Rarity woke up one morning. She felt her pajama shorts. They were wet. She had wet the bed again. She giggled lightly, and looked to her side. Rainbow Dash was still sound asleep. Rarity let out a loud fart, which woke Rainbow up.

"What? What was that? Oh, good morning Rarity." Rainbow fidgeted a little. "I have to pee like a race horse!"

"So then pee right here," said Rarity.

Rainbow Dash peed full force in her pajama shorts, sighing in relief and taking pleasure in the warm wetness as it drenched her shorts and further soaked Rarity's bed. She farted in the middle of peeing.

When Rainbow was done wetting herself, they cuddled in their wet state for about half an hour before taking a bath the same way they always did together. Then they changed into their new daytime outfits - Rarity's skintight black unitard, and Rainbow Dash's skintight black pants, with gray boyshort panties underneath. Then they had breakfast and each drank a large cup of coffee.

"So what do you want to do today?" Rarity asked.

"How about I tie you up?" Rainbow suggested.

"Ooh, that sounds like fun."

Rainbow Dash poured two glasses of soda with fart powder in it. She drank one, and Rarity drank the other. Then Rainbow refilled Rarity's cup four times, all of which Rarity drank.

"Do you want to use the bathroom before I tie you up?" Rainbow winked.

"No thanks, I'm fine." Rarity also winked.

Rainbow tied Rarity's hands behind her back. Rarity sat down on the floor, and Rainbow tied her feet together. She sat down close to Rarity so they could have a fun conversation. Rarity struggled against her bonds, but Rainbow had tied them tight. Rarity rather enjoyed this, and she knew it was going to get more fun from here.

Then, a boisterous wet fart erupted out of Rarity's butt. "Ooh... What did you put in that soda?" Rarity asked with amusement.

"Fart powder," said Rainbow. "In every one. Including mine." She lifted her leg and let out an equally loud, equally wet fart.

"I imagine I'll be farting five times as much as you," said Rarity. BBBBBBBBBRRRRRRRRRRRRRRRRRRT! She blushed lightly at this long, deep-pitched fart, but giggled.

"Nice one, Rarity," said Rainbow Dash. BRRRRAAAAP! "But I'm probably the most flatulate girl around."

"Oh, I don't know about that." Rarity let out a series of short, loud, wet farts, giggling as she stunk up the room.

Rainbow Dash positioned her butt in Rarity's face and let out a long, loud, wet fart. Rarity was really excited about this. Rainbow's butt looked so cute in those pants, and farting in her face made it even better! She felt so dirty for thinking this, but she liked it. She inhaled deeply. Rainbow's farts smelled just as foul as her own, but coming from her, she loved it.

After a half hour, Rainbow's farting subsided, but Rarity kept farting, stinking up her unitard.

"You were right," said Rainbow Dash. "You are more flatulate than me. I guess you can't be a lady all the time, Miss Farty Pants!"

Rarity giggled and let out another explosive wet fart. She usually wanted to be clean and ladylike, but she liked being dirty around Rainbow Dash.

About another half hour later, Rarity said "I have to go to the bathroom." She fidgeted where she sat, struggling against her bonds.

"Just hold it," said Rainbow Dash with a wink.

Rarity continued to squirm as her desperation grew more and more urgent. Soon she could not sit still. She needed to pee really badly, but in her position she couldn't cross her legs or hold herself. Every few minutes she would fart accidentally. "Can you untie me? I REALLY need to go!"

"Too bad, you're staying right there. If you have to pee that badly, just go in your unitard."

Rarity tried hard not to smile. Rainbow was saying everything she wanted her to, and she knew Rainbow was enjoying the show she was putting on. It was all she could do to keep from wetting herself out of excitement. It wasn't as though she hadn't held to bursting point before, but then she always had the option to go if she wanted to. Now she was completely helpless, and unable to do anything but fidget. Well, they did have a safeword, but Rarity had no intention of using it now, nor had she ever needed to. She wanted to make this last as long as possible.

After another half hour of Rarity's desperation, which both girls enjoyed, and during which Rainbow Dash drank some more soda, starting to feel an urge herself, Rarity leaked a little.

"Ooh! Rainbow Dash! I can't hold it! I'm going to wet my unitard! Can I PLEASE go to the bathroom?"

"Yes you can," said Rainbow Dash. "Right there, in your clothes."

Rarity fidgeted harder, until she couldn't hold it anymore. Rarity peed in her unitard full force. A puddle grew rapidly around her, and she sighed in relief and almost orgasmic pleasure. Rainbow enjoyed the sight of this too. Rarity peed for over two minutes, and then stopped, sitting in her puddle. "Ahhh, that's better." She let out a sputtering wet fart.

"You've been a naughty girl, peeing yourself like that," said Rainbow Dash. "You need a spanking." Rainbow put Rarity over her knee and spanked her ten times. With each swat, Rarity let out a squeal, and droplets of pee flew from her soaking rear end. Then Rainbow set Rarity back in her puddle.

Soon, Rainbow's need to pee increased, and she crossed her legs and fidgeted. "I have to pee SO BAD!"

