Author's Notes:

Yes, I know the last chapter was called Finale, but I couldn't resist adding Sunset into a story like this that plays my fetishes to the highest level. And I also couldn't resist giving her a little more buttplay.

Also, remember even though a few years have gone by since the first chapter they look exactly the same as when they were 18.

Five days after Rarity and Fluttershy introduced Rainbow Dash and Pinkie Pie to their secret mud field, all seven of the girls were hanging out. All were wearing their regular outfits.

At one point, Rarity tripped and fell in a mud puddle. She used her magic gem to clean up and laughed it off with the other girls.

Sunset Shimmer was wearing her geode. Rarity, Fluttershy, and Rainbow Dash were easily able to avoid thinking about their dirty activities around her, especially when they were having this much fun.

Pinkie Pie, however, was not. Or maybe she didn't try hard enough because she felt no shame in it.

When they were about to go home, Pinkie gave Sunset a hug, Sunset could tell what she was thinking.

This is really really fun, but I can't wait to have more fun playing in the mud, farting, peeing myself, and pooping myself, and having horses sit on me, fart on me, and pee on me! I love days when I can do that AND hang out with all my friends in the same day!

Sunset couldn't believe what she had heard. She acted like she hadn't heard anything, and made her way home.

She was not disgusted, but curious. She knew Pinkie loved to fart - she secretly didn't mind it so much herself - but she had no idea she loved wetting or soiling herself. Well, it shouldn't have been surprising. Pinkie was weird in many ways. Yet... Sunset was quite intrigued by this.

...

Sunset returned home with two cans of beans, along with soda, prune juice, and food that would make her poop. She changed into her purple pajamas, cooked her food, and ate it as fast as she could, downing the soda and prune juice at the end.

She waited until everything she had eaten took effect.

At first, she was just gassy. She lifted her leg and farted loudly. Then she let out a loud fart for five seconds. She giggled and slapped her butt, which always looked sexier in her pajama pants.

Then she got down on all fours like a pony and farted loud for six seconds. The room was starting to smell now, but she didn't mind.

Then she raised her rear end in the air.

BBBBBBBBRRRRRRRRAAAAAAAAAAP!

Sunset giggled at the deep-pitched, eight-second fart that had come out of her. She knew Rainbow Dash and Pinkie Pie found it funny, but she wouldn't dare fart in front of them. Or would she? Definitely not Rarity. She always got offended when Rainbow and Pinkie farted in front of her.

After half an hour of farting, Sunset needed to pee. She started to run to the bathroom, but stopped, remembering what she wanted to do.

She hesitated. She was about to wet her pants, to do something Rarity would find absolutely revolting. But it was something that Pinkie Pie thought was fun, so it couldn't be that bad.

She paused to fart again, and then closed her eyes and started peeing. She felt the warm wetness soak her crotch and flow down her legs, and she couldn't deny that she liked it. She could only imagine how this must feel after holding it for a long time. She'd be sure to try this next time. She let out a moan of pleasure as she finished soaking her pajama pants, farting loudly at the same time.

The pee was only half of her experiment. But, the other half couldn't be far behind. Sunset slapped her behind for how naughty she was and continued to fart loudly.

As the minutes went by, her farts became wetter and smellier, and she'd always slap her tush after a particularly loud or long fart.

Finally, while she was on all fours in her puddle of pee, she let out a boisterous wet fart, and was a little surprised as she filled her pajama pants with a wet, brown, smelly mess. Though this was what she had intended, her eyes went wide and she froze in place.

She stood up and waddled around the room, feeling her mess in her panties and pajama pants. It felt strange, but she liked it. A lot. It was so arousing to her to do something so naughty.

Sunset farted three more times before she felt the second wave. Without a moment's hesitation, Sunset emptied her bowels into her pajamas again, sighing of relief, and then giggling at what she had done. She smelled really bad now, but this only made her like it more. She didn't know she could be so... dirty, and she could see why Pinkie liked it.

Suddenly, the third wave hit, and Sunset pushed it out. The poop was oozing down the legs of her pajama pants and onto the floor. She had overflowed her pink panties.

As she watched her mess ooze onto the floor, it suddenly hit her that she was going to have to clean all this up. She had taken so much pleasure in wetting and messing herself that she hadn't thought about what would happen after.

