I caught my girlfriend getting a massage in our hot tub
My girlfriend is good friends with one of her male co-workers. He is an attractive man and I have always been somewhat jealous of him. I came home from work one day and found my girlfriend getting a massage in our hot tub by him. She was sitting in front of him and he was massaging her back and shoulders. When they saw me they just said hello as if nothing was wrong so I did the same. I told them I was going to make something to eat and they said ok and continued with the massage. After they were finished they got out of the hot tub and I noticed my girlfriend had on a thong bikini and her friend clearly had an erection. Her co-worker gave her a hug and a kiss on the cheek and I saw him press his erection into her stomach. Even though I know she is in the wrong here for wearing a thong and getting massaged by him I couldn't help but get turned on by it. I don't know what to do.