"It's so nice to see you again!" said the thing that was not Celestia. "Oh yes, I know who you are, Twilight Sparkle. I had a taste of your magic the first time we met. Mortals forget things so easily, I find. Allow me to refresh your memory: you tried to kill me. But you failed, Twilight Sparkle. You only mostly killed me. And I guess that makes you one very unlucky little pony."

Princess Luna's Lunar Stallions kidnap Twilight Sparkle when they see how lonely Luna is, and give her to the Princess as a gift. Nightmare Moon emerges from Princess Luna's psyche during the sleepover. The dark goddess would love nothing more than to have the beautiful mare all to herself, and the resulting chaos forces Celestia to call a psychologist to sort out Luna's multiple personalities.

Bitter from her defeat and exile, the Mare in the Moon watches Equestria move on without her.

Aegis Shield is a writing pony, a Lunar Stallion for Princess Luna's private guard. He doesn't publish everything he writes, though. Let's have a peek into his scrap basket and see what he's been hiding...

After receiving a letter about Democracy from Twilight, Princess Celestia decides that she needs to destroy this idea before a revolt starts up.
This one was also just a ton of fun to write!

Celestia has had enough of half-arsed promises from her loyal subjects. It's time to wear a different hat.

Also on: DeviantArt

Scootaloo and her friends have long been crusading for their cutie marks, but after a long string of failures, Scootaloo is more desperate than ever. Desperate enough to try something as namby-pamby as - ugh - dancing. Will Scootaloo find that dancing's more fun than she expected, or will she end up once again covered in tree sap? Read this to find out!

Featured on Equestria Daily on 7/25/12.

Princess Luna is back! Purified by the elements, restored to her proper self, and reunited with her sister, the younger alicorn tries to stabilize herself in an Equestria that is not how it once was.

This is a collection of stories.

Back in the Royal Saddle: Luna's first act as returning Princess is to choose the two lucky stallions who will act as her personal guard.

A Week With a Loon: Luna takes over control of Canterlot, so that her dear sister may take a vacation.

Balanced: Luna takes on young Twilight Sparkle as her student.

Of Night Light's and Sound Waves: Luna is "persuaded" to go out at night and explore Canterlot.

Update: The story is edited into a proper read without many of the horrors I originally put into it. Enjoy the ride!

Deciding he could be given another chance, Luna and Celestia come to an agreement to release the Chaotic God from his rocky imprisonment, locking his powers with a powerful spell. Magicless and with a chance at redemption, Discord's ways seem less chaotic than ever.

He does cause a lot of chaos though, to the faithful student of Celestia, who had eagerly taken over the task of watching over and teaching Discord by giving him a home under her own roof, in the process hoping to learn more about his species, powers and motives but surprisingly learning much more about both himself and her head... Which puts her in pretty amusing situations most of the time.

An adventure of a silly one sided (???) love and a look into the heart of Twilight Sparkle.

SF (canon species only; no humans) Ponies were magically and genetically engineered to be the perfect servitor race. They are powerful, adaptable, intelligent and completely under the control of their creators. A laboratory accident frees one such pony from her mental chains, but how can one mare save herself and the rest of her kind if she doesn't even know she's a slave?
This is not the Equestria you know and these are not your little ponies... not yet, anyway.

Tags: Adventure, Diamond Dogs, Gryphons, NO HUMANS (did I mention that already?)
Other tags: historical, mind control, Clarke's 3rd Law, excessive use of high energy physics, before they were famous.
Detailed review by PaulAsaran.
Cover art by endrome , used with permission.
Russian translation (partial -- 'unofficially' completed in the comments)
A Soot-Covered World, book 1.