Author's Notes:

This is probably the single stretchiest story I've written, and one of the three most extreme. So, again, please don't take seriously at all, and this was done by request.

At the request of another, I changed the ending slightly.

Today at Canterlot High, the students would be practicing javelin throws.

Principal Celestia and Vice Principal Luna were going to watch it, and Rainbow Dash had a very naughty idea of a prank to pull on them.

Rainbow Dash got four cups of cider, and spiked two of them with laxatives. As she made her way toward Celestia and Luna, Pinkie Pie jumped out and surprised her. She nearly dropped all four cups, so she set them on the ground and listened to the random things Pinkie had to say.

Once Pinkie walked away, Rainbow picked up the cups.

"Hey," said Rainbow once she reached Celestia and Luna. "I thought you might be thirsty, so here's some cider!"

She gave Celestia and Luna the two cups she thought were spiked, and drank the other two very quickly. As Celestia and Luna drank their cider, Rainbow chuckled.

Near the end of the class, it was Rainbow Dash's turn to throw the javelin. As she stepped up, she let out a loud fart. The other students laughed, and Rainbow blushed lightly.

As she picked up the javelin, she farted several more times.

"Uh-oh! I might have drank the wrong cider!"

Celestia and Luna heard this and looked at each other.

Rainbow Dash threw the first javelin with difficulty. She let out more wet farts as she threw the second javelin. As she picked up the third...

PPPPPPPPBBBBBBLLLLLLLLRRRRRRT!

Rainbow blushed beet red as she released a big, wet, smelly mess into her skintight black shorts. The hyperscat came out for five seconds, and the mess was so big and so wet that it began to leak out her shorts and go down her legs. At this, everyone began laughing really hard.

Twilight, Sunset, Applejack, Fluttershy, and Rarity weren't laughing, but Pinkie was laughing her butt off.

Rainbow stood there in total humiliation before the bell rang for lunch, and she ran to the bathroom to clean herself up.

...

Although Rarity felt bad for Rainbow, she was disgusted all the same and hoped she could forget about this event.

She walked to the cafeteria, as she would always eat lunch first and then use the bathroom.

After she got her plate of food, she started to walk to the table that her friends were sitting at, but Trixie blocked her path.

"Guess what, Rarity? The great and powerful Trixie has stolen the designs for your dresses!"

"So you're the one!" said Rarity, furious.

"I'll make sure you will never work in fashion again unless you do whatever the Great and Powerful Trixie says!"

"What do you want?"

"I want you to wet yourself. Right then, right here!"

"That's revolting! I'd never do that!"

"Have it your way. You can forget about your fashion career!"

"Fine."

Rarity closed her eyes and began peeing, flooding her purple panties, and wetting the front of her purple skirt. The pee flowed down her legs and formed a puddle at her feet.

All around people noticed her and began to laugh. Rarity blushed with embarrassment. She could not believe she was doing this.

When Rarity finished peeing, Trixie said "Rarity peed in her dress! She needs a spanking!"

"I beg your... Ooh!"

Trixie sat down on a nearby table, put a towel over her lap, then put Rarity over her lap, pulled up her skirt so her wet, purple panties were exposed for all to see, and spanked her ten times. Rarity squealed with each swat. It didn't hurt that bad, but the real pain was in her humiliation, as just about everyone in the cafeteria was laughing at her.

"Trixie has something for you before next class," said Trixie as she walked away.

Rarity sat down next to her friends. Pinkie couldn't help but giggle, and Applejack hit her in the head with a newspaper. "That's the last thing she needs right now."

They ate their lunch, but Rarity was too ashamed to enjoy it, though Sunset, Applejack, and Fluttershy tried to comfort her.

Rainbow Dash sat down next to them. She had cleaned out most of the mess in her shorts and flushed it down the toilet, but her shorts were still very dirty and smelled really bad. The girls' disgust was clear, but they didn't tell Rainbow to leave, as they thought it would only make her feel more ashamed of her accident.

As there were five minutes left before the end of lunch...

*brrrrrrt*

Rainbow Dash farted and soiled herself again. She got up and ran back to the bathroom.

...

Rarity was about to walk into English class, when Trixie stood at the doorway.

"Drink this," she said, holding out a bottle of water. "All of it. Or your fashion career is over!"

Rarity drank the bottle of water, and got into class. The class stifled some chuckles at the sight of her wet skirt.

Only five minutes into the class, Rarity felt an uncomfortable feeling in her bowels. Trixie must have put fart powder in that water bottle - and a lot of it, for she had never been so gassy.

After two more minutes, she couldn't hold it anymore.

FFFFFFFRRRRRRRRT!

Rarity blushed, and the other students started to laugh.

