When i was in high school my older sister had a close friend that spend a lot of time at our house with her. I would always spy on them when ever i could. My parents were out for the evening and they were in my sisters room getting ready to go out. I had put a concrete block under her window so i could peek thru her blinds. It was pretty easy to see in if it was dark outside. Anyway I'm on the block looking in her bathroom window and they are both naked standing in front of the mirrow. They are pushing there tits up and i guess comparing sizes. My sisters were smaller but sort of puffy. My sister starts rubbing and pulling on Lori's nipples to make them stick out more. Then Lori plays with my sisters. My dick is like rock hard and i'm trying to pull it out of my shorts and stand on the block. I fall off and hit against the house. I have to hide when i see them comming toward the window. I go back in the house still hard as ever. I go into my bedroom take off my shorts and underware and lay on my bed to masturbate. About that time my door pops open and in walks my sister with a towel wrapped around her. I sort of freak out and she says I know you were peeking at us and I'm telling Mom and she walks out. I didn't have time to cover up but stopped jacking and put my clothes back on. In a few minutes her and Lori come back in my room and tell me that they will not tell on me if they can watch me masturbate. I was freaked out and didn't know what to do. I had already lost my erection. I know my sister and Mom are pretty close so I really don't doubt that she might tell. Later when I thought about it I don't think I would have got in that much trouble. I was a pretty good teen growning up. At first I resist and my sister tells me I can just let Lori watch and she will leave. Lori is like no way we are in this together. The two of them are whispering and giggling like girls do. I think Lori was trying to get my sister to tell me what to do and my sister was trying to get Lori to do it. My sister says Lori wants you to take your shorts off. I'm still not hard but I am getting more relaxed so I take them off. I still had on my underware. They both look down and my sister says you have peed in your pants. It wasn't pee. It was precum from earlier. My underware were totally slippery with my precum. I was sitting on my bed and they were standing. They keep whispering and Lori says now t he underware. My dick was starting to get semi so I wasn't as embarrassed as I would have been if I was totally soft because my dick was not that large at the time. I test them and say I wlll take off my underware if you will take off your tops. My sister looks at Lori and tells her to take off her top. She was like not unless you do. So we decide to all take them off at the same time. Lori takes off her top and she has on a bra, i'm totally naked and them my sister takes hers off. She doesn't have on a bra. I had seen her tits several times but never this close up. My sister unhooked Lori's bra and she took it off. Lori had great tits bigger than any girls i had played with . My sisters were small but her entire nipple and aerola puffed out. I thought that looked hot. I wanted to just reach out and touch them. I think I almost forgot that I was naked. They are looking at my dick and i realize that it is getting erect. I didn't know what sort of expereince the two of them had at that point. I think they were intrigued. Lori says ok masturbate. I tell them to get naked too but they both say no. I don't push the issue and I move up in my bed and sit up against the headboard. They both sit on my bed Lori closest to me and just watch.
