I Can't Undress!

Sunset Shimmer, Rainbow Dash, and Rarity were enjoying a beautiful day at the park. They were currently sitting on a bench, relaxing. Sunset was wearing jeans, Rainbow Dash was wearing her usual compression shorts under a pink miniskirt, and Rarity was wearing short skintight purple shorts because it was June.

"Hey, I'll race you to that post and back," said Rainbow Dash.

"We all know you'd win," said Rarity.

"I won't use my super speed. I don't even have my geode with me!"

"That's good to know," came a voice.

Out from behind a tree stepped Adagio Dazzle, Aria Blaze, and Sonata Dusk, each holding a yellow gem in her hand.

"Whoa, didn't we destroy those gems?" said Rainbow Dash.

"Those aren't the same color," said Sunset.

"Brilliant deduction," said Adagio. "We found these in an old cave. They contain Equestrian magic."

"I tested them on Sonata and the results were really fun!" said Aria. "Well, not for her."

Sonata blushed and giggled nervously.

"What do they do?" said Sunset.

"You'll find out!" said Adagio. "Now fall under our spell!"

All three sirens held up their gems and zapped Sunset, Rainbow, and Rarity with a bright light.

"What on earth did you do to us?" said Rarity.

"You'll know soon enough," said Aria, and the sirens walked away.

Sunset, Rainbow, and Rarity checked every inch of their bodies to make sure they hadn't been altered in any way, and spoke to make sure their voices hadn't been taken.

"Their so-called magic must have just been a light show to try to scare us," said Rainbow. "I don't think it did anything to us!"

"Those ruffians really had me going for a second," said Rarity.

"Excuse me, I have to go to the bathroom," said Sunset.

She walked to the nearest park bathroom. Once she was inside and right next to a toilet, she tried to unzip her pants, but they wouldn't unzip. She tried as hard as she could but her zipper wouldn't budge.

"No no no!" she said, starting to panic. She was becoming more uncomfortable by the second, for she had drank a lot of water today after her morning coffee.

After about fifteen minutes of trying to unzip, she realized her jeans weren't unzipping any time soon, so she walked outside.

"My stupid zipper's stuck," said Sunset. "I'll have to hold it until I get home."

"We can always stop at my place," said Rarity. "It's closer."

"You go," said Rainbow Dash. "I'll stop by my house and drink some cider!"

Rarity and Sunset walked to Rarity's house, Sunset's need to pee increasing. She could feel her bladder getting more full every second, and was holding herself with both hands.

Once at Rarity's house, Rarity said "Do you mind if I try unzipping it?"

"Not at all," said Sunset. Rarity seeing Sunset's panties wouldn't be nearly as embarrassing as wetting herself. Besides, it wasn't as though the girls hadn't all seen each other in their underwear before. Even Fluttershy wasn't too shy about it around them.

Rarity grabbed the zipper of Sunset's jeans and tried to pull it down. It still wouldn't budge. Rarity grunted and pulled as hard as she could, but the zipper stayed stuck, while Sunset tried hard not to hold herself or cross her legs, or pee all over Rarity.

...

Meanwhile, Rainbow Dash was chugging down cider after cider, and then started to watch a Daring Do movie.

It wasn't long before all the cider went through her. She waited until this awesome action scene was over, and then she paused the movie and ran to the bathroom.

She tried to pull her shorts down, but something was wrong. They wouldn't come down.

Rainbow was starting to panic. Why wouldn't her shorts come off? As skintight as they were they'd never been too tight for her to pull down before, even when soaked with sweat as they often were. Had they shrunk that time she'd washed them with extra detergent after playing in the mud? Had she accidentally swapped them with a size too small?

She didn't care how her shorts had gotten too tight at the moment. All she cared about was not wetting them.

"Oh, I have to pee SO BAD!" she complained as she continued to pull as hard as she could.

...

"This calls for more advanced equipment," said Rarity, and she grabbed a pair of pliers.

"I REALLY hope this works!" said Sunset. "I REALLY gotta go!"

Rarity fastened the pliers around the zipper and pulled on it. No effect.

"Can I try?" said Sunset. "I'm afraid I might pee all over you. I don't know how much longer I can hold it."

"Of course, darling," said Rarity. "I do hope you make it."

Sunset ran into the bathroom, not even bothering to close the door, and tried to unzip her jeans with the pliers. "Come on, unzip! UNZIP! I REALLY NEED TO PEE!"

She frantically tried to unzip for fifteen minutes, her need to pee growing worse every minute. And then... her zipper broke off.

"No..." Sunset was frozen with shock. "No no no no no!" She desperately tried pulling her jeans down as they were, but, all zipped up, they wouldn't budge an inch.

She felt like she was about to burst. "Why can't I get my pants down? If this keeps up, I'm gonna wet my pants!" She paused to hold herself with both hands. She wouldn't last much longer. She needed to get her pants down NOW!

...

Rainbow Dash was still trying to get her shorts down. She noticed that, as hard as it was to pull them down, they didn't feel any tighter than usual. What made them so stuck?

She stopped trying to get her shorts down in order to hold herself with both hands. She fidgeted, feeling the pee slosh around inside her.

"I'm not gonna make it..." said Rainbow, whose bladder was very full after drinking twenty bottles of cider at once, and five before going to the park.

