I really like what you've posted so far, it seems that you are definitely cognizant of your situation.

I don't think you need 24/7. If he's not happy with it, that's fine. It only seems like a way to pass full responsibility onto you, besides the whole sexual attraction to the idea. What I offer as a counter to entirely upsetting him in this regard is to provide a similar "opening a present" situation to him, in which he will never want to step over the line and reach full satiation. I don't really know what to suggest since you clearly know better than me, but do remember the role of a proper dominant is to leave the submissive wanting.

Best of luck!