When I was 25 I moved in with my now wife's brother in law and sister and her two children, a boy and a girl. The girl was 18 at the time. She was very hot and she had massive set of tits. After living there awhile I noticed the only door with a doorknob was the parents room. The step dad didn't want any locked doors, so there was just a hole there in the door. One day Me and the kids were there alone and I was going to take a shower. The mirror in the bathroom was in front of the door, and I turned on the water and started taking my clothes off, and I glaced in the mirror and to my suprise I can see an eye looking in on me. So now totally naked I turned and took a leak peeking at the mirror to see if she was still there. Then my cock started to get hard thinking about those big tits, and I started to stroke my cock, now fully erect and she was still watchin, so I jerked and walked closer to the door to give her a real good view.