A few years after Luna's return it seems that Equestria will finally know an era of peace and appears to be on the verge of a new renaissance. Ponies are happy. Luna is recovering. Celestia is miserable.
Personally, Celestia has had few surprises — oh, there were a few: the unexpected return of her dear sister, Discord, the Crystal Empire's, and Tirek's escape. But most things, she finds, are nice and calculated... until now.
Little Sparkler always loved her father. He cheered her up, played games, and even helped mommy smile. Life was never boring, thanks to Daddy. Sparkler was always proud to call herself his daughter... Until the first day of school.
Some knowledge is best kept buried, while most often then not the best part of living life is the mere fact that it should never be dragged on for centuries to come, which became the curse of Spike and Twilight Sparkle's.