In an Equestria without the Princesses or the guidance of the Elements of Harmony, Twilight Sparkle is a researcher on the cusp of her greatest discovery and simultaneous fall from grace while finding love at the same time.

Initially written for the May/June Twiluna contest. Proofreading and idea-seeding credit goes to Pearple Prose Rated Teen for language and implied sex/violence.

Distance can drive us apart. It can also bring us closer together.

After all is said and done, and the ponies have gone their separate ways, the only way they have to keep in touch is through letters.

Original Equestria Daily post is here
Russian translation
Chinese translation
Polish translation
Spanish translation

Now with music and audiobook

At 3:15 AM, Adams woke me with a loud knock on my front door.
"Put your boots on," he said when I answered. "There's a biblical monster in my house."

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A Visual Companion, by the author
Interview with the author, from the Royal Canterlot Library.
Audiobook by Robin Jacks and Wubcake.
Audiobook by Scribbler.
In-depth analysis by the Heroic Tales cast.
Literary Analysis by ScarletWeather.
Special thanks to GaryOak.
Reviews:
City of Doors
One Man's Pony Ramblings
PresentPerfect
Louder Yay
Between Lines
Bad Horse

Daring Do cannot believe her luck when she is asked to help explore the most ancient tomb known to ponykind. But terrible danger awaits her, for beneath the earth rests something beyond equine understanding.

Warning: comments contain ending spoilers.

TVTropes page.
Alternate ending by Duplex Fields.
Archived in the Pony Fiction Vault.
Reviews:
One Man's Pony Ramblings
Louder Yay
PresentPerfect
The Royal Guard
Cleverpun's Critique Corner
The Goodfic Bin

Every night, in a little stable just outside of town, an old mare lays down to sleep. And every night she has the same dream of rainbows and open sky...

"Our life is a journey
through winter and night
we search for our way
in a sky without light..."

The old stories tell of the Mask of Lies, that entraps its wearer as certainly as it entraps everything around it. The worst lies of all are the ones we tell ourselves.

Spanish Translation: https://www.deviantart.com/spaniard-kiwi/art/Tan-facil-como-mentir-999963762

Daring Do returns to the Riverlands, the home she left behind years ago. On the road to the farm where she was born, she wonders if you can ever truly escape the past. Sometimes, the river comes up, the levee breaks, and you have no place to stay. No amount of crying can stop its inevitable progress.

When her mother passes away unexpectedly, Twilight Sparkle reflects on a parent she neglected in pursuit of her own dreams. With only a little time left before the funeral, she returns home to piece together what she can of a life she barely remembers, hoping to make peace with the memories of a pony she took for granted.

A letter from Celestia interrupts one of Pinkie's parties with disturbing news. Now friendships will be pushed to the limit as Twilight struggles to uncover which of her friends is not who, or even what, she appears to be.

(While not a romance, this does contain a shipped pair)

in Russian

There's been another sighting of the mysterious Mare Do Well...but this time, all of Rainbow Dash's friends plead ignorance, insisting that they've put aside their costumes for good. Rainbow Dash is determined to uncover the masked mare's true identity before she's humiliated yet again, but this time around, the vigilante seems especially interested in her as well. Will Rainbow Dash be able to solve the mystery before the culprit takes the hoax too far? Or is she in danger of losing not only her mind, but her heart?

Featured on Equestria Daily.