Author's Notes:

I did this chapter by request. As is usual for anything I write nowadays.

Quality might be lower.

It had been a few weeks since the day in which Rarity farted several times and was in desperate need of a bathroom. Sunset Shimmer had forgotten that event, but she did notice that ever since then, Rarity was always in a hurry to get home after school without stopping to talk to her friends or anything.

One day, she decided to investigate and see what the deal was.

As Rarity rushed home, Sunset secretly followed her. Today Rarity was wearing a skintight pair of purple shorts, and Sunset was wearing jeans.

Sunset eventually reached Rarity's house and waited behind the fence of her backyard, though she wasn't sure that what was going on wouldn't be inside.

Then, Rarity walked out the back door, and Sunset tried to stay out of sight, but kept an eye on Rarity.

Rarity lifted her leg and let out a loud fart, sighing of relief. Sunset had never seen Rarity take pleasure in something so unladylike before. Not that she didn't secretly love to fart...

Rarity farted again, and a small brown spot appeared on the back of her shorts. Then...

PPPPPPPPPPBBBBBBBLLLLLLLRRRRRRT!

Sunset stared as a brown bulge appeared on the back of Rarity's shorts, and she sighed in relief, and then giggled.

As Rarity sat down and let her mess squish under her, Sunset felt extremely aroused. She couldn't believe what she was seeing. Rarity, the most ladylike girl in the school, was satisfying her deepest fetishes, and enjoying it.

Then, Rarity noticed Sunset, and blushed beet red.

"Sunset Shimmer! It... This isn't what it looks like! I..."

A wet fart made its way out of her as she soiled herself further.

"It's all right, Rarity," said Sunset. "I don't find it revolting. As a matter of fact, I share the same fetish."

"You do?" said Rarity.

Sunset tried to soil herself, but all she was able to do was fart twice and pee in her jeans. She blushed lightly but giggled to show she was enjoying it.

"Why don't I treat you to something that will make you have to... go... faster?" said Rarity.

"I'd love to," said Susnet.

Without changing out of her soiled shorts, Rarity took out one of the potato salads she had stocked which would often make her have to poop very badly. And she cooked some beans, and gave Sunset some prunes and a glass of prune juice to go with it. While keeping some of each for herself.

Once they were done, they waited in the backyard.

Soon, the beans started to take effect, and Sunset let out a loud, wet fart. She blushed lightly, thinking Rarity was going to be offended, but remembered they were playing out their shared fetishes.

Rarity let out a wetter, smellier fart. Or maybe it seemed smellier because Rarity smelled really bad in her current state.

Sunset lifted her leg.

FFFFFFFFFFFRRRRRRRRRRRRRRT!

Rarity let out a shorter but wetter fart.

After about half an hour of farting, they felt the urge to poop.

Or, at least Sunset did. Rarity farted louder...

"I think I soiled myself again." Rarity blushed lightly and giggled.

Sunset released the contents of her bowels into her jeans and panties. It was very wet and came out fast and noisily. She took great pleasure in the feeling of it. Now her jeans were not only wet, but dirty, smelly, and stained brown at the back.

Rarity pushed harder and released an equally wet, equally smelly mess into her shorts, while Sunset sat down, feeling the poop squish beneath her rear.

Then Rarity peed, having not used the bathroom since lunch. Sunset had already wet her pants but she was still able to pee a little more.

"Let's have a few more experiments with this," said Sunset. "Would you like to rub my butt?"

Rarity might have been disgusted by this, but her scat fetish was too powerful now. "I'd love to."

She began rubbing, feeling the mess squish between her hands and Sunset's tush. Then, Sunset farted again, and both she and Rarity giggled.

Afterwards, they switched places. Rarity had a much bigger mess in her shorts than Sunset, and they both took great pleasure in every second.

"How about we drink a lot and give each other golden showers?" said Rarity.

"That sounds like a plan!" said Sunset.

So, they drank several glasses of water each. While they waited, they took turns sitting on each other while the other was laying down, getting more dirty in the process, and farting a few times. Both girls smelled really bad at this point, but they were enjoying this a lot.

Finally, they felt they needed to pee.

"You can go first," said Sunset. She laid down on the ground while Rarity stood above her, spread her legs, and began peeing in her shorts, again.

"Ahhhhhh," Rarity sighed as the pee soaked through her shorts and fell on Sunset, soaking her completely. The pee was a bit dirtier due to the mess in her shorts, but Sunset didn't mind.

Once Rarity finished peeing, they swapped places. Sunset spread her legs, but in her current state she was dripping on Rarity already. Sunset peed through her already-wet pants all over Rarity, and both sighed in satisfaction.

PPPPPPBBBBRRRRRT!

Sunset soiled herself again in the middle of wetting herself.

Once she was finished peeing, Rarity stood up and slapped Sunset's butt lightly. Then Rarity farted loudly, soiling herself even more, and they pressed their butts against each other and rubbed them, feeling the mess in their underwear squish against each other.

They had a lot of fun for another hour, before they eventually stopped. They showered, changed, put their wet, dirty, smelly outfits in the washing machine, and laid down on the couch. They would experiment with scat and watersports more in the future, they knew it, but they would never forget this day.