I was skinny dipping in the swimming pool when Bunnie (my son's new girlfriend) came over. She was a little embarrassed and offered to come back later but I invited her in. She'd never gone skinny dipping before and I told her "it feels so good on the naked body, you should try it". The next thing I know, she's complimenting my breasts and I'm complimenting her youthful body. We ended up fucking right then and there, it was so naughty. I hope my son doesn't find out!