"Rarity!" said the teacher. Rarity just giggled nervously, and the teacher shrugged it off and went back to the lesson.

Almost immediately after, Rarity felt that same pressure, and let out an airy fart. It was only audible to those sitting closest to her, but it smelled really bad. Then came a louder, wetter fart.

For the next ten minutes, Rarity let out a flurry of wet, boisterous farts, and the teacher, looking very annoyed, opened the window. Rarity had never been so embarrassed in her life. First she was forced to wet herself, now she was farting in front of the whole class.

Five minutes before the end of class, Celestia's voice could be heard on the announcements.

"Attention everyone! Next class there is going to be an assembly."

...

As soon as everyone was assembled in the auditorium, Celestia spoke into the microphone.

"Would Rainbow Dash come onstage?"

Rainbow reluctantly stood up and walked toward the stage.

Rarity farted loudly, and blushed while everyone laughed.

Rainbow reached the stage.

"Today," said Celestia to the audience, "Rainbow Dash tried to prank me and Vice Principal Luna by giving us cider with laxatives."

"It backfired on her," said Luna, "but we must make sure she doesn't try it again."

"I think I already got my punishment for that," said Rainbow, feeling very uncomfortable, not only because she was standing in front of an entire audience in her soiled shorts, and was reminded of her messy accident, but also because she needed to pee rather badly. Those two ciders had gone through her and she hadn't peed since she was too focused on cleaning up the mess in her shorts and panties.

"Well, we still have to punish you for it," said Celestia. "Luna, you go first."

"Wait, what?"

Luna sat down in a chair on the stage, putting Rainbow Dash over her lap. It only now occurred to Rainbow that both Celestia and Luna were wearing rubber gloves, and she realized what they were about to do. She kicked her legs helplessly.

"Can't you give me detention instead?"

Luna responded by slapping Rainbow's dirty butt. Because most of the mess had been cleaned out, this hurt quite a bit. Luna spanked Rainbow nine more times, in front of the entire school, much to their amusement, and Rainbow's embarrassment.

"Are we done now?" said Rainbow, blushing profusely, and crossing her legs, for she really needed to go.

"It's my turn now," said Celestia, and she put Rainbow over her lap.

"Can you please stop? I have to pee really... OW!"

Celestia slapped Rainbow's behind harder than Luna could. After the fifth swat, Rainbow started to tear up from the pain and humiliation, and after the ninth swat, she started peeing uncontrollably.

Celestia froze after spanking Rainbow the tenth time. Rainbow had never been so humiliated in her life. She was now peeing in her already-soiled shorts, all over Principal Celestia. And, her butt hurt a lot from the spankings.

After 30 seconds, Rainbow finished wetting herself.

"You peed on me," said Celestia. "You know what this means, Luna."

Luna pulled out a box of diapers. Rainbow tried to run but Celestia held her down as Luna pulled off her wet, soiled shorts and her dark pink miniskirt, and put the diaper on her.

"You have to wear this until the end of the school day," said Celestia. "Then come back to our office and we'll change you. That will be the end of your punishment."

"What do you mean, change me?" said Rainbow Dash.

"Your diaper will not be clean by the end of last class," said Luna. She opened ten cans of soda and sprinkled some laxatives into each one. "Drink all of these right now."

Rainbow Dash moaned.

"I think a detention would have sufficed," said Twilight.

...

The last class of the day was history class. Rainbow Dash sat in her diaper the entire class, often getting looks, chuckles, and sometimes teasing from her classmates.

Rarity, meanwhile, was still extremely gassy, and was farting loudly every few minutes. The teacher had to open the window like before.

Only fifteen minutes into class, Rainbow Dash peed in her diaper, and then released a wet brown mess into it.

"Aw, did the baby mess her diaper?" said one of the boys while the girls next to him giggled.

Rainbow Dash had to sit in her wet, soiled diaper for the rest of the class, while Rarity was equally humiliated from farting so much.

...

As Rarity walked out of class, Trixie pulled her closer to her.

"One more thing before you go home," said Trixie. "Follow the Great and Powerful Trixie!"

Rarity did as she was told, and Trixie led her to a bathroom.

Applejack watched suspiciously.

Once inside the bathroom, Rarity saw about twenty girls standing there. Rarity knew most of them were friends with Trixie.

"You will sit on that toilet and let these girls do whatever they want to you!"

"Haven't you had enough?" said Rarity.

"The Great and Powerful Trixie will go first!" Trixie turned around, raised her butt in Rarity's face, and farted loudly. Rarity cringed at the stench. Then Trixie dunked Rarity's head in the toilet and flushed.

One by one, the other girls farted in Rarity's face and gave her swirlies. Some of them wiggled their butts in front of Rarity's face before farting.

