As the bright light blinding her finally faded, Twilight found herself dazed and confused, head spinning as she lay sprawled out over a large pile of unsorted books.

"Ughh, well that wasn't supposed to happen..." She groaned, rubbing a sore spot on the top of her head before fumbling up to her feet.

"What... what went wrong?" She wondered aloud, looking around at the inside of the Ponyville library and grimacing at the mess her failed spell had just created.

Almost every book from every shelf had been violently yanked off and dumped into numerous messy piles scattered about the room. It was going to take her hours clean and reorganize it all again, and unfortunately, she wouldn't have Spike around to help her do it either.

Said little dragon was over at Rarity's place for a sleepover with the CMC that he'd been very eager about. Though it was safe to say it probably had something do with a certain fashionista being there as well. The CMC had been remarkably eager to get his help with some new scheme of theirs that aimed to finally earn them their cutie marks.

'I just hope he's staying out of trouble.' Twilight sighed, knowing all too well what kind of crazy mischief those three 'crusaders' were capable of getting themselves into.

Shaking her head, Twilight started picking up books with her magic. As she was doing this, she pondered what could have possibly gone wrong with her spell for it to have had such a violent reaction like that. Unless it was a particularly powerful spell, most just fizzled out harmlessly if not performed correctly. But, as she followed this train of thought, she made a startling realization.

'What spell was I even trying to cast in the first place?'

Pausing her clean up for a moment, she concentrated and tried to think back to what she had even been doing before this, only to come up completely blank! In fact, she couldn't remember a single thing from at least the past twenty minutes! The last thing she could remember doing was sitting upstairs, writing this week's letter to Princess Celestia.

A sense of panic started to rise in Twilight's chest as she contemplated what all of this could mean. Was the sudden loss of her memory an unintended consequence of whatever spell she'd been trying to perform backfiring on her?! It seemed like the only logical explanation. Had it erased anything else?!

"Okay Twilight, calm down for a second and think." She said aloud, taking a moment to close her eyes and slow her rapid breathing, using a technique her old foalsitter had taught her. "My name is Twilight Sparkle, I am a student of Princess Celestia, I have a big brother who's captain in the Royal Guard, and I really don't like cheesy foods... or ladybugs..."

The thought of those last two things caused her to shiver uncomfortably.

She made a few more quick checks before sighing in relief. It didn't seem like she'd actually lost anything important. But she was determined now! She needed to figure out what she had been doing to warrant casting as spell complex enough to carry this kind of risk!

The thought momentarily crossed her mind that the answer could lie in one of the many books on the ground around her. It was possible that she'd merely found something a spell in one of them and just decided to try it out. It certainly wouldn't be the first time something like that had happened.

Unfortunately, there was no way of telling which one of them was the one. It was a long shot as it is, but right now she didn't really have any other clues to off of. The only way to find out would be to clean all this mess up and hope it revealed something.

'Maybe I'll start remembering things as I clean. I can't think straight in this mess anyway...'

About twenty minutes went by, and Twilight still had absolutely no idea what happened.

In her rush to find something amongst the mess, she had at least managed to tidy up the library in what felt like record time, but new in the end, nothing new was revealed. And now with everything sorted and back in its proper place, she had nothing left to do but go upstairs and hopefully find something there. After all, it was the last place she could remember being.

Upon reaching the top of the stairs, Twilight peered around the upper floor for anything obvious, but it looked just the same as it always did. There were no signs of trouble, not so much as a note left on her desk or a single book out of place.

She hated being left at a dead end like this, the mystery still pounding at her brain but with nowhere left to take it. She very briefly considered using Starswirl's time travel spell to go back and find out that way, but quickly decided against it. The last thing she needed was to accidentally screw up and destroy all of time and space.

Glancing up out the window above her bed, she could see that it was already getting quite dark outside. Perhaps it would be better if she got some sleep. If nothing else, it might jog her memory. Not to mention, by tomorrow she would likely have Spike back to help her.

Horn glowing, she grabbed a bundle of sleep clothes from the mini dresser by her bed. She paused for a moment as she stood there with them held under her arm, suddenly feeling as if she'd forgotten something before eventually shaking off the odd feeling.

Then, while still standing in the middle of her bedroom, Twilight began to undress, first pulling off her purple t-shirt and white bra, followed by both her jeans and panties. She couldn't help but feel a bit flustered, though she didn't feel like she had any real reason to be. It wasn't like anyone was watching her.

