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.

The Canterlot Caverns are a strange and enigmatic place, untouched and forgotten by pony-kind for centuries. So when a strange metal object is unearthed in their depths, it's up to Twilight Sparkle and Lyra Heartstrings to discover the many secrets it holds.

Together, the two of them will have to do their best to understand the remnants of an ancient civilization, and decipher what remains of Those Who Came Before.

The cover-image is a cleverly edited stock image, which was modified by the stupendous Corvo.
Proofreading was performed by the equally fantastical writers:
Timetraveling Pony (Who started as a proofreader when Cloud was writing this. Hats off to him for being dedicated and staying on as a proofreader for me.)
DustyPwny
Tidal
Superluminous
Night Spark
PhiliChez

And a special Thank You goes to The Sentient Cloud for allowing me the honor of continuing this great story after he retired from writing fimfictions.

As it turns out, this story is eerily similar to Lyra Heartstrings and the Hand of Man. Due to their similarity, I feel that it would be appropriate to give said story a mention.

Pincer is a changeling, a proud soldier of Queen Chrysalis. After the failed invasion of Canterlot, he finds himself trapped and at the mercy of Princess Celestia's Royal Guard. Believing that Celestia sees his species as nothing but soulless monsters, he prepares himself for the worst. The weeks crawl by, marked by an endless series of questions he will not answer for fear of endangering his friends and family at The Hive. As his nerves wear down and his interrogators learn just how ruthless he thinks they are, they have nothing to report but his belief that they will kill and destroy his kind without mercy.

Celestia steps in to prove him wrong, and what Pincer learns leaves him questioning everything he has ever known — but also gives him hope for what he'd never thought possible.

Cover art commissioned from http://www.demonkings.com.

Now with a TVTropes page.

A colossal mass of alien matter ends up on the surface of Equestria as a result of a cosmic disaster, and it is poisoning all it touches. Twilight Sparkle and her friends are caught up in the events as Equestria becomes increasingly hostile to ponies, and the ponies become increasingly hostile to each other. But is it the fault of the alien matter, or is something more going wrong?

It is up to Twilight to find the answer and a solution, preferrably one that also preserves the very fragile life of what may be the last representant of an entire species.

NOTES: Formerly known as 'The Creature'. HiE tag is mandatory for all stories with human characters. Note that there is only a human as a side character in this story.

Thanks to Matdat for grammar and spelling check!

Beyond Earth and beyond the Universe within which Earth exists there is a place full of love; the richest mine of love that can be found, as it is seen by those capable of utilizing it...

Within that place, specifically a part of it called the Everfree Forest, awakes one such creature: a Changeling; specifically, a Changeling who had been a human on Earth the day before. How will he survive in a body that literally needs love for nourishment, while in a world that is now wise to the Changelings' tricks and has branded them evil? Better question: Will he be able to change more than his physical appearance?

These questions are not the only thing that will plague him, for the hows and whys of his arrival and transformation are in a hurry to reveal themselves, and Equestria's heart will stop as it waits for its fate to be decided.

Now with a side story (with more to come) from other characters' POV!
POV: MANE SIX

Hanna, the CEO of Hofvarpnir Studios, just won the contract to write the official My Little Pony MMO. Hanna has built an A.I. Princess Celestia and given her one basic drive: to satisfy everybody's values through friendship and ponies. Princess Celestia will satisfy your values through friendship and ponies, and it will be completely consensual.

After the changelings' failed invasion of Canterlot, Twilight tries to soothe some of Ponyville's rampant paranoia by casting a spell to prove there are no imposters hiding in the town. But her spell leaves her in an alien body, facing a mob of angry ponies who just don't believe her when she says she is Twilight Sparkle.

Or, at least, she was Twilight Sparkle, anyway...

Featured on Equestria Daily, 2/17/13
Cover art is by the awesome and amazing Conicer

Reader, in ancient days, the old lords of the world numbered in thousands. Then hundreds. Then even less.
Now, they are found only in tapestries and fanciful ballads.
The creatures are all vanished. All but one.

Rumors say there are more of him, somewhere far away. A young and supposedly gifted mage called Star Swirl, and Heartstrings, a gentle spinster, have joined him on a journey to find the rest.

Featured in The Royal Guard's Fic Spotlight #5
TV Tropes page (that could use more love)

You'd think that being trapped in stone would mean that, if nothing else, I could get some peace and quiet. Unfortunately, it seems that Celestia has other ideas.

She has appointed these ponies... these 'Keepers', as she calls them, to keep me entertained during my incarceration.

Honestly? I'd prefer the boredom.

Cover art by matrosha123
Spanish Translation by SPANIARD KIWI found here

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