It was a few nights later. Fluttershy and Rarity met up at Rarity's house after a day of fun with their friends. They were wearing their usual dresses this time, with a green skirt for Fluttershy and a purple skirt for Rarity.
"Spending time with my friends is always fun, but I am quite relieved to be alone with you now," said Rarity. She lifted her leg.
FFFFFFFFFFRRRRRRRRRRRRRRRRT!
A loud fart made its way out of her, lasting several seconds. She sighed in immense relief when she was done.
Fluttershy giggled, and lifted her own leg.
PPPPPPPPPPPPPFFFFFFFFFFFFFFFFFT!
"Nice one, Fluttershy," said Rarity. "That was almost longer than mine. Ooh! We should have a farting contest!"
"That sounds fun. How does it work?"
"Let's do two contests. First, we'll see who can fart the longest in the course of 15 minutes. Then, over another 15 minutes, we'll see who can fart the loudest. Each time, the winner gets a spanking from the loser for breaking wind in such an unladylike manner." She winked, and Fluttershy felt motivated to win.
Rarity sprayed air freshener in the room and set an alarm for 15 minutes. "The contest has begun. First is the contest of length. Would you like to go first?"
Fluttershy closed her eyes tight, and let out a short but loud fart.
"That's... not a bad start," Rarity said politely. She farted slightly quieter but a few seconds longer than Fluttershy.
Fluttershy let out three shorter farts. Rarity farted for three seconds.
After a while, they would pause between farts, and their farts would get longer.
"Ooh, this one might win this round right now," said Rarity. She turned around so she was facing away from Fluttershy and stuck her butt out a little.
PPPPPPPPFFFFFFFFFFFRRRRRRRRRT!
The force of this fart blew Rarity's skirt back so that Fluttershy could see her purple underwear. "Nice panties, Rarity," said Fluttershy with a giggle.
"Why, thank you," said Rarity once she finished farting. "By my count, that's nine seconds."
"Oh my, I don't know if I can beat that."
"You can try. You're having fun either way, right?"
Fluttershy nodded. Feeling another big fart coming, she turned around and did the same pose as Rarity.
BBBBBBBBBBBRRRRRRRRRRRRRRRRRT!
This fart was as loud as Rarity's, but much deeper-pitched, and it also blew Fluttershy's skirt back. Rarity got a nice view of her green panties underneath, and was almost surprised to not see a brown stain on them.
"Did you like that?" said Fluttershy once she was done.
"I most certainly did," said Rarity.
Fluttershy giggled, farting again for about a second. "I counted ten seconds, so I think I'm winning now."
"That does sound about right." Rarity let out another fart that lasted seven seconds and blew her skirt back again.
After several more farts, most of which were long but all of which were shorter than ten seconds, the alarm went off.
"You win the farting contest of length," said Rarity. "Now, over my knee, you dirty, unladylike girl." She winked again and sat down.
Without a moment's hesitation, Fluttershy got over Rarity's knee. Rarity raised her hand and slapped Fluttershy's butt. Fluttershy let out a squeal of excitement. Rarity spanked Fluttershy again, and again, making sure she slapped exactly as hard as Fluttershy liked.
After the fifth swat, Rarity put her hand on Fluttershy's skirt and started to lift it, but hesitated.
"Do it," said Fluttershy.
Rarity lifted Fluttershy's skirt, getting a closer look at her green panties. They smelled like farts but were otherwise clean. Rarity rubbed her hand on Fluttershy's butt for a few seconds. Until Fluttershy farted, signalling Rarity to continue the spanking and slap her butt again. Fluttershy stopped squealing and closed her eyes with her mouth open in a smile, greatly enjoying this.
After ten swats with her skirt lifted, Rarity set Fluttershy's skirt down. She stood up and released a silent fart, making sure she still knew how to fart silently. Fluttershy did the same.
"Now it's time for the contest of volume," said Rarity. She set the alarm for another 15 minutes. "Begin!"
Fluttershy let out a high-pitched fart.
Rarity farted twice as loud, and slightly shorter. "Remember, length doesn't matter this time, so fart harder."
Fluttershy took this advice, and a second later, a very loud fart made its way out of her.
They continued to fart, and in the last five minutes, Rarity waited a bit before farting again.
PPPPPPPPBBBBRRRRT!!
This was the loudest fart yet, blowing her skirt back, and Rarity was sure it could have beaten her record in the previous round if she hadn't farted as hard as she did now. Even after the rest of the contest she was a little surprised that a noise like that could come out of someone as ladylike as her.
"I think you won, but I'm not done yet." Fluttershy waited a few more seconds until the pressure got intense, and let loose.
FFFFFFFFFRRRRRRRRRTTTT!
This fart was a bit longer than Rarity's, but was slightly quieter. It was still the second loudest fart today, but they both knew Rarity was still winning.
After four more minutes of farting, the alarm went off.
"I win!" said Rarity.
"Now, over my knee, you stinky girl." Fluttershy sat down on the couch.
Rarity got over Fluttershy's knee, accidentally farting from excitement, for Fluttershy had not given her a spanking like this before.
Fluttershy did what Rarity had done. First, she slapped Rarity's butt with her skirt up. "Was that too hard?"
"It wasn't hard enough."
Fluttershy slapped harder, and Rarity let out a sigh of pleasure. Fluttershy swatted Rarity's rear four more times, then lifted her skirt up, also getting a closer look at Rarity's stinky underwear, and spanked her again. Her butt felt so soft even when she was hitting it this hard, and she was enjoying this as much as Rarity.
Ten swats later, Fluttershy stopped. Rarity farted again, causing Fluttershy to slap her behind one more time before she got up.
"That was fun," said Fluttershy.
"It certainly was," said Rarity. "Now, how about we take a bath in my hot tub and fart under the water?"
"That'd be fun. But can we not undress entirely? I like it when you can see my underwear, but I'm not sure I'm ready to show you any of those body parts yet."
"I don't think I am either. How about we wear our dresses in the tub, and while we let them dry, we put on our smelly sports outfits?"
"That sounds lovely."
Rarity filled her hot tub with warm water, and she and Fluttershy climbed in and sat down. A few seconds later, bubbles appeared around Rarity. Fluttershy giggled, and farted in the tub as well.