Every dress Luna owns is a gift she had no say in. Every dress Luna owns was given to her by Celestia. Every time Celestia gives one is a way she tries to understand her sister.
Sisters are supposed share everything. Secrets, experiences, feelings, knowing silences... but sometimes first a silence must be broken for sisters to truly understand one another.
Celestia has many titles and duties and there are always things that remind her of this. They could be ponies or objects, perhaps even something more abstract and symbolic. Today is one such reminder of one of her lesser known roles.
One thousand years ago Princess Celestia was forced to banish her sister to the moon. What she didn't know was that Luna had been hiding something very important to her. Now Luna is home but is it to late for her to take the role she always want
It is Celestia’s birthday, but instead of getting a whole cake like last year, Luna only brings her a single slice, saying that she won’t allow her anywhere near the rest. What other course is there but to declare war?