Rainbow Dash and Applejack finished a day of competitive sports. Exhausted, hot, and sweaty, they decided to cool down by drinking some cider at Sweet Apple Acres.
They talked for a while, until, on their fourth cider...
"I have to pee," said Rainbow Dash. "I've been holding it for a while."
Rainbow Dash ran into the nearest bathroom on the farm. After about half a minute, she came back out.
"Much better! Hey, remember that time Rarity held her pee all day? That was something I didn't expect to see RARITY do, and I have to admit, it was really fun teasing her about it, with all the waterfalls!"
"That reminds me," said Applejack. "One time ah talked with Spike, and he said that Twilight also had to hold it all day cause she never had the chance to get to a bathroom."
"Oh, I heard about that from Gilda! She said she saw Twilight pretty desperate when they were having dinner together at Griffonstone!"
"And once ah called Fluttershy to help with some animals, and she looked really impatient. Ah didn't say anythin' cause ah didn't wanna make her uncomfortable, but ah noticed she was really desperate to pee."
"So all three of them had to hold it for a really long time."
"Ah wonder which of the six of us could last the longest?"
"Totally me!" Rainbow Dash bragged. "I would obviously be the one who could hold it longer than any of you!"
"You might be able to hold it longer than Pinkie Pie, and MAYBE the other three, but not me! Most mares in the Apple Family have bladders of steel, and ah'm no exception!"
"Oh yeah? Then prove it! Let's have a competition tomorrow! We'll both drink lots of cider in the morning, and then hold it all day to see who can hold it longer!"
"Ah accept. And ah know ah'm gonna win!"
They spit on their hooves and did a hoof bump.
...
The next day, Rainbow Dash and Applejack met up at Sweet Apple Acres before sunrise. At 6:00 AM, they drank as much cider as they could, until neither could drink anymore. Rainbow Dash still wanted to win, but either way she loved getting the chance to drink so much cider.
Not long after sunrise, Rainbow Dash and Applejack already needed to pee. They both hid this from the other, not wanting to show any weakness so early in.
"Let's stay together the entire day to make sure neither of us uses the bathroom," said Applejack.
"Fine with me!" said Rainbow Dash.
They stood still for a long time, neither showing any sign of desperation.
"7:00! It's been one hour." Rainbow Dash sat down because standing was getting tiring. Applejack did the same, though they sat still, keeping track of the time so they knew how long they were holding it for.
Around 8:00, they began pacing around Sweet Apple Acres, though still showing no signs of how much they needed to go.
Finally, at about 9:00 AM, Applejack had her back legs really tight together. Rainbow Dash made sure Applejack was looking the other way, and crossed her legs tight, uncrossing them as soon as she was looking in her direction again.
Over the next hour, their need to pee increased, and they had a harder time concealing it, crossing their legs at every opportunity.
"10:00," said Applejack. "Let's go to Ponyville."
They walked into Ponyville, trying not to look desperate in front of the other ponies. Over the next two hours they walked through Ponyville, doing a few activities they planned to do today, all the while becoming more desperate. None of the ponies noticed their desperation.
After two hours, which seemed like two days to the desperate mares, they returned to Sweet Apple Acres and had lunch together, eating apples and hay burgers.
"Well, it's been six hours," said Rainbow Dash. "And I know I'm gonna win. UHHH!" She crossed her legs tightly.
"You were sayin'?" said Applejack. A twinge in her own bladder made her cross her legs tightly.
They ate their food rather rushed. Rainbow Dash could not keep herself from fidgeting when she was halfway done, and after about a minute, Applejack started fidgeting too.
Eventually, they finished, and as they walked back to Ponyville, holding their legs tightly together, Pinkie Pie suddenly ran right in front of them. Rainbow Dash and Applejack were startled and almost lost it there.
"Hey Rainbow Dash! Hey Applejack! Wanna come to a super super fun random party with me?"
"Sure," said Rainbow Dash nervously. "We'd love to!"
They ran to Sugarcube Corner at top speed. A few of the background ponies were there as well, and Pinkie began the party.
"Too bad none of the others could come," said Pinkie.
"Feel like usin' the bathroom here?" said Applejack quietly to Rainbow Dash.
