Author's Notes:

Rainbow Dash is wearing her usual skintight black shorts under her skirt, Indigo is wearing a short skintight pair of dark purple shorts and a matching midriff tank top, and Applejack is wearing jeans today.

Also, here Indigo isn't like she is in The Adventures of Smelly Rainbow Dash

This one might be a bit rushed even compared to my other chapters. Also I was a bit nervous about submitting this one even though it's hardly my first like this.

"Rainbow Dash wins!" said Applejack as Rainbow Dash crossed the finish line seconds before Indigo Zap.

"No fair! You ALWAYS win!" said Indigo Zap, frustrated at losing again.

"Maybe I'm just more awesome than you!" said Rainbow Dash.

"Prove it!"

"How?"

"We'll have Country Girl over there tie us up. Whoever asks her to untie her first loses."

"You're on!"

"This should be interestin'," said Applejack.

...

Rainbow Dash and Indigo Zap were sweaty and thirsty from their race so they drank a lot of water, and a can of soda. Then Applejack led them to her barn. She tied Rainbow and Indigo's hands behind their backs, and tied their feet together. Then she set them in a position facedown.

"The contest has begun!" said Applejack, patting both their butts lightly.

They stayed still for an hour straight. Neither showed any sign of letting up. Occasionally they'd look sideways at each other to give each other a smug look, or else see if their opponent was showing any signs of weakness.

"Phew, it's hot in here," said Applejack. "Have some cider."

She gave them each three mugs of cider to drink. They both really appreciated this, for they were thirsty.

Another half hour later, Applejack gave them each another mug of cider.

A half hour later...

"I gotta go to the bathroom!" said Rainbow Dash.

"Are you giving up?" said Indigo, trying to hide that she also needed to pee.

"No way! You've probably got to go just as bad as I do!"

"I bet I can hold it longer than you!"

"You're on!"

Both girls became more uncomfortable as the minutes went by. They could feel their bladders filling up rapidly from all they drank before this competition and the cider they drank in the past hour. They couldn't help but fidget, which was all they could do because in their positions they couldn't hold themselves or cross their legs. Each hoped her opponent would give up fast to avoid the humiliation of wetting herself, but they seemed equally determined.

"This is ridiculous," said Applejack. "You should stop before you wet yourselves."

"Not a chance!" said Rainbow Dash and Indigo Zap at once.

"Suit yourself," said Applejack. A part of her had hoped they'd say that.

She offered them more cider after another half hour, and they couldn't help but drink it.

"Indigo... Give up! I know you can't last much longer!" said Rainbow Dash, sweating profusely.

"You mean YOU can't last much longer," said Indigo, trying to keep the desperation out of her voice.

Rainbow Dash whimpered as she leaked into her skintight shorts.

"Ha!" said Indigo, but she cringed as she also leaked a little.

Applejack stared as the two competitive girls tried their hardest to hold it in. Every few minutes their shorts would get damper, and sometimes a little pee would trickle down their legs.

"You all right there, Rainbow?" said Applejack, trying to hide how aroused she was.

"I'm fine!" said Rainbow. "I can hold it all day!"

"I can hold it all week!" said Indigo.

The prospect of holding it an entire week intimidated Rainbow a little. She leaked for six seconds, and tried to hold it. But the next leaks were longer, and then came one she couldn't stop. Rainbow Dash was peeing herself full force. She blushed lightly. She couldn't believe she was wetting herself at age 20.

Indigo could hear the sound of Rainbow Dash peeing and felt victorious.

"Ha! I win for once!"

Maybe she was excited at beating Rainbow Dash for the first time. Maybe she was relaxing too much from not having to beat Rainbow anymore. Maybe it was just the sounds of Rainbow Dash peeing. Or, maybe it was all three at once that made Indigo start to pee uncontrollably. She tried to stop, but her stream kept soaking her shorts and her legs.

"Ahhh, that's better." Rainbow Dash finished peeing, but she could still hear a hissing sound, and chuckled. "Looks like you couldn't hold it either."

"I still held it longer than you!" Soon Indigo finished wetting herself.

"Wanna take a break and change?" said Applejack.

"No!" said Rainbow and Indigo.

Applejack didn't really have a problem with this.

...

In another hour, it was lunch. Applejack cooked some beans for Rainbow and Indigo, who wolfed them down quickly and washed them down with cider.

Over the next hour, Rainbow Dash and Indigo Zap were farting repeatedly. And of course they were turning it into a contest.

