I'd ask her if she was into it, and if the attire truly suggested some submissive traits in her. If the answer is yes, I'd tell her to suck me hard first, while I gently fondle those lovely little titties. My wife and I do everything together, so I'd get my wife to stroke my cock into your wife's mouth, until your wife feels ready for the last few inches. Then I'd lay your wife back, while my wife strokes her hair, spread her legs a little wider, and position myself at her pussy's entrance. My wife then slides a condom on me and we begin in earnest.