"Just sign here, here, and here," said the clerk at the reception desk.

Rainbow Dash did just that, and by signing the adoption papers, she made it official that Scootaloo was her adopted daughter.

"I can't believe it, Rainbow Dash! Am I really your daughter now?... Is my name now Scootaloo Dash?" remarked Scootaloo.

"Yes, you're my new daughter, Scoots, and no, you don't have to be called that if you don't want to," said Rainbow Dash.

"It would be cool to have the last name of the greatest pony ever."

"That's right, squirt. I am the greatest. You may as well be my new little angel and my protege. Now come on, let's go home," Dash said as she ruffled Scootaloo's hair. She picked the filly up and the to flew to Rainbow's house... Scootaloo's new home.

~~~~~

As Rainbow and Scootaloo approached their home, the orange filly saw her life going upwards: Dash by her side to protect her, perhaps joining the Wonderbolts, getting flying tips from the world's fastest flyer... Everything was going her way. She couldn't be more excited for anything. Well, aside from getting her cutie mark and learning to fly, of course.

"Here. You look tired, Scoots. Just sleep on the couch for now. When you wake up, you'll be in your new room," Dash said. Scootaloo did not resist; it was getting quite late. She fell asleep instantly.

~~~~~

Scootaloo woke up peacefully with a little yawn.

"Wow, Dash. That's the best sleep I've had in years!" she remarked. "Wait a second... Dash, why am I tied down?"

Scootaloo saw that her four hooves were tied down to some kind of table. When she looked hard enough, she saw that it was a changing table. Scary enough, it was big enough for a filly her age.

"Oh, good. You're awake. Now we can get started," said Rainbow Dash as she walked in. "This is your room, squirt."

The room looked like some kind of nursery, complete with a crib, playpen, foal toys, and the like, but they weren't the right size for a foal; rather, they looked like they were for use by fillies or even full-grown ponies. Scootaloo was shocked and also astonished.

"Why? Why is this my room?" the orange filly asked.

"Well, Scoots, you are my new daughter, and therefore, I will treat you like that," Dash explained.

"As in, y-you're gonna treat me like a f-foal?" Scootaloo asked, scared.

"Yes, baby," Dash replied as she began taking out a diaper.

"Dash, please don't put that on me! I've never had accidents, and besides, I'm 9 years old!" Scootaloo exclaimed. Rainbow didn't listen as she slid the diaper underneath the filly (Scootaloo was, of course, thrashing and struggling to get free, and Dash saw this as an opportune moment to get her diapered). She applied baby powder to Scootaloo's nether regions, and the smell caused her to scrunch up her nose. Eventually the diaper was folded up and taped in place, sealing it. Ironically, Scootaloo somewhat enjoyed the feeling of the diaper. It was soft and snug, like a cloud was hugging her waist. She cringed at the thought.

"So, how long am I gonna be like this?" Scootaloo asked her new mother.

"As long as it takes," Rainbow Dash replied.

"What do you mean?" Scootaloo asked again.

"Tell you what: If you still want to be treated this way by the end of the day, fine by me. If not, I'll have somepony redo this entire room to fit your old one. Why don't we get you dressed up?" Dash said. She pulled out a onesie from undeneath the changing table. The body was sky blue and the sleeves were adorned with rainbow-colored stripes. Dash undid Scoot's binds to the table. As much as she wanted to run, she couldn't. She couldn't leave her mother. It wasn't right. She just had to wait.

"Don't you look cute in that onesie, Scoots? Also, you are gonna have to use that diaper: I locked all of the bathrooms. Hold on, let me fix you something to eat," Dash remarked, and trotted out the door.

As Rainbow Dash left, Scootaloo felt a weird feeling in her nether region that she didn't enjoy. She had to use the little filly's room. Badly. She considered her options: she could either hold it for the rest of the day, which seemed impossible, or she could actually use the diaper. She gave up, and let it all go in her diaper. When she was finished, she noticed that it was much warmer and softer. Curiosity bested her, and Scootaloo ended up playing with her wet diapers.

Rainbow Dash came back upstairs, and she smiled and giggled. "I see you're enjoying your diapers, Scoots?"

Scootaloo nearly peed herself again when she heard that. "Ye-No! I don't like these! Get 'em off!" she exclaimed.

"How about this: if you call me 'Mommy,' then I'll change you," Dash replied.

"I-I can handle the diapers, and I'm still miles away from calling anyone 'Mommy'," Scoots remarked.

