I've done this with couples previously, as a Bull. I also was asked to bottom for the cuck, as the wife wanted to see her husband fuck another guy, and I gladly let him do me. Fucking another married couple has a certain mystical magic to it, something that never leaves you in terms of how special and exciting it was. Plus for any guys reading this who are insecure in having sex with another guy, doing it with a woman present breaks down those walls and legitimizes your actions. Make it a point to experience it before it's too late.