"Hold on..." said Rainbow Dash.

PPPPPPPPFFFFFFFFFFFFFFFFRRRRRRRRT!

Rainbow Dash chuckled.

"13 seconds," said Applejack.

Indigo moved her behind slightly.

BBBBBBBBBRRRRRRRRRRRRRRT!

Her fart was deeper-pitched and louder, but Rainbow Dash was sure it was a little shorter.

"12 seconds," said Applejack.

They let out several more farts for the next few minutes, but none of them were that long, though many were loud and wet.

"Rainbow Dash wins!" said Applejack, slapping Rainbow Dash's butt.

"Hey, how come only she gets that?" said Indigo Zap.

"Oh. Why didn't you say so?" Applejack slapped Indigo's butt as well. It felt similar to Rainbow Dash's butt.

Over the next few hours, Rainbow and Indigo wet themselves again. This time they didn't try holding it, they just let it out when the urge got really powerful and they knew the other wouldn't stop.

Applejack served them more beans, and some hot dogs and prunes, leading to another farting contest. Indigo won this one with a 14-second fart.

...

The next morning when they woke up, they needed to pee. So they let it all out in their shorts, again.

An hour later, after Applejack served them oatmeal and cider, they felt an uncomfortable feeling in their bowels.

"I don't have to pee this time!" said Rainbow Dash.

"I... don't have to do either!" said Indigo, though her discomfort was clear.

They let out another series of wet farts, which got wetter and stinkier as the minutes went by.

"Wanna see who can hold it the longest?" said Rainbow Dash. "Or do you wanna give up now?"

"I could do this all week. And I bet I can hold it longer than you!"

They held it for a half hour, but they had to go really badly.

Rainbow Dash let out a sloppy wet fart and felt a bit of poop plop into her shorts. She whimpered, and Indigo knew what that meant.

"Aha! You couldn't hold it as long-"

PPPPPPBBBBBBLLLLRRRRRRT!

Indigo noisily made a big mess in her shorts. Applejack stared at the brown bulge that appeared on her butt. Indigo blushed.

"I held in most of it longer than you!" said Rainbow Dash, pausing to fart again. "I guess I win this contest!"

"No, I win!" said Indigo.

"Whatever." Rainbow Dash released the contents of her bowels into her shorts quieter than Indigo had, but the mess was a little bigger, and just as wet.

...

That night, they continued to lay in their wet, soiled shorts.

"Tired of being in this messy state?" said Indigo.

"Not even a little bit," said Rainbow Dash. She sniffed. "The smell is a bit much, but I can ignore it."

"I don't really mind the smell. Like I said, I could do this all week."

...

A week later, Rainbow Dash and Indigo Zap were still tied up in the barn, laying in a large puddle of pee. They smelled really bad, including their armpits due to having not washed after sweating in the summer heat for a week. Their shorts were overflowing with poop, even though every few days Applejack would set them into a sitting position to squish their messes under their rears. Day 4's dinner had given them diarrhea.

That morning, Applejack waited until Rainbow and Indigo simultaneously wet and soiled themselves further.

"All right, that's enough," said Applejack, who had enjoyed the show but knew it would never end unless she ended it. "It's pretty clear neither of you ain't gonna give up, so I'll call it a tie."

"Very funny," said Rainbow Dash, catching the unintended pun.

Applejack untied both of the smelly girls.

"Tie us back up again!" said Indigo. "We're not finished!"

"Yes you are," said Applejack. "You really need a bath."

...

Rainbow Dash and Indigo Zap sat fully clothed in the bathtub, which was full of soapy water. Applejack had to rinse them off first and get them to dump all the poop in their shorts into the toilet before filling the bathtub up.

"You weren't just stayin' there out of competitiveness, were you?" said Applejack as she scrubbed Rainbow Dash's back with one hand, and Indigo's back with the other.

"What's that supposed to mean?" said Rainbow Dash. Both she and Indigo blushed a little.

"You were really enjoyin' it, weren't you? I saw you wettin' yourselves two nights ago when you thought I was asleep, and your faces said it all."

Rainbow and Indigo's faces were beet red now.

"Promise you won't tell anyone," said Rainbow Dash.

"Ah promise," said Applejack. "Time to wash your dirty asses!"

Rainbow and Indigo chuckled a little and raised their butts in the air. Applejack poured extra soap on their behinds and scrubbed as hard as she could.