Well it's not actually a sequel. Here is a collection of short stories and histories detailing the life of Alternia, a changeling queen impersonating the life of Princess Celestia. These are the stories of the ruler under her mask.

Reading the main story: Princess Celestia: The Changeling Queen is a requirement if you don't want to be spoiled or confused. I will try to provide background information when I can.

For readers of the main story, there are basically no spoilers if you've read past chapter 8. Enjoy!

This story is a sequel to The Lost Element

Three years have passed since the first human in centuries set foot upon Equestrian soil. With public opinion of humans at an all-time high, the royal family prepares to take the next step in reintroducing humanity to their world. But will the next human to arrive in Equestria make an equally smooth transition as the first, or will history repeat?

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Joint venture between Humanity and EquestrianGeek.

On hiatus until The Lost Element's completion.

When a family of thestrals move to Ponyville, a filly named Redheart becomes best friends with a clumsy, but kind bat pony colt called Shaggy. Fluff ensues.

NOTE: Crimson Star/"Shaggy" is my OC from The Human Pet, but this is not canon to that story.

I never asked for power or leadership. Royalty was a collar around my neck and a weight on my heart. A mask of superiority was born to keep them from realizing how our world was crumbling down to dust. No longer will my people live in the shadows. This plan has to work.

Art by Yula586 on Deviant art https://www.deviantart.com/yula568

This story is a sequel to An Affliction of the Heart: Volume Four

With her newfound responsibilities as Queen, Kuno has seen fit to lead the changelings towards a life of coexistance with ponies.

But there are those who would wish to see such an endeavour fail, and they're not above taking action to make it fail.

Cover art commissioned by Iakovl, drawn by Derpah.

The forest was his new home.

From what he saw, he didn't belong in the town outside of his forest, but he also knew he didn't belong inside of it. His new hole filled legs and black body seemed to make sure he didn't fit in anywhere.

He had planned on trying to figure out what had happened to him without drawing attention, but when he saves three fillies from danger, he knew that his time to think about it was almost up.

The ponies would want answers.

He had none.

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Cover art done by the incredibly talented Mix-up! His DA is here.

Today I did not wake up in a place I recognize. Not that I can remember how I got here. Where even is here? A castle of crystals in a magical world of pastel-colored talking horses. It's like a dream, only I'm also a wearied, mutant bug monster.

What in the world is a changeling? Oh, and what is that about a war we're apparently responsible for? This looks like it's shaping up to be a hell of a new day, at least, if I don't get squashed like a bug before it can even start.

Featured: 2/5/19

Edited and pre-read by: Emtu and Indigo_Celeste

Thanks to all the pre-readers that helped reorganize the first few chapters:
TheOneWithoutAName, TheClassyLeviathan and Mind Jack

Cover art by: KlaraPL

Lord Tempestus once lead armies under the banner of King Lunarum. Five crusades, five victories. Only, his final crusade ended in disaster with the banishment of the Crystal Empire. A thousand years later the Captain General is pulled out of the dungeon and brought back into the light. Without wars to fight, and with Equestria no longer in need of his military prowess he finds himself at a loss of what to do. Life finds him, and he decides to share his story with those who will listen.

Edited by FlutterJackDash

Art by Lillowisp

The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2

1 Year into the First Iraq War a strange ancient device was activated of unknown origin... Objects began switching between this reality and another strange reality which contained Super Natural Creatures. The ones called Ponies were the worst. They insisted that humans wanted to eat their foals and believed they had been brought here purposefully. Eventually they were assimilated into our society but not without some extreme adapting...

We were brought here by unknown forces... We discovered a reality with monsters from our nightmare holding advanced weapons. The humans told us there was no way back to our own world. We were forced to adapt to their ways and their society. We vowed however that we would get back....

Ashcloud and Brian Lutstine are both Gay men.. Just of different species. Ashcould and Brian are both graduated Law School on the opposite side of town and now are going to the same firm. They both like drawing.... But can they possible get along when Brian has a fear of ponies?