"You're staying right here," said Rarity. It didn't make much sense for the one who was tied up to force the one who wasn't to stay here and not use the bathroom. But, it was their own kinky game, they played it how they wanted.

"But I REALLY have to pee!" Rainbow whimpered, fidgeting hard with a pained expression on her face.

"You're using those pants as your toilet until dark," said Rarity.

"If that's the case... Lay on your back."

Rarity did as she was told. Her puddle soaked the entire back of her outfit. Rainbow Dash stood over Rarity and squatted above her chest. She was facing away from Rarity's head so that Rarity got a nice view of her butt. Rarity would have slapped it if her hands weren't tied. Rainbow released a stream nearly as strong as a hose, which passed through her pants in seconds and splashed all over Rarity. Rarity shuddered with pleasure and excitement as Rainbow peed on her while simultaneously wetting her pants. It was very warm and wet and she loved this even more than a regular shower. She couldn't help but empty her bladder of what had gone through her since her wetting earlier today.

Rainbow peed for over two minutes before she was finally done. Rarity was a little disappointed when it was over. Her outfit was completely soaked in pee, both Rainbow Dash's and her own, and smelled strongly of pee and farts.

Speaking of which, Rarity let out a loud, boisterous, sputtering fart, laying in their puddle. Rainbow chuckled, then set Rarity in a position so that her head was down and her rear end was in the air. Rarity had her head on its side, soaking her hair. Rainbow positioned herself next to Rarity's butt and rubbed it a little with her hands. It looked so sexy in that skintight unitard, and more so soaked with pee.

PPPPPPBBBBRRRRRT! BRAP! FLART! PPFFFT! BBBBBBBRRRRRRRRRRRT!

Rarity let out a flurry of wet farts in Rainbow's face. Rainbow could feel the warm breeze against her face and sniffed deeply, patting Rarity's butt lightly after the long, deep-pitched fart.

"Ooh... This is REALLY unladylike," Rarity said with a smile on her face.

"You can say that again, Miss Pissy Farty Pants!" Rainbow slapped Rarity's butt playfully, which made her fart again. FFFFRRRRT!

This went on for several minutes, until Rarity's farts grew wetter and stinkier.

PPPPPPRRRRRRRRT!

"Phew, Rarity! You all right?"

"I may need to use the bathroom soon." *bbbrrrrrt*

"Well, you're wearing your toilet."

Rarity let out a fake moan of discomfort and fidgeted in her position, releasing wet fart after wet fart in Rainbow's face.

PPPPPBBBBBBRRRRFFFFPPPRRRTT!

"Ooh... that sounded wet." Rarity giggled.

"Be careful you don't soil yourself," said Rainbow.

Rarity let out another boisterous wet fart, and felt a bit of poop plop into her light blue panties. "Oh my," she said.

"Yeah, you messed yourself a little." Rainbow chuckled and patted Rarity's butt again.

Rarity continued to hold it, farting every few seconds. Then she let out a little more hyperscat. Then...

FFFFFBBBBLLLLLAAAARRRRRRPPPPPBBBRRRRRRT!

Rarity noisily released a wet, smelly brown mess into her unitard. It was hyperscat, so a lot came out at once. Rainbow saw the brown bulge form on Rarity's butt. Rarity sighed in relief.

"That really smells," said Rainbow Dash. But she inhaled deeply through her nose.

Rarity giggled. "I mean... Oh no, my outfit is ruined! I need to be changed!"

"First you'll sit in your mess until I go." Rainbow put Rarity back in a sitting position. Rarity felt her mess squish under her. She wiggled her butt around and giggled. She let out a sloppy wet fart, soiling herself further. BLART!

Rainbow Dash ate a prune. Pretty soon, a series of wet farts were making their way out of her. Rainbow quickly got Rarity laying facedown. Rarity's butt looked as though she had sat in a mud puddle. Rainbow sharted herself a little before she sat on Rarity's butt. A short, explosive wet fart made its way out of her, and Rarity giggled at the feeling of Rainbow's butt vibrating against her own.

Then Rainbow filled her pants with hyperscat, sighing of relief. Rarity could feel the mess forming in Rainbow's pants and giggled, enjoying the sensation. Rainbow wiggled her butt against Rarity's, feeling her mess squish under her. She let out another sloppy wet fart. PLORP! "Oops... I soiled myself a little more." She chuckled.

Eventually, Rainbow said "How about I untie you and we have some lunch?"

"That sounds lovely," said Rarity, sounding as ladylike as she could despite the filthy state she was in.

Rainbow untied Rarity. She didn't bother asking whether she wanted to clean up - she already knew the answer to that. Rainbow made some lunch for her and Rarity, some of which would make them fart and/or poop more. They each drank a can of soda, then sat at the table in their wet, soiled state drinking lots of tea.

They continued to have fun, farting constantly, and whenever they needed to pee or poop, they just went in their pants.

Then, when night came, they washed each other in the bath, spending over five minutes scrubbing each other's butts, and changed into their pajamas.

Rarity wet the bed again that night, and laying so close to Rainbow Dash, this made her wet the bed too. When they woke up, they felt an urge to poop. So they soiled their shorts, giggling the entire time. They cuddled in this state for an hour before they walked to the bathroom to wash each other.