Twilight Sparkle woke up one morning. She remembered today was reshelving day, so she immediately got out of bed and started to reshelve them. She was so fixated on this she had forgotten to take her morning pee.

Once she was done, she looked at the clock. It was just time for her and her friends to race.

Rarity had insisted they wear lovely sporty outfits of her design for the race, so Twilight put on a sports outfit consisting of skintight black compression shorts and a dark blue shirt, and then made her way to the racetrack.

She hadn't had anything to drink today, and it was a hot summer day, so she drank five glasses of water before the race.

The racetrack was not circular - it was a long path, similar to the Running of the Leaves, and Spike waited at the finish line to see who would win.

Twilight ran, initially walking at a steady pace, until she was sure the race was about to end, and then she ran faster. The track was longer than she had anticipated, so she ran at maximum speed for about ten minutes. Rainbow Dash still won, with Applejack second, and Pinkie Pie third. Twilight did overtake Fluttershy and Rarity before crossing the finish line.

Exhausted, dripping with sweat, and very thirsty, Twilight drank about 20 glasses of water, and ten mugs of cider provided by Applejack.

"Congratulations, Rainbow Dash," said Twilight. "What time is it?"

"It's about time for the big event in Canterlot."

"Right, the one where I have to just stand and smile and wave."

Spike hopped on Twilight's back and she flew toward the train. It was a pretty long flight with how long their racetrack was. Twilight didn't fly too terribly fast though, relaxing after such a tiring race. During the flight, her sweat-soaked outfit dried off.

They boarded the train just as it was about to leave. Early into the train ride, Twilight realized she needed to pee, since she had drank a lot today. She got up and walked to the train bathroom, but to her dismay it was out of order. So she returned to the seat and sat down, fidgeting a little.

They reached Canterlot, and Spike stood at Twilight's side. She stood on a balcony, and important ponies walked by. Whenever they did, Twilight would smile and wave, though she really did not feel like smiling OR waving. Her need to pee was becoming greater, fast! She hoped this event would not last long so she could find a bathroom before the next event she had planned for the day, a buckball game in Appleoosa that she was to attend.

At one point, Twilight forgot to smile and wave, until Spike slapped her butt, and she smiled and waved at the pony that walked by.

The event lasted an hour, and Twilight held it in the entire time, becoming more uncomfortable each minute. Once the event was done, Twilight looked at the clock. The Buckball game was about a half hour away - the length of the train ride there.

Twilight returned to the train with Spike, and decided to try the bathroom again, hoping it was working again. Sadly, the sign was still there. Twilight moaned in extreme discomfort and sat back down, fidgeting more.

"Twilight, are you OK?" said Spike.

"I'm fine," said Twilight. "Why wouldn't I be?"

"You look like you really need to go to the bathroom!"

Twilight blushed. "I can hold it."

"I hope so," said Spike. "It would be SO embarrassing for a princess to wet herself!"

After an uncomfortable journey of fidgeting, the train reached Appleoosa, and Twilight sat at the guest of honor position in the bleachers while Pinkie Pie and Fluttershy played buckball against Braeburn's team again. Both of them had had a lot to drink after the race, yet neither of them were showing any signs of discomfort, and they were playing as well as they usually did. It was obvious they had found an opportunity to use the bathroom.

Pinkie Pie, Fluttershy, and Snails won, and Twilight immediately ran to an outhouse, only to find it lined up. She didn't want to wait in line; she had more things to do, such as stock up on items she needed at the store.

Twilight and Spike returned to the train. Twilight checked the train bathroom again. Still out of order. She crossed her legs and fidgeted harder. She really needed to go, but she wasn't about to find relief anytime soon!

Upon reaching Ponyville, Twilight raced to the store. She picked out a cart, and saw the bathroom just as she entered. She was sure she could spare a minute or two to go to the bathroom here before buying her supplies. She entered the bathroom, but found each stall to be full. She waited for the sound of a toilet flushing, doing the pee dance the entire time, but when the flush never came, she ran out of the bathroom.

"Well?" said Spike.

"I can hold it a little while longer," said Twilight. "Let's get what we need."

She found the items she needed and put them in her cart, including many quills and scrolls. Once she had picked up the last item, she walked to the checkout, deciding that she would use the bathroom before checking everything out, leaving Spike to guard the cart.

Until she saw a big line at the checkout. Twilight groaned. At this rate, she couldn't spare a second or she'd be late for a trade exchange in Fillydelphia she was to preside over. She wished she hadn't offered to take up the job, and let Luna take it instead.

Twilight did the pee dance the entire time she was in line, her desperation growing each minute. She had to pee so badly, and she didn't know how much longer she could hold it.

