Author's Notes:

An earlier request from long ago that I never got around to answering.

This might go less extreme than a few of my most fetish-fuel stories because she really enjoys it, but it will disgust anyone who dislikes this stuff probably more than any of my other stories.

It was a mild summer day, and Rarity was walking to one of her new favorite spots. She had discovered this place accidentally while going for a walk, and wet herself with excitement when she had found it. Having had her magic gem with her she had dried her purple skirt, but left her underwear wet.

This spot she had discovered was a large field made entirely of mud, and there were horses there. Horses that seemed to like walking around in the mud. They appeared to be living here naturally, for there was no barn nearby, but there was plenty of food for the horses at the side of the mud field.

And Rarity was feeling a little more daring. It was fun to have her sessions in her backyard, but there was some sort of a thrill do doing it more out in the open. And she wouldn't have to worry about being seen on the way back, because she always brought her magic gem which not only enabled her to fill her bladder and bowels as much as she wanted, but could also clean her completely. She'd usually stay in her messy state for as long as she could, but on the rare occasion she saw anyone, she'd use her gem to clean herself before they could see or smell her. In which case, as soon as she was out of sight she'd mess herself, cleaning up only if she was seen again.

She loved the things she could do without anyone knowing now that she had this gem. She rarely even used a toilet anymore, unless she knew she'd be unable to wet or soil herself without anyone knowing in the moment, or else knew she didn't have her gem handy.

Today, Rarity was wearing her light blue tank top and skintight purple shorts, with pink panties underneath. She would alternate between the shorts and her usual skirt.

She walked into the mud field. She used the crystal's magic, then released a series of wet farts, ending with her making a noisy mess in her shorts. The hyperscat oozed through her shorts and down her legs. She giggled at the sensation.

Rarity sat down and rolled around in the mud. After about five minutes, she sat up, used the crystal's magic again, and let out another loud fart, filling her shorts with more hyperscat.

Then she crawled on all fours over to a horse that was standing still. She positioned herself next to the horse's butt.

The horse sat on her, forcing her facedown into the mud. Rarity liked this. She had discovered this accidentally trying to get the horse to do something else. She didn't know why but whenever she got near a horse's rear end, unless she was standing up, it would sit on her.

Rarity was able to touch her gem, but using its magic on the horse instead of herself.

The horse farted loudly. Rarity giggled. She liked the sensation, and she liked the rancid smell that came with it. It smelled worse than any of her own farts. She usually smelled like farts when this was done, in addition to pee and poop. Of course, the gem's cleanup made the fart smell go away as well so she could get as stinky as she wanted!

She touched her gem again, and let out a boisterous fart of her own.

Rarity farted a few more times before the horse farted on her again. Rarity used her gem again, and let out a 45-second fart that turned very wet at the end, and it made her underwear feel even dirtier. She giggled again.

Then Rarity let out a sloppy wet fart that she knew had soiled her shorts further. Not that they could really get any dirtier in their current state. Well, maybe they could. She touched her gem again and peed herself, sighing of relief as she had overflowed her bladder with the gem's magic.

She peed for four minutes; The horse farted on her twice more before she was done. She sighed in satisfaction, very aroused by the state she was in now.

Then the horse stood up, and a few seconds later, Rarity felt a wet pile of manure fall on her.

The first time she had gotten dirty at this field, she knew the horses probably did their business in the mud and therefore she'd be getting messy with their poop in addition to her own. Then, when she saw one of the horses lift its tail, she wasted no time in getting behind it. It was just as fun and arousing for her as soiling herself, but in a different way.

The horses would usually do this to her after farting on her, or else without even sitting on her. It was almost as though they could sense how much she liked it. If they didn't poop, Rarity would make them with her gem, and sometimes enhance how much the horses needed to go.

Then another horse walked by, lifted its leg, and sprayed her with a powerful stream of pee. Rarity sighed, loving the warmth and the naughtiness of allowing herself to be peed on by a horse. She quickly touched her gem and released a stream of her own into her heavily-soiled shorts, while filling the horse's bladder as well. Occasionally refilling when she was sure both their bladders were almost empty. It was like taking a shower, but much more arousing.

After fifteen minutes straight, both Rarity and the horse finished peeing, Rarity having decided she was done her golden shower. She was drenched in pee from head to foot, most of the mud and manure having washed off her. Only one thing to do about that!

Rarity saw two more horses standing back to back (or rather butt to butt) and worked her gem's magic on them, then got between them as soon as possible, sliding on her back through the mud.

With a whinny of surprise, the horses lifted their tails and buried Rarity under a mountain of manure.

Rarity raised her gem to her mouth, repelling the dung around it so she could breathe. Then she used its magic and released a smelly mess of her own into her shorts.

She lay there for longer than she could count, peeing at one point.

When she was finally satisfied, she climbed out of the pile of horse poop - and could not believe what she saw.

