Twilight groaned. She hated going to the dentist, even just for a checkup. Today it was exponentially worse - she had to get a cavity filled.

Not that she had a cavity filled before, but she'd read about the proceedure in a book and was almost forced to stop reading in horror. Almost. There hadn't been a book yet that could defeat Twilight Sparkle and this was no exception. In fact her muzzle was burried in another book right now, despite increasingly forceful requests that she get ready to leave the house.

"Twily!" Her mother, who shared her name, called out, "Get your purple butt down here, we're going to be late."

Twilight trudged down the steps like a mare on the way to the gallows.

Her mother sighed "I warned you not to read that book. You'll be fine. It won't hurt a bit."

"That's what adults say when they know it's going to hurt but they want you to be quiet."

Twilight senior rolled her eyes.

"I thought I told you to brush your mane?" She scolded, "Humph. No time now let's go."

The lavender filly's horn began to glow and, after a moment's concentration, a wave of magic flowed over her mane, straighting it out in an instant. She poked her toungue out at her mother and began walking down the steps before stopping in a moment of realisation. While reading she'd neglected a much more essential task than brushing her mane, and this one she didn't have a spell for.

She had to pee.

"Ihavetogotothebathroom." She mumbled as she started back up the steps.

"What was that?" Her mother asked. "Oh no you don't. Your book can wait until we get back. No reading and walking after what happened last time."

Twilight yelped as she was hoist into the air with telekinesis and placed back next to her mother.

"B-but." Twilight gave up. "Nevermind, it's fine."

She could hold it until they got to the dentist. She wasn't a foal anymore.

Twilight tried to walk normally, but she was starting to think her mouth had written a check her poor bladder couldn't cash. She knew her anatomy and she could tell her involuntrary sphincter was wide open, while her volunary spincter struggled to keep urine from leaking out of her overfilled bladder. Her bladder would be sending increasingly frequent signals to her brain, telling it to make her muscles squeeze, to empty her bladder and her higher brain functions were trying to surpress that reflex.

She- really needed to think about something else.

Her Mom chattered away but she couldn't focus on the words. Twilight's legs started shaking. It was getting pretty bad.

"I really need to pee..." She thought

"Mom?" Twilight's desperate situation finally overruled her shyness, " I have to go bathroom..."

Twilight wimpered and her hind legs twisted over one another.

Her mother rolled her eyes and sighed. "Really, Twily? You should have gone before we left. Anyway, we're already here."

Twilight glanced up and saw that they had indeed arrived at the dentist. Despite her earlier trepedation, Twilight was relieved to see the building. Wait, not relieved. Not the word to be thinking about right now - but she would be relieved when they went inside and she could finally release her aching bladder.

Twilight was no stranger to being desperate for the toilet. It happened all too frequently that she would get so caught up in a book that she neglected her body's basic needs, to realise, with very little warning, that her bladder was fit to burst. In such a situation, she had learned through painful experience, that trying to run would leave a trail of shame behind her.

So Twilight walked, careful not to jostle her bloated lower abdomen.

"Twilight Sparkle." The yellow receptionist pony waved them right through, "The dentist is waiting for you."

Twilight's eyes desperately scanned the waiting room, looking for a sign that lead to the bathroom, but she couldn't see one.

"Come on Twily, we're late." Her mother coaxed, "Let's not keep the nice ponies waiting."

"But mom!" Twilight whined, "I really have to pee."

Her mother huffed. "You're a big girl, you can hold it."

"I-I," Twilight blushed, "I'm not sure if I can."

"Just pretend you're reading a book." Her mother advised. "It's probably just because you're nervous."

Twilight groaned. And felt the vibrations from her voice shake her taut bladder, causing pain to radiate through her belly. Her nethers had long since gone numb.

"Ok." She said, in a much smaller voice.

She hadn't had an accident in a long time. Truth be told she wasn't sure about her limits. If she could just hold it until the dentist was done she could finally release her long held waters into a toilet.

No! Don't think about that! Twilight could swear she felt a dropplet of urine roll down her backside but nopony seemed to notice and she didn't want to draw attention by checking.

Twilight ever so carefully climbed up onto the dentist chair. Any pressure on her bladder now may spell disaster. She lay on her back, and, if anypony had been paying attention they would have seen her bladder was visibly distended from her belly. The dental hygienist rummaged through a drawer, and Twilight shifted in her seat, carefully. She couldn't move to suddenly, but she also couldn't stay completely still. The hygenist put a paper gown over Twilight to catch any spills from the proceedure.

How long did she have to wait? She needed to pee so bad...

The dental hygienist finally found what she was looking for, and turned to Twilght " All right, this is going to sting a little."

Twilight's eyes widened.

With how much she needed to pee she'd completely forgotten about the horrors she was about to endure.

Twilight grit her teeth as the dental hygienist injected the ibuprofen into her gums. The needle stabbing into her gums brought tears to her eyes, but amost immediately, she felt a wave of relief. The numbing sensation spread through her mouth, and she sighed.

