I was 13 and my sister was 17, I would get on her nerves when my friends were staying over by us always trying to take a peek at her when she was in the bathroom by slowly opening the door while she was taking a shower, our bedrooms was separated by a bathroom that we shared, she got back at me one time when she had 3 of her girl friends over, she told them how me and friends would always try and peek in, so that night our parents had gone out to dinner and a show with some of their friends. I was already in bed when I heard the bathroom door close on my sister's side and the light came on and my door on my side didn't get shut all the way ( I found out that is how they planned it, knowing I would want to look) one of her friends was in there and was changing her clothes, my room was dark so I got alittle closer to see her, she had on just her undies and bra, being 13 and really looking hard, I didn't hear my sister and the other 2 sneak up behind me and grabbed me saying "caught you", the other one came out of the bathroom and turned on the light, I tried to get away but couldn't with all 4 of them hanging on, they got me on the floor and two of them was holding my arms down and my sister and the other one was sitting on my legs, one of them said " he wanted to look at us, lets look at him" My sister laughing said "might as well" that is when she grabbed my underpants and yanked them clear off. I hadn't reach puberty yet so I was hairless, while they were all looking at my penis, one said "oh wow, it is getting hard, my sister said she had an idea and told the other one to hold her leg and she ran in to the bathroom and came back with some lotion. She poured it all over my penis and started rubbing all over it, then the others took their turn with a free hand while still holding me down with the other, the whole thing was embarrassing, but it was really feeling good, my penis had never gotten that hard and big before, one of the girls said "wow, are you sure you are only 13? You are bigger than my boyfriend." They saw that I began to really squirm and my sister said I think he is going to come. Which I did and thought it was never going to quit coming. They let me up then to go wash off and my sister said that if I tell on her that she would tell mom and dad on something that she had promised she would never tell them on something that I did. Nothing was never said about that night except one of the girls said for me not to be to embarressed and don't be ashamed of what you got there, when you get older and start dating, that penis of yours is going to please a many of girls and even my sister agreed saying the last time she saw me naked I was like 8 and it was only tiny then, That made me feel good.