Commissioned by me
Artwork by shirasiyuki
Story written by  xylenqs

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There was no way all this wiggling was going to get her anywhere except deeper. Fay sighed, looking in front of her. Surely it couldn’t be that far to just wade across this stuff, right? She squinted, trying to figure out how far she needed to make it, but it was too difficult to tell where the mud ended and dry land began. Even the patches of grass seemed to be sitting on top of the muck, useless as lifelines.
Nostrils flaring in annoyance, Fay gave a soft shrug of her shoulders.
“Guess there’s no turning back.”
That possibility was long gone. Her legs were in the creamy goop way too deep to be able to rotate, and even if she could, it would mean her precious shorts would be ruined. Plowing through here wasn’t exactly her first choice, but it was her best bet to keep as much of her clothing as pristine as possible.
“Ugh... fine.”

Taking in a breath to steel herself, Fay pushed one leg forward and through the muck, shuddering as it rubbed and squelched against the appendage. The whole thing was disgusting, but it was effective.
Sccclllrrrppp.
“Nnfff...!”
Fay winced. Why did this have to happen to her? All she wanted was to go to a costume party and flirt a little. Now the only thing trying to get handsy was this awful pond full of swamp muck! One after the other, her legs continued to tread forward, their owner trying to ignore the awful sounds of mud being pushed to the side. There was no hope for her socks now—they were as good as ruined... but there was still a chance for her to salvage the rest of her clothing, and the rest of this party.
“Ggnnh... haaah... keep going, Fay...” She told herself.
The feeling was still awful, but despite being able to trudge ahead, it was still starting to wear her out. All of the hiking before now combined with the resistance of the muck took its toll on the canine, but she wasn’t about to stop and mill about in some mud pit! Fay continued wading through the pillowy muck, but despite ignoring those thick, creamy sounds... she couldn’t ignore the fact that she was starting to sink again.
“No... I can make it!” The canine huffed.
No matter what happened, it wouldn’t mess up her shorts. She refused to let it happen.

Sphlorph!
“Haa... N-NO!”
Despite her refusal, there was a deeper patch of muck that said otherwise. Fay looked down and let out a soft wail.
“M-My shorts...”
Not just her shorts, either. It only felt like she’d plunged down a few inches, but it was enough to slurp down the rest of her thighs. Mud was now pressing at the fabric covering her backside, greedily lapping at the fabric as Fay looked down at herself in shock. She didn’t want to look behind her, but something made her head turn. A long line of the broken surface, now a dark, pillowy mess, filled her gaze as she looked at how far she’d waded.

Oh wow... I’ve been walking this far through mud... She thought. Maybe I can make it before it takes all of my shorts...

But only if she could pick up the pace... and her stamina was going to wear out eventually. There was still a long way to go. With that awful muck pressing against her backside, the canine could feel her rump rising up, making her wince. A curious expression crossed her face a few moments later.
“...just how solid is the surface of this goop, anyway...?” Fay asked herself.
With any luck, maybe she’d stop sinking. Surely her body was buoyant enough that she wouldn’t actually have her shorts totally ruined. Yeah, all it would take was a small bit of research, no big deal! Deciding to run the risk, Fay gave her rear one soft bounce against the surface of the mud. Carefully, her eyes scanned the result: backside still in place, and several ripples across the surface, like small waves.
She hadn’t sunk any deeper, but based on the ripples, there was a long way to go. Fay tried again, now bouncing a few times. The result was the same, making the surface of the pit quiver and wobble from her location all the way to the... end.
“Ok...” Now she knew exactly how far she’d have to go... and with any luck, she’d be out of here in a few minutes!