Celestia and Luna are about to leave Equestria for the afterlife, so they have to leave the kingdom to a new princess. Even though this new princess doesn't want them to leave, it has to be done.
They stay one extra day, but only to tell the ruler a story. A tragic, romantic, adventurous, and brilliant story. This story is known as "The Ballad"

Princess Celestia tires of constantly being surrounded by decorum, deference, and formality, and decides to take a day off from being Princess. But visiting Ponyville incognito is harder than she expects. Will she be able to fit in and make friends without blowing her cover?

After Nightmare Moon was purged from Luna's body, it left her completely and utterly weak. Struggling to perform even the most basic of spells, she has been spending a lot of time in her quarters trying to regain her strength, but recently she's been dealing with horrifying nightmares that assuage her night after night, each worst than the last.

After a particularly bad nightmare, Luna starts to lose hold of what is real and what is fake, and it is up to her caring and loving sister to help her through her ordeal.

Contains: Diapers

After an irritating encounter with Penny, Sheldon retires to his home-away-from-home, his Batcave, his Fortress of Solitude: his office. But the physicist gets more than he bargained for when a strange interdimensional worm hole appears in the Biology department.

Trapped in an unfamiliar, scientifically impossible world. Sheldon has the perfect opportunity to flex his astonishing social skills, or lack thereof. Completely oblivious that the fate of Equestria rests in his hands, Sheldon embarks on a journey of self discovery and love and tolerance... except he doesn't discover anything, and love and tolerance is a waste of time.

Well, maybe he'll learn the value of friendship along the way. But that isn't likely

Celestia is tired and worn out. Luckily, a new brand of beverage has hit the Equestrian market; Iron Bull, the drink that promises new energy and revitalization... but what effect will an energy drink for minotaurs have on an alicorn?

This is purely recreational writing. It's not meant to be taken seriously or offend anyone... lean back and enjoy the ride as I let my mind wander.

Warning: Involves capslock.

Celestia, as the castle knows, as Equestria knows, is dating Discord. They, occasionally have a small fling every once in a while, but it just turns awkward afterwards. All of it, because of Celestia's inability to do it properly. Now, with a self-help tape, she plans to solve that. Unfortunately, Discord finds it and decides, unknowingly what it is, to switch it with a guide on how to cook a turkey.
Hopefully she uses butter instead of oil, otherwise that would just be weird.

Princess Celestia, Princess Luna, and Princess Cadence end up in an argument.
Evidently, they clearly require the assistance of the finest in their respective guard regiments to act as their private bodyguards, couriers, and other such jobs that would be easily done by someone else.
Is there a bigger reason behind it?

After reading a story to his little sister, Princess Celestia's student Shining Armor believes that the legendary Mare in The Moon is about to return. After disregarding his warning, the princess sends her student to a small town called Ponyville to look over preparations for The Summer Sun Celebration. There, he, his sister Twilight Sparkle, and young dragon companion Spike, meet some strange mares and odd fillies. How will he survive a town full of crazy ponies? And what will he do when it turns out he was right?

The story is inspired by the Twiley chapter of Crisis of Infinite Twilights written by Defender2222.

Now the first in what I'm calling The Shiny-verse

When I was younger, Luna, and later Nightmare, told me that there were things that lurked in the darkness, within the spaces created by shadows that even they would be wary of facing at their full power. And that they would be terrified to fight then with so much of their magic locked away by the seal that the Elements of Harmony had placed upon them centuries ago. Old things... Powerful things... But we took comfort in that such things existed only in Equestria. But, as we learned on that night so close to Hallowe'en when I was ten, we were wrong...

So very, very wrong...

One of the doctors regenerations go awry as he wakes up to find himself not humanoid in appearance, but equine.