The Rules of Dark Fairy Tales

Dark Fairy Tale Dungeons!!!!!! Please, I’m Begging (Crawls Around in a Twisted Manner)

Looking for Stories About Transmigrating Into Fairy Tales, Like Becoming Cinderella's Stepmother

The protagonist transmigrates into the stepmother of Cinderella or Snow White, and their mission is to help the prince and princess live happily ever after, that sort of thing. There's also a transmigrator into a book who becomes the villainous male lead and opposes the heroine, but they eventually get together. Then they return to their own world and start dating there, too.

Any Dark Role-Playing Stories?

Something like Fate Player.

Looking for Twisted Fairy Tales, Preferably Quick Transmigration

I remember reading a book where the male lead was a princess who disguised himself as a woman, and the female lead was a little elf. I'm looking for similar dark fairy tales, or hoping someone can help me find the original book (′へ`, )