Blimey, hope this works out for you
The section of "The Game" about this? I can't remember the page but it was around the bit about two of them wheening themselves off sleep.
He accidentally had both girls around (one showed up un-announced). He invited them back to his room and got them to do massage the girl who was most uncomfortable first.
The massage was called something like the 100 hand massage. He and the more comfortable girl massaged the other in circular motions (meant to feel like 100s of hands). Then, the girls swapped. Then, he got a massage and (by his account) the girls were turned on enough to just start making out by themselves.
The major point he tried to make about this was that it had to be the girls' fantasy not yours. Mystery still hadn't managed it because he was trying to force them to fulfil his fantasy!
I must be a perv, I read that (at least) a year ago...
Hope this helps!