Copper

Classic Cinderella is always great, sweet little girl from a dysfunctional family falls in love with the handsome prince during a ball, which she attends thanks to her fairy godmother. At the stroke of midnight she has to leave, and leaves a shoe behind.
Cute, yes, but even cuter when little Cinderella is instead the infamous dragon hunter Dean Winchester, and Castiel is the prince and head mage
And Crowley is the fairy godmother.