Wallflower paused to take a deep breath, tilting her head up and closing her eyes as she tried to calm her shaky nerves. Both of the girl’s hands were clamped down on the shoulder straps of her backpack. She was preparing herself both mentally and physically for the task ahead.

This was really it. She was finally going to do it...

With an audible gulp, Wallflower reached out towards the door in front of her, hesitantly wrapping her trembling fingers around its cold metal knob. Gradually turning it until she heard a muffled click, Wallflower took in one last deep breath before leaning forward and pushing the classroom door wide open.

Striding as confidently as possible into her first-period class, she happened to be entering just as another student was in the midst of giving a presentation to the rest of the packed room. Standing up in front of the chalkboard, the young man didn't so much as stutter as she appeared.

In fact, not a single soul among all the students lazily watching his presentation so much as turned to see who had just shown up late. Even those sitting at the back, who would normally pounce on any opportunity to be distracted, didn't grant her even a passing glance.

A tingle ran down Wallflower's spine as she made her way slowly towards the middle-most aisle between the desks. She made an effort to walk right in front of the presenting student, and for the briefest of moments, she had directly crossed the sightlines of at least half the class. Her whole body shuddered as a tingle of arousal roared to life from her crotch.

Yet, the moment she was out of the way, not a single pair of eyes followed. She then made her way to her assigned desk in the center of the room. Not one person seemed in the least bit interested in the almost completely naked girl who had just casually walked across the classroom. Even their teacher, the infamous Mr. Doodle, had not yet called out Wallflower's egregious violation of the Canterlot High’s dress code.

Wearing nothing more than a rather skimpy pair of partially transparent black lace panties, she was leaving very little to the imagination. Her small yet perky breasts bounced lightly as Wallflower approached her desk, doing her best to control her breathing as she felt her exposed nipples stiffen.

Taking off her backpack and leaning it up against one of her desk's metal legs, she finally lowered her bare buttocks down onto the seat. The hard plastic felt cold, sending a chill racing up the naked girl’s spine that only sparked even goosebumps. It was only then that the gravity of what she was doing really hit her.

Another jolt of pleasure sparked between her thighs as a gitty excitement slowly rose within her. Part one of the plan had gone exactly as she hoped. Leaning over and reaching down into her backpack, Wallflower fished out the source of her apparent invisibility.

It was a round mossy stone, one engraved with strange mystic runes and currently emitting an ethereal green aura. She stared down at it for a moment, biting her bottom lip as she prayed that its effects wouldn't suddenly give out once she’d enacted the second and by far riskiest phase of her plan.

"Yes, yes, very good, now get back to your seat." Mr. Doodle's monotone voice droned as the student upfront finally finished giving his presentation.

"Alright, now who's going next, hm?" Mr. Doodle inquired as the boy walked back to his desk. "Are there any volunteers, or do I have to pick another victim?" He grumbled, eyes scanning the room for any raised hands.

Slowly, Wallflower forced her arm up into the air, face already burning as she now actively tried to draw attention to herself. Even then, it was at least a solid minute before he finally noticed her outstretched hand sticking up over the other student's heads.

"Hm? Oh, yes uhhh, Wallflower, was it?" He called out, barely even looking at her before glancing down at the seating chart on his desk. "Did you want to give your presentation now, or did you just need a 'drink of water' from the fountain down the hall?" He asked with an irritated sigh, clearly anticipating the latter answer.

"Y-yes, Mr. Doodle, I'm ready to p-present!" Wallflower chirped in reply, standing up quickly from her desk with the magic stone still clutched tightly in her hands.

Rolling his eyes, Mr. Doodle waved her up before sitting back down at his desk. Slowly walking up the aisle towards the front of the classroom, Wallflower could feel a few scattered eyes finally settling on her as various students picked up on her existence. Yet, just as with Mr. Doodle, not one of them reacted to her nudity.

She felt her stomach roll from a combination of intense anxiety and the rapidly intensifying arousal that moistened the gusset of her panties. Eventually reaching the front of the room, Wallflower closed her eyes and firmly squeezed the magic rock.

