Commissioned by me
Artwork by shirasiyuki
Story written by  xylenqs

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Annoyed as she was, Fay knew all too well that the lower half of her attire would need to be washed. Still, salvaging the rest of her outfit was possible, and she was not about to let her shorts get ruined by this awful muck! She huffed and whined, legs pumping up and down as the canine attempted to get herself free.
Glrrrph, blkkk, phlaph...
The mire, however, had no intentions of letting Fay go. Her breath came heavier and faster, trying to use up more of her energy without dipping her paws against the surface.
“Come on... I’m strong enough to get out of this... nnggghh... w-with just my legs!” She groaned, looking down at her soaked, stained legs. “Knock it off, you stupid muck...!”
It was nowhere near done with her. It continued to pillow and spill around her thighs, soaking into every last inch of fabric and fur it could reach, staining both in a way that would never truly come out.
“Ohh, why me...?” Fay huffed, trying to quickly jump in a way that would lift herself up.

Luckily for her, it worked... for about half of a second. After that small bit of height, however, she could feel a soft bubble and then a deep squish directly onto the lower of her backside.
“H-Haangh...!”
The canine’s body shuddered. It already felt goopy on her legs, but on her admittedly rather thick backside? Now this stuff was really going to try and weigh her down.
“No! Not my shorts!” Fay’s gaze drifted down to the bog, glaring at it. “Ruin my socks, fine, but this outfit took a lot of time to... ghhh, p-put together!”
Like it or not, it’d take more than legwork to get out of this creamy muck. It was really starting to break apart now, and her legs weren’t much use when they were all but buried inside of this awful stuff. Fay sighed.
“...fine, guess I’ve got to.”
The very idea felt disgusting, almost sinful, but there was no choice if she was going to get out of this stuff with a mostly clean outfit. One side of her hips tried to lift themselves up, then the other, giving a soft shimmy back and forth. It didn’t make her legs rise any, but it did stop her from sinking.
“Nnhhh...”
Still...
“...this feels so wrong...”
Wincing, Fay grit her teeth, one eye squeezed shut as she continued to fight the creamy suction attempting to slurp her deeper into its embrace.
“Gaah, how deep is this stuff, anyway?!” She grunted. “I’m strong enough to get myself out of this... if I could just... find a... bottom!”

With each pause, the canine huffed, swishing her hips back and forth... but if anything was about to find a bottom, it was the muck reaching for Fay’s thick rump.