If you don’t think you can stop, and you want to give her more control, consider a cage, as Natasha did, and give her the key. Many couples find this helps improve intimacy, as the husband becomes more attentive to the wife’s needs and pleasing her, or so I’ve read. My wife said no when I mentioned it. It also makes it near impossible for you to masterbate, especially if you opt for the full cage and not the wire one. You might also find you enjoy the denial.
Just my 2 cents, and I am in no way an expert on this. As has already been said, you may want to seek the advice of an expert.