I was out drinking with a few guy friends, revisiting my hometown. We had walked back to a bar and all had a nice piss off a bridge into a river together and we get back to my friends place and go for a swim in his pool. None of us brought bathing suits and we were all swimming in our boxers, eventually we realized it was 3am and we turned the lights off and dropped the boxers. We were having a great time and eventually were chatting about sex stuff and I brought up my piss kink. A couple m