Rarity crossed her legs and fidgeted slightly in her seat.

She absolutely would not use public bathrooms, even in an emergency. She didn't think of them as very clean. She would only use toilets in her own house, or any of her friends' houses, or the rooms of hotels which she could trust the staff to have cleaned. But she would never, ever sit on a public toilet. Not in a gas station, a store, an arena, a theater, a plane, or a train. And not in school.

So, she would always hold it through the school day. Every single day. She'd always manage to stay dry to the end of the last class, and most of the time she made it with minimal discomfort.

But sometimes she didn't make it home. Or else, did, but lost it right on entering the bathroom. It would always be unpleasant for her but she preferred even this to sitting on the school toilets. She knew urine was sterile, however dirty it seemed, and however humiliating it was to wet oneself, though she'd never do it on purpose.

Today was a day when she wasn't sure whether she'd make it, because it was only the second class and already she was feeling the need to pee. This didn't surprise her. There was a math test the following class, and Rarity had stayed up late last night studying for it, getting much less hours of sleep than she usually did. So she had been exhausted when she woke up to the sound of her alarm, and although she had remembered to take her morning pee before her shower, she had drank a big coffee to stay awake, not to mention a big glass of water due to it being a hot day and having sweated a lot in her sleep.

Not only that, but her first class had been gym, which had taken place outside. Rarity had drank a lot of water to stay hydrated. While it was very common for her to faint, she did not want to do so from dehydration, even though she knew it would make her have to pee a lot more down the road. Some of the other students used the bathroom at the end of the course, and a few had asked to use the bathroom during the second class. But not Rarity. She was as unwilling to do this as Fluttershy, though for completely different reasons, and at least Fluttershy was willing to make a trip to the bathroom at recess or lunch.

Normally, as unpleasant as a pee accident was, it was not the end of the world. Usually there would be no witnesses, so Rarity would always shrug it off and feel better once she had a nice shower and was in a clean outfit. But today was the last day she wanted to wet herself. For immediately after school, she was going over to Applejack's house to spend the night with her. Applejack had seen Fluttershy wet herself... more times than she could count. She had seen Pinkie wet herself a few times and laugh it off. She had even heard of Sunset wetting herself twice. But she had never seen nor heard of Rarity wetting herself.

She had come close one time. When the girls were watching a movie together at the theater, Rarity had to pee, but as usual didn't want to use a public bathroom. Near the end of the movie was a jumpscare, which made both Rarity and Fluttershy wet themselves. Rarity's excuse was that she spilled her drink on herself, which she had actually done shortly after the wetting to hide the pee smell, and told a staff member that two seats needed cleaning. His reaction had implied jumpscare wettings in that movie were common. Applejack had said nothing to indicate that she knew the real reason Rarity's skirt was wet so she was sure she had gotten away with it.

Now of course, if she wet herself, in class or on the way to Applejack's house, she wouldn't be able to pass it off as a spilled drink this time.

She made it through the second course, after which was recess. As Fluttershy ran to the bathroom, highly likely to keep herself dry today, Rarity spent her time with Applejack.

"You all right there, sugarcube?" Applejack asked Rarity.

"I'm fine," said Rarity. "I'm just... really excited about sleeping over tonight."

"Aw, shucks, me too, Rares."

She managed to forget about her desperation for a time by talking to Applejack, and hid it well, she liked to think. Then the bell rang, and Rarity and Applejack went to their math course.

Rarity took the test with her legs crossed tight. She answered the questions as fast as possible, as if she thought she would get her relief as soon as she was done, even though she knew she'd have to hold it until she reached Applejack's house. Fortunately due to her extended studying last night she at least knew how to answer the questions.

She finished the test a little bit early, and fidgeted in her seat with her legs crossed until the bell rang for lunch.

Rarity sat at the cafeteria table with her friends, fidgeting hard. She wasn't always this desperate at lunch, but days where she'd had a lot to drink, she was. Her friends recognized the signs all too well.

"Rarity, you really gotta learn to use the school bathrooms," said Applejack. "One of these days you're gonna have an accident in that pretty li'l dress."

Rarity blushed. "I can hold it. It's preferable to those filthy school toilets."

"We all use them," said Sunset.

"Well I'd prefer not to."

"Suit yourself," said Applejack. "But people too stubborn to go to the bathroom when they need to will inevitably find it bitin' them in the butt."

