Caught by My Sister

I live with my mom, dad and my younger sister. My sister is 16 and she doesn't have a boyfriend. I always like to masturbate with my sister's panties and put them back where they were. She never found out until this incident happen a few months ago.

Mom and dad went out for shopping. As usual I went to my sister bedroom and took her panties and started masturbating. Just when I was about to cum, I heard my sister's voice. I couldn't control it and I came on her bedroom floor. Quickly I put her panties back where they had been but I didn't have time to clean the cum on her bedroom floor.

So she came and asked me what I was doing? I told her that I was looking for my CD's. She told me, she didn't have any of my CD's. Then she saw my cum on her bedroom floor, and she said 'Oh my God, what is that on my bedroom floor?'

Then I quickly came up with an answer and I said I was sorry and that I had flu and didn't have a tissue with me. I promised I would clean it and she said I had better. She said it is very disgusting and to clean it and not to ever come to her room again. I cleaned it with big tissue.

I am still not sure whether she knows or not. I know she doesn't have a friend and maybe that is why. Now I still do masturbate but not in her bedroom.