Only a few hours after she learned of the Griffon Empire's invasion, Princess Celestia surrendered herself to the griffon army and asked for an audience with the Griffon Emperor.

The Emperor thinks she's here to negotiate Equestria's surrender.

He's wrong.

Spanish Translation
Polish Translation

Princess Celestia is getting tired of her sister skipping out on her royal duties for trivial matters that she calls 'emergencies'. Princess Luna don't care.

Nightmare Moon may be stuck in the Celestial prison but that doesn't mean that she won't be rehabilitated. After all she needs to be civil with her Co-Regent doesn't she? But how can she and Celestia be civil if they are millions of meters apart. Simple, letters.

Edited by Zodiac
Preread by Jumbled

It has been almost a year since Luna is back.
And Celestia doesn't have a clue,
that she is planning a surprise attack.
What daft situations could ensue?

Cover image credit goes to 'Yamino
http://yamino.deviantart.com/

Celestia, bored from her centuries-long routine of the same, stagnant thing day in and day out, snaps, causing the Princess of the Sun to make a few drastic changes to her life. A few drastic changes that might not be such a good thing for Equestria...

Now with reading by TheCaptainSand - Scarlett Blade

Luna's return was met with significant fanfare, though with all the fuss dying down, and with the formal re-establishment of the night court months away, Luna seems to have had little to do other than lounging around.

or so Celestia thinks.

When she finds Luna entering the Ministry of Records unannounced she wonders, Just what is her little sister up to?

Edit: WOOO! Featured on June 2, 2015 (at least in my country's timezone i think) Thanks to everyone!

Ponies are starting to wonder why Princess Luna and Princess Celestia aren't queens, but the two princesses aren't quite prepared to answer that question.