This happened last year, and I finally have the guts to write about it, after reading everyones stories.
Last year our parents went on a second honeymoon, to Las Vegas, and they wanted us to stay over at one of their friends houses just to be sure we were fine. I was 17 and my sister Jen was 15, we were staying over at Ginelle and Tom's house, but they only had one spare bedroom so we were forced to share.
The first night Jen and I just got ready for bed, she wore pink cotton panties and a tank top and I wore a pair of boy shorts and a t-shirt. This didnt seem odd as we've gone on vacations and seen each other. We just got into bed, and went to sleep.
The next day I kept getting this feeling about my sister, but I had never thought of her that way or even other girls, but that night something happened anyway. We had both worn thongs and so thats what we were wearing to bed, along with tank tops, I felt a stirring in my pussy like never before. I plucked up the courage and complimented Jen on her thong. She thanked me and returned the favor by giving me a light tap on the ass and laughing. We got into bed and after a while I said I was hot, and took off the covers. Jen said she was also, but like the blankets, she suggested we take off what little we had on and then sleep under the covers. I was blown away, did my 15 year old sister just say we should sleep nude together? I couldnt believe it, but I agreed and we both got naked under the covers.
After a few minutes, she admitted she was really wet from being this close to another naked girl. I told her that I was as well, and then asked if she liked to jill? She admitted she did, as did I. Following this we talked about how we did it, and when we did it last, the tension was so high, and then it happened we just instinctivly reached for each other. At first it was just a hug, then she told me that she had been wanting this for a long time, and kissed me. Over the next few minutes we explored our bodies. She moved her hand to my hairy mound and fingered me like I had never imagined. I did the same to my sister Jen's peach fuz pussy. Her hand going in and out of my soaking pussy. We both had the most amazing orgasms of our lives. This was the start of something wonderful, as the days went by, we became more than sisters, but thats a story for another time.