When I was younger my mom remarried. My step dad was ok but I really didn't think about him much. Anyway, I used to sleep in one of my moms tee shirts and usually got one from her room before they went to bed. Every now and then I would forget and have to sneak in to get one from her dresser after they went to sleep.
This night I had forgotten and stayed up very late watching TV. It was very hot and the noise of the fans made it easy to sneak into their room. I opened the door and stepped in but as I did the light from the hall lit up the room. My step dad rolled over as the light hit him and I thought he was going to wake up. After a few seconds I was sure he was still asleep. I also noticed that the sheet was no longer covering him. There in the light from the hall I saw my first adult penis. His legs were slightly spread with it laying in full view. It was much bigger than I thought one would be even though it wasn't hard. I couldn't take my eyes off it even as I grabbed for a shirt. As I stood there the fan must have been blowing on it as his hair was moving and his penis started to grow. I could feel myself getting wet but I couldn't do anything. I had touched myself before and it felt good but that was as far as I had gone. Now I really needed to touch down there but I still couldn't move. I don't know how long I watched him but he finally rolled back over covering himself as he did. That broke the spell and I quickly ran back to my room. My hand quickly went into my panties as I rubbed what was now my soaking wet pussy. I orgasmed in seconds.
That is still one of my fantasies when I masturbate today.