After what seemed like hours, Twilight reached the front, and paid for her items. After dropping them off at the castle, she quickly raced to the train, which was just about to leave.

She checked the train bathroom again, and groaned loudly when it was still out of order. So, she sat with her legs crossed tight, squirming the entire time.

She reached Fillydelphia just as the exchange was about to begin. She stood on the podium, overseeing the trade exchange and waiting for a pony to come to her with a complaint, which they never did. She wondered if princesses usually wore sports outfits to exchanges like this, but she had been too busy - and too desperate - to change out of it.

"How long is this exchange again?" said Twilight, unable to keep the desperation out of her voice.

"Three hours," said Spike.

Twilight moaned, and stood for the full three hours, initially keeping her desperation hidden, but after the first hour, she was frantically doing the pee dance, waves of pee sloshing around inside her.

"You know," said Spike when there were only 30 minutes left, "no one's coming. You can go to the bathroom here."

Twilight raced around the exchange and found an outhouse, but it was occupied. She ran back to the podium, and Spike could guess what was up from her continued discomfort.

"Was it occupied or out of order?"

"Occupied."

"You can just wait until it's unoccupied."

"What if someone wants to settle an unfair trade before I get back?"

"They won't."

"But what if they do?"

"I'll tell them you'll be back."

Twilight felt another jolt in her bladder. "All right. I'll be right back!"

She ran toward the outhouse again, but it was lined up with five ponies this time. She waited for her turn, doing the pee dance, but by the time there was only one pony in front of her, she didn't want to stay away too long so she ran back to the podium.

"What was it this time?"

"A line. It was too long! I couldn't wait that long!" She continued pee dancing.

Eventually, the exchange ended, and Twilight and Spike got back on the train, finding the outhouse to be out of order again.

After a long fidgety ride, the train reached Ponyville, and Twilight ran to her castle as fast as she could.

"TWILIGHT!" came a voice.

Twilight looked up as Rainbow Dash flew over to her.

"The flyer's competition in Cloudsdale is about to start, and Princess Celestia would like you to preside over it!"

"Can't she do it herself?" said Twilight. "I REALLY have to go!"

"I could tell her, but then she'd get there late."

Twilight groaned, and flew to Cloudsdale with Rainbow Dash. The pressure in her bladder grew heavier during the flight, and she was afraid she could wet herself at any second. She wished she had used the bathroom immediately at the trade exchange.

What's the point? Twilight thought. We all know Rainbow Dash is going to win! Why do they even need a princess there?

As they reached Cloudsdale, Rainbow Dash said "It's still a few minutes before the show. You can go to the bathroom now."

Twilight ran toward the nearest bathroom, but it was lined up. She frantically danced around while waiting for her turn, but just as there was one pony left in front of her, she could hear the announcer say the competition was about to begin, so she reluctantly flew over to her seat in the bleachers.

She fidgeted the entire time, barely able to pay attention to the competition. She sat in her extreme discomfort for an hour. Rainbow Dash was number 15, and she performed the Sonic Rainboom, winning first prize. Twilight would usually take in how lovely the Sonic Rainboom was, but she had to pee too badly to appreciate it.

"Rainbow Dash is best flyer once again!" said Twilight, and she immediately flew back to Ponyville, hoping to get to her castle and use the bathroom NOW!

As soon as she reached the castle, Starlight came out. "Twilight, there you are! Ember and Thorax are already here."

Twilight groaned. She forgot she was scheduled to attend a summit with Ember and Thorax at her castle. She entered the castle and made her way to a room where Ember and Thorax were sitting at a circular table, a little smaller than the map.

They talked about pony, dragon, and changeling affairs, and their alliances, for about an hour, while Twilight continued to squirm, in desperate need of a bathroom.

Her desperation was easily noticeable.

"Twilight," said Ember, "if you have to go, just go! We'll be waiting till you get back."

Relieved, Twilight immediately ran to the nearest bathroom, just as Pinkie Pie was walking out.

"I wouldn't go in there," said Pinkie Pie. "I just clogged the toilet!"

Twilight groaned and ran to the second nearest bathroom, but it was locked. She knocked on the door.

"Give me a minute," came Starlight's voice.

Twilight did the pee dance more frantically for about a minute, until she decided she had been away from Ember and Thorax for too long. She didn't want to be late for her next event. Hopefully the summit would end with enough time for her to relieve herself before the next - and last - item on the agenda.

She rejoined Ember and Thorax at the table. "I can hold it," she said, although she wasn't sure she could.

Before long, it was only a minute until the next train to Canterlot - the one that would arrive just in time for Twilight's last scheduled event, a meeting with the other princesses at Canterlot.

