A little bit after my girlfriend turned 20 we went to see her friend in college. We did some stuff during the day and her friend wanted to go to a party at night and she convinced my girlfriend to go so I went with them. We got there went and grabbed drinks and were dancing some. I had to go to the bathroom so I went and left my girlfriend with her friend and when I got back to both of them they were both being grinded on and having their body’s felt up. I just stood back and watched in shock for a little bit but after a while I got turned on from her being felt up by another guy. After a while of watching he even went and put his hand in my girlfriends pants and started rubbing her pussy and fingering her. After he was doing that for a while I stepped in and stopped it but idk why I was so turned on from it. Later she told me her friend convinced her to grind on another guy and she said she really enjoyed it. She recently told me she wants to visit her more this year