Rarity woke up. She was having a sleepover at Applejack's house. She looked over at Applejack, who was still asleep on her bed.

The first thing Rarity noticed was a stomach cramp. This was likely what had woken her. There was no doubt in her mind what this was.

"Why does this keep happening to me?" muttered Rarity.

She got out of her sleeping bag. The bathroom was close to the bedroom and she was sure that when she took a dump, it would be very noisy and possibly wake Applejack up, thus risking her hearing these unladylike noises coming from her. So she decided to use the outhouse.

She tiptoed down the stairs, sweating a bit from the effort of holding in both her poop and the flatulence that came with it. She quietly opened the door, stepped outside, and closed it.

Now that she was outside, she was sure she could fart without Applejack knowing it was her. She let out a long, loud, wet fart, sighing of immense relief after holding it in for as long as she did.

She ran toward the outhouse and tried to open the door. It was locked.

Rarity groaned. "Not again! Whatever shall I do?"

She said this in a graceful and very feminine voice, but the short, boisterous, wet fart that followed took away from this.

She looked around for a bush or a tree she could go behind, and her eyes rested on Applejack's barn. The animals inside the barn did their business there all the time so she thought this would be a perfect place.

Rarity ran into the barn, farting a few more times along the way. Her farts were getting stinkier and wetter, and she also needed to pee.

Once she was inside the barn, she looked over and saw some hay bales. These would be perfect to hide her from view if anyone walked in on her.

She ran behind the hay bales, releasing a very dirty and wet fart as she did so. She knew she couldn't last much longer, she had gotten here in the nick of time. She pulled down her shorts and panties and finally let go.

She sighed as hyperscat noisily made its way out of her rear and onto the floor below her, and she started to pee. Occasionally the poop would stop, she would let out another wet fart, and start pooping again.

Once again the poop did not stop for a long time. She wondered whether she was getting a slight case of Megahyperscat. But, she did take pleasure in the release.

Until, eight minutes later, Sweetie Belle, Apple Bloom, and Scootaloo came in.

Rarity gasped and ducked below the hay bales, holding back her poop. What are they doing here? she thought. She took a quick peek at them over the hay. They were wearing their pajamas. They must be having a sleepover as well.

"That looks like a good place," said Apple Bloom with a bit of urgency in her voice.

"Thank goodness," said Sweetie Belle. "I don't think I can hold it any longer."

"Me neither," said Scootaloo. "I'm about to pee myself!"

Rarity froze with her mouth closed, her heart pounding. If the Cutie Mark Crusaders found her now, with her nether regions exposed and a pile of shit under her, it would be super embarrassing for her.

But, she could hear their sighs of relief from the other end of the barn, and was barely able to hold in her own. She was also having trouble holding in her poop, but she was able to keep any more from sliding out of her.

Less than a minute later, the Cutie Mark Crusaders started to walk out the barn. Rarity couldn't wait for them to leave so she could finish relieving herself.

"Hey, do you smell something?" said Scootaloo.

Rarity put her hand over her mouth, barely able to keep from letting out more scat.

"I think it's coming from that hay over there," continued Scootaloo. "It smells awful!"

"It's probably manure," said Sweetie Belle. "This is a barn, after all."

"Right, of course."

They walked out the barn door.

Once Rarity was sure they were gone, she let out a huge sigh of relief at them not noticing her. But, she wasn't done yet. She stopped holding it in and let her diarrhea and hyperscat continue rushing out of her butt, plopping wetly onto the floor below, with the occasional fart in between.

After about five minutes, Rarity was done. She pulled her shorts and underwear back up. Once again they felt very wet and dirty against her butt, but at least she had found the relief she needed.

She looked down at the mess she had made with disgust. She hoped Applejack wouldn't mind cleaning it up. But like Sweetie Belle said, manure in the barn was not uncommon so Applejack was probably used to it. She'd still be embarrassed knowing Applejack would eventually find it and have to clean it up, but at least she wouldn't know that it was her. At least she hoped she wouldn't.

She ran back to the house, entered as quietly as possible, and tiptoed to the bathroom. Surely a flushing toilet wouldn't wake Applejack up. Once she had quietly entered the bathroom, she pulled her shorts and panties down again and wiped her butt several times. She had to flush three times to avoid clogging the toilet.

She looked down at her underwear, dismayed to see a brown stain on them. She pulled her shorts back up, but at least her butt felt a bit cleaner. She accidentally let out one more loud fart, and put her hand over her mouth, hoping it hadn't woken Applejack. She also hoped this wasn't a signal that she needed to poop again, but after a few moments, she was sure it was just a fart.

She tiptoed back into the bedroom. To her relief, Applejack was still asleep. Rarity climbed into her sleeping bag, laying on her side, and went back to sleep.

Author's Notes:

To visualize this a bit more, I'll say she's wearing short, tight, purple pajama shorts and a matching midriff top, these are the pajamas I'll often use for her. And with pink panties underneath.