I tried this with my wife and a friend. She was pretty drunk and very receptive.
She was on top of him and I was just rubbing my cock around her and him, and she said "put in it in..go ahead...see if we can do it" I had a little trouble at first because my friends dick is very big. But once I got some lube it went right in. I can;t tell you how good it felt. My friend came first, and with our dicks rubbing with all that cum an her juices, it was one of the best sexual feelings I can remember. If you do it let the other guy cum first, then enjoy the feeling. She went crazy with sexual pleasure, and was moaning and cooing, and pumping. We all laid back for a while, then my friend got her from behind again. After he shot his load in her again, I licked all that cum and pussy juice up...which drove her wild with visual pleasure at seeing me do this. Of all the bad luck, my friend moved away and married a woman that is not into anything like this.....Ahhhhhh! the memories!