I've done this twice. The first time it was by accident of sorts and prob something that was later written about in a "Dear Hustler". I was at an all girls sleepover and I discovered that my 10 yr FB had also been with a few other ladies in attendance. In describing his skills to some of the other ladies somehow one of us "twisted his arm" to come over. Most of us were bi and we kept him VERY busy all night. There were 5 ladies and we ALL had a great time.
The 2nd was in the hobby. A gent picked and hired 3 ladies based on his preferences. None of us had met before and it turned out that I was the only bi lady present. It went as well as could be expected but the chemistry wasn't there between the ladies and it was a little awkward. I had a good time, though since I knew my tongue was going to be the only one tired the next day, I insisted that I got the bulk of what he had to offer

He reported the next day that it met his expectations so I assume we succeeded in fulfilling his fantasy.
My recommendation is choose ladies that have played before together, are bi, and have a natural chemistry. Perhaps start with one or two ladies that you like & trust and have her/them pick the remaining participants.