"This has all been wonderful, but I have to go to Canterlot right now!" She didn't mean to say it like this, but Ember and Thorax understood how desperate she was, and nodded.

Spike stayed behind to catch up with Ember, while Twilight boarded the train, Twilight hoping with all her heart the train bathroom would be fixed, but it wasn't. Her need to pee became even greater, and she could not believe she had held it this long.

Twilight reached Canterlot, and looked at the clock. The meeting was about to begin, so there was no time to go to the bathroom. She raced to the castle as fast as she could, and burst into the room where the meeting was taking place. Celestia, Luna, and Cadence were sitting around a table.

"I'm here!" said Twilight, sitting down in the only empty seat.

"Right on time," said Celestia. "Now, as you know, the Summer Sun Celebration is coming up."

As they talked about plans for the Summer Sun Celebration, Twilight squirmed harder than ever, whimpering a bit as she leaked into her shorts.

"Twilight, do you need to use the bathroom?" said Celestia. Stupid question - it was pretty obvious.

Twilight nodded her head, still fidgeting.

"You can go to the bathroom if you need to," said Celestia. "We're in no rush to finish this."

Feeling immensely grateful, Twilight ran to the nearest bathroom. As fate would have it, all the stalls were full. The ponies inside were taking their sweet time. Twilight did the pee dance more frantically than ever for five minutes, leaking at one point, without hearing the sound of a flush. She decided, again, to return to the princesses' side to avoid wasting their time.

A toilet flushed as soon as she was out of the bathroom.

"Feeling better, Twilight?" said Celestia once Twilight had returned.

"No," said Twilight. "But I can hold it." The princesses hadn't noticed the wet spot on her shorts, likely because they were black.

The other princesses avoided saying too much to Twilight, deciding that Celestia and Luna would mainly be in charge here. Twilight was grateful to this, for she didn't think she'd be able to catch whatever she had to do when she needed to pee so badly.

At long last, the meeting was over. Twilight ran to the bathroom, but by chance the stalls were full again, so with a frustrated groan she returned to the train.

The train bathroom was still out of order. Twilight sat with her legs crossed tighter than ever, fidgeting as hard as she could, for she was about to burst.

As the train got near Ponyville just as the sun was setting, she saw a pony walking back with the "Out of Order" sign in his mouth. At last, the bathroom was working again. Twilight immediately ran to the bathroom, but found it occupied. She waited just outside the bathroom, pee dancing as usual, but the train arrived in Ponyville before the pony inside was finished.

So Twilight immediately took off toward her castle. Once inside, she ran to the nearest bathroom, only to find Spike using a plunger on the clogged toilet. She had hoped this would be taken care of already. She started to run to the next bathroom, but leaked a little more. Not wanting to run all the way to the next bathroom, she quickly returned to the bathroom Spike was inside.

"Hurry up!" Twilight said, frantically pee dancing.

"Really, you still haven't gone to the bathroom yet?" said Spike. "I never knew a pony could hold it in for almost a whole day!"

Twilight just danced more frantically, dribbling a bit into her shorts.

"I think it's done!" said Spike about five minutes later.

Twilight couldn't wait, for she was at her limit, and her shorts were already a little wet.

As Spike flushed the toilet to be sure it was usable again, Twilight lost control. Another leak made its way out of her, which turned into a steady stream that only grew stronger and stronger. Twilight tried to stop, but she couldn't. She was peeing herself in front of Spike. Spike couldn't help but laugh, while Twilight blushed with embarrassment.

The warm wetness soaked her shorts, flowing in torrents down her legs, and forming a massive puddle under her. Twilight sat down, still peeing, and hanging her head in shame. The relief felt so wonderful, and something about the warm wetness felt a little good too. She would have enjoyed this if it wasn't such a humiliating situation.

She peed for about a minute and fifty seconds, and by the time she was done, her skintight black shorts were completely drenched, and she was sitting in a huge puddle, her face beet red.

"Maybe next time you won't plan so many events so close to each other!" said Spike.

"You're right," said Twilight. "I'll try to space them out a bit more next time. And take my morning pee. And not run a race like that at the beginning of such a busy day." She stood up, still a little embarrassed but feeling better, partly because of the relief and how much she had secretly liked the feeling.

"You did look kind of cute wetting yourself like that," said Spike, chuckling a bit and patting her pee-soaked tush.

Twilight blushed, but giggled a bit and went into her main bathroom to take a long bubblebath.

Author's Note

Yes, I realize there is an episode coming up where Ember and Thorax have never met and may not get along, but this story will ignore that for now.