I’d think of it as “I tell a story to my sister about something that happened in class. Who does she tell and how does it change based in her (or my) relationship with them? For example, she tells our mom. How would she embellish it and would she make me the hero, sympathetic character, villain? How does it change again when our mom tells someone else?” Except change the point of view to the story itself.
I was thinking of doing something like this with a prophecy. I still might, later. The main question I think I would need to address is what the story’s relationship would be to a spin-off of it: all the different versions of Cinderella, for example.
I hope you figure it out because I want to try it when you’re ready to share.