Author's Notes:

Remember, while I give Sunset a different outfit in this chapter, the other girls' outfits are their usual ones in this story, unless I say otherwise

Also, usually I'd have Sunset farting in jeans, pajamas, or shorts, but I put her in a skirt this time for someone who loves their skirts being blown back by their farts. But, to make it not seem less fun for me than her jeans, I gave her those shorts under her skirt (drawing a bit of inspiration from a cute picture I saw but making the rest of her outfit different), so it's like she's farting in shorts too.

And this chapter contains a bath scene.

Sunset Shimmer finished her breakfast. Today she was wearing a black T-shirt with a sun on it and an orange miniskirt.

Only minutes later, she could feel it. This was one of those times where she was really gassy.

She lifted her leg, but paused. Maybe today would be a good day for a farting contest with Rainbow Dash.

She called Rainbow Dash's cell phone.

"Hello?" came Rainbow Dash's voice.

"Hi Rainbow Dash. Would you be up for a farting contest today?"

"Whenever you're ready! My soccer game isn't until 3:00."

"Then, come over as soon as you're ready. I might not be able to hold it all in before you get here."

"On it!" Rainbow hung up, sprinkled quite a bit of fart powder into some bottles of cider, and drank them. Then, she ran to Sunset's house as fast as she could. She was so excited to have a farting contest today after competing against Lightning Dust for the first time yesterday, even though she lost that one.

"So, who's gonna be the judges today?" said Sunset.

"The same ones as yesterday, if they're up for it."

While Sunset called Adagio, Rainbow Dash called Applejack.

"Hey Applejack! Feel like timing us on another farting contest today?"

"Aw, shucks. I'd love to, but... Ah got a lotta work to do around the farm. Ah already peed mahself once from drinkin' so much water in this heat."

"Oh. Well, good luck!"

As soon as Applejack hung up, she continued plowing the pigpen. She was very sweaty, and her smelly shorts were damp, except at the crotch, where they were soaking wet. But, she didn't mind. Just another regular day at the farm.

Sunset hung up as well. "Adagio's on her way. How's Applejack?"

"Busy. And wet."

"Oh. Let's try Twilight." She called Twilight's number.

"Hello?" said Twilight.

"Hi. Are you really busy at the moment?"

"Not particularly. Just reading a book."

"How would you like to time me and Rainbow Dash on a farting contest?"

"Ooh! I'd love to! When?"

"Right now."

"On my way!"

Sunset hung up. "She'll do it." She sniffed Rainbow Dash. "Phew, when was the last time you rinsed?"

"Five days ago. Two weeks after I wet myself when we were hanging out with Adagio for the first time."

Sunset sniffed again. "You still smell really bad."

Rainbow Dash chuckled. She did her best to hold in her flatulence.

Soon, Adagio and Twilight arrived. Adagio's pants and shorts were wet, having peed herself on the way here, and she smelled as bad as ever.

"How do I smell, Sunset?" said Twilight.

Sunset sniffed Twilight. "Almost as bad as Adagio. But not as bad as Rainbow Dash, or my farts."

"Great!" said Twilight enthusiastically. "It is kind of fun being a smelly girl. But I'll probably wash tonight. It's been a week, and that's how long I said I'd do my experiment for."

Twilight had been curious as to what it was like to be as smelly as Applejack and Adagio, so she hadn't washed or changed outfits since June 19th. She also turned down the air conditioning a little so she sweated more. She drank a lot of water because of this, which diluted her pee while she studied, so her shorts didn't smell of urine, and had dried by now, but they still smelled as bad as the rest of her.

Then, Sunset couldn't hold in her gas anymore.

PPPPPRRRRRRRT!

Twilight giggled. "Mind if I time Sunset's farts?"

"Sure," said Adagio. "I'll time Rainbow Dash's, then."

"And don't worry about not timing that first one," said Rainbow Dash. "Both of us are gonna fart for WAY longer than that! Ready Adagio?"

"Let her rip," said Adagio.

Rainbow lifted her leg.

