In a fantasy, everything is perfect and everybody does exactly what the fantasizer wants them to do. In reality, when you get four different people together, they have four different agendas, four different ideas about exactly how the fantasy should be lived out. So fantasies involving more than two people are very difficult if not impossible to make come true. Then you'd have to find out exactly what your wife expects everyone to do, and while you're enjoying watching, you'd have to make sure they're all doing their job. I wonder if you've really thought this thing through.
Some fantasies are best if they're left to the imagination.
Dear Dr. Tracy, I have recently broken up with the love of my life whom I had a relationship with for 8 years. Actually I still love him. Friends who run into him, tell me that he doesn't seem very happy, however he has moved on with his life and has moved very fast at that. As a matter of fact he has a girlfriend already, and rumor has it that they are moving in together. I can't stand the thought of it.