From my (male) perspective, what gets me off is seeing my wife get off.
If she wanted me to stand naked in the middle of a freeway, and I could be assured she would have a once-in-a-lifetime orgasm...well, I'd ask for alternative methods first LOL but you get the idea.
So, I guess if the incentive is that he can create a mind-blowing orgasm for you, maybe offer that first. I know it sounds a little mechanical the way I am saying it here, but every man wants to be the reason his woman is having Richter-scale orgasms.
I have always asked for direction from my partners. Once that is established (that I want direction) it comes thick and fast...(did I just make a pun?)
Let him know that's the way to your satisfaction - make it just the tiniest bit of a challenge, if you are as intimate as you indicate, he'll step up.
Also, start with fewer toys, less formal or scripted scenes...watch his reactions and see what he seems to like.
and you have to remember, intimacy is about putting yourself out there, and your partner has to trust you and be worthy of your trust as well. it's NOT an easy thing you are doing...brave at the very least.
you could also ask for a couple of other modifications of his behavior, ("honey, I want you to take the trash out every week, I don't feel that is something I should have to do...")
work it into a list of the changes you'd like him to make.
Honey, I want you to rake the leaves, fill my car with gas and have it washed, get yourself a couple of new shirts, and oh, yeah, one more thing, I'd like you to pretend you are a doctor and examine me, like we were kids...the thing is if you do, you are liable to be in for some of the best sex of your life...
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what doctorbrian said.