Luna engulfed the quill with her starry aura, the ink dripping over the desk as she moved it over the scroll.

"A Princess must always held her head tall in the presence of her subjects..." she read aloud as she slowly wrote the words.

Satisfied with her work she dived the quill into the ink and back to the paper only to discover with horror the words had completely disappeared. Before she could wonder what kind of sorcery this was the sound of her sister snickering revealed the culprit.

"TIAAAAAA!!!"

****

"Stop playing such childish jokes, sister!" Princess Luna chastised her older sibling.

"Calm down Luna, I was just joking." Celestia replied taking another bite of her meal.

"You are always joking, Tia. You never take your duties seriously. Remember we are the Princesses of this country, we must always act according to protocol."

Celestia rolled her eyes at her sister lecturing her for the twelve time that day. "Again with the protocol. Why do you always have to be so boring, Lulu?"

"I am not boring AND DO NOT CALL ME LULU!!"

"Auh! No Royal Canterlot Voice!"

Blushing Luna returned to her meal. From the balcony both sister had a perfect view of the blossoming town of Canterlot. It was hard to conceive that just a few generations ago this was nothing but a frozen wasteland where ponies constantly fought each other.

"Sister, you are a princess..."

"You are a princess too, silly filly."

"You know what I meant. You are the older sister and you have the most important job, raising the sun for our subjects. The day your Cutie Mark appeared you were destined to rule over all of Equestria."

Celestia frowned, irritated that her sister had brought back the subject of her mark. A little embarrassed she covered it with her wing.

"You have the most important duty of all Celestia. You must promise to honor that duty and always look up for your kingdo-

"Stop it!"

Luna froze, surprised by the harsh tone of her sister.

"You always talk like that! Your duty, your kingdom; almost as if you don´t belong in here. This is our kingdom, we both rule this land so stop talking as if you were already gone! You are not going anywhere Luna!"

Once the shock was gone, Luna smiled and leaned onto her sister.

"You promise?"

"Yes yes, i promise to be a good princess!"

That wasn´t what Luna meant but she said nothing and kept smiling.

****

On that day the ponies saw the sky turn black, consuming all the stars; then a striking rainbow pierce through the heavens and once it was gone the night sky had changed, the silhouette of the night princess engraved on the moon.

Celestia crashed into the ground, the Elements, deployed of all magic, scattered around her. Her crown fell off, letting loose her mane which now sporter the entire spectrum of colors instead of her natural pink. She looked up at the night sky, blurry through the veil of her tears.

"...I´m sorry Luna. I´m sorry for being so weak...for not being a true Princess. A true Princess would have saved you from darkness...but I make this promise, the same promise I made so many years ago, that I will become a better Princess. A royal beloved by her subjects, noble, kind and always respectful of the ponies below her and the rules of the kingdom. I will become the Princess you always wanted me to be and once you return, once the stars guide you back to my side, you will be proud of your sister."

(Author Note: Happy New Year to all of you guys! Here´s to another year of wonderful moments to share with all of you and like Celestia I promise to be stronger this year! Best wishes to all of you!)