Most work undertaken by princesses is fairly tedious, and a good chunk of it is paperwork and letters.

Celestia is interrupted while dealing with some of this.

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The Straight To The Point Studio version.
My version.

Three weeks after the events of Rainbow Rocks, the sirens are desperate. Without their hearts—the jewels that hold their magic—they have no power. They can't sing, can't manipulate people, and worst of all, can't feed. Their only hope is to restore their hearts, and they need to do it soon, before all three of them starve.

The problem is, they're not sure how to fix the hearts. All they've managed to figure out is that they'll need magic to do it, and magic is exactly what they don't have. Scared, starving, and completely out of options, the sirens turn to the last people who would ever want to help them, and the only ones who actually can: the Rainbooms.

In this alternate take on the ending to Season 2, Chrysalis actually triumphs, defeating everypony and turning Princess Celestia into a Changeling. However, almost immediately, Chrysalis's plans begin to go awry. For Changelings feed on love. And who is more beloved in Equestria than Princess Celestia?

While lounging around Twilight's castle and airing some friendship-related grievances, Discord stumbles across a magic book containing letters from an inter-dimensional pen pal. As it just so happens, this pen pal also had sinister designs for Equestria, but was quashed by the Elements of Harmony. What's more, she's made amends since that day, and she's now Twilight's friendship student. Eager to bond with someone who can relate to him on a personal level and grow into a better draconequus, Discord packs his bags and heads off to the human world with Twilight's semi-blessing. His mission: Befriend Sunset Shimmer.

However, his plan has a bit of a snag. See, Sunset hasn't been keeping up with Equestrian events, and she never got the memo about Discord turning over a new leaf. As such, she believes that his sudden appearance doesn't bode well for Equestria, Canterlot High, or herself. Not only this, but the Sirens are privy to Discord's return as well, and they see this as a golden opportunity to bounce back from their own recent defeat. Well, Adagio does, anyway. Sonata doesn't want to live in a world that makes no sense, and Aria would rather maintain what little dignity she has left by not getting involved (or so she claims).

So while Discord is trying to earn Sunset's trust and show her what a good friend he is now, Adagio is trying to get in on an evil scheme that doesn't exist. And while that is going on, Sonata is appealing to the Rainbooms behind Adagio's back, hoping that they'll make Discord go away. With so much miscommunication thrown into the mix, you just know that hijinks are inevitable. Good thing Aria made popcorn.

Cover art provided by the amazingly talented Neighthirst.