Tirek's defeat would've come so much easier if Celestia chose someone other than Discord initially.

Luna finds out two of Celestia's best-kept secrets, both involving her.

Ultra's collection of written (possibly with shipping) collab oneshots

Since Equestria no longer needs their princesses, some of them have found new roles, others are just starting their new journey.

Smut! No, really. Celestia and Twilight share some loving, tender moments with each other.

Late one night, Twilight has finished her latest spell. Nothing could go wrong testing it once to make sure it's stable, right?

Cadance has a nightmare.

The Elements of Harmony can do no harm. Gravity has no such qualms.

Some batponies get scheming on how to cheer up their Princess of the Night.

Celestia and Luna go on an unexpected adventure after a drinking contest gone awry. Let’s follow them, and see what kind of trouble and adventure our drunken princesses can manage to find!

With a recent surge of Nightmares in the Realm of Dreams, Discord is tasked with helping Luna and Nightmare with their roles in keeping the Realm and its occupants stable.

Even those with supposedly limitless patience do find their limit. Celestia reaches her's with Discord when he sides with Tirek.