I am actually 13. It was New Year's Eve and my sister was having her best friend over as usual. When we have sleep overs we have them in our basement so we don't wake my parents. After the ball dropped, I layed downin my sleeping bag on the floor next to the bed where my sister and her friend were going to sleep. We were all watching tv when i started to think about how hot my sisters friend was, she was my height with a nice round ass and normal sized perky tits (she was 16 by the way)when I decided that I would stay up until after they fell asleep and grope her as she slept. I immediately told them I was going to sleep. I fake slept until 3 am, I then leaned forward in my sleeping bag, as hard as a rock, my young hormones surging. I whispered her name a few time to see if she was awake, she wasn't. I started with her tits, she was wearing a bra and I decided it was too risky to go underneath it. So I just felt them through her shirt, they were to first ones I'd ever felt, they were so nice and firm, even thinking about her now makes me hard. I then got the balls to lift up the blankets at her knees. I then slid my arm in so I could reach in between her legs, I whispered her name again just to be sure. I then proceeded to slide my hand down the front of her panties and pajamas and felt her pussy, which was a little bit moist, and stuck my middle finger in about half an inch and beat my self off with the other hand, I then switched hands and took a little of my pre cum and put it in her again. After I cAme I went to sleep. I really want to do this again, Any tips?? Please don't tell me how horrible I am.