Commissioned by me
Artwork by shirasiyuki
Ellie the Garchomp belongs to me
Story written by  XylenQS

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Think, Ellie, think… okay, maybe if I can find out exactly how deep this muck is… as long as it’s not bottomless…

Her body was still bouncing up and down, but even her full backside couldn’t help but slowly press against the surface with each grunt and gasp. Slowly, steadily, Ellie’s rump sank under, resurfacing only enough to show the new coat of mud on it before it pressed back down with a new pump of her haunches. The Garchomp accepted the fate of both it and her white bikini bottom; they were going under, and she couldn’t stop them from sinking into the thick abyss.
What she could do, however, was use all the thrusting to her advantage. If she kept stirring up this thick mess, surely it would loosen up! Then, maybe, she could start to actually pull herself out with her hands!

“Yeah… I can do this.” She told herself.
Sending her hips up and down wouldn’t be enough, she knew. Instead, she continued the same motions for a few moments, then changed to shimmying her hips—and now, her stomach a bit as well—from side to side. The wiggle in her body did make her haunches feel as if they weren’t held quite as tightly. Unsure if she should continue with her new idea or go back to her old one, the Garchomp instead settled on going between the two. Her body bounced for several seconds, making the surface wobble and bounce with her—and then Ellie’s hips gently swished and shimmied from side to side, stirring up the muck with her hips as best as she could.
All the while, she silently begged for her plan to work, feeling more and more of her tail slip beneath the mud’s surface. Despite all the internal pleading, all the work of her hips and body, and even the motions she had to make to keep herself from sinking deeper… none of it was working. Sure, she’d managed to get her hands back out of the muck, but Ellie couldn’t feel a bottom to the mud. What she could feel, however, was that sinking sensation.

“Ohhh…!” Ellie gave a soft wail, her arms coming up, hands slightly balled into fists as they pressed against her chest, “...I’m still sinking!”
Vision back on the mud pulling her hips under, Ellie couldn’t help but feel embarrassed, worried, and, deep down, like she was above sinking into a pit full of thick mud… but she wasn’t above it. This slow, gentle pull on her body had sucked her legs under, then her hips… and the Garchomp knew it was only going to keep taking her deeper. With one more gentle shimmy of her hips, only serving to make the surface slosh ever so slightly, Ellie gulped.

“O-Oh no…” She’d hoped it wasn’t, but she had to face the facts, “...this really is quicksand after all…”

The first step was admitting the stuff for what it was, and knowing exactly how the muck was acting… it had to be quicksand. The second step—
Sphlrph!
“A-AAH…!”
—was a sudden tug on her body. It was as if the quicksand recognized her acceptance, and in exchange, her hips not only sank under the surface, they were plunged all the way down to her navel. When the shock finally subsided, Ellie gave one final noise, somewhere between a squeak and a gasp.

“Oh, that’s just great… now I’m sinking even deeper!”
Her arms instinctively stayed up, lifted to the height of her chest. It wasn’t looking even good… and it was feeling even worse! Ellie gasped, looking behind her to see the last of her tail tip disappear with a small blorph.
“I’ve got to find a way out… and soon…”
If she did manage to get out of the quicksand, it’d take another dip in the lake to get all of this thick, hungry muck off of her now.