I Saw My Sister

When I was fifteen years old I went to my sisters house to pick up a few things. I knocked on her door but she didn't answer so I let myself in. As I walked around looking for her I realized she was in her room, as I was walking towards her room I heard a lot of moaning I looked in her room and saw my sister watching a porno movie and she was on her bed naked.

At first I tried to look away but I got curious to see what she was doing. When I took another look she had her legs spread and she was fingering herself, then she started to moan as she was doing this. I got turned on and started to masturbate. She started to moan more louder then I saw her cum hard. When she finished she put her fingers back in her pussy to taste her cum. At this point I have also cum and I put my pants on and left. After I realized what I saw and did, I felt like I did something wrong but reading other peoples stories on this website I realize that every one has had some kind of sexual experience with a sibling, so I don't feel bad about myself anymore.