Luna had just about had it with Celestia. With the foal years behind them, they had slowly begun being bred for life in politics. With Celestia being the older sister, she was tasked with more responsibilities and pressured with higher expectations. But more annoyingly, she never seemed to have time for Luna anymore.
Luna pushed through the wide open doors, flurries of snow swirling around outside. The temperatures were unpleasantly cold, but that hadn't stopped the young mare from going out to the marketplace. Placing a bag of vegetables down on the counter for the chefs to work with. From the kitchen, she made her way up towards the workroom where Celestia was always studying the sun.
"Celly!" She called, bouncing outside the door.
"I'm busy, Luna," Celestia said kindly. "Can you come back later?"
"That's what you always say! Can't we do something together? Do you want to build a snowmare?"
"Go away, Luna!" Celestia scolded.
"Okay, bye..." Luna sighed. "I'll show you... everypony is always raving about how great Celestia is... when is somepony going to notice me?" She didn't speak very loudly, but she was visibly upset, and Celestia didn't hear a peep from her after that.
Back in the workroom, Celestia leafed through paper after paper, textbook after textbook. The sun rose higher in the sky, reached its peak, and started to descend. Having completely lost track of time, Celestia yawned, and gradually put her book away to make her way over towards her room. "I really should make some time for Luna..." She admitted to herself. Luna always wanted to play, and wouldn't have to participate in the political side of things for several more years. She didn't know how lucky she was.
Swinging open the door to her bedroom, Celestia stopped dead in her tracks.
Her desk, her bed, her carpet, her lamp, her books. Everything. Every single thing had been turned into swiss cheese, and the smell was overpowering. Not an unpleasant smell, but there was simply far too much of it.
Backing out of her room, her disbelief soon turned to rage, and she went galloping down the hall.
"LUNA!" She screamed. There was no way the younger sibling was getting away with this.
Forcing open her sisters door, Luna screamed with fright. She was lying on her bed, reading one of Starswirl's newest research scrolls.
"Celly! What's wrong with you? I could have been naked!"
"We're always naked. What did you do to my room?!"
"What?" Luna asked. She looked innocent and sounded innocent, but Celestia wasn't playing that game right now. She was in full anger mode.
"What. Did you do. To my room?"
"I didn't do anything to do it!" Luna insisted.
"Lies! You were just earlier saying you wanted to get back at me, I heard you! And now my entire room has been turned into cheese! And the only ones here are us and Discord!" The draconequus had stayed with them since they were little, and although he occasionally turned out to be more trouble than they were prepared to deal with, the two sisters had taken a shine to him.
"Well ask Discord then!"
"He wouldn't do a thing like that! I want to know where you were this afternoon, do you have an alibi?"
"Yes. I mean no. I mean, I was here, but nopony saw me..." The younger mare gave a resentful huff and Luna pushed past her sister, looking absolutely insulted. "I don't have to stay here and listen to these accusations!"
"Don't you lie to me, Luna! You admit what you did or I'm telling mom!"
"Is that your answer for everything? Wow, how mature of you," Luna muttered, stomping angrily down the stairs. Celestia yelled at her as she left, still unconvinced.
"This isn't the end of this!"
At the bottom of the stairs, Discord was sitting on the banister, despite having been told not to sit on it on multiple occasions. He had grown, and seemed to take that as an indication that he could do whatever he wanted.
"Why the long face, Luna?" He seemed amused by this. "Oh, that was good, I must remember that."
"Celestia's mad at me. Again. She's always getting mad at me."
"Whatever for?"
"Somepony turned her entire room into swiss cheese."
"AHA!" Celestia announced, shouting from the top of the stairs. "I never said what kind of cheese it was! You're gonna get it this time, Luna!" Triumphantly, she ran down the hallway, presumably to try and find their parents.
Discord tsk'd. "You know why you never get away with anything, Luna?" He asked.
Luna sighed. "Serves her right, she's always getting away with things. And I'm always getting blamed for everything."
"Like turning your sister's belongings into swiss cheese," Discord said.
"Yeah, like that."
"Well you're never going to get away with anything with a story like that," he said, rubbing his chin.
Luna frowned. "What's wrong with my story?"
Discord grinned, and snapped a pair of black sunglasses into existence, which he placed on his nose. "It's easy, Luna. It has too many holes in it."
Enraged, Luna chased Discord out of the room, while his infectious laughter echoed off the walls.