Letters. Everyone writes them, and they're not just for ponies. Be they carriers of serious news, friendly correspondence between pen pals, or declarations of heart and heartbreak, each one is written with a clear purpose or goal in mind.

Celestia uses them to try and keep her faithful student and friends in line, and try to keep an unbalanced world on the straight and narrow.

This is much harder than it sounds.

Now with an audio reading by Lady Tenkage!

Side Stories:

Old-Fashioned Bar Hoppers, featuring Celestia, Mayor Mare, and Granny Smith shenanigans.
Journal of an Adolescent Clone, featuring Sunny and Moony shenanigans since Season 5.

The ever-helpful Twilight Sparkle sets out to design a compound to help increase brain activity in those who have a willingness to learn, but have trouble grasping difficult concepts. After acquiring a test subject in Rainbow Dash, the results are indisputable! Rainbow grasps new ideas and theories faster and more completely than ever before! But, how smart is too smart?

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.

During an evening performance at a private manor, Octavia is shown one of the rarest and finest instruments known to Equestria, a Stellar Variance cello. Just being in the same room as one is a dream come true for Octavia, but then she is given the chance to play it. It is an opportunity Octavia can't pass up, no matter the consequences.

Yet, the next morning Vinyl finds herself at the same private estate, searching for the friend and roommate who never came back.

A spell gone wrong, Twilight, Celestia and Luna have no answer how to get back home to the Equestria that they know.
Instead, they're stuck in a place where things are similar, yet so different.
They're stuck in what Equestria could have been.
And all they have is a book and their memories to help them.
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Proofread by WickedlyTragic and Fuzzman

This is my first attempt at a full on chaptered story. So whether it turns out bad or good we'll have to wait and see.
EDIT 15/8/14: This got featured? Holy Celestia and Luna...
EDIT 2 29/10/14: Got on the Popular Stories... hnnng

All Twilight had to do was finish Starswirl the Bearded's final spell. She didn't have to become undead, seal her soul in the Elements of Harmony, or enlist her friends in an effort to fix everything... but you have to play the hand you're dealt.

Even if it's rotting off.

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Big ups to Themaskedferret for all her support on this story.

Princess Luna tripped and fell while dreamwalking, causing the night visions of everypony in Equestria to merge with one another. Now it's up to Twilight and her friends to group up in the dreamscape and "kick" the Princess of the Night awake.

It's okay, though. They've done this before.

It has been twelve years since Twilight Sparkle was shrunk to 1/100 of her original mass to minimize the damage caused by her uncontrollable surges. Twelve years of struggles, challenges and hard work as Princess Celestia’s student, in which the tiny mare found the joy and excitement of facing everyday adventures of a huge world.

One year before Nightmare Moon’s return, Princess Celestia sends her tiny student to learn about pegasus magic from professionals, the Wonderbolts themselves. Much to the princess’s pleasant surprise, Twilight forms strong bonds of friendship during her one month of studies with Soarin' and Spitfire while the Captain of the Wonderbolts, Impressed by Twilight’s talent in magical surgery after the crystal mountain incident, offer her a job as one of the Wonderbolts’ medics.

While Twilight accepts the offer with Celestia’s blessing, provided that it would not last longer than half a year, the other Wonderbolts are not too happy with this idea. Will Twilight manage to win their trust, and what kind of adventures and challenges await her so far away from her home in Canterlot castle? Only time will tell.

This is a sidestory that takes place in "Celestia's Tiny Student" between chapter 20 - "Camping Trip" and chapter 21 - "Birthday Party."