Twilight crossed her hind legs beneath her gown, only to carefully uncross them when the posture made the pressure in her bladder increase. It felt like she was going to burst. The dentist started working on her teeth. Twilight tried not to focus on her bladder, but it was getting harder and harder.

The dentist was drilling and Twilight's bladder was about to burst. The vibrations seemed to travel through her bones straight into her bladder. She started to squirm more. The dentist noticed this and removed the tools from her mouth.

"You need to stay still. Is everything alright?"

"Uh, I need to go to the bathroom." She tried to say but it came out as a mumble.

"What was that, Twilight?"

The pain killer was making Twilight feel floaty, it was hard to think. Whatever, it would be fine.

Her kidneys mercilessly pushed more and more urine into her over-filled bladder and she started to feel lightheaded. The room was spinning and her abdomen felt really stretched. It was not fine.

"I need to go to the bathroom." She repeated, a little louder this time.

The dentist and the dental hygienist looked at each other. "Twilight, I don't think you should go." The dental hygienist said. "You're already really pale, and if you go to the bathroom, you might faint."

Twilight wimpered as her bladder pulsed ominously.

"It's alright sweetie you just have to hold it in for a little longer okay?" The hygineist consoled

She lifted up the filly's gown and noticed the poor girl's bladder was visibly distended even through her purple fur.

She gasped. "Doctor, I think she really needs to go!"

"Well she's just going to have to hold it in." The dentist ordered. "I'm not going to risk her passing out in the bathroom and hitting her head."

"Do you think you can hold it in a little longer?" Asked the Hyginist

Twilight's head spun and she squeezed her hind legs together. "I-I'll try."

The mare held Twilights hoof through the rest of the proceedure, gently encouraging her to keep holding.

"Alright dear," said the Hygenist, "We're almost done, just keep squeezing."

Twilight could feel her grip on her bladder beginging to fail.

"I-It's leaking out!" Twilight whined desperately.

"Doctor?"

"Alright, we're done." The dentist stated. "Watch her closely though."

They mare helped the purple filly carefully get up from the dentist chair. Twilight couldn't separate her back legs anymore. She limped forward with them tightly twisted together. Her abdomen felt bloated to the point she could hardly breathe.

The hyginist lead her to the bathroom, only stoping once she was sure the filly was safely inside a stall.

As soon as she stopped actively holding it, a jet of urine shot out with an audible hiss, striking the opposite wall. It took several seconds for her to notice she was missing the toilet, and several more for her to be in a state of mind to care; such was the relief that took hold of her body and soul. When the euphoria of release had faded suficiently she adjusted her aim, positioning herself to avoid making the puddle any larger.

The flow continued unabated for what felt like forever, but eventually it slowed. There was still urine left in her bladder but she had to activiely think about pushing it out.

Twilight sighed as she pushed the last trickle out, finally she was empty. Her kidneys hurt and her pelvic muscles ached, but compared to what she had just endured it was nothing. She did the best she could to clean up the puddle with some toilet paper.

Her mother was waiting for her in the waiting room

"What happened?" she asked.

Twilight shook her head, not wanting to talk about it. She was too embarrassed.

"I almost peed myself." She muttered, looking down at the floor.

"Why didn't you go before we left?"

"I had to go so bad, and you said I had to hold it!" Twilight said, her voice full of frustration. "It hurt really bad!"

"I'm sorry." Her mother said. "I didn't know it was that bad."

"You always do this!" She cried. "You never think about how I'm feeling! You're always so focused on appearances!"

Twilight's mother was taken aback by her outburst. She didn't know how to respond. She felt guilty for making her daughter go through this.

Twilight continued to rant.

"This is the worst thing ever! I hate going to the dentist! I hate this family! I hate everything!" Tears were streaming down her face and she was hiccupping from crying so hard.

"Let's go home." Her mother said, her voice soft. "We'll get you a book to make up for this."

Twilight nodded, still crying. She was so embarrassed, but she was also relieved. It was over. She could put this humiliating experience behind her.

On the way home, Twilight's mother tried to console her. "It's going to be okay." She said. "You're going to forget all about this soon."

Twilight doubted that. She would never forget this humiliating experience of needing to ask a stranger if she could pee. Speaking of which, he bladder twinged.

"I have to pee." Twilight said, interrupting her mother.

"Again?" Her mother said, exasperated. "Twily, you just went!"

"I can't help it!" She said. "I really need to go!"

"Okay, okay." Her mother said. "There's no bathrooms around here though."

Twilight's bladder was still weak from holding so much before. She danced on the spot in a very filly like way.

"How about you go behind that bush?"

"B-but what if somepony sees?" Twilight whined.

"I'll keep watch."

Twilight scurried behind the bush, her bladder was on the verge of another meltdown. It felt good to finally relieve herself. She was still feeling the buzz from the painkiller but it was starting to wear off.

"Thanks mom." She said as she walked out of the bushes, sighing.

"That's alright dear." Her mother said. "I'm sorry I didn't listen to you earlier. I should have known that you really needed to go to the bathroom."

Twilight nodded. She was still embarrassed, but she was relieved that it was over. Maybe now her mother would start listening to her when it really mattered.

Author's Note

No wetting version for Certificate.