It happened up at the family cottage of all places. I met him when I was swimming in the lake. He was as good a swimmer as I was and we began talking when we decided to dry off on the beach. The conversation turned to sex as it always does between guys. He was wearing a skimpy bathing suit and I was wearing cut off jeans. I noticed his bulge expanding as we continued chatting. Suddenly, my dick twitches and starts expanding.