My Little Pony: Pinkie Pie's Life-Changing Punishment
 

During a morning in Ponyville, a knock comes from her castle's front door. Princess Twilight Sparkle's ears perk up. She thinks she knows who it is. She trots downstairs and answers.

"Hello, Pinkie Pie! I'm glad you showed up. How are you doing?"

Pinkie pie gave twilight a hug and giggled. "Good morning twilight I'm doing great I'm still thinking about Yesterday's fun Fluttershy let me play tag with the animal's it was a great time" she let out a little yawn and rubbed her eyes "Sorry I'm still waking up as it's still early for me and I kinda went to bed late because I was watching cartoons"

"No problem. Where you're going, you'll get to nap as much as you want." Twilight leads her to the library and sits her down.

They initially start with a casual conversation. It then shifts into topics of Pinkie's usual enthusiasm. But then into something more serious.

"So, about that stunt you pulled last week about the animals rampaging through town..."

Pinkie pie gave a look of confusion as she followed Twilight into the library but shook it off and soon talking about their other friends and what they've been doing lately she followed her friends lead and sat down and blushed feeling embarrassed at the mention of Las week's incident.

"Umm...about that I'm sorry I was just playing with the animals to at that time but then things escalated when I accidentally jumped into a mud puddle and they got upset" she looked at the ground not wanting to look at twilight in the eyes.

“Hmm… I see. Pinkie, you can’t keep on making reckless choices. It has been going on for a while and it needs to stop. So, I’ll tell you what I’m going to do. I’m going to have you stay in this castle for a while. Maybe a short detention period will break the cycle.”

Pinkie's eyes widened and she stood. "What? Twilight I would love to stay with you in the castle I can only imagine all the fun we would have living together...but unfortunately I can't as I have to take care of my parents bakery which I'll be taking over in the future"

As for what happened I apologized to everyone and gave them cupcakes to show I meant it" she frowned. "It worked kinda...Fluttershy said I'm not allowed at her place alone saying I need parental vision like I'm a foal" she blushed.

"And that's why I set this up. Just for you." She leads Pinkie to a wooden door, unlocks it, and reveals the interior. "Voila!" What's inside is a room with bright blue and pink colors along with a colorful playmat, toys scattered around, a crib, a high chair, and a changing table. On the right is a door leading to a bathroom.

"You setup a room for me already?" ("Did she ignore what I said about my parents shop?") She thought and followed twilight to another room and what she saw the girl couldn't believe and took a few steps back feeling overwhelmed. "Tw..Twilight what is this ? Look I'm always willing to play with you' she tried to calm down her beating heart

"This nursery it's cute but we are to old to be playing house...wait she shook her head as it just hit her "what do you mean you set this up for me? And this is princess Celestia's castle does she know about this?"

(Oh, I meant this was Twilight's castle, actually)

"Oh, I set this up to take care of a particular foal. And that foal... is YOU!" Twilight beams.