Some great stuff here: https://www.etsy.com/shop/LockedInChastity?ref=cart_shop_name_click&cart_id=2460633251
I assume you have solid sense of what his kinks are, If so then search some flr blogs and set up an evening fulfilling some of these fantasies. I can’t think of a better gift my wife could give me.
Also consider something you do together, or to him. A night all about him/doing to him would likely be considered very special. A commemorative gift marking the occasion would be thoughtful as well. Has he requested an activity that you haven’t done yet, or one he would like more of? It is very nice of you to think of him in this way!
My Mistress bought me this one. Have to wear it the upcoming Holidays. Don't know what happens afterwards.
You can never go wrong with panties! Maybe a cute bra/pantie set. Matching nightgowns for you and him. My wife surprised me with that one. She wears the 2 piece set (think male PJ's) and i wear the gown. Love it. It's very special and we bring it on our vacations. Sums up our WLM!! Couples massage. If he's wearing a belt it makes it even more special. We do that a few times a year.
Mistress gave me a portable TENS e-stim unit as a 'gift' that keeps on giving! She said that it cost less than $30 on ebay, but, from quite personal experience, I can tell you that She can drive me crazy with it attached to my clitty or using the butt plug to massage my prostate. What a wonderful gift it has been - except when She turns up the power!
There's something called The Original Accommodator latex, chin-strap, dildo. Does what is says on the tin it's about a five-inch, latex dildo with a strap that goes around the head and seats on the chin - leaves the mouth free. So allows oral worship and penetration as the same time. Great for Queening if that's your thing ?
My wife surprised me with a weekend away and a special tattoo. She often gave me cute panties or gift certificates to Victoria Secrets.
Piercings can be fun. I and a friend went while my ex got her nipples done. And I got my dydoe. I’d highly suggest piercings. She can get her nipples done or have him pierced. And if they don’t like them they can always remove them and the holes will heal up.