"Not even a little bit!" said Rainbow Dash, but she was crossing her legs tightly.
They tried to hide their desperation and enjoy the party, though Applejack nearly lost it when she tripped and fell on Pin the Tail on the Pony, and Rainbow Dash was even more uncomfortable bobbing for apples, due to the water.
"Hey, are you two all right?" said Pinkie Pie. "You look really antsy about something."
"We're fine," said Rainbow Dash, sweating a bit.
At about 1:30, the party ended, and Rainbow Dash and Applejack ran back to Sweet Apple Acres, and sat down for a moment.
"What's the matter Rainbow, you can't hold it much longer?" said Applejack as Rainbow Dash was crossing her legs tightly and fidgeting a lot.
"Of course I can!" said Rainbow Dash. "In fact, I could even drink more cider and still beat you!" She drank two more mugs of cider, and looked at Applejack, who was crossing her legs very tightly and biting her lower lip. "What about you, AJ? Can you hold it long enough with a bit of extra cider?"
"Of course I can!" Applejack drank two more mugs of cider as well.
After about ten minutes, Rainbow Dash and Applejack could see each other getting more desperate, unable to hide it anymore. So, Rainbow Dash grabbed another cider and chugged it down. Looking a little nervous for a split second, Applejack did the same.
"It's almost 2:00!" said Rainbow Dash. "That means we held it for..." She paused to cross her legs tighter when she felt another twinge in her bladder. "Almost eight hours!"
"2:00?" said Applejack. "We were gonna try on outfits for Rarity at 2:00!"
They raced to Carousel Boutique, arriving at about 1:55.
"You're a bit early, but that's fine by me!" said Rarity, and she showed them each five new outfits they would be trying on.
"Ah can't wait," said Applejack, sounding more nervous and crossing her legs tight.
"Applejack, I thought you were all right with this."
"Ah am," said Applejack, pretending to be cheerful.
"Can we hurry this up?" said Rainbow Dash, who was fidgeting hard.
"Do you need to use the bathroom?" said Rarity, beginning to understand Applejack's initial reaction.
"No," said Rainbow Dash, crossing her legs and sweating.
"If you have to go, you can use the bathroom right here," said Rarity.
"We can hold it," said Applejack.
"You'd better," said Rarity. "I will be very miffed if you... go... in one of these outfits."
The first two outfits were dresses, like the ones they wore to the gala. These were easy to put on and take off, and plus, it would be hard for them to get wet if either of them lost it.
The next outfits were sparkly jumpsuits, but not too tight. Both were white, with blue sparkles for Rainbow Dash and orange sparkles for Applejack.
The next ones were skintight sparkly jumpsuits, which were torture for Applejack and Rainbow Dash to put on. Applejack's was dark red, Rainbow Dash's was dark blue. The tightness put some extra pressure on their bladders, and they crossed their legs very tight.
"Aw, you look so cute," said Rarity. "But don't wet those outfits!" she said in a more stern voice.
Rainbow Dash and Rarity were relieved to change out of these outfits. The last ones were sports outfits, consisting of T-shirts and skintight compression shorts - Moderate shade of blue T-shirt and dark blue shorts for Rainbow Dash, yellow T-shirt and red shorts for Applejack. These were even tighter on them than the previous ones and they both crossed their legs, fidgeting hard.
Rarity giggled for a bit. "You look smashing!"
"Is it over now?" said Rainbow Dash.
Rarity remembered the time Rainbow Dash had teased her when she had needed to go. "Applejack, you're good to go. Rainbow Dash, stand for another five minutes so I can make sure I fashioned them exactly to my liking."
"But what if I have an accident?"
"I shouldn't have been so fussy. It IS your outfit now, after all."
Rainbow Dash crossed her legs tight and fidgeted, biting her lower lip, while Rarity walked around her, examining every inch of her outfit.
"Everything's perfect!" said Rarity after the five minutes, slapping Rainbow's butt. Rainbow squealed and nearly lost it there, but she managed to hold it in.
Rainbow Dash quickly pulled her outfit off, then she and Applejack ran to Sweet Apple Acres with their new outfits.
"I'll leave mine here for now," said Rainbow Dash. "I'll take them home once I've won the contest!"
