Applejack threatens Zecora with a shotgun to get her off her farm because she's under a lot of stress. Zecora doesn't take it well, and comes back at Applejack with a little threat of her own.

Takes place shortly after the events of 'Bridle Gossip.'

Contains: Size difference, threats of vore.

A surprise visit from Twilight prompts a conversation about Celestia's unusually long life, and the implications for the young Alicorn.

But immortality comes at a cost, and no immortal would wish it upon another.

6/15/2019: Oh my goodness. Featured. Thanks all!

We all know the story of how the Princess’ young student and five friends defeated Nightmare Moon and brought Princess Luna back to our lands. But what if the tale were false? What if the young Twilight Sparkle on the event of her entrance exam had not been rescued by Princess Celestia, but instead lost her mind among the power of her youthful surge and had to be sent away, far away before she could destroy all of Canterlot with her newfound power. Now the feral unicorn prowling the Everfree Forest only vaguely remembers her past, slipping away from constant terrifying attempts to capture her.

And she is beginning to remember what true power felt like.

Editors include: Peter, Justin, Featherprop, Mitch H, and Bad Horse
Featured on Equestria Daily
Reviewed by Chris on One Man's Pony Ramblings and by Paul Asaran on his review blog
Now with a TV Tropes page

Physical books are available on Lulu.com
Monster in the Twilight (Paperback) 272 pages
Monster in the Twilight (Hardback)

When Shining Armor is alone for the weekend, he gets an unexpected visitor.

Contains: Implied Sex

Alternate "Bridle Gossip", where Twilight and Applebloom decide to talk to Zecora instead of hiding with their friends until she leaves.

Rainbow catches the feather flu, and tries to cover it up. She runs into a certain alicorn on her way down to the ground.

Cover
This story is for The Abyss’s contest

While pouring over the town's taxes, Twilight Sparkle notices an anomaly in Applejack's returns, deciding to confront her about it. Needless to say, backcountry traditions and consumption tax-dodging don't sit too well with the Princess of Friendship.

Cover art by Probablydnon

EDIT: Featured 3/20!

It was perfect, Princess Celestia was dating her immortal student Twilight, and no mortal pony would ever have her. Tempest, finally free of her guilt, arrives at Ponyville to learn more about friendship from Twilight and her friends. Tempest fell in love with Twilight, and Twilight realizes that she's been missing out on the feeling of true love.

Princess Celestia isn't okay with this turn of events, not in the slightest.
Cover art done by snobbleweb!

Twilight didn't know what came over her. At one point, she was having a wonderful tea party with her friends, and the next thing she knew, she was trying to kill the princesses.
This could have something to do with the fact that nopony would listen to her at her brother's wedding, everypony thinking she is crazy, or even the fact that Discord was set free without anypony noticing.
She finds herself at Celestia's court, facing crimes she didn't commit.
"Twilight Sparkle, for stealing the Elements of Harmony, attempting to kill me and Princess Luna, and Betraying everything you were supposed to protect, you are hereby banished from Equestria, never to return!"
Celestia's words continued to ring in her ears as she followed the road out of Equestria. She would never see her friends again.

My entry to The Exiled Competition

Cover art can be found here. It was made by StarlightSpark on DeviantArt.

Princess Twilight Sparkle lay there in anguished silence for almost a minute until she decided to let Scootaloo, Apple Bloom, and me help her. It came out as a whisper: "My special talent isn't magic." Of all the ponies we might help, I had never imagined our first might be Twilight, or that it would essential for Equestria that we got it right.

Featured (as high as #2) from Oct 18th through Oct 22nd 2015 for 100 hours.
Thank you everypony!