This is what happened when I was staying at my 16-year-old cousin's house.
My mum and dad were going overseas for the whole week so they arranged for me to stay over at my cousin's house. There, I had to share a bed with him because they were living in a small apartment at that time and there wasn't much room. Well, I have always been scared of my cousin because he never seemed to like little girls so I wasn't very comfortable with the thought of sleeping with him.
That night, I got in bed early, closed my eyes but couldn't go to sleep. Soon after, my cousin came. He must have thought I was asleep since it was so late so he got changed in front of me. He was only wearing a pair of boxers when he came in to bed. After a while, I could here him pumping his dick and moaning, then still assuming I was asleep, he turned over to me and started touching me, pulled my shirt up and felt my breasts. At this, I think we both were really turned on. Next, he pulled down my pants a little and touched round there. This must've made him very horny and he shot cum all over the bed.
But the weird thing was...he never knew I was actually sleepin!