“Best of luck to you in there. Try not to wear yourself out before the beast has a little fun with you, okay?”

Those words came with a teasing air, but from behind the cover of thick, impenetrable glass, the scientist had nothing to fear of the squirming beast.

He had that much less to fear from Raiden, who’d been tossed into the water with an unceremonious splash.

“The beast? What the hell are they talking about?”

The room seemed empty enough, save for the water that sloshed between the contained walls of steel. Such thick and powerful security would have been cause enough for concern- that sort of protection shouldn’t have been necessary for a pool- but the jackal was keenly aware that he’d been hand-picked for something more than a dip in the shallow end.

Clothes weren’t necessary for an indoor swim, and those scientists watching from the observation window above didn’t want anything obstructing their view: they were paying very close attention to every possible detail.

Even down to the matting of Raiden’s black overcoat as the water sunk in and soaked his body was being taken into account, but those details would eventually take a backseat...once the beast decided that it was ready to explore its new prey.

One touch against the side of the jackal’s slender calf was enough to leave him shuddering, but it wasn’t the chill of the water that kept him trembling.

It was the girth of whatever had brushed against him...and the continued pressure of that flesh as it coiled around his thigh.

He tried his best not to stiffen up at that contact, but the slimy texture of something moving along his body forced him upright. Raiden tried his best to collect himself and pull his leg away, but already, the coils of a long, green tendril were making their way up and around, covering up the bands of vibrant yellow that patterned the middle of his thighs.

With three other limbs free to move, Raiden thought he might still have a fighting chance to escape the pool unscathed, but his gaze was pulled straight ahead by the rising presence of a thick, viridian tentacle, moving out of the water so slowly that it came across as arrogant.

The creature already knew that it was going to get the better of Raiden; to treat the experiment like a hunt would have been a waste of effort, and a disservice to the fun they were about to have.

“What...w-what the hell kind of experiment was this, again?”

Raiden was sure that the scientists could hear his question. He didn’t think it would have made any sense for them to take such detailed notes on the experiment if they weren’t collecting audio cues, and yet, they certainly didn’t act as though they could hear his cries.

His voice was already shaken by the presence of the first tendril, and the second was so long, so thick that it commanded respect by its size alone, but the once empty pool was filling with the coming tendrils of the beast- far more remained to be seen- but Raiden never saw the lengths of green that erupted through the surface of the water from behind.

They wrapped around his wrists in an instant and brought his arms together behind him, forcing the jackal into a defeated posture with little more than a groan from his muzzle.

It would be one of the last sounds he was able to make without something stuffing his throat.

“They, uh...t-they didn’t warn me about you,” Raiden admitted. He felt silly trying to make conversation with something that didn’t appear to have a mouth, and as he stared down the end of an impending tentacle, he couldn’t find eyes to gaze into, but he could almost feel the intention behind that limb, coming closer and closer to his lips.

That nervous, quivering muzzle knew it wouldn’t be able to stay shut, but Raiden tried his best to keep his jaws together all the same; it seemed the best use of what effort he’d be able to manage.

Struggling against the binds that held his wrists yielded nothing, save for an arid throat and raspy, nervous breaths. The tip of his tail was pulled into the same bundle of fluff as another tendril lifted the base of the same, and before he could finish his protest, a smaller, narrower tentacle prodded against his asshole, offering a slick, soothing tickle to that naked flesh.

“Hey! What the hell kind of experiment is th...thif...mnf? Mrnnf!”

The jackal never considered what a mistake it was to protest when his muzzle was such a point of interest for the bundle of tentacles, but leaving it open for even a moment was too long, on Raiden’s part.

Green, wiggling flesh pounded against that opening, flattening his tongue to the bottom of his maw and leaving him to gasp for air as thick, writhing flesh of green pushed further and further into the depths of his throat.

That penetration would have been a problem enough, if not for the strange, oozing fluid at the end of the tentacle.

What in the world is that stuff? Coating my throat, almost like syrup...and there’s so much of it!

As though he were chugging beer straight from the tap of a keg, Raiden found he couldn’t do enough to keep up with that flood. Reflexive swallowing was just enough to keep the mess from pouring back over the edges of his jowls, but the poor jackal could already feel the volume filling his gullet and sloshing around in the cavity of his tummy...

...and that was before a similar substance began seeping into his tailhole, allowing the rear tendril to penetrate that orifice with delightful ease.

“Testing subject ‘Raiden’ for pliability,” the voice over the loudspeaker made it clear that it was aware of the jackal’s predicament all the while, but his comfort and safety were far from their priority.

iOScythe was kind enough to do this YCH with my lad and it came out so good I commissioned a story from Joshiah for it! :D