FFFFFFFFFFFFRRRRRRRRRRRT!

"13 seconds," said Adagio. "You're off to a good start."

"Yeah, I held it in for quite a while before you got here."

"Let's see if I can top that," said Sunset.

BBBBRRRRRRAAAAAAAAP!

Sunset's explosive fart blew her skirt back. Twilight could see that she was wearing short skintight black shorts underneath.

"Nice... shorts, Sunset?" said Twilight.

"I figured I'd wear them with this dress in case I ever got into another farting contest with Rainbow Dash. I'm a little shy about anyone but Flash seeing me in regular panties."

"Well they look really cute on you," said Twilight, and Sunset blushed. She hoped Flash would think so too when they got together later this evening.

"You did time that fart, right?"

"10 seconds."

"That's what I thought."

Over the next twenty minutes, they held in their farts for a few minutes, and then would take turns farting for a long time. Their farts got as long as 20 seconds, and ranged from deep-pitched to high-pitched. Some of them were wet, but all were relatively loud. Twilight also opened the windows after the room started to smell worse than her or Adagio.

BBBBBBBBBBBBBRRRRRRRRRRRRRRRRRRT!

"25 seconds," said Adagio, once the loud, deep-pitched fart had ended.

Rainbow Dash chuckled, for this was the longest either of them had farted today.

Sunset stuck out her butt slightly.

PPPPPPPPPPPBBBBBBBRRRRRRRRRRRRRRRRRT!

Twilight giggled as she timed this equally deep, but wetter fart, which blew Sunset's skirt back as usual, showing off the outline of her massive butt under her shorts.

"28 seconds!"

"Not bad," said Rainbow Dash. "I'll have to try for something close to my record if I'm gonna win this contest!"

"Oooh, I have to pee," said Twilight, crossing her legs and fidgeting a bit. She had forgotten to take her morning pee today.

"I'm probably not gonna fart for another few minutes," said Rainbow Dash. "Go ahead."

"But what if you do fart and it's longer than Sunset's longest fart and you lose the contest?"

"I could time it if I had to."

"No, I'll stay here."

"But you might not be able to count if you really have to-"

She stopped as Twilight started to pee in her stinky shorts. Twilight giggled as the pee flowed down her legs and formed a puddle under her. "Oops... sorry, Sunset."

"It's all right," said Sunset. "It's not like I haven't wet myself here with Flash before."

Five more minutes went by, and they knew they'd run out gas soon.

"Hold on..." said Rainbow Dash.

PPPPPPPPPBBBBBBBBBBBBBBBFFFFFFFUUURRRRRRPPPPPPTTTT!

A boisterous, wet fart exploded out of her, longer than any of her farts today. Rainbow sighed in immense relief. "That HAS to have broken my record!"

"It's your record exactly," said Adagio. "34 seconds."

"Well, at least I'm back in the lead." She felt her butt. It felt slightly wetter, but there was definitely no mess in it.

"I've held this in longer than I usually hold in my farts," said Sunset. She closed her eyes tight...

BBBBBRRRRRRAAAAAAAPPPPPPPFFFFFFFFFFFRRRRRRRRTTTT!

Sunset let loose with a booming fart that wasn't quite as wet as Rainbow's but just as loud and just as long. Or at least almost as long. Maybe longer? She wasn't sure. Her skirt was blown back harder than ever until she was finally done farting, sighing of relief, and then turned towards Twilight.

"33 seconds," said Twilight.

"Well, that was my original record," said Rainbow Dash.

For another five minutes or so, they kept farting, until their gas was gone.

"Rainbow Dash wins!" said Adagio.

"Awesome!" Rainbow Dash shook Sunset's hand.

"Hey, would you mind giving me a bath?" said Twilight, feeling her wet shorts and sniffing her armpit. "I got what I wanted, knowing what it's like to smell bad, and I might try it again sometime. But right now I want to be clean again, and I'm really curious as to what it's like to get the same kind of bath that Rainbow Dash, Indigo, Fluttershy, Lightning Dust, and Adagio got."

