I'd had one of those days at work that makes you wish you could run off and join the Army or some such thing. The job didn't end until well after dark and I was tired. On my way home I stopped in at my favorite Bar for a beer or two, so I was not really feeling any pain when I pulled up to the house. I parked my car and entered my parents 2 story house. It was quiet so I knew my parents were out again, which was fine with me. All I wanted at the moment was a shower.
I went upstairs and stepped into a nice warm shower. The flow of the warm water over my body felt good. While I was washing my hair I thought I saw the door to the bathroom open further than I had left it. I could have been wrong. I dried myself off and with just a towel wrapped around my waist I started for my room. When I am alone I rarely worry about getting dressed right away. As I passed my sisters room I could heard a noise and thought I would peek in and see what the noise was. Boy was I surprised!! It was my sister on her bed one hand was playing with you breasts and the other had opened the top of her pants and she was sliding her hand between her legs and massaging her pussy. I could not take my eyes off her young body. I don't know if it was the beer or what, but I felt myself drawn towards her. My hand started to gently rub my now hard cock. The towel did little to hide my excitement. I moved into her bedroom.
She was still playing with herself and I was getting more aroused as I got closer. She saw me and yet she did not stop what she was doing. She saw my aroused cock and reached out and pulled my towel from around my waste. "Take your shirt off sis. I want to see your breasts." I heard myself say. My voice seemed to get husky. I could not believe that I had said that. My sister removed her shirt and exposed her very nice breasts I took one in my hands an started to fondle it.