"Alright. Come downstairs: it's time for breakfast," Dash said. Scootaloo got up, and the diaper made a particular crinkling sound when she moved, and Scoots cringed. However, she was promised with redoing at the end of the day, so she just had to tolerate it. She followed Dash down the stairs.

~~~~~

When Scootaloo got to the dining room, she was confused (also worried). "Where are all the chairs?" she asked.

"There's a high chair for you, baby," Dash added. Scootaloo made no attempts to resist; she couldn't, anyway.

"I also have a special something for just such an occasion," Dash said as she pulled out a bib. She applied it to Scootaloo, who looked at it with dull eyes.

"I made some oatmeal for you," Dash said.

"Oatmeal sounds good," Scootaloo replied. Dash brought out a bowl of warm oatmeal and proceeded to feed Scootaloo herself (Scoots glared at the spoon, implying that she'd rather do it herself).

"Open your mouth for the train! Choo-choo!" Dash giggled. Scootaloo did just that, and the oatmeal was prepared perfectly. The process was continued until all the oatmeal was in the orange filly's stomach.

"Looks like you dropped some, silly filly! It's a good thing that bib is there," Dash replied as she scooped up the remaining bits of oatmeal and fed them to Scoots. Then Dash went over to the fridge and pulled out a foal's milk bottle. Sure enough, it contained milk.

"Oh, no," Scootaloo thought. She had no choice but to purse her lips around the amber nipple and suckle as Dash picked her up, walked to a nearby couch, and began to coddle Scootaloo. The milk tasted surprisingly sweet, and before she knew it, Scoots began suckling the milk down mindlessly. Dash removed the bottle, and the suckling motion continued, prompting Dash to put a pacifier in Scootaloo's mouth.

"Hmm?" Scootaloo said as she came back to reality. Strangely, she didn't mind the pacifier all that much, perhaps because Dash would stop this nonsense by the end of the day.

"Come on, my little pony. Let's go back upstairs," Dash replied.

~~~~~

As Dash walked back upstairs, she noticed that Scootaloo was visibly beginning to break down, but for all she knew, Scootaloo was just playing along with the promise of freedom from this. Scootaloo saw a nearby teddy bear and began to cuddle it, and Dash pulled out her favorite board game. The two played several rounds together, and of course, Dash won every time (it's like she has a sixth sense for where the pieces are). Eventually, Dash pulled out a scrap book of her life as a foal.

"Awh, how cute," Scootaloo said. Rainbow eventually turned to a drawing, and she looked grown up in this, and is coddling Scootaloo, and when Scoots saw a page that marked "seven years," she made a run for the door.

"Dash, this is sick! You're gonna baby me for that long?" Scootaloo exclaimed.

"Well, like I said, I am your new mother, and I figured that you can start off as all ponies start off," Dash explained.

"But I'm nine! Just because I'm your new daughter doesn't mean..."

Then something happened that never crossed the orange pegasus's mind: she messed her diapers. She wasn't given warning, it just happened as if it were as natural as breathing. One second, she's arguing, the next, she's filling her diaper. Scootaloo reached behind herself and patted her diaper, prompting a squishing sound. She sat down in her messy diaper and began to cry.

"Those laxatives in the milk worked out," Dash thought.

"Dash, please change me," Scootaloo cried.

"Just call me 'Mommy,' and I will change you," Dash replied.

"...I-I..." Scootaloo choked.

"Hmm?"

"Mommy, I want you to change my diapees."

Rainbow Dash accepted this and picked her filled filly up and onto the changing table. She undid the onesie, undid the messy diaper, and threw it away. She used some baby wipes and cleaned Scootaloo's nether regions. As each wipe continued, Scootaloo felt more at ease, as if each wipe was clearing away any doubts or fear in her mind. Dash pulled out a new diaper and applied it to Scootaloo. That did it. Everything that passed that day was in an effort to break Rainbow's protege and daughter, and the drawings in her scrap book may actually come true. Scootaloo quickly sat up and patted her new diaper, sticking her pacifier in her mouth and smiling.

"How do you feel, my little pony?"

"I feel amazing, mommy!"

"I love you, my little filly."

"I love you too, mommy!"

From that day forward, Scootaloo would never again be obsessed with earning her cutie mark, as it just appeared, anyway: a diaper. She'd never do death-defying tricks on her scooter now; that didn't matter anymore. She would always be Rainbow Dash's little foal, and nothing less. Perhaps someone would discover Scootaloo's new mental state eventually, but that wasn't important. All that was important to Scootaloo anymore was diapers, games, baby clothes, and Rainbow Dash as a mother.

The End

Author's Note

Told you its layout is similar to Pattycakes, mainly because I find Pattycakes to be the ultimate Padded Pony story.
Hope you enjoyed!