Our agreement is quite simple...
On the first day of her period, lockup begins. lockup lasts as long as she wants it to.
We generally don't have a ton of sex during her period, so we're thinking this is generally a good time to start, since I'll be spun up after a week of abstinence and she can benefit from frequent backrubs, baths, etc. She also has control over how long the lockup lasts. It could be short, or long - depending on how much she's enjoying it.
Each week she'll provide me with a list chores and housework I'm responsible for. No discussion. Surprises and going out of my way to please her are encouraged!
If she's my queen, she should be treated like one. My goal is to give her a holiday from the typical grind, giving her the opportunity to relax and get all of her needs met. I plan to arrange our date nights out, taking responsibility for laundry, dishes, bills, lunches, etc.
I'm not allowed to ask for sex or make suggestions. She owns the cadence and selection of sexual activities. Feedback can be provided when asked for.
We think this might be the best way to avoid topping from the bottom, or pressuring her for teases, etc. In the past some of our chastity play fizzled out because she felt like it was too much work for her. This puts her firmly in control, and gives her the opportunity to be pleased exactly how she wants as frequently as she wants.
That's essentially it. I have no idea whether lockup periods will last a week, two or more. I have no idea whether she'll get into it - but I do know I can do my best to give her an awesome experience and a break from the usual grind. As for me, being infatuated with her after 13 years of marriage is reward enough for me.

Any suggestions on how to make this successful, or idea for improvements? What worked for you?