In the summer of 1981 when I was 16, I stayed with my dad, his 2nd wife and my 12yo step-sister, Sarah, for two weeks. Since my dad and step-mom worked, they asked me to keep an eye on Sarah. That wasn’t hard at all since she had changed a LOT since the last time I saw her six months before. Even though she was 12, she had already started to develop a very nice body. Her mom had a terrific build with huge boobs so I wasn’t surprised that Sarah had started along that same road early. She also had the cutest smile that showed off her new braces.

I had known Sarah since she was 7 and we got along pretty good. We’d watch movies and swim in the pool most of the time. Watching her run around in a wet bikini was driving me crazy though. A few times she’d climb out on the ladder and the bikini bottoms would slide down giving me a nice look at the top half of her cute little ass before she’d quickly pull it back up. I had to put a towel over my lap a few times to hide a developing hard-on. It didn’t help that her white swimsuit was made of thin material and slightly see through. I could see her nipples and even her patch of dark pubes. She’d walk over to me to talk after climbing out and it was so difficult not staring right at her transparent bikini.

Then one day something amazing happened. She did a high bounce dive off the board and when she hit the water her bikini top popped off. She came to the surface all embarrassed with her arms around her boobs telling me not to look. I was so tempted but I turned around the other way. I heard her swim to her floating top and then she started getting upset saying her top was broken.