Author's Notes:

Another short chapter, but at least longer than the last one. I wanted to swap their positions from the Bondage chapter.

"Rarity, I have to go to the bathroom!"

"You're staying right there, Rainbow Dash."

"But I gotta go real bad!"

"You'll just have to hold it."

Rainbow Dash was sitting with her arms tied behind her back and her feet tied together, and she was fidgeting, for she needed to pee really badly. She had drank a lot of soda and tea, and was wearing her skintight black pants.

Rarity sat in front of her, wearing her skintight black unitard, which smelled a little from farting in it a lot earlier today.

Speaking of which, Rarity felt another fart coming. She positioned her butt in Rainbow's face and let loose with a loud, deep-pitched fart. BBBBBBBBBBBRRRRRRRRRRRRRT!

Rainbow nearly wet herself with excitement. She sniffed deeply. She wished she could slap Rarity's butt, but at the same time she enjoyed being tied up really needing to pee.

Half an hour went by. Rainbow Dash's bladder became even more full, and she started squirming harder, unable to hold herself or cross her legs.

"Rarity! I can't hold it! I'm gonna wet my pants!"

"Like I did when I was tied up?" Rarity winked.

Rainbow smiled slightly, remembering the event, then returned to her fidgeting with a pained expression on her face, trying to hold it and feeling waves of pee sloshing inside her.

Eventually, Rainbow's overflowing bladder gave out. She sighed in relief as she started to pee like a race horse. Her crotch and butt were soaked in seconds and a puddle formed rapidly where she sat. She let out a sigh of relief and pleasure as she wet herself.

Rarity giggled at the sight of this. She never got tired of seeing Rainbow Dash pee in those sexy skintight pants.

Rainbow peed for over two minutes, then sat there, her bladder empty, her pants soaking wet, and feeling satisfied. She let out a sputtering wet fart in her puddle, and chuckled.

"How very unladylike of you, wetting your pants like that," said Rarity. "You need a spanking." Rarity put Rainbow over her knees. She patted her butt lightly. It felt even better soaked with pee. Rarity spanked Rainbow Dash ten times, droplets of pee flying from her tushie with each swat. Rainbow took as much pleasure in this as Rarity, being spanked in wet pants. When Rarity was done, she set Rainbow back in her puddle and drank several cans of soda.

Soon, Rarity needed to pee really badly. "Rainbow Dash, I have to use the bathroom."

"Too bad. You're staying right here."

"But I really really really REALLY have to go!" Rarity crossed her legs and fidgeted.

"Then go in your unitard," said Rainbow.

Rarity squirmed, accidentally farting a few times, until she was sure she wouldn't be able to hold it much longer. She stood up and said "Lay down."

Rainbow lay on her back, and Rarity walked over to her, leaking slightly, and squatted over her. As with when their positions were reversed, Rarity positioned herself so her butt was facing Rainbow's head. Rarity let go and peed through her unitard all over Rainbow Dash. Rainbow took pleasure in the golden shower, as well as the sight of Rarity peeing herself. Rarity sighed in relief as she continued to empty her bladder in her outfit, and Rainbow peed a little more.

Once Rarity was done peeing, she sat back down in her wet unitard. Rainbow Dash sat up, drenched in pee. They made some casual conversation for a bit, and then Rarity fed Rainbow Dash a prune.

Rainbow let out a series of dirty wet farts, and Rarity positioned her with her rear end in the air. Soon, Rainbow released explosive diarrhea into her wet pants.

"Oh man... I messed myself real bad," said Rainbow. But she enjoyed it greatly.

"You certainly did," said Rarity. She set Rainbow back into sitting position, and as Rainbow wiggled her butt in her mess, Rarity ate a prune. Soon she was feeling its effects. She laid Rainbow on her back again, squatted down in front of her face, and let out a few wet farts before releasing a large amount of hyperscat into her unitard. She sighed in relief as she finished messing herself.

Rainbow sniffed Rarity's filled bottom. "Phew! That really smells, Rarity."

Rarity giggled. She let out a sloppy wet fart and soiled her unitard further. PLORP!

Rainbow also let out a sloppy wet fart, releasing a little more diarrhea. BLART!

Then Rarity sat on Rainbow's face. Rainbow took immense pleasure in her face being pressed against Rarity's messy unitard, and Rarity liked the feeling of her mess squishing under her.

Eventually they decided they had their fun, so Rarity untied Rainbow and, as usual, when it got dark, they washed each other in their wet, soiled outfits, and changed into their pajamas.

As they lay in bed, Rarity asked "How about you and I go camping for a week tomorrow?"

"Sounds good."

"Ooh! I could make us some outfits for the occasion. And they'll be really fun to go to the bathroom in."

"Sounds good."