"You mean once I'VE won the contest!" said Applejack.
"Yeah, I don't think you can last much longer," said Rainbow Dash, feigning confidence while she was really more desperate than she had ever been in her life. "Especially with this!" She drank three more mugs of cider and gave Applejack a smug look.
Applejack drank three mugs of cider as well.
At about 2:45, Rainbow Dash started looking more nervous. "I REALLY thought you wouldn't last this long. I'm flying with the Wonderbolts in 15 minutes!"
"That'll be fun," said Applejack.
"What if I wet my flight suit in front of everyone? What if they kick me out? What if... Pull it together, Rainbow Dash! This'll be a snap! It's not like I haven't had to fly while needing to pee before!" But I haven't had to pee this badly before either!
"Where are you flyin'?" said Applejack.
"At Canterlot!" said Rainbow Dash.
They quickly boarded the train. Though the train ride was not long, they crossed their legs tight and fidgeted hard for the entire ride, sweating profusely.
"Princess Celestia's gonna be there," said Applejack. "You think you can hold it and perform well in front of her?"
"In my sleep!" said Rainbow Dash, but deep down she felt so nervous she almost peed right there.
They reached Canterlot, and Rainbow Dash and Applejack ran as fast as they could. Rainbow would have loved to fly, but she had to stay in sight of Applejack.
Frantically doing the pee dance, Applejack kept her eye on Rainbow Dash as she put on her Wonderbolts outfit. Rainbow Dash stood beside Spitfire and Soarin, ready to perform.
"Hey Rainbow Dash, you all right?" said Spitfire.
Rainbow Dash just nodded, crossing her legs and trying her hardest not to fidget.
"You should have gotten here earlier. Then you'd have had time to use the bathroom before the performance."
"I can hold it."
The Wonderbolts did their performance, showing off many great flight patterns. Applejack sat in the bleachers, her legs crossed tight, and biting her lower lip.
Rainbow Dash tried to forget about her desperation, and she performed her flight, if not as awesome as usual, at least above average.
Her flight suit was soaked with sweat, from a combination of holding it in and flying hard. Applejack briefly suspected she might have peed in her suit, but she realized if she did, it still would have been easy to notice, as she had watched her the entire time.
"What a wonderful show," said Princess Celestia as she walked up to the Wonderbolts once they stood still. She whispered into Rainbow Dash's ear. "Now that the show's over, you can find a bathroom. You must have to go really bad."
Rainbow Dash blushed a little, but peeled off her Wonderbolt suit and flew over to Applejack. "All right, we're done here! Let's go!"
After another very uncomfortable train journey, they were back in Ponyville, where they continued to hold it. They both had to pee so badly they could not believe they had held it in this time. Neither had tested their bladder's strength this much before.
"4:00," said Applejack, looking at the clock. "Ten hours! Feel like losin' yet?"
"I could hold it all day!" said Rainbow Dash. She put both hooves on her crotch, and Applejack laughed.
"Hey Rainbow Dash!" said Twilight Sparkle as she flew in. "I just got the new Daring Do book! Shall we read it together?"
"Uh... I'm kinda in the middle of... I mean... sure!"
"I'll come too," said Applejack. "Who doesn't like a good story from time to time?"
Twilight led her two desperate friends to her castle, and read the first chapter of the new book.
"All right Rainbow Dash, you read now!" said Twilight. "Rainbow Dash? Are you all right?"
Rainbow Dash held the book in front of her in an attempt to hide her crossed legs, but she couldn't keep herself from sweating and fidgeting slightly. Applejack was in the same position, except with no book in her hooves she couldn't hide the position of her legs.
"Do you two have to go to the bathroom?" said Twilight. "I once held it all day. It wasn't very fun. You should go now. You know where the bathrooms are."
"Nah, I can hold it." Rainbow Dash wasn't so sure. She could feel waves of pee sloshing around in her, and so could Applejack.
"Are you sure?"
"I'm just too excited to re-read this book!"
"Well, if you say so."
Rainbow Dash read the second chapter really fast. As she and Twilight read, Rainbow found it harder to focus on the book, as her bladder was throbbing with intense pain. She was thankful she'd read it already so she didn't have to really miss anything.
