This story is a sequel to Celestia's Tiny Student

(Title changed from "Ponyville's Tiny Librarian" for reason pointed in this blog )

Twilight Sparkle is a one-kilogram pony the size of a large rat, shrunken by Princess Celestia following her entrance exam to the Celestia’s School for Gifted Unicorns to ensure that her power surges would not pose a danger to the ponies around her.

She’s spent thirteen years full of hard training at her new size, facing the life-threatening experiences that came with living in a world of giants. To survive those thirteen years of hardship and joy, of learning and adventure, and of pride and humility, Twilight has challenged herself to be stronger, to overcome any obstacle.

Now that tiny Twilight is on her way to Ponyville to oversee the preparations for the Summer Sun Celebration, how well will this miniature mare fare outside of the confines of the castle? How will the other Element Bearers react to her? How will Nightmare Moon react to the tiny unicorn? Is Twiny prepared to face Ponyville, and, more importantly, is Ponyville prepared to face her?

Credits:
Art cover - kc day

Top editors: (editing and rewritting for months, hope quality is to your liking).
Kydois
Georg

Nightmare Moon's sentences editor:
Bahatumay

Applejack accent editor:
Crimson Star (Chapter 1 - Applejack)
Rebel Brony
The Notebook is grounded

Pinkie sentence's editor:
Plump it UP

Other editors:
Hereward
tana1100
Lab (small editing from prologue to chapter 4)

Pre-reader:
Rated Ponystar

To celebrate the release of this sequel, I created a group called “Twinyverse” for all fans of this story where you can talk about it and track all side stories with ease.
The Twinyverse Group

When Twilight hits the books hard, Celestia suggests the use of a music box as a study aid.

Commission for Anonymous

(Do not continue reading if you do not approve of mental regression, or adult baby themes. If you do not like it or are under legal age, please do not keep reading.)

Twilight Sparkle isn't feeling too well, and it is up to Princess Celestia to nurse her back to health. It would be a simple task, if not for the fact that her student was thirteen years old with an uncontrollable amount of magic.

To make matters worse, six years ago Celestia was forced to shrink Twilight to 1/100th of her size so that her untamed magic wouldn't be a threat to Equestria. She would have to remain tiny until she would learn how to control her enormous power.

But surely a two millenia old alicorn with enough magic to destroy a small mountain can handle her littlest, fragile and most magical subject... right... right?

This sidestory takes place between chapters 4 and 5 in Celestia's Tiny Student.

Special thanks for pre-reading to ambion, I took some inspiration from his story called melt, worth checking it out for additional dose of cuteness.
List of editors, thanks for fixing grammar guys, you did a great job:
Solstice+Shimmer and Word Worthy

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."

Twilight is known for many things: being the shrunken student of Princess Celestia, an adventurer, powerful magic user, avid learner and reader, and more. But one thing she's never been is a prankster. When she learns about the holiday known as "April Foals Day" she decides to take part in the holiday and prank her closest friends and family for a few good laughs.
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This story is a gift to my friend CommanderX5, the writer of Celestia's Tiny Student. Note that this is in canon with his story and takes place after Twilight's duel with Celestia, but before she meets the Wonderbolts.

All the castle staff of Canterlot know that when seven-year-old Twilight Sparkle has a problem, the correct answer is always "Let Celestia handle it." But this time? Celestia's student has come up with a theory that she wasn't quite expecting.

Yeah, this needs fixing.

Just a short little something that hit me out of the blue and demanded to be written. Not my usual cup of tea; criticism welcome.

This is absolutely adorable, and exactly what you should read if you're looking for something sweet and cute that won't test your brain or stomach, but will test your smile muscles.

—Louder Yay

Check Ichabod Creep's Audio Reading!

Special thanks to Super Trampoline for pre-reading!

Cover art used with permission from mysticalpha.

During the entrance exam to Celestia's School for Gifted Unicorns, Twilight completely loses control of her magic. Celestia tries in vain to calm her down, but having no other choice she's forced to use a shrinking spell on the filly in order to tone down her dangerous surge of power.

After the exam, Celestia takes the tiny Twilight as her personal student to teach the young unicorn control over her powerful magic, making sure that she will pose no threat to other beings.

Will tiny Twilight be able to step out into a world designed for someone far larger than her? And will her size impede her in the trials of life as princess personal student ?
Side stories: "My Little Twiny April Foals Day" and "My Little Medic"

[img]https://imagizer.imageshack.us/v2/109x149q90/138/zvuu.png[/img] [img]https://imagizer.imageshack.us/v2/136x137q90/843/7m25.png[/img]

Sub-autors:
Kydois (Audience <3!)
Georg

Editors:
kingtiger666
Ultra1437
Frozen Ice King

Pre-reader:
Rated PonyStar

Princess Cadence is a foalsitter who, being in rich, hoity-toity Canterlot, has to put up with spoiled brat after spoiled brat.

Twilight Sparkle is a terrifying filly who drives away sitter after sitter.

They were bound to find each other.

After browsing the magic books in the late afternoon Princess Twilight accidentally recites a spell that turns her back into a filly except with her new found ascension; she has now been turned into an Alicorn filly. Now the princesses of the sun and moon have to take care of her...for however long that is. Can they find a cure or will Twilight start her life over again?

I am sorry for any similarities to any other stories, I can assure you these are all my ideas.

Annoyed that the nobles keep taking up all of princess Celestia's time filly Twilight vents the only way she knows how. By writing an essay! However she wrote this essay on the blank bottom of the scroll containing the speech Princess Celestia was to read to her little ponies. And once the speech ends, Celestia doesn't stop. Much to the horror of some of the nobles in the crowd.

Proof read by Cobalt Comet

Edited by Dark Chocolate

This story now has a Youtube reading.