Instantly a green glowing wave of energy spread over the classroom, ensuring that the stone’s effects would last. Putting the rock down on the floor against the wall, she turned around to face the rest of her classmates. Her whole body froze as now about half of the class seemed to be staring right at her. Though she knew what the rock was capable of, the feeling of embarrassment and shame that pounded in her chest only intensified more with each moment.

"Um, h-hello everyone. M-my name is Wallflower Blush..." She stammered, blushing profusely as she struggled to finish her rehearsed introduction. “I-im sure that m-many of you are wondering w-why I am only wearing my p-panties to class today...”

“T-this is because my p-presentation is, um, is uh, about my... favorite f-fetish...” Wallflower continued, fumbling over her words as she forced them through her lips. “I... I like t-to....”

It was now that she realized the gravity of what she was about to do. She was about to reveal one of her deepest and dirtiest secrets. To an entire classroom full of people no less and many of whom she saw on a regular basis. They were all about to discover just how filthy and perverted she really was.

Her heart was pounding like a drum in her ears, Wallflower finally worked up the nerve to finish the not-so-subtle thesis and title of her 'presentation'.

"I like to shit myself!" Wallflower finally shouted, the words echoing over her audience as she instantly wished she could take back air used to create them.

Yet, even as she braced for the cacophony of laughter and disgust that would surely erupt from her classmates after such an announcement, it never came. Not a single person in the room seemed even the least bit surprised to hear her bizarre confession.

Desperate to fill the silence that followed before her heart could quite literally beat its way out of her chest, Wallflower cleared her dry throat and continued.

"S-so, uh, f-first, I will be d-demonstrating what I mean." She explained, palms cold and sweaty as she slowly turned around to face the chalkboard.

Face burning with the passion of a thousand suns, Wallflower took a moment to breather and widen her stance before finally bending over. Braced up against the chalkboard, she stuck her ass out towards the class. The tight fabric of her panties stretched to bridge the gap between her supple cheeks, just transparent enough to expose the sensitive hole normally tucked away between them. A dark wet line had also formed over the girl's virgin flower as sticky secretions bled through her underwear.

With labored breaths, Wallflower closed her eyes and mentally prepared herself for what she was about to do. Never once had she ever attempted to do something this crazy with the magic stone. The thought of it suddenly failing never left her mind. She doubted that she would ever truly recover from something like that happening. The risk was incredibly high, yet that only made her pussy throb even harder.

Adamant to get things moving before anything could go wrong, Wallflower refocused her attention on the one other thing that had been dominating her subconscious since this morning. There was an immense pressure looming within her bowels. She'd been holding it at bay for almost two full days, and now, all that built-up waste was ready to come out.

More than eager to oblige, Wallflower tentatively began relaxing her abdominal muscles little by little. Taking one last shuddering breath, a naughty grin started to spread across the girl’s face. One of her biggest fantasies was finally about to come true. She was really about to shit herself in front of the entire class.

Looking back over her shoulder, she gradually loosened the hold around her quivering anus.

*Pffffsst~*

Wallflower gasped as a short but powerful fart suddenly ripped through her anus, filling the interior of her panties with a burst of pungent fumes. This outburst was followed by another equally powerful fart shortly afterward, then another, and then another. Each one was increasingly more bassy and rotten smelling than the last as the buildup of gas in her system escaped. Before long, the entire room had become utterly saturated with the foul stench.

With the gas pocket out of the way, Wallflower felt her bowels shift. The dense and heavy mass impatiently waiting in her colon had finally started to move. Her anus bulged outward as a thick log pushed through her rectum, causing her cheeks to slightly part as her asshole expanded. At first, her anus struggled to accommodate the broad and bumpy head of the impending load, needing a bit more encouragement to make the final plunge down into her panties.

