I find this idea intriguing. Although, I think I would be more interested in pre session chastity. A brief 10 minute visit to the Domme a day or two before a session where she locks you up and sends you on your way. As an alternative she could mail you the device (without keys of course) and supervise you putting it one via video call.

I love the excitement and anticipation the builds in the hours and days leading up to a session and I imagine being locked up would only increase those feelings.

I have little experience with this so a serious question....are there devices that are secure enough that there is no way to remove them without the keys (or that would not be able to be reinstalled) and yet relatively comfortable to wear for a day or two? (I'd assume steel rather than plastic?)