Twilight Sparkle, Princess Celestia's most prized and faithful student, is being sent to Ponyville to learn about the magic of friendship.

And she's not happy about it.

Hear what Celestia has to say back! Check out the spinoff:
Responses To A Disgruntled Friendship Student by keaton-furman-prower

Still want more? Have a multiverse spinoff by MixMassBasher, my contributing writer for Seasons 5-9.
Letters From Across the Disgruntled Multiverse

Editing by Neko Majin C.

Disclaimer:
The following is a work of parody, and is protected as Fair Use under section 17 U.S. Code § 107 of US Copyright Law. My Little Pony: Friendship is Magic and all affiliated characters are property of Hasbro Inc.

A few weeks ago, Chrysalis and her brood attacked Ponyville for revenge against Twilight. During the fight, the final spells of the two collide and create a portal that they're sucked into. The Princesses with the help of the others manage to summon them back only to find... that the two are marefriends!? How the buck did that happen!?

Pinkie Pie gets her friends to explain various aspects of Ponydom to the audience (aka a wall of Sugar Cube Corner's kitchen). A silly story poking fun at some of the fan-produced elements of MLP.

Twilight Sparkle is fed up of her unrequited love for Rainbow Dash. She has decided that the time has come to reveal the passion she has kept hidden for so long - but how? There is only one sane, logical way to do this.

She must become a cloud.

Nothing can go wrong.

The royal court of Canterlot welcomes its newest member with open forelegs: the human philosopher Voltaire, from Earth.

On Earth, Voltaire is known as the greatest enemy of tyranny in the history of literature, and a legend in his own mind.

On Equestria, the court betting pool is giving him a week before the Princess banishes him to the Moon.

Note: This story doesn't have sequels per se, but there are a couple of short follow-ups set in the present day ("Parade Coverage" and "Secret Histories"), and a prequel of sorts in "At the Inn of the Prancing Pony".

TV Tropes page.