It depends on what you're planning on doing. If you're just going to giving oral then your size doesn't matter at all. For double vaginal it may or may not work well. It depends on how big she is. If she's a size queen, and probably most women in this lifestyle are, then probably it's too small, unless she gets off on the humiliation aspect of it. Maybe she doesn't want anything too big in her ass. It all depends on the other two participants.