Author's Note

For this chapter, Sunset will be wearing a black T-shirt and jeans, Twilight will be wearing her Legend of Everfree outfit again (I'm sorry, it's my favorite for her), Rarity will be wearing a light blue tank top and short skintight purple shorts, Fluttershy will be wearing a white tank top and short skintight green shorts, Rainbow Dash will be wearing a white T-shirt and short skintight blue shorts, Pinkie Pie will be wearing a pink and white T-shirt and short tight jean shorts, and Applejack will be wearing a white and green T-shirt and short, tight jean cutoffs.

This was also suggested to me as an idea and I really liked it.

Mass Peeing in the Car

It was about a week after Sunset and Twilight returned from their week's camping trip. As they had planned, they had stayed in their pajamas the entire time and not washed, and whenever they needed to pee they went in their pajamas. They smelled really bad by the time they got back, and their pajamas were filthy and, in the case of their pants, smelled strongly of pee. They gave each other a bath in their dirty pajamas until they were sparkling clean, spending extra time scrubbing each other's butts of course.

Now, the girls were all on another roadtrip, this time, to the soccer finals, which Rainbow Dash would be competing in tomorrow. The city where it was taking place was three hours away and the girls all wanted to be here to cheer for her. They had often been in the audience when she would run a race. Sometimes if it was a really long race she would wet her shorts after drinking so much; the same ones she was wearing now. Neither she nor anyone else really cared; she always won and the audience always loved her.

Twilight was driving, and Sunset sat in the front seat. Rarity and Applejack sat in the middle, and Rainbow Dash, Fluttershy, and Pinkie Pie sat in the back, Rainbow between the other two.

Once again, it took a while for the van to cool down with air conditioning so they each got an extra large slushy before leaving the city. They knew the effect it would have on them but they didn't care. In Sunset's case, she was looking forward to it.

As they approached a gas station just over half an hour out of town, Twilight asked "Does anybody have to go to the bathroom?"

The girls all shook their heads and said "No" or "I'm fine".

However, only ten minutes later, they were all hit with a sudden and intense urge to pee.

"Oh come on!" said Rainbow Dash. "I couldn't have had to pee ten minutes ago?"

The girls all fidgeted. Sunset and Twilight were the only ones who really had an interest in wetting, though Pinkie would enjoy it whenever it happened to her. But at this point they were all familiar with it, in part due to Sunset wetting herself all the time, and in part due to each of them having wet herself at least once.

Sunset waited a few moments, enjoying her desperation, then sighed in relief as she wet her pants. Everyone could hear her stream spraying her jeans, and everyone could smell her pee. Sunset enjoyed both as she felt the warm wetness spread through her crotch and butt.

Twilight was in desperate need of a bathroom but smiled as she knew Sunset was having fun. She leaked a little, dampening her shorts, but held the rest of it in.

"Sunset's peeing her pants!" said Pinkie. "I gotta go potty really bad, and I don't see why I can't follow her example!" Pinkie uncrossed her legs, stopped fidgeting, and peed in her shorts. She sighed of relief with a look of absolute pleasure on her face, though more for the relief than the act of peeing herself, but she was definitely enjoying this.

Rainbow chuckled a bit, then whimpered and crossed her legs, fidgeting tight. "How are you holding up, Fluttershy?"

Pinkie laughed at Rainbow's unintentional pun, and her stream grew stronger.

"I... I really have to go," Fluttershy said quietly, crossing her legs and fidgeting.

"Think you can hold it till the next gas station, Rares?" Applejack asked Rarity.

"Heavens, no," said Rarity. "I've told you a million times, I don't use public washrooms. They're so filthy. I'd rather go in my shorts." She held herself with both hands and moaned.

"Looks like your only options are one or the other," said Applejack. "Unless you think you can hold it another two hours."

Rarity responded by peeing her shorts. She sighed in relief as her crotch and butt became very wet. She knew she was being very unladylike but she didn't mind. It wasn't her first time, and wetting was no big deal for them.

"Feel better, Rares?" Applejack asked when Rarity finished peeing.

"Much better," Rarity said cheerfully. Her shorts were soaked but the relief felt so good.

"We might as well be wet together." The sound of a strong stream spraying denim could be heard as Applejack's jean shorts darkened rapidly and she sighed of relief.

"Awwwww," said Rarity with a smile.

"A little pee ain't no big deal," Applejack said unabashedly with a wink.

"It's rather a lot of pee, but I know what you mean."

"R... Rainbow Dash?" Fluttershy said timidly, holding herself and fidgeting lightly.

"Yes, Fluttershy?" Rainbow Dash replied, crossing her legs and fidgeting harder.

"I... I really don't think I'm gonna make it."

"You're sure this is gonna end wet for you?"

"Yes."

