Princess for a day! - imaginary episode title card. When Twilight Sparkle accidentally casts a spell that switches ponies Cutie Marks and destinies, the only way to reverse the spell is by writing her own magic.
If dealing with being a Princess wasn't a challenging enough, she also has to play baby-sitter to a de-Alicorned Princess Celestia.
Tumblr Reblog - Just crazy enough to be believable!