Applejack wasn't even terribly interested in the books, so this was even harder for her. All she could focus on was how badly she needed to pee.
By 5:00, the book was done.
"This was really fun Twilight, gotta go!" Rainbow Dash ran out the door, Applejack right behind her.
"Hey, aren't you gonna go to the bathroom first?" said Twilight. "They can be so stubborn."
...
"You feeling like peeing yet?" said Rainbow Dash to Applejack, back at Sweet Apple Acres.
"Not even a little bit." This wasn't exactly the most honest thing she had said, but she didn't want Rainbow Dash to know how desperate she was. However, her body language said it all.
"Anything else we have to do today?" Rainbow Dash asked this partially to distract herself a bit.
"At 5:30 I'm havin' tea at the new restaurant with Rarity and Fluttershy. They said ah could invite any ponies ah want."
"That'll make things interesting!" said Rainbow Dash. "And so will this!" She drank another mug of cider, and Applejack did the same.
At 5:30, they sat around a table at the tea restaurant with Fluttershy and Rarity. They couldn't help but notice that Rarity was fidgeting, though not as hard as they were.
"Um... Rarity, I think you should probably use the little filly's room," said Fluttershy timidly.
"No, I refuse to use a public washroom." Rarity crossed her legs.
Applejack and Rainbow Dash grimaced. Rarity's desperation, though obviously not as great as their own, reminded them of it, making their need to pee worse.
Rarity hoped Rainbow Dash wouldn't get back at her for last time by teasing her. But, she looked like she was in no fit state to. She must not have had the chance to go all day. A part of her thought it served her right, but they had (mostly) put this behind them now and she hoped she made it.
"Ah'll get the biggest cup of tea you got!" said Applejack.
"Are you sure?" said Fluttershy. "You... um... you look like you really... never mind." She blushed. "But, you can always go there." She pointed at the bathroom.
"No, I... I don't like using public washrooms," said Rainbow Dash.
"It's never been a problem before," said Fluttershy.
"Um... Rarity's rubbed off on us," said Rainbow Dash. "But, we'll probably get over it by tonight! Ow! I really need to pee!"
Applejack said nothing, but fidgeted harder.
Fluttershy and Rarity sipped their tea while Rainbow Dash and Applejack drained their teacups in one gulp and asked for another.
At about 6:00, Applejack said "Well, time for us to get some dinner!" She threw a few bits to Fluttershy. "That's for what we got." Then she and Rainbow Dash ran back to Sweet Apple Acres.
Both mares felt like they were about to burst, but neither was ready to give up. They each wanted to beat the other.
Applejack made the dinner for her and Rainbow Dash, a big selection of apple treats along with a sandwich. Her legs were crossed the entire time, and she was sweating quite a bit.
"Think you can make it?" said Rainbow Dash, fidgeting hard in her seat.
"Ah know ah can!" said Applejack.
"You two still need to go to the bathroom?"
Applejack and Rainbow Dash turned to see Apple Bloom in the doorway.
"Uh, yeah, but we can hold it!"
Apple Bloom didn't say anything, for she had overheard them talking about their competition.
After dinner, they stayed in their living room, trying their best not to burst.
"Ready to give up?" said Rainbow Dash.
"Not yet," said Applejack.
"I don't think you can hold it another minute!"
"Ah bet you can't last five seconds!"
Their desperation increased to a critical point, and they both put their hooves on their crotches, fidgeting more vigorously than ever with their legs crossed as tightly as they could.
"You OK Dash?" said Applejack at 9:00 PM, noticing Rainbow Dash's extremely desperate state.
Rainbow Dash couldn't hide her desperation even the slightest anymore. "I can't hold it anymore! I'm going to burst!"
"Me neither! Ah can't wait anymore!"
"Should we declare this a tie and just go pee?"
"Yeah, let's do that."
As fast as their legs would carry them, Rainbow Dash and Applejack each entered a different outhouse. After about two minutes, both exited the outhouse, feeling immensely relieved.
"We held it for 15 hours," said Rainbow Dash, looking at the clock.
"I'm mighty impressed you were able to hold it as long as me," said Applejack. "After all we had to drink."
"I don't think anyone can hold it as long as us!"
They did a hoof bump.