PPPPPPFFFFFFFFRRRT!

Rarity gagged at the smell of the fifth fart. After the girl with the jeans gave Rarity a swirlie, the sixth girl, who was wearing skintight black shorts, stuck her butt so close to Rarity's face it was almost touching it.

BBBBBRRRRRAAAAAAAP!

The smell was overpowering now, and Rarity almost threw up. Seventh was Diamond Tiara, eighth was Silver Spoon.

PPPPPFFFFFFFFT! *Flush* PPPPPPRRRRT! *Flush*

On her tenth swirlie, Rarity wet her panties again. On her eleventh, she soiled herself, making a big mess in her underwear, causing everyone to laugh harder.

PPPPPBBBBBRRRRT!

After the last girl, who wore a yellow mini skirt, farted in Rarity's face, Rarity fainted from the smell. She instantly woke up when her head was dunked in the toilet.

...

Rainbow Dash blushed with embarrassment as she lay on a changing table. Why it was in Celestia's office, she didn't know. Luna removed her very dirty diaper, and put on her wet, dirty, very smelly shorts, and put her skirt back on over it.

"Are we done now?" said Rainbow Dash.

"We are done," said Celestia. "Unless you try to do that again."

Rainbow walked out of the office and walked home. It started to rain hard. Rainbow didn't mind. A walk in the rain seemed perfect considering this situation. It at least made her shorts less dirty and smelly before she got home.

Rarity felt the same way. Her hair was already wet anyway, and the rain was cleaner than the water in that toilet. She had cleaned up as best she could after Trixie's girls were through with her, but her underwear was still dirty, and she was still farting every once and a while.

...

Later that night, it had stopped raining. Rarity had taken a shower and changed into a light blue tank top and a short, fairly tight pair of purple shorts. She was shopping at the mall when she ran into Trixie in the middle of a crowd.

"Not you again," said Rarity.

"One more thing and Trixie will return your designs."

"What?"

"Wet yourself and mess yourself again. Right here, right now!"

Rarity moaned, and released the contents of her bladder and bowels into her shorts. People stared and laughed as her shorts grew wetter, pee pouring down her legs and forming a puddle, as a brown bulge appeared at the back. Rarity blushed, feeling ashamed beyond belief once again.

Trixie gave Rarity her designs back. "Don't think this ends here! The Great and Powerful Trixie will steal them again if you don't do what she says forever!"

Rarity whimpered, wetting herself a little more.

"There'll be no more of that," came a country voice. Rarity and Trixie turned to see Applejack. "Ah know what you've been doin', Trixie. If you do anything like that to Rarity again, you'll regret it."

"Save your empty threats for later," said Trixie. "The Great and Powerful Trixie needs to use the bathroom!"

Applejack tickled Trixie's sides and armpits. Trixie started to laugh, and before long she was peeing in her purple skirt and white panties. The crowd saw this and laughed at her too.

"And there's more where that came from," said Applejack.

"All right," said Trixie. "I won't do it again!" She threw a smoke bomb and ran away.

Applejack walked Rarity back to her house and she changed into one of her other dresses after taking another long shower. Rarity started to feel better after having dinner with Applejack. By now her farting had subsided, much to her relief.

...

Rainbow Dash, meanwhile, sat on her bed for the rest of the day, thinking about all the embarrassing things that had happened today, all from one failed prank. She wet her pajama pants twice before eventually growing tired and falling asleep, on top of the covers.

...

For a few weeks, Rainbow Dash and Rarity were the object of teasing and ridicule, except from their friends, though Pinkie Pie laughed every time someone brought it up, until she was reminded by Sunset that she had wet her jean shorts from laughing too hard at Rarity farting during the last class. Which Rainbow and Rarity hadn't noticed before.

But, by the end of the month, everything was eventually forgotten, and Rainbow Dash and Rarity could put these horrible experiences behind them. Except for one moment each.

Rainbow Dash got Pinkie Pie to trigger a device to pull Celestia and Luna's pants down at another assembly, and sneak fart powder in their tea so they were farting the entire time (how Pinkie accomplished either, Rainbow didn't know), and the audience laughed at them. Beyond this, Rainbow never attempted to prank them again, and a week later, they apologized to her for giving her such a harsh punishment and said they'd give her detention in the future. They did not suspect her, for they had kept an eye out for any more of her pranks.

And Rarity got her final revenge on Trixie. After Applejack tricked her into drinking a lot of cider and some prune juice at break, Trixie ran into the bathroom in the middle of lunchtime, where Rarity was waiting for her. Rarity gave her a swirlie, causing her to wet herself and mess herself at once. Then she dragged her to the cafeteria by her feet, where the students could see her and laugh at her.

Trixie never tried to blackmail Rarity again.