Im 13 an my mums friend Helen and her daughter Kiley moved in with my us after she and her husband seperated. Kiley is 11 and very skinny and short. One night about 6 months ago my dad found her hiding in the hamper watching him shower. Helen was very mad at her and spanked and punished her for doing it. About a month went by and one afternoon I was in the shower and saw the lid of the hamper move. Right away I knew she was in there watching me. Instead of being mad it gave me a hard on knowing she could see me. I was almost done when I noticed she was watching but instead of getting out of the shower, I put more soap on my penis and let her watch me masturbate. I did cum right away and couldn't believe how much it excited me. I masturbate a lot but never did it with anyone watching me. I don't know if she ever watched me before and have never told her I knew she was in their. Now I always try to shower if we are alone or most of our parents are out. I always ask her if she needs to use the bathroom and tell her I'm going to take a shower soon. When I do tell her that I know most of the time she will be in the hamper. I don't always masterubate but do most of the time and stop sometimes so I won't cum to fast. It makes me cum faster when I know she is watching me. After I leave the bathroom I leave the door wide open. When I get to my bedroom I always peek out of the door and watch her climb out of the hamper. I never let on that I know she is in it and never say anything about it to her. I don't think she does it when my dad showers anymore and a few times my dad has told me to always check the hamper before I get undressed. I never thought I would like being watched like that.