chastity key
A key to a chastity cage or chastity belt, sometimes worn as a key necklace by the dominant party called the keyholder. This is usually any key in the same post as a chastity device but can also be a key in a series of posts or if it's implied a character with the key is a keyholder for a character in chastity.
Examples
Related tags
This tag implicates key (learn more).
