A younger Celestia has a small, unseen exchange with her lover Discord while walking through Ponyville. Her mother Queen Galaxia and sister Luna disapprove of him, oblivious of their relationship, breaking her heart.

Pretty short Dislestia one-shot. Takes place in the past long before MLP:FiM and includes Queen Galaxia as an interpretation of Celestia and Luna's mother when they were younger.

I like to think that there was a greater amount of draconequii in the past who owned their own share of Equestria. The pony races and the draconequus kingdom would often disagree and be at war with each other,
considering they represented harmony and chaos.

Celestia and Luna's parents were very particular about keeping their daughters safe, and Discord's father, who was the leader of the army of draconequii, hated seeing him interacting with other species in fear that Discord would want to become good.