So I had just started dating my girlfriend, we were maybe 3 months in. Went to Vegas for a friends birthday with a big group. One of the girls is a friend of a friend, grew up kinda sheltered, and now has lost weight, got lots of plastic surgery done, and is fun. She is super tall, and not normally my type. We were all drunk after bar hopping for a while, and we were trying to get my friend off the dance floor because we were leaving. She started dancing with me and my girlfriend, and then we all three started making out. It was so hot to see my girlfriend with another girl. I wanted it to continue, but by the time we got back to the hotel the mood was over. I’m hoping to bring her in to our bedroom at some point.