Author's Notes:

This is a more M-rated version of Chapter 3 of Playing in the Mud. Remember the CMC are aged up!

After Rarity and Sweetie Belle had begun engaging in their messy activities with each other, Rarity had gotten a powerless crystal from the cave, empowered it using her crystal, and give it to Sweetie Belle so she could have as much fun as she wanted. Sweetie Belle wore it around her neck like a necklace most of the time. Often she would have a little fun with it; when she needed to go to the bathroom really badly, she would make it to the bathroom, go in her panties, and then magically clean herself up, then flush the toilet to avert suspicion. Apple Bloom and Scootaloo had no idea. She had told Rarity, of course, who said she usually did the same thing.

One day, the Cutie Mark Crusaders were walking through the park. It had just rained earlier in the morning, so there were puddles and mud puddles everywhere.

Sweetie Belle was wearing a light blue tank top and a pink skirt halfway to her knees. Apple Bloom was wearing a green T-shirt and short jean shorts. Scootaloo was wearing a dark purple midriff tank top and matching short, skintight shorts. Her hair was now in the same style as Rainbow Dash. All three were truly a sight to behold, each in their own way.

Sweetie Belle splashed around in the puddles. Even at 18 she loved this.

Until she accidentally lost her balance and fell on her butt, which splashed into the puddle she was standing in. Her legs were spread wide and Apple Bloom and Scootaloo could see her purple panties. They blushed lightly, but Sweetie Belle didn't seem to mind too much.

After Sweetie Belle got back to her feet, Apple Bloom farted loudly. She looked over at Scootaloo, silently challenging her to fart louder. Scootaloo lifted her leg and let out a louder, longer fart. It seemed their lunch together had made them gassy.

Sweetie Belle giggled. Apple Bloom and Scootaloo had farting contests all the time, which Sweetie Belle didn't mind but she'd never partake in them herself, as she tried to act more ladylike and usually wouldn't fart in front of anyone. But, she felt more confident after her dirty sessions with Rarity, so she let out a wet fart that wasn't very loud. Scootaloo and Apple Bloom didn't notice, as they were too busy trying to outfart each other.

"I gotta go to the bathroom," said Apple Bloom after the latest fart.

Scootaloo immediately started tickling Apple Bloom. Apple Bloom laughed hard as she was forced into a sitting position.

"SCOOTALOO STOP! HAHAHAHAHAHAHAHA! I'M GONNA PEE! HAHAHAHAHAHA!"

In a matter of seconds, Apple Bloom's jean shorts darkened, and a puddle grew under her.

"Scootaloo!" said Apple Bloom. "I told you, not in front of Sweetie Belle!"

"I'm sure she doesn't mind," said Scootaloo. "She doesn't get offended at our farting contests." She farted again to make the point.

Not in front of Sweetie Belle? Sweetie Belle tilted her head. Did this mean Apple Bloom and Scootaloo liked making each other wet themselves when they were alone together? It must, for Apple Bloom was barely even blushing, and looked as though she didn't mind peeing herself. To test this, she raised her crystal and mentally told it to make Scootaloo have to pee badly.

"Oh, I gotta go... BAD!" said Scootaloo, putting both hands on her crotch. "I'll be right back!"

"Oh no you don't!" Apple Bloom grabbed Scootaloo's feet, causing her to fall facedown. Apple Bloom sat on Scootaloo's butt, took off her shoes, and tickled her feet. Scootaloo laughed so hard, and within seconds a puddle was appearing under her, growing by the second. Apple Bloom stopped and sat up, slapping Scootaloo's butt lightly.

Scootaloo sat up, still peeing, and farting at one point in the middle of it.

"Wow, you really needed to go," said Apple Bloom as Scootaloo kept peeing for two and a half minutes. Scootaloo only sighed in relief.

Then Apple Bloom let out another wet fart, and slapped her soaking wet butt.

Sweetie Belle quickly cast a spell, then lifted her leg and farted loudly for about 10 seconds. Apple Bloom and Scootaloo turned to look at Sweetie Belle, who blushed lightly.

"I think it's kinda fun to fart, and I was wondering if I could enter the next farting contest." She felt the urge to pee hit. "But first... I have to go to the bathroom REALLY badly!"

"Then go," said Apple Bloom.

Sweetie Belle realized they weren't going to force her to wet herself. They didn't know she enjoyed it, and she suddenly wanted to know what it was like to wet herself from being tickled too hard. "Um... my panties are already wet, so you can tickle me if you want."

Apple Bloom and Scootaloo wasted no time. They started tickling Sweetie Belle's sides, and she started to laugh hard. She fell on her back, still laughing but only dribbling a bit, and involuntarily farting a few times. Apple Bloom held Sweetie Belle's legs up while Scootaloo took her shoes off and tickled her feet with a feather she had found on the ground. They could see her purple panties growing wetter by the second.

Sweetie Belle did not stop laughing as she peed herself all the way, soaking her underwear and much of her skirt. She peed for 2 minutes and 40 seconds after Apple Bloom and Scootaloo were done.

"Well," said Scootaloo once Sweetie Belle was done peeing, "time for our farting contest!"

Apple Bloom farted loudly for 13 seconds, looking very proud of herself.

Scootaloo stuck out her butt in Apple Bloom's direction and farted even louder for 17 seconds.

BBBBBBBBBBBBRRRRRRRRRRRRRRRRAAAAAAAAAAAAAAAP!

The force of the fart made Apple Bloom fall butt-first into a big puddle of mud nearby.

Sweetie Belle farted in Scootaloo's face for 14 seconds, sending her falling into the mud as well, and then she jumped into the mud, landing in a sitting position. "Mud fight!"

They splashed around in the mud for a while, farting in each others' faces and slapping each others' butts. Every time her hands were free Sweetie Belle would make them have to pee, and they wasted no time in peeing themselves while sitting on each other. Then Sweetie Belle turned it up a notch.

PPPPPPPPPBBBBBBBLLLLLLLLTTTTTTTH!

"Ah think ah just soiled mahself," said Apple Bloom as she felt the mess in her shorts squish beneath her rear as she sat down.

PPPPPPPPPLLLLLLLLSSSSSSSSSSH!

"I think I did too," said Scootaloo. Both she and Apple Bloom seemed to enjoy it, and Sweetie Belle unabashedly and noisily released the contents of her own bowels into her underwear.

Scootaloo sat on Sweetie Belle's butt, feeling the messes they had made squish against each other. She had just started peeing when Apple Bloom farted in Scootaloo's face.

They had fun playing VERY dirty for a while, until they eventually got tired and stopped.

"We've got a lotta cleanin' up to do," said Apple Bloom.

"I wonder why we had to fart and pee so much," said Scootaloo. "I wish we could do it again!"

"We can," said Sweetie Belle, "because I have a crystal containing Equestrian magic that can make us pee, poop, or fart as much as we want!"

"REALLY?!" said Apple Bloom and Scootaloo. Apple Bloom was so excited she peed again.

"It'll also clean us up." Sweetie Belle held it up, and in an instant, all three girls were dry and completely clean.

"That's so awesome!" said Scootaloo.

"I can't wait till next time!" said Apple Bloom. "Where'd you get it?"

"A cave full of magic crystals," said Sweetie Belle, for she knew Rarity wouldn't appreciate if she told anyone else about her dirty little secret.

They walked home, farting and giggling the entire way, and Sweetie Belle had to use the crystal again when Apple Bloom messed herself.