This thread went dead for a perfectly good reason, but I just thought I'd throw in an idea for something even a high-powered professional sub can do at work:

Any time s/he takes a coffee/tea/bathroom break, they have to do it in solitude (ie. away from their desk, in their office with the door locked, out in the far reaches of the parking lot, etc.) and spend the time thinking of you/the relationship. In addition to re-inforcing control, it should be good for their blood pressure (meditation time).

This was a GREAT thread, until its unfortunate ending. I learned a lot; thank you both.