When I was about 13 my older sister who was 16 was napping on the couch. Our parents were gone for the day and I was horny. She was wearing some cloth shorts and a loose tshirt and was laying on her side facing out into the living room. I decided to try and feel her tits partly because I'd never touched any before and partly because I wanted to feel hers because they were pretty big. I took my time and put my hand up her shirt being careful not to wake her. I got my hand on one of her tits and felt on it for a good 5 minutes. She didn't even move so I worked her shirt up and had a good look since she wasn't wearing a bra. She still didn't move so I started messin with her shorts, I pulled the leg up and got the slightest glimpse of her cunt. I had to see more. I had to touch it. It took probably 30 minutes but I got her unbuttoned and pulled them down enough that her pussy was in plain view. I felt on it and started stroking my cock. I sniffed it, kissed it lightly and licked it a little. I fondled her tits and pussy for quite a while quietly jerking off with my free hand. After I came I put her clothes back how they were and left her. She never said anything or acted like she had noticed, but now that I'm older I'm pretty sure she had to have woken up. She probably just didn't know what to do, or maybe she liked it. i dunno.