"Then let's pee on three. Sound good?"

Fluttershy blushed lightly but nodded.

"One... two... three."

Rainbow uncrossed her legs, Fluttershy stopped holding herself, and both desperate girls stopped fidgeting as they peed full force in their skintight shorts. They sighed of relief as their bladders grew emptier and their shorts grew wetter.

"You doing all right, Fluttershy?" Rainbow asked after a minute, still peeing.

"Mm-hmm." Fluttershy was blushing but smiling and leaning against Rainbow as she wet herself.

After about another minute, Rainbow and Fluttershy finished peeing.

"Ahhh, that's better," said Rainbow.

Fluttershy enjoyed the feeling of relief. She didn't care that she had peed herself and soaked her shorts. It was hardly her first time, she enjoyed peeing her wetsuit, and the other girls wet themselves from time to time too, and in Sunset's case, all the time. Besides, she kind of enjoyed wetting with Rainbow Dash, though they likely wouldn't get into the habit of doing it all the time as Sunset did.

"Well, since all of you wet yourselves, I suppose I might as well join you." Twilight sighed as she wet her shorts.

Sunset chuckled to herself as she saw the wet spot rapidly expanding and Twilight's seat being flooded. She knew Twilight really enjoyed this, and all her friends having wet themselves just now gave her the perfect excuse to do the same.

"Aw shucks," said Applejack. "I forgot to pack my pajamas."

"Me too," said Rarity.

"Me three!" said Pinkie.

"I may have forgotten to pack them too," said Rainbow Dash.

Fluttershy just giggled nervously.

"Me too, and I was so looking forward to wetting them tomorrow morning," said Sunset. "If they have mattress protection at the hotel, of course."

"I guess we're staying in our wet outfits the entire trip," said Twilight.

The girls all laughed. While most of them still didn't have a particular interest in wetting, they found this amusing and somewhat fun all the same.

...

An hour later, they stopped at a fast food restaurant and ordered some lunch. Then they continued on their way.

Four minutes later, Pinkie let out a series of wet farts.

"Pinkie!" said Rarity, for she was stinking up the van.

"Sorry," she said. "What I ate really didn't agree with me."

Rainbow Dash lifted her leg and let out a deep-pitched wet fart. Twilight opened all the windows of the van.

Over the next few minutes, Pinkie's farts grew wetter and stinkier. She knew the effect her food would have on her, but she didn't care, she loved it so much, and as no one had batted an eye at Applejack's messy accident at her wedding, she figured it wouldn't be a big deal if she did the same thing.

Which, eventually she did. Pinkie let out a very wet fart that, seconds in, released explosive diarrhea into her shorts. She simply giggled as she pooped herself uncontrollably.

"Oh my," said Rarity, fanning the air but not being overly put off by it.

"Looks like I had an accident in my shorts," Pinkie said with a smile. She let out a sloppy wet fart and soiled herself a little more.

"Ooh... Don't make me think about it," said Rainbow Dash. "I really have to go too." She let out a dirty wet fart.

"Then just go in your shorts, Dashie! It's not so bad!" PLORP! Pinkie giggled.

"Oh, why not?" Rainbow grunted and noisily pooped her shorts with hyperscat. She then sighed of relief.

"Feel better?" Fluttershy asked with a smile.

"Way better," said Rainbow Dash. "In fact... I actually really enjoyed that." BLART! She chuckled as she soiled herself a little more, and wiggled her butt in her mess. "You don't mind, do you Fluttershy?"

Fluttershy kissed her lightly. "Not in the least." She let out an airy fart and blushed but giggled.

...

Their shorts, in Sunset's case, pants, had dried by the time they arrived at their hotel, though of course Rainbow and Pinkie's shorts were still messy. Sunset walked into the lobby to check them into the hotel.

"Two rooms," Sunset said. Each room had two beds; one bed each for Sunset and Twilight, Applejack and Rarity, Rainbow Dash and Fluttershy, and Pinkie. "Three beds will need mattress protection. Two of my friends soiled themselves on the way here and didn't bring a change of clothes. And I wet the bed. A lot."

The clerk looked a little surprised, not only by the fact that Sunset wet the bed, but how casually and loudly she was saying it, as if it was no big deal, not to mention there was someone within earshot behind her. But she quickly recovered and said "We'll get those set up for you."

...

Twilight and Sunset shared a room with Rarity and Applejack, and Rainbow Dash and Fluttershy shared a room with Pinkie Pie. Fluttershy really didn't mind Rainbow and Pinkie's smell, and cuddled with Rainbow that night. Rainbow soiled her shorts again before they fell asleep, and that morning, Sunset took her morning pee in bed, in her jeans. Twilight peed with her. She'd just tell Rarity and Applejack that all the pee was Sunset's.