Ponyville. Golden Oak Library. Spike, the unicorn's assistant, was holding a book while she read it, a pot of dirt in front of her.
"Ok, I think I got it!" the librarian said.
"Um... What are you doing again?" the baby dragon asked, closing the book.
"I'm working on that age spell! If it works, the seed inside this pot will sprout!"
"Is it because of that Alicorn Amulet incident again?"
"Wh-Why would you think of that? I already got over that!" she said nervously while looking everywhere but in Spike's eyes.
The dragon crossed his arms, a scolding look in his eyes. "You're a terrible liar, Twilight!"
She sighed and lowered her head. "Sorry..."
"Look, Twilight! It's not that I don't trust your abilities, but that's that kind of magic that only an Alicorn can do! That's why it's called 'The Alicorn Amulet'!"
"But I am the Element of Magic, Spike! That kind of magic should be a walk in the park for me!"
"Well, whatever float your boat!"
Twilight smiled and lowered her head again. Her horn started glowing.

A few minutes earlier, the classes were over and the foals started leaving school.
"Don't forget to bring your homework!" said the teacher, miss Cheerilee, as they left.
Rumble, Shady Daze and Dinky Hooves trotted side by side.
"I don't know how to start!" Rumble said. "I don't know anything about Equestrian history!"
"Mom has a few history books at home!" Dinky said.
"Really?" Shady said, surprised. "I'd never believe your mother is an egghead!"
Dinky bounced happily. "Mom loves to read!" she stopped bouncing and looked down sadly. "But everypony thinks she's dumb because of her eyes!"
"Oh! Sorry about that!"
"It's ok!"
"Since your mom has history books, can we make our homework together?" Rumble suggested. "We could even make a group presentation!"
"I'd love that, but mom deslikes when I bring ponies over when she's not home!"
"Ponyfeathers..."
"But you two could go to the Golden Oak Library! There are many books in there!"
"Hey, you're right!" he flapped his wings and trotted a little faster. "Let's go, Daze!"
"Nah, you go first!" Shady said while stretching. "I'll take a nap first and do the homework later!"
"Well, ok then! See you tomorrow!"
"Bye!" Dinky said, smiling and waving her hoof.
"See ya, Rumble! See ya, Dinky!"
"Don't oversleep and forget to do your homework! Again!"
"Yeah, yeah!"
They bid farewell and parted ways.

Twilight smiled and lowered her head again. Her horn started glowing.
Rumble opened the library's door and entered quietly, but he didn't measure his force when closing it, accidentally slamming the door.
The sudden loud noise startled Twilight, that jumped and yelped, accidentally casting the spell.
The magical beam hitted the wooden wall and was reflected, hitting the young colt that only noticed the purple ray when it was too late.

Rumble opened his eyes. His vision was blurry, but soon adjusted. He wasn't lying on the hard wooden floor of the library, but on a white and fluffy cloud.
"Where... Am I?"
He looked around and noticed he was in the middle of a city on the clouds.
"This place is strangely familiar!"
Rumble heard a gasp coming from behind him, but when he turned around, there was nopony there. But then he noticed a frost blue tail coming from behind a cloud lamp post.
The young colt approached and saw the owner of the tail: a light violet filly with a frost blue spiky mane lying on the ground and covering her eyes with her hooves.
"Um... Hello?"
The filly jumped and yelped. She turned around and saw the light grey colt. She tried hiding her purple eyes behind her mane, but to no avail.
"Can you tell me where I am, please?"
But she remained silent. The filly only looked down and started digging the cloud with her hoof.
Rumble cleaned his throat, startling her.
"Sorry, but I don't think you heard me, so I'll ask again! Where... Where am I?"
The filly took a step back and whispered something.
"Sorry, what?"
She shrinked and whispered again. Rumble recognized the word "cloud", but nothing else.
"Could you speak just a little louder?"
The filly curled up and hid her face between her front hooves. Rumble scratched his head.
"This is going nowhere..."
"Hey!!" called a voice from not too far away from there. He looked around and saw another filly. She looked like the one curled up in front of him, but with straight mane with a pink bow on it and flying toward him. Fying fast.
"Nopony bullies my sister!!"
Rumble tried dodging, but he wasn't fast enough and the second filly tackled him to the cloud. He tried getting up, but she pinned him to the cloud.
"F-Flitter!" the first filly finally said something.
Even though the filly was smaller than Rumble, she was somehow stronger. He couldn't get up.
"Why was you bullying her?!"
"I-I-I wasn't b-bullying her!"
"You lie!!"
"It's true! Ask her! I'm innocent!"
"Was he bullying you, CC?"
The first filly shook her head. Flitter's gaze softened and she helped Rumble up.
"Sorry! Everypony bullies CC because she is really shy and it's my duty to protect her, so when I saw you standing in front of her and she with her face buried on her hooves, I assumed... Sorry!"
"No worries, it's ok!"
"Who are you? I've never seen you around here!"
"I'm Rumble! I'm from Ponyville!"
"Ponyville? Never heard of it!"
"It's a little town from the land!"
"Figures! Anyway, welcome to Cloudsdale! I'm Flitter and this is my big sis, Cloudchaser!"
"He... Hello..." Cloudchaser whispered.
"Wait! Flitter and Cloudchaser?"
"Yes! You heard of us?"
"Yes! I mean, no! I mean, not exactly! I know a Flitter and a Cloudchaser, but they're grown up mares that work on Ponyville's weather team! They're sisters too, and... I just noticed that you look a lot like them!"
"Really? Crickey..."
"Flutter!! CC!!" called a male voice. They looked around and found the source of it: a dark grey colt with frost blue mane and golden eyes.
"Thunderlane!" Flitter said with a smile before trotting toward him, Cloudchaser following her.
"Thunderlane?!" Rumble thought, astonished.
"Great news!" he said. "Mom came back home with my brother!"
"So it's a colt?" Cloudchaser asked. Thunderlane nodded happily. "Delightful! Can we go visit them?"
"Of course! Just don't make too much noise! Rumble deslikes too much noise!"
"Rumble?" both fillies said at the same time.
"Yes, that's his name!"
They looked back, but saw nopony.
"Something wrong?"
"No, it's just..." Cloudchaser started.
"We were talking with a colt a moment ago, and his name was Rumble!" Flitter finished.
"Weird!" he said. "Anyway, let's go! I want you to meet my brother!"
Rumble watched from behind the cloud lamp post as the three foals trotted away.
"Let's solve this puzzle!" he thought. "I saw a purple glow, and then I woke up in Cloudsdale! I met two fillies with the same name and appearance of my friends Flitter and Cloudchaser, and a moment later a colt with the same name as my brother and that looks a lot like him appears and talk about his probably newborn brother called Rumble There's only one reasonable explanation!"
"The librarian sent me back in time!"

Author's Notes:

I used to update C.A.C.T.S.A.T. (Crashes And Crushes Through Space And Time) once a week! I'll try to update A.R.I.T. (A Rumble In Time) more often! Again, I want to apologize about my grammar...
((Before you ask, yes, I love time travel!))