Well, she knew she'd be able to clean up, but it would be a very messy job. She mopped up her puddle and all the poop on the floor, in the process soiling herself again, giving her more of a mess to clean up.

Once the floor was relatively clean, she walked into the bathroom. She'd have to mop the floor once she'd washed and changed.

She farted loudly, feeling the final wave coming. She couldn't resist sitting on the toilet, her soiled pants still up, and pooping herself one more time. Then she dumped the massive brown mess out of her pants and underwear into the toilet. She had to pause to flush a few times to avoid clogging the toilet.

Then she walked into the shower, still in her pajamas, and turned it on, washing as thoroughly as she could. She spent extra time rubbing her butt with soap, either because her butt was definitely the dirtiest part of her or because she really liked her butt being rubbed.

After a few minutes, the water on the floor of the shower turned from brown to clear. Sunset stripped out of her wet pajamas and continued to wash herself.

Once Sunset was sure she was perfectly clean and smelled of nothing but soap, she stepped out of the shower, changing into a white tank top and a gray pair of shorts.

She threw her pajamas and her soiled panties into the washing machine, and then mopped the floor.

She sighed as her work was mostly done. She sat on the couch thinking of how much she had enjoyed tonight, and how much fun she would have in the future. If cleaning up didn't take so long. She let out a few farts, but she didn't have to poop anymore.

After her pajamas finished in the dryer, Sunset took them out. She didn't use as strong a detergent as Rarity did, so her panties still had a brown stain, as did her pajama pants. Sunset initially got some naughty pleasure out of the fact that her pajama pants would be stained at the butt, until she realized the other girls would likely notice.

Well, she could use a stronger detergent. But if only there was a way to magically clean up after soiling herself, to remove any stains...

Then she remembered. Rarity had fallen into the mud earlier today and used a new magic gem to clean herself, making it look as though she had never even touched mud today. If anyone could help her enjoy her newfound fetish, it was Rarity.

...

The next day, Sunset knocked on Rarity's door. She was wearing a tight pair of jeans and a pink and white T-shirt.

Rarity answered the door. She was wearing a light blue tank top and her short, tight purple shorts.

"Good morning, Sunset," said Rarity.

"Good morning," said Sunset. "Rarity... can I ask you something?"

"Why, of course."

"You know that gem you used to clean up after you fell into the mud yesterday?"

"Yes?"

"Do you have any more of them? You know, in case I fall into the mud or something?"

"I can use it to turn an ordinary gem into another one of these. It may have some... other powers, but there's only one I care about."

Sunset gave Rarity a hug, and she immediately sensed her thoughts.

Oh, I do hope Sunset doesn't suspect that I like to use the gem's power to fart, wet myself, and soil myself. If she finds out how much I like that...

Pinkie Pie was one thing, but Rarity? She seemed so proper and ladylike. Was it all just an act? She also noticed that Pinkie was recently wearing a similar necklace to Rarity. And so were Rainbow Dash and Fluttershy. Did they all do this? Did they do it together? Probably not Fluttershy, but she could see Rainbow Dash doing something like this.

"Actually..." Sunset felt a little more at ease saying this now that she knew Rarity liked to do it too. "I have a confession to make."

"What is it, darling?" said Rarity.

"Promise you won't get disgusted at this." She knew Rarity wouldn't, of course.

"I promise." Rarity was sure she knew what was coming, and she was actually a little excited about it.

"I want to use it to clean up after getting a little dirtier than mud."

"Whatever do you mean?"

"Well... Pinkie Pie let slip that she likes to wet herself and soil herself. I got a little curious, and tried it out. And I really enjoyed it, but I didn't like the cleanup much." She blushed lightly.

"Don't feel ashamed, darling," said Rarity. "I'm not disgusted. As a matter of fact, I... well, you probably already sensed this cause I couldn't keep my thoughts clear, but... I also take pleasure in... wait, you're not just pretending, are you?"

"No, I'm being completely honest."

"Prove it." Rarity touched her gem, and Sunset felt an intense urge to pee.

"Your gem can do that too, can't it?"

"Well, you know where the bathroom is. But, if you like it that much, wet your pants. You already know I won't mind, and I'll dry you off."

Sunset hesitated, reluctant to pee in front of Rarity. But she didn't run to the bathroom. After about a minute, during which the pressure became more intense, Sunset let it all out in her jeans, sighing of relief and pleasure. Once she finished wetting herself she blushed a little.

