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

For years, Twilight Sparkle and Queen Chrysalis have been at each other's throats. Both have experienced victory over the other, and both have experienced defeat. Out of all the creatures in Equestria, none despise each other the way the pony Princess and changeling Queen do. They seemed destined to remain locked in battle forever, or at least until one is finally dead at the hooves of the other. The cruel insults, the vicious loathing, and the powerful spells that have passed back and forth between them at each meeting have become the stuff of legend.

Imagine Twilight's surprise when she finds out changelings consider this dating.

And now they're married.

***

Sequel: Pony Courtship Rituals

***

Some beautiful fanart of the end of chapter three was done by Dmann892; you can see it here.

More awesome fanart, this time from chapter one.

Now with a TvTropes page (obligatory TvTropes warning goes here).

If you want a Russian translation, you can find it here.

There is now a reading of the story on Youtube, which starts here.

This story is a sequel to NOW YOU BUCKED UP.

When a new, strange kingdom of magic is discovered to the far west of Equestria, the Royal Sisters take an entourage and investigate. Which nearly sparks ANOTHER international incident.

Once again, they don't bring Twilight. And ONCE AGAIN, she's left to clean up the mess. Which involves yet another very long letter.

Twilight Sparkle gathers her friends after receiving a rather distressing letter from her mentor, Princess Celestia. She's not happy about the contents, at all.

It seems her friends all went on some magical adventure without her. And now they're all in a lot of trouble.

Sex tag and Teen rating for some crude humor.

Months after Chrysalis's attack on Canterlot, Twilight and her friends are turned into changelings. And not just any changelings. Royal changelings. Royal changelings who've now inherited what's left of Chrysalis's swarm.

The cover was suggested by a friend and was made by 0ravensrequiem0

Rarity’s little Temptation ends up on pins and needles. Literally.

With her shoulder-devil out of commission, other Temptations pop into her life to pick up the slack from their fallen sister.

-~-~-~-~-~

Written for the Barcast's "Make Rarity Not Garbage" contest.

Cover art by JennDyLyon. Adore her. Fear Her. Admire her art!

Pre-read by ScarletWeather and Aragon.

When Starlight Glimmer tricked Twilight Sparkle into freezing a filly Rainbow Dash in crystal, the sonic rainboom was prevented. This sent a wave of chaos through the timesteam as destiny unraveled, and empowered Discord. He is quite curious as to who exactly was evil enough to cast a potentially lethal spell at a filly.

This story is a sequel to Seven of Six: A Screaming Butterfly

Twilight Sparkle is a unicorn prodigy, her special talent of magic allowing her to wield all manner of the arcane arts with ease. She is an SGU graduate, has connections with the Royal Guard, knows Princess Celestia, and is a mother to a juvenile dragon.

She's also apprenticed to Discord, Lord of Chaos and Disharmony.

And he has a mission for her. A fallen alicorn named Nightmare Moon will soon return to bring eternal night and assured death to all the world. It's up to her to retrieve the Elements of Harmony and stop her.

Join her as she explores a familiar town, befriends familiar ponies, and completes a quest that's as old as the fandom itself, but with a twist.

A retelling of the pilot episode Friendship is Magic, but set in one of Starlight's alternate timelines.

True friends do everything together, but the night after Princess Twilight’s coronation, the bearers of the Elements of Harmony decided one of those things would be to go out clubbing.

It was a particularly bad idea.

Eleven months later, they find themselves doing yet another thing together which even the best of friends should avoid doing together.

Delivering foals.

My editors (who would like to remain anonymous): Masked Ferret, Tek, Docontra

Warning: Rated T because it contains scenes of childbirth (but not M because it doesn’t show… you know). Although all of you have gone through the process at least once, you may not remember just what was involved. Trust me. It’s both terrifying and worth it.

Picture source: Wiki

Applejack was a bit hesitant and confused when the no good conman, Flim, appeared at her front door, asking for advice. Naturally, she turned away from him, still bitter about everything he has done to her family and friends in the past.

As days go by, however, Applejack comes to terms with Flim. And, she quickly realizes that just like ponies can change, hearts can change, too.

This story is a side story to Chosen Love. Consequently, there are some spoilers for that story.

Sex tag is for a few innuendos.

Cover art made by floravola on DeviantArt, commissioned by HolyCross9!