My sister was home for Christmas vacations from college. She was 20 and I was 18. I had just gotten a car, so she asked me to take her out sometimes because she wanted to party hard like I have done for so many years. I told her that I would the following weekend. I had always wanted to fuck my sister, but I had never had the chance to. She usually wore very revealing clothes around the house, and hardly ever wore a bra, especially at home. When she went to sleep she would always wear a thin, tight t-shirt with no bra and small tight shorts. I always noticed that her nipples were hard but I never did anything about it.
Saturday came, and I told Rosa that we would be leaving to the party at about 9. I told her that I was going to also take my two other friends. She didn't really care. As we were leaving for the party I got a called from a friend, but I told my sister that it was my friends to tell me that they were not going to be able to go to the party. I had really never invited any friends. I had planned to have the whole night with my sister. She said that it did not matter that my friends were not going.
When we got to the house party I saw some familiar faces, but none of them new that this was my sister, nor was I going to tell them. The first thing my sister asked for was beer. I loved drinking and so did she. We started to drink, and after about 6 for me and like 4 for her, she told me she wanted to dance. I hesitated because I was used to dancing with other girls in a very sexual manner. Of course I wanted to dance with my sister like that, but I didn't know if she knew what she was getting into. I said OK, but I decided I would dance a bit far from her. We kept drinking and dancing.