Hmm. I am thinking of playing a single guy, not very experienced with BDSM, perhaps a friend of one of the women. She could be married to someone else and brought along as a fifth wheel, or as the "date" to a single woman who just needed to find a partner to bring to the group. Hell, since I know there are a couple of fellow incest fans here, I'd be willing to go with a cousin/brother to one of the women instead.
Let me know if interested.