Despite not really knowing why she hastily put on her pajamas. The neatly bundled set she'd chosen consisted of a silky purple long sleeve shirt and a matching pair of pajama pants, both of which seemed to hug her a little tighter than they used to. Her nipples, slightly hardened from the cool air of her bedroom, were visibly poking up through the fabric, and her pants were digging deep in between her butt cheeks.

'Hmm... I must've grabbed one of my older sets...' She mumbled curiously, shrugging it off as she promptly threw herself into bed. Her old clothes lay discarded in the middle of the floor as she floated over one of her favorite books to read.

About an hour had passed, and Twilight was still awake, reading through one of her favorite mystery novels. She hummed contently as she flipped to the next page, wrapped up snugly in the comfy layers of her bed.

*Grrrooaan*

Her stomach suddenly made a low groaning noise, causing Twilight to shift uncomfortably. A heavy mass had just entered into her colon, and she could feel it begin to prod tentatively at the inside of her anus. With a grimace, she rolled her eyes before placing her book down on the bedside table next to her, a red bookmark sticking out where she'd left off.

"Ugh, right when I was finally getting to the good part too..." She grumbled, tossing off the layers of blankets and sheets enveloping her and getting up out of bed.

Now that she was standing up, the pressure against her rear was a little more noticeable. It was going to be a pretty big one. Stretching and yawning, she sighed, having just started to feel a bit sluggish and tired when this urge arose. But after that... she just stood there. She wore a bored expression as she stared straight ahead.

Only that expression slowly started to change as she remained firmly planted there, becoming increasingly confused before finally transitioning to complete and utter bewilderment.

"What... what do I do now?" She thought aloud.

It felt like a stupid question, but nonetheless, she found herself honesty asking it. She could still feel the pressing need to relieve her bowels, yet for some strange reason, she couldn't recall what she was even supposed to do about it. She knew that she'd forgotten something, that much felt obvious... but what? Yet the more she thought about it, the more worried she grew. Something was very wrong.

But then a thought occurred to her. Could the spell be responsible for this? It was certainly possible, after all, it had already led her to forget at least twenty minutes. It was only logical to assume that it could have been capable of far more than that. But if so, what else might have been erased from her mind that she wasn't even aware of yet?!

Another pang of urgency from her bowels quickly thrust her back to the present as she strained to keep her anus clenched to prevent anything from taking her panic as an opportunity to escape. Thankfully, the surge of pressure subsided a few moments later, though she felt no less desperate for relief than before. She needed to do something about this conundrum and soon.

But what was she to do?! Her need to go was only going to get worse with every passing minute, and she still had absolutely no idea what she was even meant to do about it! The fact that it felt like such a simple matter too only made her more confident that it had to be related to her failed spell. Though even without her memories, It wasn't hard to deduce what would inevitably happen should she not work this out in time.

*Pwwffpt!*

A small airy fart managed to squeeze through her defenses, blowing a tiny gust of hot and smelly gas into the seat of her cotton pajamas. Catching a whiff as it drifted upwards, Twilight's nose cringed, and she recoiled from the pungent odor.

"Come on Twilight! Think!" She told herself, racking her brain for even a hint of what to do. But then, as she was brainstorming, a new theory began to manifest.

Was it possible that the failed spell could have also changed her mind in other ways as well? What if it was merely making her think that there was something wrong?! She'd hear about spells that did things similar before, but could that really be the case? Yet the more she thought about it, the more the theory started to gain more traction.

'Of course! The spell did go wrong after all.' She thought, growing more confident by the second. She felt like she was finally making some progress!

But with that knowledge, what exactly was she supposed to do about the waste currently knocking at her back door? One of her passing thoughts from earlier was suddenly brought back to the forefront of her mind. If she didn't do anything, she'd eventually end up... pooping in her pants.

Just from thinking about it, Twilight began to make connections. It was something she knew ponies did from time to time, though she couldn't quite recall ever seeing anypony actually do it. But that would make perfect sense, right? Relieving oneself was meant to be a purely private matter, so it'd make logical sense that she'd never actually seen anypony pooping themselves.

Yet there was something about the concept that seemed off. Almost as if doing so would mean going against some fundamental part of her upbringing. It was certainly an odd feeling, and one that almost made her reconsider her big theory, but then she had another realization.

