Hello SB. Kudos to you and your partner for exploring this together. As teddy said, I do love couples sessions and I do a lot of them. So if you are ever in Atlanta, look Me up. Here is a link to some of the work I have done with couples:

http://mistressayn.com/blog/tag/couples/

We have even had too couples come to FemDom Mansion:

https://femdommansion.com/pressing-candy-into-service-at-femdom-mansion/
https://femdommansion.com/a-subsub-couples-experience/

You should definitely do your research and have your wife talk with the perspective Domme. A chat with the female half is a requirement of Mine. It puts her at ease and helps Me establish her level of interest. If she has fun and feels empowered and sexy, you can't help but have fun too. I will also say that respect for the couple dynamic is imperative. I don't treat the male sub the same in a couple's session. It is a completely different dynamic than a solo session. Also note that some Dommes don't see couples. I have had many pros say they have encountered drama and find the situation to be more work than it is worth. I have seldom felt that way, but I think it has to do with My screening process. Hope this helps.