"Wheeeeee!"
The joyful squeal erupted from the pink-haired filly as she slid herself down the roof of her home for what had to be the fiftieth time. Celestia knew she wasn't supposed to do this, but it was too much fun to resist. She would slide down, jump off at the bottom, and flip herself upwards before she hit the ground. Then, she'd fly up and do it all over again.
Just as she finished her fifty-first slide, she felt something grab her before she could jump off. Or rather, somepony. She looked up to see her mother's stern face and she frowned as Eos brought her to the ground next to her father.
"Come inside, Celestia," Eos ordered. "We need to talk."
"Yes, Mother." Celestia followed her parents inside, hiding a pout about her fun being spoiled. They took her to her room and all three sat on her bed, Celestia seating herself between them. Instead of punishment, Eos gave her a small cup of some tea, and her parents watched with what she couldn't help but feel weren't the most genuine of smiles as she took a small sip.
"Am I in trouble?"
"Not this time," Astraios replied with less strictness than Celestia expected. "Your mother and I have some exciting news to tell you."
Celestia shifted her eyes from her father to her mother and back and forth for a few seconds. She said nothing, only taking another sip of her tea, but she relaxed herself, so her parents assumed they had her full attention.
"Celestia, do you ever feel lonely?" Eos asked.
"No..." Celestia quietly questioned the sincerity of the question.
"Your father and I aren't here as much as we'd like to be and we can't take you with us all the time. We know you love your nanny, but what if you had somepony closer to your age?"
"Like who?"
"Like..." Her parents spoke in unison and smiled dramatically. "...a sibling!"
"A... sibling?" Celestia muttered. "Like a brother or sister?"
They nodded, but Celestia only looked confused rather than excited. "Where do we get those? Do we farm them?"
"No," Eos answered, giving a light chuckle. "It'll take several months, but by next year, you'll have a new sibling."
"Wait, what?!" Celestia almost spilled her cup of tea. "I didn't say I wanted one!"
"Cele---" But she cut her mother off.
"No, I don't want a brother or sister! No, no, no!"
"Celestia, stop that!" Eos sternly ordered her, taking away the cup.
"No, I don't want to be a big sister and you can't make me! No!" She furiously stamped her hooves on her bed and began screaming. "I said no! No! Nooooooo!"
Her tantrum came to an end when her father smacked her rump, enough to snap her out of it, but not to knock her over or leave a print. She instantly quieted and looked at him with tearful eyes and pouting lips, letting out a small whine.
"Young lady, behave yourself!" he scolded her. "You know better than that!"
Celestia tried to run off before either of her parents could say more, but Eos froze her in place with levitation and brought her back over to them. Eos held her in her hooves, and Celestia looked up to see her two very angry parents glaring at her. They needed no words to inform her she best not make even the tiniest wail. She poked in her lips and stopped struggling. Her mother let her down and she obediently sat between them again.
"You have earned yourself seven moons in your bedroom!" Eos told her. "Which means we won't take you to Snowfall Hills."
"But---!" A narrowed glare from her mother reminded her it was a bad idea to speak right now.
"Celestia, we know having a new sibling is shocking," her father said, his stern tone not faltering once. "It takes some getting used to. But what you did is inappropriate! You can't scream every time you don't get what you want!"
Her parents climbed off her bed, but Eos magically halted her again when she tried to follow. "You need a lot of time to think and you will have all week. For today, you can come out when you're ready to apologize!"
With that, her parents trotted out, leaving Celestia alone on her bed. Barely a moment after the door closed, Celestia bawled again. Her frustrated parents could sigh heavily in response. Astraios placed a lock spell on the door to ensure Celestia wouldn't leave, and the couple went to their own bedroom.
To say that could've gone better would be an understatement.