"That is just marvelous," said Rarity. She touched her gem and started to pee in her shorts, farting loudly as well. "Would you like to join me and the others at our secret spot?"

"The other girls do this too?" said Sunset.

"Not all of them, but some of them. Pinkie Pie included. I'll ask them, and they'll probably say yes."

...

That afternoon, Sunset walked with Rarity, Fluttershy, Rainbow Dash, and Pinkie Pie to the mud field. Sunset and Rarity were wearing their same outfits from earlier today, which they had already dried. Fluttershy was wearing a white tank top and short skintight green shorts. Rainbow Dash was wearing her usual black compression shorts under a pink skirt. Pinkie Pie was wearing her short, tight jean shorts. It was a hot summer day, after all.

Sunset was also wearing one of the magic gems around her neck, which Rarity had made for her.

"Do you think Twilight and Applejack would get into this?" said Sunset.

"I don't know," said Rainbow Dash. "Maybe."

"But let's not let them in on it unless we find they have the same interest as us," said Rarity.

"This is gonna be so much more fun with five of us!" said Pinkie Pie.

Sunset was very nervous about doing all this in front of four of her friends, despite what had happened with Rarity this morning. She was so nervous she accidentally farted, and wet her pants.

"Aw, she's so excited she peed!" said Pinkie.

Sunset blushed lightly but giggled.

"Same thing happened to me the first time I came here," Pinkie continued. "And we're only gonna get wetter and dirtier!" She slapped Sunset's butt lightly, causing Sunset to giggle more.

"I can slap harder!" Rainbow Dash swatted Sunset's rear harder.

"I like this game," said Sunset. "Rarity, Fluttershy?"

Rarity slapped Sunset's tush a little less hard than Rainbow Dash. Fluttershy spanked Sunset very gently, but Sunset didn't enjoy it any less.

"Can we get to the REAL fun now?" said Rainbow, though she sneaked another swat in, causing Pinkie to spank Sunset three more times.

"We'll remember this game for later," said Sunset, "but Rainbow Dash is right. Let's get dirty now." She touched her gem, as did Rarity, Fluttershy, Pinkie Pie, and Rainbow Dash.

Over an hour later, they were sitting in the mud, covered from head to foot in muck and smelling really bad, in part due to horses farting non-stop while sitting on them. Their shorts - in Sunset's case, jeans - were filled with poop and saturated with pee, and every few seconds one of them would fart loudly and soil herself further.

"This has been really fun," said Sunset, enjoying the squishy feeling under her butt. "It's so hard to believe we can just clean ourselves up with this once we're done."

"Trust me, it works," said Rarity. "This isn't the first time the outfit I'm wearing now has been this dirty."

Sunset sniffed herself. "And it'll get rid of the smell, too?"

"Most certainly."

"I can't wait to experiment around with this!" Sunset paused to let out a sloppy wet fart, giggling as her underwear got dirtier and stinkier. "With my pajamas, my gray shorts, my jean shorts, my exercise shorts, my skintight jumpsuit..."

"Really, you'll soil the jumpsuit I designed for you?" said Rarity.

"Well... I..."

"I'm just messing with you. I've soiled several of my best outfits for fun, and they're spotlessly clean now!" Rarity noisily released a big mess into her shorts.

"And if I have to go to the bathroom, and I can get about a minute of privacy, or if it's dark..."

"We've all done that quite often."

"And if I don't want to get out of bed right away, I can just pee my pajamas, and dry myself and the bed off so it won't even leave a stain!"

"It is rather convenient," said Fluttershy, farting loudly and peeing a little.

"Want us all to give you a golden shower?" said Rainbow Dash.

"That would be nice," said Sunset.

Rarity, Fluttershy, Rainbow Dash, and Pinkie Pie stood up, stood over Sunset, touched their gems, and peed through their shorts all over Sunset. Sunset loved every second of it. About half a minute in she started to pee as well. Three minutes in she let out a boisterous nine-second fart that turned very wet at the end.

She wouldn't let them stop until ten minutes had gone by. Nor did they really want to.

"Ahhh, that was wonderful," said Sunset, drenched in pee with most of the mud washed off her, and still peeing her jeans.

Then she farted loudly, releasing more foul-smelling hyperscat into her already-soiled pants. All five of them laughed.