Our New Friend

I am 21 year old and I get really aroused by the fantasy of my boyfriend having sex with another girl. The girl doesn't know us. We met her on the street while we were on vacation...

While they pleasure each other, I enjoy watching them. When they're both really aroused by each other, I decide to enjoy myself with them. I want to get involved. Mostly, I want to have sex with the new girl. Sometimes I switch to my boyfriend and have sex with him, but being there between them is the key.