It was centuries ago, in the beautiful Everfree Forest. The castle rose from its place near an enchanted waterfall, it's top spires seemingly grazing the sun. A light pink-colored filly with a taffy-colored long mane and eyes can be seen stepping down the gray-colored stairs with a joyous grin plastered across her face, followed by a tinier grayish-blue-colored Alicorn with a cornflower-colored short mane, her greenish-blue eyes sparkling with excitement.
"A princess needs to be quiet and serious all the time!" Exclaimed Celestia, quickening her pace until she was running.
"A princess needs to be wise!" Luna shouted, extending her hind-hoof under the pink Alicorn and tripping her.
Celestia recovered quickly, and was soon flanking Luna. "A princess needs to be clean all the time!" She said, leaping off into the air and landing on top of Luna, causing both of them to fall on the ground. Soon, the two sisters were rolling on the grass, giggling contently as they playfighted each other.
Suddenly, they bumped into something, which stopped their movement. Glancing up, they saw their parents – a pure-white colored Alicorn mare with a shimmering golden mane and amber eyes, which was their mother, Elysian, and a grayish-blue-colored Alicorn stallion with a mane that had the night sky in them, which was their father, Astro, who had his dark blue eyes fixed on them. Both of them were flanked by a group of Royal Guards.
"Celestia, Luna?" Elysian started with an expression that said 'I want an explanation, and I want it now.'
They both blinked. Usually, their mother was cheerful whenever she came back from patrol after checking her kingdom's status and making sure everything's safe. But now, she looked completely anxious, and had an expression that made it look like seeing them was the last thing she wanted.
"Well, um, we finished our Magic Lesson with Mr. WeirdoBeardo– I mean, Starswirl The Bearded, and we thought we can have some playtime together…" Celestia answered hesitantly, hauling herself to her hooves and staring at her parents with innocent, 'I did nothing please don't ground me' eyes.
"Well, you need to go to your History Lesson now, Miss Aly's waiting."
"Yes, mom," they both replied in unison, slowly turning around and withdrawing back to the castle.
"What do you think is making our mom act strange like this?" Luna asked as they approached their bedroom to bring their saddlebags.
"I don't know," Celestia replied quietly. "But whatever it is, it's not good."
Celestia and Luna were already in the history classroom. Celestia was staring ahead with a cheek resting on her hoof, her eyes narrowed with sleepiness. Her sister, Luna, was doodling in her journal, not really listening to whatever the teacher wanted to teach them. She was sketching the map of The Land of Three Tribes. She always liked the idea of exploring the whole world, to discoverer what nopony did before her…
Suddenly, a paperball hit her head, snapping her out of her daydream daze. Fixing her blue gaze on her sister, she could see that her sister was holding up a paper that said 'What are you drawing?'
Luna quickly replied with a 'Map of Land of Three Tribes'.
"Hey, Luna," Celestia whispered. "A princess doesn't prank her teacher!" She fixed her pink gaze on her teacher. Her horn sparkling to life, she floated their teacher's coffee into midair, using a 'Heat Spell' she learned a while ago. Soon, the liquid was bubbling. Stifling giggles, she placed it back on the desk.
After a few moments, the cup was surrounded by yellow aura, and was lifted to the teacher's mouth.
"Argh!" The yellow-colored mare exclaimed, then the cup fell onto the ground. Soon, it was shattered to pieces.
"Girls!" The mare called angrily as the fillies started giggling. "This lesson is important! It makes you lean about the past years of our land!"
"We're already done with thaaaat," replied Luna fiercely.
"Then that is it!" The mare said, adjusting her glasses. "Class is dismissed!
"And don't forget that you have reports to turn in about the discovery of the third tribe essay!" She added as they eagerly galloped out of the classroom.
"Freedom!" Celestia exclaimed as they ran down the hallway.
"A princess needs to be reasonable!" Yelled Luna joyfully, giving her sister a sidebump as they raced on.
"A princess needs to be sensible!" Celestia exclaimed, shooting her sister a magicstrike that pushed her a few hoof-lengths away.
They both skidded to a halt as their purple-colored foalsitter stood at the end of the hallway, looking at them with expectant eyes. "A princess needs to follow her foalsitter back to her bedroom for her break," the young mare said with a confident smile.
Celestia was sitting on her pink-colored, cozy covers, playing with some blocks. Her side of the room was painted with yellow, resembling the daylight. The other side was blue-colored with tiny white-glowing dots that resembled the galaxy, and Luna was laying on her rich blue-colored covers, sketching her map-thing.
"Hey, Luna!" Celestia whispered. Once she got her sister's attention, she said, "I bet a princess doesn't make fun of her foalsitter!" As she finished that sentence, her horn sparkled to life, and she shot the mare a magicstrike that put her mane to an end, making her look like a clown.
"Celestia!" The mare called angrily, crossing her hooves. "What did I say about your way of 'having fun?'"
"You don't like it," Celestia said casually.
"But you still love us!" Luna added cheerfully.
"… that's true," their foalsitter admitted with a chuckle. "Time for class."
Celestia and Luna were now running down the hallway, singing their favorite song.
"… you're the sun to my daylight!" Luna sang.
"And you're the moon to my night!" Celestia replied with a smile.
"And you're the warmth of my day!"
"And you're the moonlight that shows me the pathway!"
They continued till they were breathless. Now, they were sitting side by side, staring as the moon slowly rose to its peak. Celestia was staring ahead at the glimmering stars curiously, while her sister was hugging her journal.
"What will you do when I'm on my adventure?" Luna asked suddenly.
"I'll rule the kingdom in safety and wait for you to return," answered Celestia carefully, and Luna's response was a frown; and she probably knew why. Her sister was afraid that being a princess would prevent her from exploring the world. "You will travel through the land, Luna. And like I promised, I'll rule the kingdom while you're gone," Celestia said, unfolding her wing and wrapping it around the younger Alicorn.
"Thanks, Tia," Luna replied, smiling.
"Tia, I'm glad that you're my sister," Luna said softly after a few minutes of silence.
"And I'm glad you're my sister, too, Luna," Celestia replied.
"We'll stay together."
"Forever."