A sleeping Rarity mysteriously appears in her friends' beds, and nopony knows how or why. Her friends are determined to discover the truth behind Rarity's night-time snuggling spree.

When Sweetie Belle magically derails one of Twilight’s experiments, she finds that she and Rainbow Dash have switched bodies. While Twilight works on a way to remedy the situation, Rainbow and Sweetie try to live each other’s lives as if nothing has happened.

Which might have worked out, if the weather team hadn’t needed Rainbow’s help. Or if Diamond Tiara hadn’t decided to pick on Scootaloo.

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

Princess Twilight Sparkle has been busy, what with dealing with supposedly reformed draconequui, restoring the ancient castle in the Everfree Forest, and making time helping the Cutie Mark Crusaders learn new skills. So when she finally gets a chance to relax, she decides to engage in her favorite pastime.

Reading!

Which would be a lot easier if Rainbow Dash didn't keep showing up and sitting on her. Or near her. And now she's so busy trying to figure out what her friend is up to, that she's losing out on precious reading time!

Will Twilight ever get to finish her book? Is Rainbow Dash pulling off the most elaborate prank in Ponyville history? Will there be a surprise guest appearance by David Pownie? Regrettably the answer to the last question is no, but find out the in the thrilling story: An Inconvenient Dash!

I saw the image used for the cover art and this story just kinda creeped into my head, and refused to leave. But hey, more Twidash is always a good thing right?

The image for the cover art belongs to Strange Danger, at least according to the watermark and derpibooru tag.

New Patch 1.2
Harmony numbers have been increased 20% across all classes.
Grammar corrections provided by the wonderful Applejack-fan.
Twicon Panic Levels have been fixed to be brought in line with current Defcon numbers.
Bug fixes for the Dragonshy raid have been deployed.
New World Event: Discord's Disco Disaster- Discord is up to his old tricks, turning Ponyville and all its inhabitants into 70's disco versions of themselves. Boogie down with your favorite mare or stallion, compete in special dance themed quests, and earn the special seasonal item -Bell-bottom Bogey Pants +5-!

Diamond Tiara finds out what 'rape' is from a very realiable source, and decides that she wants to try it out. Together with Silver Spoon, Diamond Tiara 'rapes' her three favourite targets, and soon a new trend spreads throughout the school.

The adults of Ponyville are very, very concerned.

NOTE: There is NO foalcon in this story, nor is there anything of any sexual nature, rape or consensual. If you wish to understand, feel free to read on :3

This story is a sequel to Twilight Sparkle And the Very Confusing Day

There were a few loose ends after Discord, who had turned into Eris, had gone into season and turned the entire world upside down in order to create enough chaos for favourable draconequus breeding conditions. Celestia had released the Flutterbeast upon Eris, restoring order and gender normality all over the globe.

Except not everypony and everybody changed back. Males who became mares and became pregnant, stayed mares, Eris' final parting gift of confusion and chaos in the world.

Both of the sexes are now so much more aware of each other's needs following the events of the Great Swap, and Eris' chaos had the unintentional side effect of creating a new level of harmony in the world, as suddenly everypony and everybody now had first hoof (or firsthand) experience in being the opposite sex.

Eris going into season also created the ideal conditions for the apocalypse.

Edit: Featured on Sunday, April 20th, 2014! Oh my gosh oh my gosh oh my gosh!

Years ago, two unicorn prodigies attended the same school without knowing it. One became changed by friendship at an early age--the other far later in life.

At a fashion show gone wrong, the two prodigies at last meet. Being who they are, it's impossible for them to resist comparing notes...

(Companion image graciously provided by TurboSolid on DA. Thanks!)

Twilight’s flying lessons have taken to a slow pace, but things quickly heat up when she gets her very first wingboner... right in front of Rainbow Dash.

Could her best friend be responsible for this?

Youtube reading by Doom Pie Network

Anonymous Unknown, the newest teacher of Ponyville's local University, finds himself in a situation that may need delicate work.

And is that his three star students ask's him to be their special somepony.

Oh dear...

Hi guys! Kro here with something very different!

This story was based on this this picture on devianart, made by the artist skyshek.

This is my first, 2nd person story. So any help is much appreciated.

Rainbow Dash knows one thing for sure, she is definitely not a barbarous, uncivilized dolt who doesn't know polite conversation from a hippopotamus's rear end. And also that she's definitely not the one who's wrong. Rarity is wrong. Rainbow Dash is absolutely, totally, a hundred percent sure of it.

But then why did Rainbow just buy a wagon load of apology bouquets?