Sunset Shimmer woke up one morning. Her alarm hadn't gone off, and when she looked at the clock, she noticed that it was 7:45. She had overslept. She rushed out of her bed, changed out of her pajamas into a white and pink shirt and a pair of jeans, and ate her breakfast, which included drinking some water, milk, tea, coffee, and juice.
Once she was finished breakfast, she ran outside to take the bus to school. Fortunately, she got there just as the bus arrived. So, she got on the bus on time.
The bus had just started moving, and Sunset had just breathed a sigh of relief, when she realized she needed to pee. She remembered now that she didn't take her morning pee because she was in such a rush. Not only had she drank a lot this morning, but she had also drank several cups of coffee to stay awake last night, because she had been studying until midnight for a test. All of that liquid made her need to go more, but she knew she could hold it until she arrived at school.
However, the bus arrived at school right when her first class was about to begin, so she couldn't use the bathroom before class. Worse, her first class was math, and the math teacher wouldn't allow anyone to go to the bathroom during class, especially not at the beginning of the day. So she knew she'd have to hold it for the entire hour of math class.
Sunset tried to hide her desperation. She didn't even think of asking the teacher, for she knew what the answer would be, and it would just reveal her situation to the class. She was pretty good at hiding her need to pee, at least for a while. She tried hard not to fidget, and to focus on the math lessons, and the worksheets that came with them, which was hard for her because her desperation had increased by then.
After an uncomfortable hour, math class was over. Sunset was relieved to go to her geography class, for the teacher there would let students use the bathroom. Once she had taken her seat and the class was about to begin, Sunset raised her hand.
"Yes, Sunset Shimmer?"
"Can I go to the bathroom? I have to go really bad." She blushed a little.
"You may."
Despite her need to pee, Sunset felt better as she stood up. She tried not to look desperate as she walked toward the door, but as soon as she was out of the classroom, she ran as fast as she could toward the girl's bathroom, holding herself with one hand. She wasn't sure she was going to make it.
She reached the bathroom, but to her horror, she saw the dreaded "Out of order" sign on it. She could not believe it. She had been so close to getting relief, and it was once again denied. She knew this would mean she would have to hold it until the end of the day. She wasn't sure if she'd be able to do that, already she needed to pee really badly, but she'd try anyway.
She returned to the classroom, still in desperate need of a bathroom, and sat down. As the geography lesson went on, Sunset felt the need to pee become greater. Surely what she had drank with breakfast was catching up with her. She fidgeted and slightly crossed her legs. But she tried to stay calm, wanting to hide her desperation. A couple of students noticed her movements, but didn't say anything.
After geography class was recess. Sunset knew she was still several hours away from relief, and tried to stay calm while holding it as much as she could. As she met up with the other girls, Sunset was unable to keep herself from fidgeting more.
Applejack noticed first. "Are you all right, sugarcube?"
"It's nothing," said Sunset, trying to stay calm but sweating a little.
"It doesn't look like nothin' to me." Applejack knew perfectly well what Sunset's movements meant. "You gotta go to the bathroom real bad, don't you?"
"Yes," Sunset admitted. "I have to pee REALLY badly, but I'll be fine."
"Why in Canterlot High haven't you gone to the bathroom yet?"
"The girl's bathroom is out of order."
"Then it's only a matter of time before more girls are desperate too."
"You don't know how much I've had to drink, nor how long I've been holding it." Sunset grimaced and fidgeted a bit more. The pressure in her bladder was growing stronger every minute.
"Oh. Well, ah hope you can hold it till school's out."
...
Sunset became more desperate as the day went on, and had a harder time hiding it. By noon, Sunset had been holding her pee for four hours. As she sat at the cafeteria table for lunch, she fidgeted harder and crossed her legs more than before. She could not believe she had held it this long, nor did she think she'd be able to hold it for much longer.
She tried to hide how desperate she was, but most of her friends noticed it by now.
"Are you all right, Sunset?" said Fluttershy nervously, for she was very worried about her.
"The girl's bathroom is out of order, so she's real desperate to pee," said Applejack.
"I myself am in need of relief," said Rarity, who was also crossing her legs tightly under the table.
"Try not to think about it," said Rainbow Dash. "Think about waterfalls! Big waterfalls flowing down into a lake! Fountains, with water pouring out endlessly! Rain falling, drops of water, splashing in puddles..."
Sunset moaned as she felt her bladder quiver, and crossed her legs even tighter. Rarity let out a whimper, and Sunset could tell she was feeling the same way.
"Rainbow, quit it!" said Applejack. "That's not funny."
Sunset ate her lunch and reluctantly had a glass of water to drink, and after lunch was science class. Sunset found it really hard to concentrate on the class; all of her attention was on her extremely full bladder, and trying her hardest to hold it. She was fidgeting more than ever now, and crossing and uncrossing her legs over and over again. She was more desperate than ever now, and it showed in her face. Many students noticed her, and were looking at her. Sunset blushed with embarrassment at this, but knew she had to do anything she could to hold her full bladder. If she wet herself in front of the class, it would just be even more humiliating, and she wanted to avoid that at all cost.
A few seats away, Rarity was fidgeting and crossing her legs as well. Sunset knew Rarity couldn't possibly be holding nearly as much as her, but she was still struggling to remain calm.
Though she got more desperate as time went on, she made it to the end of science class. Next was the final class of the day: English class. This was usually an easy class for Sunset, but this time, she was bursting to pee, and couldn't hide it anymore. As she fidgeted, more desperate than she was ten minutes ago, she noticed that Pinkie Pie was fidgeting a lot too, and crossing and uncrossing her legs. She was definitely desperate to pee too.
"I shouldn't have drank all that chocolate milk at noon," Pinkie muttered to herself.
Seeing how Rarity and Pinkie Pie were very desperate to pee only made Sunset's need greater. She was barely able to focus on the class, and crossed her legs tight, feeling as though she might burst at any moment. The teacher, naturally, noticed Sunset's desperation, but by now knew that the girl's bathroom was out of order so she said nothing.
After what felt like forever, the bell rang for the end of school. As soon as it did, Sunset stood up and rushed to the bus faster than Rainbow Dash could without her geode. She was dying to pee at this point. As she waited for the bus, she did the pee dance. She didn't care who was watching her, she just wanted to get home to get her much-needed relief. After a few minutes, which felt like an hour, the bus finally arrived, and she got onto the bus as fast as she could and took one of the seats near the front.
She crossed her legs and fidgeted as the rest of the students boarded the bus. Finally, it started to move. All Sunset had to do was hold it for the rest of the bus trip and she could finally get to her bathroom.
However, the bus ran into a great traffic jam. The bus barely even moved over the course of ten minutes. Sunset couldn't believe it. Did the world not want her to relieve herself? Was there an accident ahead? There would be an accident inside the bus soon if traffic didn't get moving!
She was sure she was seconds away from wetting her pants. But, after an hour, the bus finally got moving again, and stopped at Sunset's house. It was 5:00 PM. She had been holding it for nine hours. Sunset rushed into her house as fast as she could, and rushed into her bathroom. She fumbled with her zipper a bit but got it down, pulled down her pants and panties, sat on the toilet, and began peeing. The relief felt absolutely wonderful after holding it for so long.