Only allowed to listen to her and him

Find a place to hide (closets work well). Your wife can tell him you're out. That way he can feel comfortable fucking your wife while she can be vocal for your sake. It's a huge turn on for my Wife knowing I'm watching. Plus She can humiliate you by praising her lover and comparing him to you. I don't know if offense is your thing, but it's a huge turn on for me. Good luck!

It's the hottest thing for the wife to spend the night sharing her bed with her lover after they've fucked, literally relaxing with him. Becky has done that to me.