We all know of how Princess Luna fell victim to Nightmare Moon's influence. We all know of how she returned and how she was saved by the powers of the Elements of Harmony, and how her sister Celestia was overjoyed that after a thousand years her sister had finally returned to her. The question is though, why did Celestia allow her beloved sister to be forgotten by her subjects?
This is the version of the story where that never happened. This is the story where in her grief, Celestia never let her ponies forget the princess they drove to darkness with their and her own neglect. Where she made sure that everypony remembered the day that they lost their guardian of the night. How would the story have panned out with this setup?
(This story is actually inspired by the story The Return of Princess Nightmare Moon by Aegis Shield. This is by no means a copy though. The story just got me thinking about the fact that Celestia really did in a way let ponies forget their was ever a Princess of the Night or that she was her sister. Hope you all enjoy.)