A friend dancing

One night I went dancing with my girlfriend and some friends. At a certain point, a friend asked me to dance with her: tall, dark-haired, wearing a short dress and heels, very beautiful!
We started dancing, and she got closer and closer. I felt her "leaning" on my penis! I said, "Well, we're dancing, it's normal." Then, at the end, she brushed her hand against me. I think it might have been a coincidence, although it seemed to me like she was checking something out!
Later, while we were drinking, her friend came over and we started chatting about this and that. She calmly told me about her life. Since she hadn't said anything about the dance before, I was thinking I'd made a mistake about dancing when suddenly she squeezed my balls!
I don't know if she read my mind or what. Luckily, none of our friends saw us, especially my girlfriend. I immediately looked over, but she was looking the other way.
Someone in the club probably saw it; if they'd just touched me before, this time they grabbed it!!!
We didn't say anything else, just said goodbye at the end of the evening!