I kind of want to write a remake of the Sleeping Beauty folktale where the evil fairy met Beauty again as a young woman and fell in love without realizing that was the baby she'd cursed. She only realizes it when she tries to make Beauty immortal and can only manage to alter the curse's form. This is something she does at Beauty's request because the princess feels the same for her, though the fairy never tells Beauty that she was the one to originally curse her.
One ending idea is that Beauty finds that out after the prince wakes her, and is heartbroken enough that she tells the prince her lover's weakness. He uses the knowledge to kill the fairy, and he and Beauty marry. She commits suicide not ten years later, having given him no children.
The other ending (that I like better) is that the fairy and Beauty plan to have someone break the curse, because once its broken the fairy can then make Beauty immortal. The fairy takes the guise of Beauty long enough to make him fall in love with her, because his love's all the curse needs, and lets him find her sleeping. Afterward the fairy bewitches him to never speak nor look for Beauty again and vanishes with her lover to what's now their castle.
I wish I could say the idea was entirely original, but no. It was inspired by
this.