Author's Note

Likewise, there is one fart scene here, but it's minor.

Peeing in Panties

"I need to pee," said Twilight. "How about you, Pinkie Pie?"

"Even after half an hour ago, I gotta go pee real bad!" said Pinkie.

"I win the farting contest!" said Rainbow Dash, slapping her butt with her hoof.

"Well, let's see if you win the holdin' contest," said Applejack.

They repeatedly filled two large mugs of cider and guzzled them down, showing each other the empty mugs so they knew they weren't cheating.

"I need to pee," said Fluttershy quietly, crossing her legs.

"I need to use the bathroom rather urgently as well," said Rarity. She paused to let out a loud fart that she suspected would be her last today.

They resumed rubbing each others' butts, trying to get into a relaxed position to lose control.

Twilight and Pinkie just sat with their legs crossed, waiting to get really desperate.

"Ugh, I don't think I can drink any more," said Applejack.

BUUUUUUUUUUUUUUURP! "Me neither," said Rainbow Dash. "Now I REALLY gotta go!"

Applejack and Rainbow Dash did the pee dance, each trying to avoid being the first to wet her panties.

Every two minutes this time, Rarity and Fluttershy would alternate between rubbing each others' butts. They could feel their need to pee increase with each minute. Any other situation they'd be desperate to avoid wetting themselves, but here they wanted to relax, ignoring the pressure in their bladders, and feel a loss of control.

About half an hour went by. Spike was eating popcorn, wondering who was going to have an accident first.

"I can't... hold it..."

Rainbow Dash sighed in relief as she wet her pink panties, enjoying the feeling of the pee flowing down her legs and forming a big puddle under her.

"Ah win!" said Applejack, and she started to pee in her panties as well. "Ahhhhh..." Their puddles joined together and rapidly expanded.

"You win this time, but only cause I really wanted the relief and couldn't wait a second longer," said Rainbow Dash.

Applejack raised an eyebrow.

"Actually, no, I really couldn't hold it," Rainbow admitted.

Fluttershy was rubbing Rarity's butt when Rarity finally lost it. She could feel her purple panties grow warm and wet, as well as a naughty pleasure from an involuntary loss of control. She sighed in relief as a puddle grew under her.

"All right Fluttershy, let's switch," said Rarity.

"I... I'm already peeing."

Fluttershy's front hooves were on Rarity's rear end, making her unable to hold herself, and as soon as Rarity had started peeing, Fluttershy had lost it as well. Her stream soaked her green panties and her back legs, making another big puddle to join Rarity's.

"I'm so sorry," said Rarity.

"It's all right. It's just as much fun peeing in this position as it would be if you were rubbing my butt." And she meant it, for whichever side of the butt massage she was on she was very relaxed. She let out a long sigh of relief and satisfaction, which reassured Rarity.

Twilight and Pinkie were really desperate now, and watching the other ponies pee made Pinkie leak a little into her already-wet panties.

"I think we're desperate enough," said Twilight. She stood up and let it all out. Her panties went from white to yellow as they became soaked, and the pee gushed down Twilight's legs. She let out a sigh of immense relief, though she hadn't had to go as badly as Rainbow Dash and Applejack had.

"Oooh!" Pinkie stood up and started peeing as well. "Ahhhhh..." Then she giggled at how funny it was that she and Twilight were peeing in their underwear.

Spike laughed some more. He couldn't think of anything funnier than ponies farting and peeing in panties. It was even funnier for mares to do it than stallions, though that was all he thought of it.

Each of them peed for a minute except Rainbow Dash and Applejack, who peed for three minutes. Once they were finished, their panties and back legs were soaked, there were some big puddles in the room, and they felt immensely relieved, as well as having taken extreme pleasure in wetting their panties. Even Rainbow Dash, despite having lost the holding contest to Applejack.

They sat in the puddles they had made on the ground - each pair's puddles were one early into their wetting - and waited until the final phase of their exercise could take place. Their panties were now completely drenched and smelled of pee and farts.