Hi, that tickles, and welcome to the forum. I have read your post. First, let me say that I have been here for 2 1-2 years, so I guess I'm an old hand around here as far as my forum membership. The people here, from the mods, to the chatters, and all the rest of the staff, are very ingratiating, and will put you at ease. We have a policy of acceptance here, and usually, even new people can get into the flow of things very smoothly. I was a quite apprehensive when I first joined this site, but after a couple of weeks, due to the chatters welcoming attitude, I felt like a part of the gang.
Now to your issue: You mentioned that you have been married for 12 years, and are searching for a way to tell your husband. Iam single, so maybe I'm not the best person to offer advice on the subject of how to tell a spouse. I can say, that I have had experience with having to tell ex girlfriends about a fetish, or "interest" as I like to call it, because I had the interest of female feet even before I joined TMF, I would say that gentle honesty is the best policy. Perhaps somehow bring the conversation around to the subject of tickling, or, if you have an instance where your husband tickles you, casually mention how you enjoy that, and try to build on it from there. As scary as telling a significant other about a fetish or interest is, it can serve to be beneficial, more so than to keep it bottled up inside. Try to introduce him to it slowly, and work on it together. Hopefully, in that way, you can build on it to the point where it can be enjoyable for both you and your husband.
I hope what I said helped. There are many others here who are currently in relationships who can undoubtedly build on what I said. Good Luck, and I hope it works out for you. I also hope we can chat at some point. Welcome to the site, and enjoy.
Mitch