Congratulations!
I just came out to my wife of 15 years just a few days ago. It was the scariest thing I ever did in my life, and I have done a lot of scary things. I have not indulged my DL side since I was a teen. "What am I supposed to be doing with this knowledge?" she asked me at one point. I reassured her that I wasn't necessarily interested in exposing her to this, but I didn't want to have to worry about hiding it either. There is something extremely liberating about finally being able to part with my last embarrassing secret.
And speaking of liberation, I no longer have to completely deny or suppress my DL. I'm looking forward to a box from Fetware to arrive next week!
I don't expect my wife to ever understand, and I'm not sure anybody who doesn't have this fetish can (Dan Savage has referred to anything DL related as "The world's loneliest fetish" and "A fetish too far"). So long as I respect her boundaries, she is more than willing to allow me to be what I am. That's a side of her I don't think I would trade for a DL friendly partner.