'What if that's just the spell talking?!'

She was sure of it now. That had to be it! This spell didn't want her to figure out the solution, so it was throwing strange feelings at her to confuse her! That was why the idea of pooping her pants felt so strange!

*Pwwwwffrrpt!*

As if in reply, a much longer fart ripped from between her cheeks as she made her breakthrough, reminding yet again of how desperate she was started to get. Yet despite her newfound certainty, it took her a moment to decide how exactly she planned on going this. Should she just... relax and let it happen?

Fighting her hesitation, she spread her feet a little further apart and relaxed her tense abdominal muscles. Her bowels seemed to realize they were being given a chance, and almost instantly, she felt her anus start to widen. With a gasp, Twilight found herself instinctively re-clenching as the log had just begun to slide out of her, incidentally pinching off a tiny chunk of it in the process. She could feel the warm little nugget nestled between her cheeks just outsider her quivering hole.

'Okay, come on Twilight, you can do this! Don't let that spell try to tell you otherwise!' She thought, determined to resist what she was certain was the spell trying to fight back. She had to win this!

Again she relaxed, and once again she felt her anus widen. It felt almost surreal as the beginning of a slender log slowly slid out of her. It pushed along as it made its way between her cheeks, towards the tight fabric hugging Twilight's ass. Twilight's pajama pants tented outwards as the solid log emerged, making room for itself as it started to coil.

Gravity pulled the bumpy protrusion down, resulting in a very prominent and visible bulge that jutted out from the seat of her pants. Eventually, the log ended, tapering off as her smeared anus closed behind it. Curious, Twilight let her right hand drift back behind her as she cautiously felt around, eventually discovering a roughly apple-sized bulge in the smooth cotton covering her butt.

With a relieved sigh, Twilight felt her pride swell. She'd done it! She'd pooped her pants!

Overjoyed to have finally conquered the spell once and for all, she confidently strutted back towards her bed, humming happily as she felt the bulge jiggle with each step. Not even the smell of shit could douse the feeling of power that she felt right now.

Tossing up the covers of her bed with a flick of her magic, she again threw herself in. A powerful shiver rolled over her as she felt the ball of poop in her pants squish and spread under her weight, causing her to squirm at the odd sensation. Grabbing her book with a renewed confidence in herself, she turned to the page she'd stopped. She smiled, excited to tell Spike all about her success when he got back home tomorrow morning...

Spike yawned as he pushed open the door to the upstairs of the Library, eyes half-lidded from exhaustion. Early morning sunlight was streaming through the windows as he lumbered through the doorway. The CMC had kept him up all night helping them with their latest scheme, endeavoring to earn 'magic scroll making cutie marks', as they called them.

Safe to say, it didn't end well and no one got their cutie mark. He had no idea where they got the materials to make the things, but he was pretty impressed that they had actually managed to make one, though all it did was make a purple flash when it was activated... Spike still wasn't sure what that was about...

"Hey Twi, I'm home." The teenage dragon called out lazily, making a b-line for his own bed which stood just behind Twilight's bed.

"Oh! Hello Spike, I can't wait to tell you what happened last night!" He heard her chirp happily from the far side of the room, just out of view.

"Yea, maybe later Twilight, I'm too tired for that right... now..." He started to say, only to trail off and stop just short of his bed as he found himself staring at Twilight who was bending over to look at a few book spines. A massive bumpy mound stuck out from her rear.

"Twilight... d-did... did you shit yourself?" He asked incredulously, not seeing any other explanation for the giant brown stains and smears that covered most of the mare's butt and the inner thighs of her pajama pants.

"Yep!" She called back, speaking as if that were something that everypony just did in their free time for laughs.

"...Right."

"So how'd it go with the CMC?" She asked, a bit distracted as she seemed to finally find the book she was looking for.

"It went... you know what? I'm just gonna go to sleep and assume this is just a really weird dream my tired brain is making up." Spike sighed, turning and promptly passing out face-first into bed. He was way too tired right now to deal with Twilight's literal shit right now...

Though he probably should have paid a bit more attention to which bed he had actually been standing in front of before faceplanting into the middle of it...

Author's Note

He's gonna smell that when he wakes up... Also, fun fact, this was originally a concept for something in a later chapter of A Soiled Universe, but I felt it worked better as it's own thing.