"We'll start it up for you right away."

Sunset filled her tub with soapy water. Twilight took off her glasses, shoes, and socks, leaving her wet, smelly outfit on, and climbed into the tub and sat down.

"I'll do her hair," said Adagio. She poured a bucket of water on Twilight's head, soaking her top half, and started to lather her hair with shampoo.

Twilight didn't bother to say she had been washing her hair. She wanted to experience the full bath that some of her friends had taken.

Rainbow Dash washed Twilight's left armpit while Sunset washed her right armpit.

As the three girls scrubbed her, Twilight let out a sigh of satisfaction. She was really enjoying this. She could see why Fluttershy was so excited every day Rarity was going to give her a bath. Once she even wet herself, which was all right with both of them because Fluttershy was about to get wet and clean anyway.

Then Twilight farted in the tub. She blushed lightly and giggled nervously while the other girls laughed at the bubbles that appeared around her.

Once they'd finished scrubbing her hair and her sides, she got on all fours. Adagio scrubbed her back while Rainbow and Sunset scrubbed her butt, covering her in more suds.

"Maybe next time you'll go two weeks without washing and smell like me," said Rainbow Dash.

"I don't know if I'd go that far, but maybe," said Twilight. "But I'm definitely not going to smell as bad as Indigo."

Once they were done, she sat back down and lifted her feet on the side. Sunset scrubbed her left leg, Adagio scrubbed her right leg, and Rainbow scrubbed both her feet, making sure to clean every inch of them because they smelled as bad as her armpits. She got between her toes, and it tickled Twilight a bit, but she was able to keep still.

Then, Sunset turned on the shower to rinse Twilight off, and drained the tub. They patted her with towels and dried her off with a blowdryer while she put her glasses, shoes, and socks back on.

"How do you feel?" said Sunset.

"Great," said Twilight. "And clean." She sniffed Adagio. "Not like you." She sniffed Rainbow Dash and recoiled. "ESPECIALLY not like you."

Rainbow and Adagio giggled.

"Did you like that?" said Rainbow Dash.

"I loved it. It was really fun."

...

That evening, Sunset had dinner at Flash Sentry's house. Then, it was time for their usual activities. To her delight, Sunset was gassy again by the end of dinner.

"I need a butt massage," she said.

"Coming right up," said Flash.

Sunset got on all fours and Flash started to massage her rear. Sunset farted in his face. He paused to inhale deeply, and she farted again, blowing her skirt back a little.

"Nice shorts," said Flash.

"Sorry it's not regular panties, I just had a farting contest with Rainbow Dash and didn't really want to risk giving them a panty shot."

"No, it's fine, they make your rear end look really cute."

Sunset blushed. "Aw, thank you. Want to lift up my skirt for the rest of the massage?"

Flash did so immediately. He stared at Sunset's butt, which looked just as sexy in her skintight shorts as it did in her pajamas.

PPPPBBBRRT!

This short but loud fart reminded Flash what he was supposed to be doing, and he continued to caress Sunset's tush, while she continued to let loose with short yet explosive and sometimes wet farts.

After about ten minutes, Flash stopped rubbing Sunset's behind. "Can you sit on me and fart some more?"

Sunset only giggled.

Flash laid on his back, and Sunset sat on his chest, facing sideways with her knees up.

Sunset let out more loud farts, which Flash found very enjoyable, just like the last several times. He loved the way her butt vibrated against his chest with each fart.

Then Sunset said "I have to go to the bathroom."

"Then go," said Flash. "In whatever way you want."

Sunset giggled.

*pssssssssssssssssss*

Sunset let out a sigh of relief as she peed in her dress. Soon the crotch and butt of her shorts and skirt were drenched. Flash could feel his shirt getting soaked as his girlfriend wet herself on him. They both enjoyed the warm, wet feeling.

"Did you like that?" said Sunset once she finished peeing.

"Do you even have to ask after the last few times?" said Flash.

"Do you mind if I stay like this the rest of the night?"

"Not at all."