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He'd been left waiting for far too long. The sound of hooves approaching was greatly welcomed as the bull from before came back. Nikolai had left the mutt tied to a bench several hours ago, bound in the dark amidst the surroundings of a bizarre work space. It was by no means a comfortable wait - Martin had since developed a cramp half an hour or so since the bull had departed - but at least it was over now. At least he hoped it was over now. The look on the man's face told otherwise.

Nikolai stank. Martin's nose recoiled as the male came closer, advancing not towards the mutt's head but his rear instead. In the shoddy light, it became apparent that not only did the bull stink, but he was nude as well, fur sodden in what was unmistakably urine. Martin didn't even want to question where he'd been all this time, though his imagination had plenty to go on to conjure up some image of him being used by other men for their relief. Maybe Nikolai had returned because it was time to exact the same treatment on the mutt as had been done unto him. The leering grin on his face, eyes clouded with sadistic pleasure, was unnerving as his face gleamed through the dark. He fit the bill for a typical patron of any fetish club; jacked with muscle, built like a wall, with the stature of any giant. It was one of the reasons Martin had succumbed so easily to this warped suggestion of being hog-tied and brought to this... 'room'. What he hadn't expected was for the male to return piss-soaked and naked.

Approaching the mutt on the table, Nikolai reached down and fished for the thin tubing which hung from somewhere up above them both. It had been trailing down one side of the bench for some time, but Martin hadn't thought much of it. Aside from the rest of the room, it didn't seem out of place to them. He had assumed it was a wire, some trailing cable that had fallen from the rafters. Apparently he had thought wrong. The bull swiveled the end between his fingers, examining it closely. The side of his mouth peeled up into a smirk; he seemed to be satisfied enough with it, enough to slip it between his lips and suckle on it. Confused, Martin could do nothing but sit there and watch, a light pant making his chest rise and fall as he anticipated Nikolai's next move. He had honestly expected the man to just walk back in and prep his ass for the fucking of a lifetime, but no. Here they were staring each other down, he licking the end of a tube whilst Martin just gave feeble tugs at his restraints. No words were passed. Just the dulled quiet filled with clattering chains, heavy breaths, and the soft slurp of the bull's mouth.

Nikolai pulled the tube from between his lips, the end dripping with spit, and he reached forward with his free paw, grabbing Martin's hard cock. His erection hadn't waned in all the time he'd been left along, the situation giving him little reprieve from the tension. The anticipation and touch now fueled his need for something more, his hips wanting to do nothing but buck into the bull's grasp, but something told him to wait, to think twice before he tried to do anything. Maybe it was the peculiar tube Nikolai held or the expression of his gaze, but something was off.

He was right to worry. Watching, almost mortified, the bull hacked up a wad of saliva and spat it against the mutt's head. The sensation backfired with a shudder up his spine, Martin gasping at the scant feeling, cold drool now slipping down his shaft. Nikolai brought the end of the tube to his dick, fingers holding his shaft prying his head apart so that the opening to his urethra was forced wide open. Martin whimpered, barking some incoherent protest as panic seized his words, but he was in no position to stop Nikolai as he fed the tube into his cock. The mutt made a shrill squeal, the sound clogged in his chest, as the sharp feeling of something alien slithered down his shaft. He could feel the very tube worm its way into his urethra, forcing a narrow opening to become even wider than it was meant to, forced to take something foreign and invasive. For as much as he flailed in the bindings, it meant nothing to the bull. He held his member firm and steady, making sure to keep slipping in the tube until he hit something deep within the mutt, something that had never been touched before.

Gasping loudly, with a frightened yelp, Nikolai tapped the inner entrance deep inside Martin. He gave the mutt an innocent smile as he surged forward with the tube, breaching the innermost sanctum. It felt like he was going to piss himself, the sensation was so brilliant and instant that it left Martin dazed. He would have struggled even more but his body wouldn't comply. It was like the trauma had gave him shock, left him senseless and unresponsive. He could just lay back, eyes glazed and mouth wide open in both amazement and horror as Nikolai inflated the balloon at the end of the tube, sealing it inside the mutt's bladder. It was a catheter, that much was clear now. But if that was indeed what it was, it begged the rather terrifying question: where did the other end go then?

The bull still didn't say anything. He moved to the mutt's side, reaching up above with a stretch towards the ceiling. In the dark, his paw patted along what appear to be a tank or canister fixed to the roof. Martin hadn't seen it due to the poor light, but seeing Nikolai's paws disappear from view proved there was something there, some clear container just hidden in shadows. He peered closer, squinting as he tried to ignore the intense feeling radiating up from his abdomen. Something... dark. And off-colour. He'd even dare to say it was perhaps gold, or amber, or yellow.

The realisation hit him like a runaway train as Nikolai flicked some concealed switch. Pumps whirred into life and the mechanical clangs drowned out Martin's alarmed shouts, only to then be silenced by the bull stuffing his member into the mutt's open maw. He nearly choked, but obediently he began to suck on Nikolai's cock, letting the male thrust his hips forward to fuck the willing mouth whilst Martin kept his eyes trained on the tank. There was an ominous gurgle. Bubbles fluttered into the canister only to burst and dissipate as they reached the surface. It was then something very, very wrong began.

The initial jet took Martin by surprise; something hit deep within him, straight into his bladder. He could feel the intense cramp as what had to be somebody else's piss was pumped into his own body. It was so depraved and dirty, something so intrusive and evil that it would only have been cooked up by a filthy mind. It didn't stop either, as he carried on letting himself be skull-fucked by Nikolai, more piss flooded his bladder until it was beyond just full. That's when his gut started to bloat as he was forced to take more than was physically possible. The eerie warmth of stale urine was swelling and swirling inside his abdomen, and it continued to grow. Soon, Martin couldn't even see his own dick past his belly as it was pumped full of piss.

Nikolai's paw snaked down to the ballooning stomach and gave it an affectionate rub, shaking it a little from side to side so that the sound of liquid gargling filled the mutt's ears. He would have come at that point, the feeling so acute and unthinkable, but the pathway was blocked. The bull just smiled, as he had done since he'd entered, and let out a soft sigh. He let loose a stream of his own, pissing into Martin's throat until it backed up and spilled around his lips. Acrid urine filled his stomach from the other end, Martin gulping down as much as he could, before he had to let go, coughing as he breathed for sorely needed air. Nikolai's just continued to relieve himself, not caring for his slave's state, marking his head with rank smelling piss.

"When you're finished with this tank, I've got three more for you ready and waiting." Martin choked back and sob and whined, but he didn't dare say a word. "We'll see where we can fill you up next."