Thanks for the input everyone! I may have spoken too soon though...
After much anticipation, she ended up standing us up. She was very vague on when/if she'd be willing to reschedule. So I guess the idea of a threesome is on hold for now.
I know hubby is bummed, and I'm bummed that he is bummed. I'd love to find someone else to do this with, but it's so hard to meet new people! We'd created a profile on FetLife a while back, but we never got any replies to our request for a single female looking to play.
We're not "bar people", and I honestly don't know where else to go to try to meet someone for this type of thing. Plus I worry about STDs and that type of thing with a random hook up, so I'm not sure when or if this fantasy will ever become a reality.