10 Years since she was released from her curse as Nightmare Moon. 10 Years since Twilight became the new Princess. Never have Luna thought she would actually become a mother. Even when Equestria was attacked by this species before.
If there are three things Principal Celestia can't stand, it's paperwork, princesses and her past. Unfortunately, the first makes up her job... and she desperately needs the second to help her resolve the last.
Everypony thinks that Celestia is called 'Sunbutt' because of her cutie mark. Only Luna knows the real story, though, and now she's going to share it with Twilight.