This is the collective stories of numerous Anons and a harrowing day with their favorite pet pony, and the most cruel, evil invention of mankind. The Veterinarian clinic.
These stories are not meant to correlate with any sort of canon, and started off as a joke greentext one shot.
Suggestions, comments, and advice are thoroughly appreciated.

This story is a sequel to Parallels

The alliance between Equestria and Alemaneia continues to hold steadfast; Colonel Paul Werner and Generalfeldmarschall Aryanne Land's 'relationship' is at an all-time high... though that does not say much.

Things turn unprecedented, however, when Alemaneia becomes the victim. Actions against the state would never sit lightly with Aryanne, and she vows to unleash the entire military might of her nation against the offending foreign government... even at the threat of multi-state intervention in a to-be conflict. The world pleads with Equestria to rein in the fascist nation or risk a global conflict, and Paul is tasked with talking Aryanne's justified response down.

However, she'll only talk to him on one condition:

He must come to Alemaneia.

All the while, Paul must grapple with some of his biggest demons.

-Reading of 'Parallels' is not explicitly required, though highly encouraged if you want the surrounding details and lead-up.
-Awesome base Aryanne art done by Antamoanimisan-m, sourced to derpibooru. (Their tumblr is NSFW)

It is the year 2038, and the Earth is slowly being consumed by a space-borne monstrosity dubbed the Black Tide, which is using nanotechnology to remake the planet into something hideously alien.

Erin Olsen works for Project Harmonics, humanity's last-ditch effort to find a new world before the Tide can wipe them out. But when that world is found, and it turns out to be occupied, Erin will need to find the courage to face the unknown in order to save the inhabitants of both worlds.

(Many thanks to Easteu for the fantastic cover image for this story!)

Now with its own TV Tropes page

There is now a follow-up to this story: Sunflower - Side Projects
Sequel: Project Sunflower: Harmony

This story is a sequel to Inexcusable

She looked just like Princess Celestia, except marred and broken. Her ceremonial barding had rusted slightly, and dirt matted her coat. Most noticeable was her hair; black streaks accompanied its usual multicolored luster. They looked like discolorations in an old photograph.

Worst was the scar across her chest. Her armor covered it, but nothing could hide what it meant.

The tarnished Celestia smiled at Luna. "H-hello, monster. I would say I am glad to see you, but that w-w-wouldn’t be quite accurate."

A big thanks to AlicornPriest for editing/prereading.

Russian translation by MLPMihail, with editing by Randy1974.

Comments contain spoilers. See here for a complete series timeline.

This story is a sequel to If You Came to Conquer

Princess Nightmare Moon had tried to keep it secret. She had suppressed her power, feigned ignorance, played the outdated fool at every opportunity. She should have known that something like this would happen. A threat that would reveal her, whether she played dumb or not.

If she had to reveal herself, then at least she could protect Equestria in the process. She nocked the arrow. The bow felt so flimsy, but she could not risk him absorbing a spell. She laced magic across the arrow and the string and the air, enough to make it fly faster and aim smoother. She sighted him easily; Tirek was a large target. Now he only had to turn around. An arrow to the spine would kill him simply and instantly, no matter how much magic he had absorbed.

Once he was dead, the hard part would come: explaining herself to Celestia.

Prereading thanks; Meta Four, Blank!, Yami Vizzini, and especially Craine

Russian translation by Doof
Chinese Translation by Dreams Set Free

Comments contain spoilers.

Nightmare Moon won. She defeated Celestia, broke the Elements, banished the sun. This all happened a very long time ago. So long ago, that she has had plenty of time to change her mind.

Of course, fixing our mistakes is never so simple, and never without consequences. Even with particularly potent help.

"If you came to conquer, you'll be king for a day. / But you too will deteriorate and quickly fade away."
— "No Control" by Bad Religion

A big thanks to Craine, Sorren, and Idylia for prereading and editing. If you enjoyed the story, don't forget to check out their pages.

Equestria Daily
Royal Canterlot Library (FIMfic version)
Russian translation by Doof
Chinese translation by Dreams Set Free

Kitsune Heart has done a dramatic reading of this story! Find it over here.
ObabScribbler has done a dramatic reading of this story! It includes a full cast of voice actors. Find it over here.

Comments contain spoilers.

It's been three months since Princess Celestia appeared in your bed. Three months since she took that bed, along with your sheets and your pillows. Three months since she nearly drove your girlfriend away from you. But peace was made, and everything had been going relatively smoothly. Life was even beginning to look up.

Until today.

A spin-off of Ocalhoun's Princess Celestia is in your bed.
Cover art/inspiration by GSphere.
With pre-reading/advice from Admiral Biscuit, NeonGreenTiger, and Majin Syeekoh.

Live reading by Ichabod Creep!
Russian translation by Hellsmenser!
Chinese translation by Dashwhite!

The princess's fanatical student. A startlingly honest bootlegger. A prissy high-class escort. A traitor caught between two loyalties. A hyperactive pyromaniac. A quiet assassin who can kill with a word.

The night that has covered Equestria for a thousand years might just be coming to an end. And all of these familiar faces will be engulfed in the war between a victorious Nightmare Moon and her sister, returned from a millennium of exile.

Even as the sun rises, the situation has never seemed so dark.

This story was edited, preread, and otherwise improved by Einhander, Comrade Sparkle, CartsBeforeHorses, Spigo, and IR Pony.

Paul Werner was a soldier back on Earth; a high-ranking officer, to be precise. He still maintains that occupation in Equestria, as a consequence of both the best and the worst events which brought him there in the first place. In the end, he knows for certain that he would never trade his current life now for the one he had. He felt it was tainted by the... circumstances surrounding it all.

He thought he was over it, and that he'd never have to face any elements of his past ever again. Paul was one-hundred percent right... in a sense. As he gradually found out, Equestria and the world it rests on has quite the lot of parallels to the Earth he left.

Especially one in particular, a mare who goes by the respective title and name of Generalfeldmarschall Aryanne S. Land

Awesome base Aryanne art done by Antamoanimisan-m, sourced to derpibooru. (Their tumblr is NSFW)

Long ago, the founders of Equestria built a magical portal on sacred ground, hiding their greatest secret on the other side. Generations of leaders stepped through the portal so that they might emerge as the equal of their forebears.

Celestia and Luna were the last to enter. For a thousand years, the portal lay forgotten, its purpose lost.

Luna thinks it is time that Twilight learn what it means to rule.

There is now a Spanish translation of this story, courtesy of Spaniard Kiwi