Confinement by Dutch Mistress Kate The Hague:

A fantasy for many, and I might just help it come true for you. Locked in a cage, blindfolded and abandoned?

You will lose all track of time and will be left to your own devices, without others to distract you.

Or maybe you'll be locked up in public instead, so everyone present can see you standing there because I wish it. Perhaps they'll comment on your situation.