Author's Notes:

It goes without saying, this chapter is Equestria Girls

Rainbow Dash and Sunset Shimmer were having a sleepover at Rainbow's house. Both were wearing their pajamas.

"Sunny, truth or dare?" said Rainbow Dash.

"Dare," said Sunset Shimmer.

"I dare you to tell me your fetishes."

"Can't I do something else?"

"You have to."

"Well... I always fantasized that someone would spank me. Hard. At least 30 times. And then, massage my rear to ease the pain." She blushed, and then whispered the rest into Rainbow's ear.

"Wow. I REALLY wouldn't mind doing... I mean, sounds interesting."

Sunset raised an eyebrow.

"Dashie, truth or dare."

"Dare."

"I dare you to play out my fetishes exactly as I described them!"

"For real? Awesome!"

Sunset lay over Rainbow's knee. Rainbow had always wanted to slap Sunset's butt, and now was her chance!

Rainbow raised her hand and brought it down on Sunset's rear end. Sunset let out a squeal of pleasure. Rainbow continued to swat Sunset, and although her butt hurt after the 13th swat, she enjoyed it greatly.

SLAP! SLAP! SLAP! SLAP!

After 30 swats, Rainbow Dash let Sunset get off her. Sunset got down on all fours, rubbing her sore behind.

"Hey, I'm the one who gets to do that, remember?" said Rainbow Dash.

"Right," said Sunset. "Well, what are you waiting for?"

Rainbow started rubbing Sunset's tush. It was so soft, she loved the feeling of it against her hands and she rubbed as vigorously as she could.

Sunset also took great pleasure in this. She could feel the pain in her rear going away, but more than anything she liked the feeling of someone rubbing her butt.

Then, Sunset accidentally farted.

FFFFFRRRRRRT!

She blushed. "I'm so sorry Rainbow... I didn't mean to..."

"That's all right," said Rainbow. "That's one of my fetishes."

"It is?" said Sunset, who now looked less embarrassed and more intrigued.

Rainbow noticed this. "Sunny, truth or dare?"

Sunset knew where this was going, so without hesitation, she said "Dare."

"I dare you to drink a glass of water with a LOT of fart powder in it, and fart on me."

"Do you have any fart powder?"

"Of course I do! I LOVE to fart!"

"Can you rub my butt for a bit longer first?"

Once Sunset was satisfied, Rainbow got a big glass of water and sprinkled lots of fart powder in it. She had an entire stash of it hidden away. Sunset drank it quickly.

"Keep rubbing while we wait."

Rainbow resumed rubbing Sunset's butt.

About ten minutes later - ten really fun minutes for both girls - Sunset felt gassier than she had ever been in her life.

PPPPPPPPPFFFFFFRRRRRRRT!

She blushed lightly, but giggled. She knew Rainbow liked it, and Rainbow satisfied her fetishes.

After two more loud, boisterous farts, Rainbow said "Now, sit on my face and don't get up unless I either tap you three times or you fart seven times."

Rainbow laid on her back, and Sunset sat on her head. Rainbow loved the feeling of Sunset's butt against her face even more than rubbing it.

BBBBRRRAAAAAAP! PPPPPPPFFFFFFT! BBBBBBRRRRRT! FFFUUUURRRP! PPPPPRRRRRT!

Sunset let out five very wet, smelly farts. She could hear Rainbow's muffled screams from under her tush, but Rainbow wasn't tapping her so she knew she was fine.

After two more farts, Sunset stood up.

"Ten more times, or until you run out of gas!" said Rainbow, who was more aroused than she'd ever been in her life.

Sunset sat back on Rainbow's face and released a flurry of wet farts on her face. Rainbow enjoyed every second of it. Susnet's farts were stinkier than her own, but she didn't mind.

When Sunset got back up, she had Rainbow rub her butt again. Rainbow agreed. Sunset's pajama pants smelled like farts, and so did Rainbow, but Rainbow liked it. Sunset farted in Rainbow's face a few more times, and Rainbow playfully slapped Sunset's butt every time she did, which caused Sunset to giggle.

Once Sunset ran out of gas, they sat around for a while, thinking of how fun tonight was, until...

"Wait, Rainbow, there was one part of my fetish you haven't done yet."

"Right, I completely forgot." Rainbow started tickling Sunset's sides.

Sunset started to laugh really hard and fell to the ground. Rainbow tickled her harder.

"HAHAHAHAHAHAHAHA! STOP! HAHAHAHAHAHAHA!"

Rainbow didn't stop. Nor did Sunset really want her to. Rainbow started to tickle Sunset's feet.

"HAHAHAHAHAHAHA! NOT THERE! HAHAHAHAHAHAHA!"

Rainbow tickled harder, then sat on Sunset's lower legs, and tickled both feet with a feather.

"HAHAHAHAHAHA! STOP! I'M GONNA PEE! HAHAHAHAHAHAHAHAHA!"

Rainbow tickled even harder. Sunset laughed so hard, she wet her pants. Rainbow didn't stop tickling for another minute after Sunset finished peeing. She got off her. Sunset was out of breath, and wet from her accident.

"How was that?" said Rainbow Dash.

"It was perfect," said Sunset. She felt her wet pajama pants and blushed. "I hope that last part wasn't too weird for you."

"If you don't think it's too weird for me to want you to sit on my face and fart on me."

Sunset chuckled. "Oh, wait... I didn't bring a change of pajama pants. I never thought about that."

"It's no big deal," said Rainbow. "I can wash the sheets tomorrow."

Sunset and Rainbow got back to the regular activities of their sleepover, and then went to sleep, Sunset still in her wet pants.

By the next day, her pants had dried but still smelled of pee and farts. Sunset didn't mind though, and neither did Rainbow.