Her desperation reached a point she had never known before. Frantic, she tried pulling her shorts down again. As soon as she removed her hands, she started dribbling, rapidly dampening her shorts. Rainbow pulled harder, but then the next leak didn't stop, and she started peeing full force.

*pssssssssssssssss*

"Ahhhhhhhhhhhh..."

Rainbow couldn't help but sigh as she soaked her shorts and formed a puddle at her feet, rivers of pee flowing down her athletic legs. She'd be the object of ridicule if she couldn't get her shorts down to change afterwards, but for now she enjoyed the warm wetness.

In the middle of peeing, it suddenly hit her. The sirens' spell must have made it impossible for them to change out of their current outfits. That's why Sunset couldn't get her zipper down, it's why she couldn't get her shorts down when this was usually an easy task.

Rainbow walked into her room, still peeing, and picked up her geode. Putting it around her neck, she stopped to finish peeing herself, and then ran to Rarity's house using her speed.

"Rarity! Sunset! I know what the sirens did! They-"

Sunset was blushing beet red, and a wet spot was forming on her jeans which rapidly expanded. The wetness flowed down her legs, soaking her jeans further.

"I... I couldn't hold it..."

Rainbow could hear an audible hissing noise as Sunset continued to wet herself.

Sunset was less conscious of the sound than she was of the smell, and the warm, wet feeling on her crotch and legs, and the humiliation of it all. Even if the relief did feel nice. Her black panties were soaked. She felt ashamed beyond belief at having an accident in her jeans in front of two of her best friends.

Rarity put her arm around her back. "There there, Sunset, it's all right, I would have done the same in your position. Even Rainbow Dash would have..."

"Yeah, I did," said Rainbow, pointing at her wet shorts and skirt. "I couldn't get them down either."

"But your shorts don't have any zippers," said Sunset, still peeing.

"That doesn't matter. It was the sirens! They cursed us so we can't take off what we're wearing now!"

"They intended this to happen!" said Rarity. "Wait..." She tried to pull her shorts down, not caring that she was about to expose her underwear to Sunset and Rainbow Dash. Not that it mattered when both girls had wet themselves in front of her.

To her horror, they wouldn't go down. As tight as they were, they were stretchy and always easy to get down, but they wouldn't budge an inch.

"You... might be right," said Rarity after about a minute, by which time Sunset had finished wetting her jeans.

"What are we gonna do?" said Rainbow.

"Maybe it only lasts until we wet ourselves," said Sunset, and she tried pulling her pants down. Nothing.

"Your pants are still zipped up," said Rainbow, and she tried pulling her shorts down. Nothing.

"We'll just have to try cutting them off," said Rarity. "And not a moment too soon, for I need to use the bathroom too." She hadn't done so since her morning pee, and she had drank several glasses of water before the park.

"That'll work," said Rainbow. "I've got several spares. And I'll run home so fast no one will even see my underwear."

Rarity got the scissors around the fabric of the sides of Rainbow's shorts, staying clear of the wet parts, and started cutting.

The scissors had no effect.

"They thought of everything!" said Rainbow.

Now Rarity really needed to pee. She held herself and began fidgeting. She stopped for a few seconds to try to pull her shorts down, but it was futile.

"What do I do?" she said. She tried cutting her shorts off, but the scissors had no more effect with her than with Rainbow. She put both hands on her crotch and crossed her legs.

"Just go in your shorts," said Rainbow. "You can't get them off. Maybe the curse will break once all three of us wet ourselves."

"No, I can't! It's way too unladylike."

"Says the girl who farted in the tub with me three weeks ago."

"You know I didn't do that on purpose, and it was one time! Not like how you and Pinkie Pie do it every single time we're in the hot tub." Rarity was blushing, but right now her embarrassment at being reminded of this incident was overridden by her full bladder. "I really need to go... Help me!"

"As you wish." Rainbow started tickling Rarity's armpits.

"Hahahahahaha! Stop! Hahahahahahaha! What are you doing? Hahahahahahaha!"

Sunset grabbed a feather, lifted up Rarity's blue tank top to expose her midriff, and started tickling her sides.

"NO! HAHAHAHAHA! STOP IT! HAHAHAHAHAHA! I'M GONNA PEE! HAHAHAHAHAHA!"

Rainbow and Sunset tickled harder, and Rarity laughed harder. Her skintight shorts darkened, and yellow waterfalls gushed down her beautiful white legs.

They stopped tickling about five seconds after she started peeing. Rarity caught her breath, and then she heard the hissing noise, smelled the scent of urine, and felt the warmth flooding her shorts and the wetness flowing down her legs. She blushed beet red.

"Sorry Rarity," said Rainbow, "but you'd have peed yourself anyway. We just wanted to spare you the pain of holding it as long as we did."

Sunset nodded, blushing lightly.

"You're right," said Rarity, still feeling embarrassed, and still peeing. "I knew it was inevitable. I just couldn't let go on purpose. And it's not your fault. It's those uncouth sirens."

Sunset patted her on the back lightly as she finished wetting her shorts. She couldn't deny how the relief felt, but still felt ashamed at peeing herself, even though she knew it was only because of the sirens that she did. She felt how wet her shorts were and blushed lightly, while her legs glistened with pee.

"Maybe now the spell's broken," said Rainbow, and she tried to pull her shorts down. "Uh-oh... it STILL won't budge!"

"Are we gonna be stuck like this forever?" said Sunset.

"Oh, I sure hope not!" said Rarity.