This story is a sequel to Harmony Unfurled

Luna is tired, and ready to settle into a nice, quiet life. Being a librarian is not the most glamorous job in the world, but at long last, her life finally feels like it belongs to her.

But it's fall. With the cold air rolling in, new threats lurk into the lengthening shadows. Some are old. And others, new. It seems the quiet life will have to wait.

Luna has fallen back to Equestria. And, to her shock, she is no longer Nightmare Moon. Perhaps this is her second chance at life. Will she find it, wandering aimlessly into the nearby town? What will the new ponies she meets think? Can she truly hide among them, disguised as one of their own? Well, perhaps, with a little help from some new friends, as she leaves behind her crown, to run away from her past that haunts her.

But can you ever truly escape the monster you've become?

After having a terrible and horrible life , I was given a chance and made a deal with the dev-I mean Discord. Transferred as a god with dashing features into a television program that I never paid attention to ? Hell yeah. My only concern is what Discord meant by 'prone to enslavement.'

The last nine hundred years haven't been kind to Spike.
 
Unable to live in pony society at his current size, Spike sets off on a journey to find the spell that can revert his rampant growth. But he's not the only one searching for the cure.

From a lost library buried deep under the frozen north, to the seedy depths of a starlit metropolis, to the desolate surface of the moon, Spike will go to any length to reclaim what time and biology have taken from him--if the journey doesn't kill him, first.

 
A story about coming to terms with yourself. Also an entry for the May Pairings Contest. 

A foal walks up to his parents and asks:

How was the Crystal City built? The parents respond that, to the north, in the snow, there once lived a couple whose love knew no bounds. Then one day an evil sorcerer came and demanded the couple submit to his will. The couple rejected his offer and fought back. In the ensuing battle, only one stood, her husband dead and the sorcerer gone. The mare, heartbroken by the loss of her husband, tried to join him in the afterlife. But before the sorcerer left he placed a terrible curse upon the mare in revenge that she may never die unless she builds a city for her husband out of a small crystal that only forms every 100 years at the peak of the highest mountain of the land. And that when the mare has completed her task and the city is built the curse will be broken, and that she may be with her husband once again for every second of Eternity there ever was and ever will be.

This was basically a self-imposed one-day Oneshot challenge. So your milage may vary but please do enjoy the horse words I have provided

The Fire of Friendship has all but faded. One thousand years ago, Equestria fractured... those who disagreed with Celestia's rule left under the leadership of Princess Luna to found their own nation, their own way of life. Seventy years later, Celestia and Luna both disappeared during the first war, leaving the battered nations leaderless in their absence.

Over the last nine hundred years wars have frequently waged between Equestria and Lunaria, each seeking to unite ponykind under their own ideals. Equestria's mastery of magic often gave it the edge in battle, but never enough for a decisive victory. Peace reigns for now, but recent developments in Lunaria signal a shift in the balance between the two divided nations...

Running, it's all Chrysalis has ever done since she was born. Running from her emotions, from her heritage, from Celestia, and now she's on the run again, but this time is different. Twilight Sparkle doesn't give up as easily as Celestia did...

Chrylight in future chapters.

On a quiet hill outside Ponyville, there are two trees side by side. One that butterflies flutter around, and woodland creatures bask in the shade of. And another that if you watch closely as the sun rises and sets, seems to glow.
Every year a mare with a white coat, pink mane, and a cutie mark of a sun obscured by rain clouds sits beneath the second tree and reads a letter.
A simple letter, written by a foolish mare.
A foolish mare that life will never be the same without.

The story of 'The Mare that eats the Monsters' is an old, but still very well known Equestrian campfire and bed time story, often told to scare little fillies and colts into behaving themselves. It tells of a mare who loves Equestria and the ponies who live in it despite how frighteningly different she is. She protects ponies across Equestria from nightmarish creatures and monsters that would seek to kill ponies wherever possible.
What most ponies don't realize, but what Twilight Sparkle is soon to learn, is that the mare of the story was and is very real.

And the stakes of her mission have never been higher.

(This story has the horror tag, yes, but it isn't the dominant theme here.)

Despite how kind and caring Princess Celestia seems to be, Twilight Sparkle constantly worries about displeasing her. From her nightmares of returning to Magic Kindergarten, to being sent to a dungeon, to banishment; there is no punishment that Twilight cannot imagine.

But why is Twilight so afraid of her teacher? Where did this paranoia come from and what secrets has Celestia kept from the rest of Equestria?

Taking place before the Return of NightMare Moon, this story will finally shed light on exactly why Twilight fears the teacher she claims to love so very much.