When you are a teen you do dumb things. I was 15 and my sister was 14. A boy, really he was already a young man because he was 20, liked me and flirted with me. For protection I always had my sister with me. He got frustrated because I would not let him touch me, I mean like grope me, I let him touch me but lightly, flirting back. But that day it was like he wanted 'it'. He grabbed me by the crotch and started to hump my back, he got his hand down into my pants and started to finger me, he erection was up against my back side, he pulled his hand out and was getting my pants open, and pushed my pants down and with my pants around my ankles he got me to bend over the easy chair and I felt his penis go into me, for a slight moment I was paralyzed but them pleasure took over and as he fucked in and out I just gave myself to the ordeal.

When he pulled out he asked me to use my shirt to clean his penis. I still had my pants around my ankles, I asked my sister to get a dishtowel in the kitchen and I cleaned his penis. It was the first time I held a naked penis, I was really gentle I didn't want to hurt him. After he was clean, I used the dishtowel to clean myself and pulled up my pants. I told my sister this was a secret never to be told.

We had sex a lot, daily if we could. He was never satisfied. Not once in all those months following did I have sex without my sister being there with me. One afternoon, before he had sex with me I asked my sister if she wanted to try. We got her pants off and she laid back on the bed with her legs open and he leaned down over her, I took his penis and pointed it up into her vagina and she found nirvana.

She liked sex, and she was far more willing than me to try something new. Positions, oral sex, letting him lick her back side which I found gross but she liked, taking it from him by riding him. She tried the positions, and then I followed, except for the licking the back side. All this time he pulled out when we were in the unsafe zone, but otherwise we let him go for it. We liked being ejaculated into, instead of on our stomach or our back. We never once bought or used a condom. We didn't lose at this game of roulette until I was 17. Once I lost, she allowed herself to become pregnant too.

This turned out to be a serious problem, she was still 16 and technically a minor for sex, and he was by then 22 and an adult. The only thing we could do was for her to get married to him.

Our sex life with him is great, we both enjoy our sex life and we are pretty much uninhibited about having sex. Although we have over all this time had sex one on one, most of the time we are together when he has sex with us. I am 34 and she is my baby sister and we both have kids that are more than old enough to look after themselves. But when it comes to sex, its my baby sister and me, that is when it feels right, when my baby sister is with me.