I think fimagine could be done by impish spirits in the area who just want to mess with the person. It doesn’t have to be from a normal human, but it might play on the desires of the other person to get them both into trouble.
If I understand them correctly, they are the replacement for Destinies also right? I’m thinking of using one, but I’m a bit concerned about running into content restrictions in the descriptions. Is there a way to flag them?