I frequently fantasized over Carol's tits, my friend Joe's sister, before and during a jacking session. One Saturday when I was in the middle of beating off, Joe caught me.
When I was 13 and just comming for about six months, I frequently visualized the tits of a girl named Carol, the sister of my classmate Joe. Our families were close friends so their children often were included in the socializing of the families. At a pool party, given by Joe's family, I went into their cabana to change, and when I opened the door to the changing room, there stood Carol with her grape fruit sized tits sticking out. I excused myself and retreated with an instantly hard pecker. For the next six months, the remembrance of Carol's tits was the principal inspiration for my masturbation. Naturally, I tried to warm the cockles of Carol's pussy, so I began to visit as often as possible, especially on the weekends. On this Saturday, I arrived at their house, and found no one home except Joe, and he was up in a tree house overlooking the pool. He called down to me, telling me that he was the only one home, and asking me to come up. I did. When I cleared the entrance, there was Joe completely naked with his fist wrapped around his hard pecker slowly stroking it. I was surprised, but not shocked, since I played the upright organ rather well myself. He said, ' Come on, I know you jack off, get your peter out, and jackoff with me.' I hesitated, and asked him what would we do if his family came home and caught us. He said not to worry, that they went to visit his grandparents who lived several hours away, so they would be gone all day. He said that he didn't go with them because he wanted to jack off all day. I asked him what made him think I was into jacking. He replied, by saying come on, all boys jack off. Anyone looking at your prick would know that you are a serious jacker from its boiled look. So I stripped, and we began our first mutual jacking session.