Hate to give you this answer, but "it depends." What do you bring (emotions, feelings, expectations) to LM sessions with your W? what is she "into" when it comes to fantasy and things that you've never done together?
Real life doesn't measure up to fantasy, and I don't think that any of us should expect it to. If you start a LM session with a poor attitude (as I did last week when my W initiated and I just wasn't into it), it will be lackluster and (perhaps) unsatisfying. If you start a LM session with a "can do and do and do" attitude (as I did last night), things turn out nicely. Even though we didn't do anything kinky/fantasy-like, I was really satisfied.