There is nothing wrong with how you feel and fantasize about. Fantasies are part of sexuality and create intimacy between you and your wife. This can stay a fantasy to add spice to your sex life or you can both decide to go further and make it a reality. Either way, in my experience, you both win!!! First, your level of intimacy increases dramatically and you may find out that your wife has some fantasies of your own that may blow your mind!!! Second, you will both feel renewed not only in the bedroom but your relationship will be much stronger and stable than any other time in your life. Being open with your partner and exploring your desires together is the way all marriages should be. This is the person you chose to share the rest of your life with. ENJOY EACH OTHER IN EVERY WAY YOU CAN!!!
My wife and I have an incredible relationship that is stronger Superman on steroids!! We chose to go through with it and have enjoyed so many experiences together and it always is at least fun and always gives us something to talk about and laugh about at times. We have only been involved in the lifestyle for a year and a half but have had many experiences. She has a dom, who she adores and is a machine with her, its incredible watching them together. Yes, I have been in person watching her get fucked, which in my opinion is the best, and I have videoed her many time with different men and have a very nice library of footage. I have not watched porn since we started!!! No reason to because watching my wife is SO MUCH BETTER!!!
I wish both of you luck and just remember to communicate with her and if you decide to go through with it, always keep communication a center of your rules of play.