Author's Notes:

With the way I ended the last chapter I couldn't resist doing this one.

The girls were going for a walk in the park. They were all wearing their usual outfits, except Sunset Shimmer, who was wearing her jeans.

Rarity had her gem around her neck, in case she got dirty or wet her panties, and so did Rainbow and Pinkie. But they kept theirs tucked under their shirts so Rarity wouldn't suspect.

"Hey Rarity," said Rainbow Dash, "I brought more cider than I could drink. Would you mind finishing this one for me?"

"Why thank you Rainbow Dash," said Rarity, and she drank the cider.

Rainbow immediately worked her gem's magic on Rarity.

"Ah, that was refreshing," said Rarity.

She suddenly felt a pressure in her bowels. It couldn't be coincidence. Had Rainbow put fart powder in her cider? Or did she use the magic she had given her?

Well, two could play at that game. Rarity touched her own gem.

Rainbow Dash felt like she was about to explode. She immediately let loose with a series of loud farts. Pinkie Pie laughed really loud, and Fluttershy, Sunset, and Twilight giggled a bit.

"Ugh, how revolting!" Rarity said, while releasing a long, silent fart of her own.

"I can't help it," said Rainbow Dash as she continued to fart loudly. "I don't know what it is, but I'm REALLY gassy today!"

BBBBRRRRAAAAAAAP! PPPFFFFFFT! BBBRRRRRT! FFFFFFFFRRRRRRRRRRRT!

Pinkie fell on her back kicking her legs in the air laughing, not caring who saw her panties under her skirt, while Rarity continued to fart silently. She could always keep it silent when she wanted to, but with how gassy she was, she knew they'd be able to smell it, so she needed someone else to fart as much as her. She knew Rainbow could fart without shame, besides, she had been the one to prank her, so it was only fair that she be the distraction.

"Fine, but don't go near me until it's over. I can't stand to be near anyone who's breaking this much wind!"

She walked away from the rest of the girls, winking at Fluttershy, who was pretty sure she understood what was going on.

Rarity stood a few meters away. While Rainbow Dash farted loudly, Rarity farted silently.

Soon, their gas was gone. Deciding it was safe to do so, Rarity rejoined the others.

"Are you... quite finished?" said Rarity.

"I think so," said Rainbow Dash. "You have to admit, that was pretty funny!"

"I think it's uncouth and disgusting, but let's put that behind us and enjoy the rest of the day."

They found a vending machine. Pinkie got two sodas from it and drank one.

"Want a coke?" said Pinkie, holding it out to Rarity.

"No thank you," said Rarity, sure that Pinkie was going to try to prank her.

"All right." Pinkie drank the coke in one gulp.

Once they returned home, Rainbow walked with Pinkie.

"Pinkie, why did you make me fart so much?" said Rainbow once they were out of earshot of the others.

"I didn't!" said Pinkie. "I wanted to hear Rarity fart. You did work your magic on her, didn't you?"

"I did. But, you honestly didn't use it on me?"

"Cross my heart and hope to fly stick a cupcake in my eye!"

"Huh. I assumed that we couldn't hear her farting over me. Or that she was farting silently but we couldn't tell even by smell because of my farts. I guess maybe some of her barrier magic made it backfire on me."

"I didn't see any barrier. Maybe she has one of those gems too."

"That's crazy! Why would she want one?"

"They don't just make you fart, pee, or poop. They can also clean you up. And she WAS wearing a very similar gem around her neck, and has been for a while. Maybe she keeps it handy in case she gets dirty, and whoever gave us ours gave one to her for that reason. But she also knows what else it can do, and made you fart so that no one could smell her farts."

"You're saying Rarity made me fart? If she did, she's a really good actress. She was really offended by it."

"Well she always reacted that way whenever we farted in front of her, so she's had practice. And I think she'd much rather have you shamelessly fart in front of her than humiliate herself by farting in front of us!"

"You might be right. Either way, it's unlikely we'll ever get to hear her fart. If it backfires, that's that, and if it doesn't, she'll just make us fart as a distraction. Plus, if you're right, then she was farting silently, so she probably doesn't even know HOW to fart loud any more than Fluttershy does."

"Oh well! We can still fart in front of each other!" She raised her hand to her gem...

...

While Pinkie and Rainbow were farting repeatedly at Pinkie's house, Rarity and Fluttershy were having another session with the horses at the mud field. For the first time Rarity wore her dress to it twice in a row.

"Do you think Rainbow Dash suspects?" said Fluttershy as they sat beside each other, peeing non-stop in their heavily-soiled dresses.

"If she does, she probably thinks I kept this gem only to clean up whenever I get dirty," said Rarity. "And that I'd only use its fart power in situations like that."

"I didn't hear you fart there."

"I can fart silently. It's part of my ladylike act." She let out a boisterous wet fart. "When I want to, of course."

"So can I. Some of the times Rainbow Dash or Pinkie Pie farted, I also farted, so anyone else would think it was all them. But the only times my farts haven't been silent are when I'm alone, and when I'm with you." There was a certain irony that Rarity was the only one she could fart in front of. "I guess it comes from being really shy."

"And really graceful."

Fluttershy noisily released a mess into her panties.

"When you want to be, of course."

Fluttershy giggled.