Half the Day is Night

Half the Day is a fan fiction written by "Augiedog" and can be found on Equestria Daily. It is a well-regarded tale of court intrigue and growth for Princess Luna and other characters.

Plot
A year and a quarter since Luna's return, the Princesses agree to give Luna full authority over both the night and day for one week as a show of faith on Celestia's part and to prove to the royal court that Luna is trustworthy. As a security measure, Luna asks the Elements of Harmony to become her advisors for the week to give her eyes and ears in the court and so that they'll be on hoof if Luna should turn into Nightmare Moon again.

A rogue group of nobles, opposed to Luna's reign, secretly orchestrates sabotage and attacks on Luna while she holds court, and the Mane 6 split up to investigate the plot and help Luna build up her public image, self esteem, and the Night Guard. Some romance between Rarity and a young courtier occurs along the way.