How about a criminal patient that is being transported and requires a straight jacket and restraints? Although I don't think as the patient you require any enjoyment out of the deal. The EMT can take advantage of the patient, after all, who is going to believe the criminal that she has been...
Consider this...
Mepsipax187,
Have you heard of TimeLock? Here is the site http://timelock.rules.it/. Basically you can get a key box of some kind, and use TimeLock to control your access to that keybox. There are many options to customize your experience.
We've used this for Chastity...