permanent chastity device

A chastity_device that has been rendered non-removable in some way.

For the sake of tagging, chastity can be considered permanent if at least one of these three things is true:
1. The permanence of chastity is mentioned through dialogue
2. A key is either visibly destroyed, or in the process of being destroyed
3. The device itself is visibly unremovable. For example, a keyhole is sealed.