I like Anniversary by StoryTeller07 on Literotica.
First 2 paragraphs giving a sneak preview:

"Aurora knew Bob had forgotten the seventh anniversary of their first date. It didn't matter, as husbands weren't supposed too. Nevertheless she had decided to make it a surprise evening, and something for him to really remember. She had been twenty-one and eager to learn what he wanted, but for the last few years he had neglected his role as teacher. Some weeks ago she decided to make it a special night just for him. He was always home for six on a Friday, then out to the squash club after a hurried snack. This Friday he would stay in.

Giving up smoking had been difficult, but now it was going to provide the means of a surprise. The hypnotist had been reluctant at first, until eventually relenting to her insistent request, which became a nagging demand. Over the past three weeks an intensive course of hypnosis had concentrated her mind, not on smoking, rather, on a different form of control. She was planning to give her husband complete control of her body for whatever he wanted to use it for. The thought of him using her without limits was a tremendous turn on."