Wallflower grunted, pushing hard and wincing as the log finally emerged. Accompanied with wet crackling, the thick front of the turd slid out between her butt cheeks, smearing them with shit. Coming out more quickly now that the thickest section had been freed, the log quickly crashed into the seat of her unsuspecting underwear.

Pulling the already tight fabric away, a tall bulge formed. At its still-growing peak, the thick column supporting it had begun to make its mark on the delicate material. Wet and slimy residue seeped through the lacy panties, permanently staining them a muddy shade of brown.

*Hffft~*

A few particularly large pockets of gas sputtered out around the gradually tapering log, signaling it’s weakening as it struggled to extend the tall bulge any further. There was a wet snap as the more slender midsection finally broke, collapsing downward. Wallflower gasped as she felt her panties growing heavier and heavier with each passing second, sagging down beneath her messy ass cheeks and nestling up against the back of her thighs.

The stretched leg holes of her underwear created a perfect window inside, exposing the densely packed layers of poop taking up every crack and crevice it can find. Wallflower moaned as, by now, it had even begun to seep over the top of panties and up through the gusset, spreading the messy filth all across her crotch.

It seemed like an age had passed by the time the rush of softer poop finally slowed. By now, Wallflower could hardly think straight. Her mind felt numb from the intense combination of pleasure and relief, and she could hardly believe what she had just done.

Panting breathlessly, she remained in the same bent over position for almost a full minute before she eventually turned her head around to gazed back at the class. It was almost as if she hadn't done anything at all. None of them had so much as changed expression, with the only indication that something had changed being one person in the front that was waving away the oddly strong odor away from his nose.

The smell of poop was intense and it dominated anything else in the room with ease. Shuddering as she stood back up, Wallflower moaned again as the mound of shit in her panties finally settled and the last of her load slithered through her anus. Reaching back, she pulled up the drooping backside of her underwear, stifling a sharp gasp as she felt the contents smush up against her.

“Oh my g-god, I actually just did that...” Wallflower sighed hysterically, pussy throbbing from the realization. “I just fucking shit myself in front of the class~ ”

It hardly seemed real. But it was, and that fact was driving her pussy absolutely crazy. She was already despereate to cum, having already come close to doing so while pushing out the monster now resting in her underwear. Glancing up at the clock on the wall, she bit her bottom lip. She didn’t have much time left.

“I-im done with my presentation, Mr Doodle!” She quickly asserted.

“Hm? Oh, yes sure, good work.” He grumbled absentmindedly, waving her back in the direction of her desk as he crossed her name off on a piece of paper.

“U-um, actually sir, I’d like to go to the bathroom. I-” She began, stopping as a naughty idea suddenly came to mind. “-I did make a really big smelly mess in my panties, after all~” She finished, turning to show off the huge bulge.

“Yea, ahuh, sure thing Wallflower... *Ahem*, Alright who’s next then...” He mumbled, scanning the class as Wallflower quickly gathered her magic rock off the floor and threw on her backpack.

There was a fresh change of clothes inside, so by the time she got back, no one would be any the wiser. Hopefully the janitor wouldn’t think much of the smelly new addition to the girl’s bathroom garbage can that she was on her way to deposit~.

The bulge hanging from her butt jiggled and wobbled as she made her way back towards the classroom door. Though she planned on having the rest of her fun in the girl’s bathroom, she was unable to resist letting one of her hands slip down into the messy front of her panties now. Muffling a moan as a few of her fingers dove between her folds, she bit her lip excitedly and left the room, still masturbating in her soiled panties as she wandered the school hallways in search of a bathroom.

As the door slammed shut behind her, a strange sensation washed over those in the room as the bag containing the magical rock vanished from the room. Not long after there were several shouts of disgust as the assault on the other student’s sinuses was suddenly noticed.

“Woah, the hell?! Did somebody just take a dump in their pants or something?” One of the students in the back exclaimed, pinching his nose...

Author's Note

This one isn’t my favorite I’ve done, but I hope you all enjoy nonetheless. Though I was surprised to discover not a single use of the memory stone in any other scat or watersports related stuff, at least as far as I’m aware.