All of Equestria is united in celebration for the return of their beloved Princess Nightmare Moon. But when Celestia and everypony else recieve her she's skeletally starved, filthy, and very nearly dead. Meanwhile, while everypony's eye is turned, a lusty Blueblood pursues Twilight Sparkle, intent on adding her bloodline to his own so his family might step closer to godhood. (Alternate Universe, there never was a Princess Luna)

Ponies these days are nuzzling younger than ever. Talk to your foals about the dangers of unprotected tummy rubs.

A Los Pegasus charity commission for Pav Feira. He... he gave me the prompt. I had no choice. Forgive me.

Sweetie Belle has been living with Rarity since their parents went off to see the world, but some years have passed, and it may be time for a change.

~~~

Credit to title pic goes to dlazerous of deviantart

After discovering that Cadence is not who she appears to be, Twilight is sent to another world entirely by the disguised Changeling Queen to avoid her plan being disrupted.
When Twilight lands, she discovers that not only have Spike, Owlowiscious and Peewee followed her, but that they've arrived in a world where the main sentient species is human.
There's still a place where they teach magic, though.
Crossover with Harry Potter. Twilight will be effectively taking the role of Hermione.

I've marked this story as cancelled to reflect the unlikelihood of it continuing. If I do come back to it I'll revert that.

This story is a sequel to Ascend

Congratulations, Twilight. With Celestia and Luna on their constitutionally mandated vacation, you're in charge of Equestria. The position of Regent is an honored and hallowed one. But maybe it's a bit early to congratulate you. After all, whether it's a nobility jealous of your ascension, or a military unhappy with Celestia's decisions; one thing's certain: your reign will be anything but peaceful.

Derpy Hooves is secretly a changeling.

Nopony particularly notices, or cares.

(New 9/15/19: Spanish translation by Spaniard Kiwi! Thank you!)

Windfall takes place seven years after FiM's main timeline. The Elements of Harmony have gone their separate ways, but are still close, and all the girls come running to be there on the eve of Fluttershy bringing her first foal with Big Macintosh into the world.

If you enjoyed this story and this fanfiction future extrapolation, please consider reading the sequel Earth & Sky

This story is a sequel to A Tale of the Sun, Moon, and Stars

Twilight Sparkle is embarking on a new path in her life, and Luna is there to guide her to the right one. At long last, it is time for the Stars to come home.

Twilight Sparkle's story, and sequel to A Tale of the Sun, Moon, and Stars.

Cover art by AeronJVL.

This is a story of how the grand spirits of Tyranny and Pride fought in ages long past, battling over the future of the world 'neath stars newly born on a nameless field in the distant north. It is a story of blank skies, of strange endeavors, and of things prehistoric. At least, that's how it starts.

The Crystal Empire makes Equestria look young, and Twilight Sparkle is about to find out just how old Celestia really is.

Celestia left the public eye of Canterlot to be alone with her beloved, Twilight Sparkle. All she ever wanted could finally be hers. Together in love within her sanctuary, Celestia attempts to have a perfect day with Twilight.