, and I suppose it definietly showed on my face. Then, acting quite innocent about it, she said how she had always thought that it would exciting having sex with her own brother. I nervously mentioned not wanting to get my own sister pregnant - which was a very real consideration. Barb just shrugged and told me how mom had put her on the pill a year ago just to be on the safe side, and so far had not had the occasion to try it out. I have to confess that this did make a difference in my thinking, even though I was still mostly dealing with my sense of surprise. Then, being quite nonchalant about it, she said how I could take my clothes off and be naked too, and we could see how it went.
I have to admit that my sister undoubtedly felt a whole lot more comfortable and uninhibited about her body and being naked, than I did when it came to my being naked. Still, since she was all right with it, It went ahead and got undressed. It was kind of immediately exciting being naked like that with her, and I sure had no problem in getting a sizable and very stiff erection. Well, Barb and I laughed and we hugged, and we did some playful little kisses on the lips. And the next thing that I think before either of us knew, we were making out pretty good, with me feeling her breasts, and her feeling my cock, and me running my hand between her legs and feeling her thoroughly wet vagina, and her bending over to take my penis in her mouth. It was really fantastic! Remarkably, it all somehow seemed perfectly normal and easy to be doing this together. Wer ended up screwing right there on the living room floor. I gave her every inch of what I had, and she lay there moaning and moving with me, and having a pretty outlandish orgasm. Then I got to enjoy leting my erection ejaculate inside of her, and the incredibly sensation of giving my own sister my sperm. We recovered, stayed naked, had something to eat, and an hour later we were at it again. We went into her bedroom, and she bent over the bed and I slid it in from behind, and we did it standing. We were both like sexual athletes, me with my hard, hard boner thristing in and out of her, and he wiggling and moaning and pushing back. At one point I slipped out. As I prepared to put it back in, Barb said, "Oh, yeah! Put it in my butt!" So I pressed my boner up against her tight anal opening and went in. She moaned and groaned, and I ejeculated in her butt, with her mastuirbating her clit to another healthy climax while I did that.
For the next several days, Barb and I had sex I don't know how many times. She even gave me two blow jobs in the process. It was so fanatsic doing this together, and we both loved every minute of it. Then, mom and dad came home, and Barb and I acted like nothing had happened. That everything had been perfectly normal. I suppose in a way it had been. Just two sibblings sharing a little bit of lustful fun. That was quite a few years ago. Although since that time, Barb and I have amanaged to have several more very satisfying amorous encounters. That's our secret.