Being locked up by a pair of lesbians could lead to tricky complications. Like if the butch member of the couple got jealous that you were orally servicing her girl, she might take her anger out on you in all sorts of inventive ways. OUCH.
Actually most of the keyholders I write about are sweetly cruel, but they are cruel in a way that turns them on. They generally don't get mean out of jealousy or anger, they get mean because they CAN ... and that gets them wet.