On the day before her 800th year of her lonely reign without her younger sister, Celestia takes the day before to mourn over her sister ever since she was banished to the moon. But on this particular day of grief, she gets a visit from the Doctor, along with somepony whom she hasn't seen in a very, very long time, her sister Luna.

Any kind of constructive criticism is welcomed. (The key word here is "constructive".)

A special thank you to SecretBrony01 for proofreading this story.