When Pinkie Pie's birthday surprise results in the destruction of Princess Celestia's cake, she finds herself in big trouble.

But she's not actually supposed to enjoy being in big trouble though, is she? Because she is. She's enjoying it a lot!

Written initially as a fast-time, prompt-based challenge, and tidied up (a little) for publication here. So thanks to All Art Is Quite Useless and Not Enough Coffee for leading me hopelessly astray. This is your reward.