Celestia has become emotionally withdrawn and disconnected from her little ponies. The imprisonment of Luna compounded with the constant loss of any who got close to her, she has forgotten how to connect with another pony. Until a small, injured filly who is equally distant after the loss of her parents stumbles into Celestia's life. Now, both ponies will help the other heal and rediscover once more what it truly means to be a pony.

A 'Mommylestia' story, the concept of which has been in my head for some months. I will be sticking rather close to canon for events, the major differences are that Twilight's parents are dead, and Shining Armor is a few years older and already dating Cadance at the time of this incident. I plan to keep mostly everything else the same.

This is a fic based on the Time Loop Files, the format of which was first codified by Innortal on fanfiction.net.
Here's a brief guide.
The basic idea is, one character (the Anchor, usually the main character of a fictional setting) is looping back to the very first moments of their parent series every time either they die or some kind of time limit expires. They of course end up monumentally stir crazy given enough time.
Eventually others start to loop as well.
The reset is not always perfect. Sometimes a loop's history will be different to the "prime" loop, or canonical plot.
"Crossover" or "Fusion" loops also occur, randomly. These can involve the home loopers having a guest, or the anchor for one universe spending time in another, or replacements of one character by another.
Vacation Loops are where the Anchor (or others) decide/s "buck it" and lets off steam by doing whatever comes to mind. There's little or no attempt to maintain the original timeline.

In addition, and particularly more recently, it should be known that this story has a collaborative element to it - people may submit loop ideas or loops, ideally at the Spacebattles thread (a link to the current version of which is on the Trope page), and they may become included.

There's two page image options, thanks to Filraen - the current page image has been edited by the original creator from this work of theirs.. The other one is here:
http://hourglass-vectors.deviantart.com/art/MLP-Loops-466030169

Orphaned from birth, with only the memories of a soft touch and gentle voice to remember her by, Twilight yearns for her mother. What pony wouldn't want to know why they were abandoned, why they were left to be found by the Princess of the Sun herself.

That was nearly two decades ago though. Twilight was older now, and hopefully wiser. She is happy with her two best friends, Cadance and Shining Armor. They are like family to her, the brother and sister she never could have. Though dreams still haunt the young mare, dreams of lullabies and tender kisses, she has moved on.

The personal servant to the Princess of Helios, the land of the Sun, Twilight enjoyed both rank, and knowledge. But it also means that when Princess Luna comes to visit her old friend, Twilight is given the task of tending her. The Princess has come in search of marriage, at the behest of her ruling Council. They demand an heir to ward off the potentially catastrophic attacks of the neighboring dragons.

Soon, Twilight will be tested and tried. She will be given the a choice between the life she has known, and the duty she is sworn to. But never, not once, will she forget.

For who can stop loving their mother.

AU. Based on the first season. Twilight and Celestia begin to drift apart due to a misunderstanding. Will Luna speak up and repair the breach, or will she remain silent to keep her new friend, Twilight, all to herself? What other challenges will face everypony involved because of this new relationship?

It's a simple little love story. Unfortunately, love's not simple.

Twilight gets a distressing letter from Celestia and rushes to Canterlot.
What happened to the princess? What is Luna up to? Why do I sound like the narrator to a bad crime drama?
The first chapter is inspired by a drawing from JohnJoseco. The rest will be my own madness doing its part.

For almost a thousand years, the immortal Nightmare Moon has reigned over Equestria as Empress. To the average pony, Nightmare Moon is an overarching enigma whose rule is absolute and whose wrath is terrible. But to Twilight Sparkle, who as an orphan has never known her parents, the Empress is something else entirely. When the young unicorn is brought under the royal wing as an apprentice, she learns a great deal more about the supposed tyrant than she ever knew. But as Twilight is introduced to life with her new mentor, she is thrust into a world of political intrigue, conspiracies and secrets. Secrets that were never meant to be revealed. As allies and enemies plot against the very peace of the nation, will Twilight fall prey to the perils of her new position? Or will she prosper and find in Nightmare Moon the mother she never had?

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My eternal gratitude to my editor, LordOfTheWrongs, without whom Night's Favoured Child would not be the story it is today.

Now with added TVtropes!