candaulism
A fetish where one derives sexual pleasure in exposing an unwitting character to consenting parties in a manner which is lewd or provocative. There should be enough context to gauge that the unwitting character is being or will be exposed to character's other than the one exposing them.
The term is in reference to one King Candaules who, in the story, ployed to have his nude wife unwittingly exposed to his servant.
The term has seen use in more broad terms in its real-world usage, however, here assisted_exposure can be used as a catch-all in cases where a character exposes another and forced_exposure can be used when a character does so forcefully.