Twilight wakes up and finds out that she's changed back into a filly! What kind of trouble will she get into? How will her friends react?

Twilight Sparkle stood on her hind legs, her forelegs to her side swaying back and forth as her scythe dropped to the ground. Tears welling up in her eyes, she looked down at the corpse that laid before her, still young, but ready to die. It wasn't her fault she was chosen for this, all because she became fascinated with new powers.

"I can't believe this."

Twilight stared over the horizon, gazing on the city of Ponyville in the distance. It's inhabitants, who once saw her as one of their best friends, now barely knew her. She could walk the streets to Sugar Cube Corner, or help her friend Applejack on the family's farm. She could even sit in her Library with Spike and read her favorite books.

But none of it would be the same.

"I am evil."

Twilight has always had a facianation for strange magics. Anything new, she instantly tries to find real world scenarios to use them. But during one of her bi-weekly sleepovers with Rarity and Applejack, she stubles onto an old magic book in the basement while playing hide and seek, its title reads "The Art and Form of Mind Swapping." Shenanigans will ensue.

Artwork by Bebopanimebabe and the picture can be found here!

Cheer up, Twilight. It's not every day somepony changes species. In fact, no pony has ever changed species. It's something new and you like discovering new things. Granted, Equestrians don't like new things, especially things that fundamentally alter their government. So maybe there is reason not to be happy after all.

Chrysalis, the last Queen of the changelings, is dying. With her death, her children will die, and the changelings will cease. She has one final plan, a coup to save her race, her children. She must make a new Queen, one strong enough, and smart enough, to save her people. It will be her legacy, and her greatest achievement. Too bad she never asked Twilight if she wanted to help

Dark tag added just to be safe, but its a "light dark" if that even exists.
Edited by: Nadake

Twilight Sparkle: magician, scholar, bearer of the element Magic, and most of all, friend.
A bat, a book, and a bite can change so much of that, and bring darkness to her heart.
Can you keep your friendships when you might hurt those around you?
If you want to hurt them?
Bloodlust can bring an end.

Twilight Sparkle may believe in Pinkie Pie's myriad abilities, but when an opportunity to study them from a perspective she never thought possible arises, how can she resist the chance at the understanding she's always truly wanted? More importantly, can Ponyville survive the trade-off necessary for this opportunity?

What would you do, if you met a pony who was at once your brother, and yet not? Applebuck wishes to reunite with his 'Cousin JayJay', and braves the dimensional divide to reach his goal. But being a small foal, how will he deal with a world in which everything is flipped? His friends, his family, and even... himself?

Twilight Sparkle just can't find enough time in the day. She has to study friendship for the Princess, hang out with her five friends, and juggle her own hobbies and interests besides. But when a novel solution presents itself in the form of an experimental new spell, will it solve her time crunch, or will she be distracted even further?