Mina and Momo's Mess-Off

A good ol' fashioned pantypoop contest reward~

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“Err...I got your text Mina, here I am!”
A soft-spoken voice called out into the mostly empty classroom as Momo Yaoyorozu walked in, the setting sun beaming behind her beautifully on this school day afternoon…

Most students had left for the dorms by now, but Mina Ashido seemingly had other plans for her and Momo today.

Assuming it’d be a special study date considering the pink girl’s recent grades, Momo was more than eager to help out and brought several of her cram books to help!

But when she finally saw Mina, those books all dropped...as did her jaw.

“HRRRNNnnnnNNNGH…

Oh! Momo, hey!!!”

The strikingly odd-looking girl smiled the same cheery, bright smile as she waved over to the girl.

Quite nonchalantly, considering how she currently perched atop her own desk, squatting with her skirt raised up over her pantyclad butt and actively...straining!?

“MINA!!!
W-W-What in the world are you doing, that’s so...improper…”
Momo cried out in surprise, her face growing red before she covered her own eyes.
Mina simply giggled in response, hopping down off her desk and skipping over to the girl, taking those soft porcelain hands into her own.

“Don’t be so shy, Momo! You’re gonna be doing it too, afterall~”

“D-DOING WHAT!?”

“POOPING!!!
It’s a pantypoop contest, right here and right now between two besties!!!”

Momo’s face miraculously got even hotter as soon as the words left Mina’s smiling lips. The most unbelievable thing had just left the girl’s mouth!

“P-PANTYPOOP CONTEST!?” she repeated, only blushing more as she repeated it. Loudly at that…

“PANTYPOOP CONTEST!!! Look, I wore my stretchiest pair just for it!” Mina happily said, spinning around and bunching her skirt up over her butt again. Sure enough, those full-cuts looked quite durable...

“Mina...w-what the heck made you even come up with such an idea, let alone asking me to join you in it!

...this feels like some awful thing Mineta would suggest…”

“Noooo, no way! It’s totally fun, I promise! And I picked you cause...well, you seemed like you’d make the biggest competition! You do eat a lot, y’know~”

Momo’s face could only get so steaming hot as Mina continued to embarrass her! First mooning, then an absolutely ridiculous proposal, and now REMINDING HER OF HOW UNLADYLIKE HER PORTIONS ARE…

Momo was normally a soft and sweet gal, always reserved and yet ready to help her fellow classmate out with whatever, whenever!
But for once, the girl had to turn her nose up at the idea…

“Mina...I-I simply can no-WILL not participate in such activiti-”

“NNNNNNNNRRRRRRFFFF…

I-It’s COMING!!!”

And right in the middle of Momo’s decline, she heard it. Beyond the shuffling of Mina’s shoes, of her hefty grunts, she heard the nastiest, muddiest, FILTHIEST sound splatter from those plump pink cheeks of hers…

sssssSSSSPLLLLLRRRRRRRRLRPTCH!!!

Momo’s eyes nearly popped out of her skull as she looked down to the bent over girl before her, pushing out what seemed to be the juiciest pink turd right into her undies!

Sizzling acid dripped from the bulge as lump after lump formed in her seat. Coiling logs of soft, almost gum-like poo slopped and squished into her formerly white underwear to such degrees, the girl had to blink to make sure she wasn’t just seeing things.

But sure enough...Mina Ashido was dumping in her panties, BiG TIME! To such...wild degrees at that…

“MINA!!!
MINA!!! Y-You stop that right now, you’re making a mess on the floor!
Urgh...i-it stinks…”

The second handedly embarrassed Momo clasped her hands over her nose and mouth as she stepped back from the disaster zone, watching an unreal amount of poo fill out Mina’s seat and sag further down her thighs, soon reaching knee-length!

Momo couldn’t comprehend it, was this part of her quirk!? Was she...INTO things like this!?

So many thoughts raced through her mind, she hardly even realized what was happening in her own silken drawers until it was too late.

“M-Momo!!!
Atta girl, you’re doing it! Push, PUSH!!!”

“W-Wha-...what did you sa-ARGH!!!”

Perhaps it was the smell, or maybe just the sheer ridiculousness of the situation. But at that moment, Momo felt her gut cramp up to incredible degrees!

Wrapping her arms around her stomach, bent at the knees, brow breaking into a light sweat, she felt an immense pressure at her backside...and a single log forcing its way into her pretty panties.

PPPPPHHHHHRRRRrrrrrrbrRRRlpTrbRTCH!!!

No sooner than when she felt it did Momo’s ass explode with a cacophony of splurts and blorts to easily rival Mina’s acid-wet farts.

And despite getting a later start, the girl was actually gaining mass on the pink little lady at a surprising speed!

Soft and muddy, Momo’s poo flowed from her with such ease and grace it was almost like it was being graded on a ballet!
The way her panties swayed and swerved as they were thoroughly soiled was an artform in itself, one to be proud of!!!...if it weren’t so humiliating.
Momo herself was near tears as she now half-squatted in the classroom, letting her uncontrollable mess flood her panties to the point of touching ground in mere minutes.
Still going.

“Ha...ha...w-whoa, Momo...are you STILL going!?” Mina exclaimed breathlessly, having just about emptied herself entirely into her impromptu diaper of a pair of panties.
Grabbing them at the waistband and hoisting them up as far as she could, Mina quickly shuffled around to get a better look at the output Momo had going.

But upon first glance even, it was clear that this load was going to far outpace the piddly, drippy little pink pile Mina’d struggled so hard to get out…

“H-Holy crap, I think she migh-”

“GRRRRRAAAAAAAAARGH!!!”

A mighty, almost primal-like grunt came from Momo as she sent her ass into overdrive! Her logs came out twice as thick, three times as fast, and ten times ranker!

Her browning panties SLAMMED to the ground and proceeded to spread out like rising pizza dough!

Mina could hardly even react before the doughy doody undies caught her under its massive weight, completely dwarfing both her load and her body!

Desks were pushed back, books were enveloped, and Momo’s entire lower half was sinking into a mudbath of her own making!!!
It was only when her hair was just barely grazing the ceiling did her sudden panty-packing onslaught finally cease…

Ass numb, body a sweaty, trembling mess, and heart racing from such a Plus Ultra performance in her panties, Momo whimpered slightly as she looked at the impossible mess she currently sat upon like a throne.

But more importantly…

“M-Mina...MINA!?

Are you okay, you’re not hurt are you!?

Oh god, I’m so sorry! I-I didn’t mean to...it just started coming out, I would never...Mina…”

The girl, even embarrassed and pooped out beyond belief, worried the most for her fellow classmate right this moment.

And for a moment, worried if she’d accidentally crushed her underneath all the weight of her poo...but to her delighted surprise, she could just barely feel something wiggling from underneath the mountain of a mess!

“M-Mo...mo…”

“Ah! Mina, are you okay!? I’m sorry, really! I jus-”

“...heh.

I’ll...win...next time...nice load, girl~”

And with a weak grin and a thumbs up, Mina allowed herself to pass out underneath the warm, mushy bed of Momo’s dirtied, dumpy underwear, already dreaming of how she’d beat such a mess as Momo panicked about just how she’d get out of here and clean this up...