I just had my first duo in April, and it was a complete fluke. There's an MPA that I've been seeing privately during the lockdown. I had appointment with her, but when I got there she said her drunk friend was there and couldn't drive home, is it ok if she hangs out? I said sure, and it turns out the friend was another MPA that I've also seen. She ran up and gave me a big hug and kiss, we all sat down and had a few more shots, and luckily I brought some extra cash with me (always be prepared), so next thing I know they're DFKing each other with my cock in between. I was worried I wouldn't be able to keep up, but everything turned out great.