How do you talk to your wife about longing for a dominatrix?

II am 51 years old and have been married to my wife since 1993. There were a lot of ups and some downs, but we’re happy. “Standard program” is on in bed, which is fun, but I was missing something. For a long time I’ve had the desire to try SM. The only problem was to find the right mistress. The dominatrixes I found on the internet looked like a mix between my mom and my grandma. Or I have to drive all over Germany to meet possible women. Both were bad assumptions. In the summer of last year I met a young, very pretty mistress. I was immediately overwhelmed by her charisma. During the vacation that followed, I had enough time to think about whether it should remain a fantasy – or should I try it out? Curiosity won out, I wrote to the lady.