Have you not thought about just hiring a male SP to join you both? Seems like it would be a lot less hassle all round. They turn up, are professional (hopefully), get paid and leave at the end. After a 3way, and once people have gotten over the line, there can be awkwardness. It's often good if they just get dressed and go, rather than want to hang back for chit chat, especially if it's your first time seeing them.
If it works out, either way, report back