My girlfriend and I are both 20 and have been together for about a year. Last week her parents were away on vacation and I went over to visit her unexpectedly after I got off work. I knew she’d be home and figured we could also have some hot sex after as I was getting tired of car sex.

She has this one guy friend of hers from high school who she still hangs out with occasionally. He is a nice guy and I have met him several times. He lives pretty close to her and they go on runs together. They were on the cross country team in high school. She has told me that day when I asked her what she was doing that she was going on a run with him and then was going to be home the rest of the day. I get to her house around 3 pm and let myself in. I go upstairs and hear the shower running and figure she had finished up the run and was cleaning up. I planned on joining her but when I got closer I heard talking and a male voice. I looked in the bathroom and her parents have a large shower with a glass door so you can see everything.

My girlfriend and the guy are of course naked in the shower and she is standing behind him stroking his erect dick. He is reaching around and rubbing her ass while she strokes him. He was telling her how good it felt and how much he needed to cum. He doesn’t have a gf or anything and she told me he was shy and didn’t have much luck with women. Well clearly he did with her.

Anyway she just stroked him and rubbed his balls for a few minutes until he shot a big load all over the shower wall. He thanked her and she laughed and asked him if he felt better. He said yes and she smacked his ass before getting out to dry off.

I left and didn’t go back until the next day when I confronted her about what I saw. Her response surprised me and she basically told me that she would occasionally give him handjobs and has been doing it for several years. She said they never did anything more and that he would touch her body but he never fingered her and she never gave him oral. It was just for him to get off and they do it in the shower after they run sometimes.