We got to talking about it a few nights ago and she says that she would REALLY like to have a three-way with another girl--and she was specific about the girl being a petite, hot blonde with nice t*** (she thinks SOOO much like me!)
It is really awkward if you go and pick a girl, because there will be trust issues, as a poster has pointed out.
The best way to do this is to get Amy to pick her up. This means you two must work as a team. This means that you must educate Amy in the art of PU.
You go to a bar together, preferably in the early evenings when there are lots of lone wolfs out.
Then you find some girl you both like, go up to her together and talk to her for a few minutes (run some game on her). Then you go away, and leave her and Amy talk.
After about 20 minutes, you come back and just spend time with both chicks. Number close on a high point. You must have some activity planned (like you are talking about food or art gallery or something and then get her number because you guys want to hang out as a three-some).
Essentially, gaming the third chick is like gaming one chick, but you let your chick do most of the work. You are just a facilitator in the interaction.
After you have number closed, have Amy call her up. Set up an outing for the three of you. Then have fun, have Amy up the kino during the "date". Let her see you and Amy kiss, and make out etc.
Take the chick to a danceclub. Have Amy dance with her. Have Amy dance sexual with her.
Back to your place. Preferably have wine, all three of you sit on a lounge with chick in the middle. You make out with Amy in front of chick. Have Amy make out with chick whilst you go to the bathroom or whatever.
Come back, and let Amy INVITE you in on the action. The male in a three-some CANNOT INITIATE.
Good luck.
