Wife wants to fuck roommate [cucks perspective]

My wife wants me to ask my roommate if he wants to fuck. I’ve told my wife a year ago that I wanted to be a cuck and watch her with another man. We talked about it she sext with her ex and eventually got bored of that, and I always talked about my roommate’s long cock. She’s now asking how she wants to see it and fuck. My roommate is 2 years older and is a freaky guy. Also, I’m just not sure how he’ll react when I ask him if he wants to also or what he’ll say and how it can affect our relationship as roommates. I also want it to happen. I just want to know how I should approach this. I have shown my roommate her nudes before, and she loves the attention but is just as shy, of course. Any ideas what I should do or not do?I don’t wanna overthink it but at the same time I think it’s fine to do so?

What rules should I set as a couple?