Fluttershy was laying facedown in the mud. She looked as though she was wearing her usual green skirt, but it was hard to tell because she was covered in mud and a horse was sitting on her butt and farting on her. Fluttershy giggled, then let out the same sort of sigh as Rarity had when she was peeing herself.

Rarity was so shocked she accidentally let out a loud fart. Which may have been more of a shart.

Fluttershy looked up. "Rarity?"

"Fluttershy!" Rarity felt herself blush beet red.

"This isn't what it looks like!" they both said at once.

"Well... maybe it is," said Fluttershy. "I hope you're not really disgusted with me..."

"Darling, why would I be?" said Rarity. "I'm doing the same thing. It looks like we both have the same dirty secret."

Then the horse stood up and released a shower of manure all over Fluttershy.

"I wish you didn't have to see that..."

"I get them to do that to me all the time. That wasn't mud I just climbed out of."

"How do you do that?"

"I may have found a gem that allows me to make anyone have to go to the bathroom in either way or fart as long as I want." She didn't have to ask how Fluttershy did it. She used her geode to talk to the horses. Now she understood why they always sat on her when she got behind them. It was because Fluttershy had asked them to do this to her, as though it were a signal.

"Um... if you don't mind... are there any more of them?"

"I could make another one for you."

"Please don't tell anyone about this."

"What would I say? 'Guess what girls? Fluttershy likes to have horses sit on her, fart on her, and do their business on her. How did I find out? Because I like to do the same thing.' I can assure you I'd be just as embarrassed as you if anyone else ever found out. Besides, I'd never do that to you."

Fluttershy gave Rarity a hug.

"I had no idea you liked getting this dirty so much," said Fluttershy. "You don't... pee yourself too, do you?"

"I do."

"And do you... um... mess yourself when you get the chance?"

"I use this gem's magic to make it happen quite often."

"Can you... if that's all right... use it on me?"

"Why, of course, darling. Which..." She refrained from saying "rather unladylike activity", for she thought Fluttershy might take it the wrong way. "...would you like to do?"

"All of them."

Rarity couldn't tell because of the mud and manure on her face, but she was sure Fluttershy was blushing.

"I'll do it with you!" said Rarity.

"Oh Rarity, you don't have to."

"No, but I want to. I told you I really enjoy it."

Rarity and Fluttershy sat beside each other in the mud, and then Rarity used the gem's magic on herself and Fluttershy. She never in a million years thought she'd be using it on her. Even less so than Sweetie Belle.

For the next half hour, Rarity and Fluttershy were farting, peeing themselves, and soiling themselves, enjoying every second of it and feeling no shame about doing it in front of each other.

Rarity whispered something to Fluttershy, who called two horses over and asked them to pee on her and Rarity when they needed to. Rarity worked her magic on the horses, who immediately showered the two wet, dirty, smelly girls with pee.

As she had done last time, Rarity set her gem to overflow her bladder, as well as Fluttershy's. Both girls sighed as they let it flow. After the muck had been washed off them by the golden showers, Rarity could see Fluttershy was indeed wearing her green skirt and white tank top.

"Wow, how long is this going for?" said Fluttershy, for she, Rarity, and the horses were still peeing after twenty minutes. She didn't comment before then because she was enjoying it too much.

"I lost count," said Rarity. "I'm refilling us when I feel we're about to get empty."

"How are you doing?" Fluttershy said to the horse peeing on her.

The horse whinnied.

"The horses are having fun too."

"Between your ability to communicate with them and my ability to make them and us need to go, or fart, I think we're both going to have a lot more fun with this than we used to."

Fluttershy giggled. "I never knew it would be so fun doing it with someone else. Or that anyone else would want to."

"Of course, we'll keep this between ourselves and the horses," said Rarity.

"Right," said Fluttershy. "I'd die of embarrassment if anyone besides you found out."

"You and me both. How do you keep your geode so clean?"

"It seems to repel any kind of dirt."

"That reminds me, my gem can also clean us completely."

"That's nice. Now I won't have to worry about being seen on the way home. But I rarely ever see anyone on the path, and if I do, I keep a distance so they can't smell me. They'll just think I like to play in the mud as much as Rainbow Dash and Pinkie Pie. And, once I have my own, if I really need to go, I can just pee in my panties and no one will notice! Um... if that's not too weird."

"After everything we just did, and what we're doing now, do you honestly think I can be grossed out by anything you do? Besides, I've been doing the same thing for years. But when it's not just us, I'll still act disgusted by any of it."

"Right. And next time we come here I'll wear my gym shorts." They looked just like Rarity's but green.

"I like to alternate between my gym shorts and my dress."

"So do I. They're both really fun to pee in."

Rarity let out a sloppy wet fart. Fluttershy giggled, and let out a wetter fart.

"Are you ready to stop peeing yet?" said Rarity.

"Not yet," said Fluttershy.

"Me neither!"