Commissioned by me
Artwork by shirasiyuki
Story written by  xylenqs

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While Fay continued to fight the pillowy goop, a sudden noise caught her attention.

Plrph.

That sound was a new one. It sounded like a pop, but she couldn’t be certain. It happened so fast. If she was right, it was the sound of a bubble bursting, but she hadn’t seen anything. Knowing she couldn’t continue to waste time looking for a stray bubble, especially when it seemed like it had happened underneath the surface of the hungry earth. Arms still pressed into the muck, Fay began gently bouncing her sunken frame, trying to loosen its grip on her.
To her surprise, it began to work, and rather easily, at that! Fay could actually feel her body starting to rise up... but despite the good news, she found it odd.
“I could have... nnh... sworn I felt... something... mmff, under me... what was that?”

Fay was about to get her answer. The sound, the feeling, it had been a bubble... and now a second one was starting to swell underneath her. It rose up her body, making her eyes shrink, practically frozen as her gaze was pulled to the surface of the muck. There was nothing she could do about it, and soon it was rising up her legs, pressing tight against her haunches. The canine gave a soft squeak when it reached her thighs, rubbing like a hand that could touch everywhere across her soaked hips.
Not only did the sensation feel... admittedly, rather interesting, it was far better than what happened seconds later.

BLORPH!

It was much clearer this time. A bit of muck splattered against the bottom of her chest, making Fay squeeze her eyes shut. When she realized it wasn’t going to splatter her face, she gave a soft sigh...
...but then, she began to sink. Quickly.
All of that work to free her stomach, her hips, it was gone in an instant. Her jaw dropped in shock. She looked down in confusion, gasping as she sank down to her ribcage.
“W-Wait, what?! I’m... sinking even deeper?!”
She was sinking deeper. Up to her chest, Fay’s eyes shrunk, shocked as her breasts started to push up from the pressure against the bottom of her clothing. They bounced slightly, as if trying to break free of their prison. If only she could escape her prison. No, she would escape this goopy, thick prison of muck... she had to.
Trying to ignore that sinking feeling pushing her boobs up even more, the canine gently wiggled one of her arms, loosening the muck before trying to lift it. The appendage wouldn’t budge. She tried the other. It was stuck, too. With her arms snug in the muck, Fay tried to wiggle her shoulders instead. They were getting close to the surface, but letting them slip under too wasn’t an option. While they didn’t submerge, it was clear there was no lifting them up any higher.
“Crap...” Fay huffed, looking around at her situation. “I’m boob-deep now.” With a wince, she tried to think of any other options. “This really isn’t looking good...”
Fay had tried plowing forward, crawling back, squirming, bouncing, wiggling... and all she’d gotten for her troubles was, as she said, being chest-deep in quicksand. Feeling no bottom beneath her–from what little she could move her toes–the canine realized she’d exhausted all of her possible options.

All except for one.
She had to yell for help.

“Hellooo? Is anyone out there?”
It wasn’t a great plan, far from it. The odds of anyone being out here were almost none... but it was all the canine could do.
“Please, help me!” She called out, voice getting louder. “I’m sinking!”