Rarity ate her lunch a little faster than usual, and reluctantly drank down another bottle of water. She considered spilling a drink on herself again, but knew it would do no good, as if she was going to wet herself it would be in class or on her way to Applejack's house, neither of which would go unnoticed by her. She continued to fidget until the bell rang to go to her next class.

She crossed her legs and squirmed in her seat through the first afternoon class, and then the second one. She really needed to go, but before she knew it, she was half an hour away from her much-needed relief.

"Do you have to use the bathroom, Rarity?" the teacher asked.

Rarity blushed. "Yes, but I can hold it."

She continued to keep her very full bladder from releasing itself in her purple panties and skirt, while trying her hardest to focus on the lesson. She could tell she was making a big scene but she couldn't help it.

At long last, the bell rang. Rarity ran outside as fast as she could, and stopped next to the portal, holding herself and pee dancing while waiting for Applejack.

Applejack walked up to her. "Ready to go to my house?"

"You wouldn't believe how ready I am," Rarity said.

"What do you say we run there as fast as we can? I'm an athlete, and you look like you're fixin' to burst."

"That would be splendid."

Rarity and Applejack ran towards Applejack's house as fast as they could. As Rarity ran, she could feel the pee sloshing inside her. She had a very bad feeling about this. If she was this desperate on the way home, she usually didn't make it. What's worse, Applejack's house was much farther from Canterlot High than her own house.

They were about halfway there when Rarity started leaking into her underwear. She whimpered, but continued running. As long as no pee showed up on her skirt, she was fine.

They were only a few yards away from Applejack's front door when Rarity stopped in her tracks.

Applejack turned around. "Everything okay, sugarcube?"

Rarity stood still. She could feel that all-too-familiar feeling of warm wetness spreading through her panties, and it wasn't long before yellow waterfalls flowed down her beautiful legs and filled her boots.

Applejack blushed as the girl she liked peed in her dress in front of her. A wet spot was rapidly expanding on her purple skirt.

Rarity was blushing more profusely. She had never been so humiliated, not even when Sunset had posted a video of her asking a mannequin to kiss her to ruin her chances of becoming Spring Fling Princess. She was wetting herself in front of the girl she had a crush on. If Applejack had a thing for ladylike girls, this image was now ruined for her.

Eventually, Rarity finished peeing. She immediately began sobbing, tears pouring down her face. "Why-y-y? Of all the things that could happen, this is the worst... possible... thing!" She fell to her knees with her head in her hands.

Applejack walked over to her and patted her on the back. "It's all right, sugarcube. You can change into one of my outfits while I wash yours."

Rarity removed her hands from her face. "You're not... put off by what I just did?"

"Why would I be? Fluttershy and Pinkie do it too."

"But I'm supposed to be a lady."

"So? Ladies can have pee accidents too. It could happen to anyone under the right circumstances. In fact, one time I was too caught up in my work to take a bathroom break, and I ended up wettin' my shorts. A lot."

"Really?"

"I wasn't kiddin' when I warned you about people too stubborn to find a bathroom when they need one. Also..." Applejack chuckled. "I didn't fall for your little story about spillin' your drink at the movie theater."

Rarity blushed. "You knew all along?"

"Course I did. You had the same wet pattern on your cute little rear end as Fluttershy. And I like you just as much no matter how many times you wet yourself." She kissed Rarity on the cheek lightly and held out her hand to help her up.

Rarity took Applejack's hand, feeling much better now, and stood up. "If you must know... this isn't the first time I wet myself on the way home." She blushed more, but felt confident saying this to Applejack.

"That doesn't surprise me," said Applejack. "A few days I wondered how you made it through the whole school day at all, considerin' how desperate you looked."

Rarity giggled in spite of her wet state. "I guess in the end I'd rather risk wetting myself than use a school bathroom."

"You can wet yourself all you like."

"Promise you won't tell anyone?"

"I promise. Now let's get you cleaned up."

Rarity walked with Applejack towards the front door, her boots making squishing noises with each step.

...

After a shower, Rarity exited the bathroom in the outfit Applejack had picked out for her: A blue T-shirt and a tight pair of jeans.

"They look real good on you, Rares," said Applejack.

Rarity blushed. "Why thank you, Applejack." She handed Applejack her wet skirt and panties, and Applejack put them in the wash. Rarity would be ready to change back into them tomorrow after the sleepover.

Author's Notes:

In case I wasn't clear, this will be her original purple skirt, I kind of found that one more attractive on her than her new one.