Wow - thanks SC - your response helped quite a bit.
My wife made it clear that she is not interested in a group sex hookup and that she was strictly there to meet friend. Friend replied back that No, group sex is not on the table and H&GF would be spending time together. Perhaps hubby is there in case things go badly for F and she needs to "retreat" or something, idk.
I'm going to just let it be and see what happens. I trust my wife to be smart because she is
As I said in another post - I trust my wife and she's a very sensible and practical person. She won't let anything happen she doesn't intend.