The Cistern: Part 1

Story by Russ on SoFurry

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#28 of Transformation Stories

A young mouse signs up for a rather fun and interesting experience at a very special club


Climbing out of the taxi Trevor checked his phone for the address then nodded to the driver with thanks and sent them a tip. He was in the right place but it certainly wasn't what he was expecting! From the outside it looked like a really swanky brick apartment building with glass framed penthouses that overlooked the marina.

The brown mouse had been expecting somewhere dingy or in a rough part of town but this was nice! Relaxing a bit he followed the instructions in the email he'd received, heading around the side of the building and down a set of steps to the basement. He had known this club was exclusive but it was certainly looking more up-market then he had expected! To get through the door he had to scan a QR code and then he was inside and his small pink nose picked up a variety of scents as he moved through the entry room.

To his left was a locker room with showers and changing cubicles, to his right an office of some kind and a counter that must usually serve as a concierge or cloakroom point. What drew his attention was the open archway at the end of the corridor that led out onto a balcony above a large open room.

The walls were brick, the floor was laminated wood with an oak bar at one end of the room and a dance floor with DJ stage at the other. The space inbetween was filled by a series of circular tables in private wooden booths. Each one had their own privacy screens and a good view of the large screens hanging from the ceiling.

"Not what you were expecting is it?" a voice asked from behind him and Trevor span around startled, his pink and blue tipped mohawk flopping forward over his eyes. Brushing back his hair the mouse smiled a little nervously up at the brown rat standing behind him.

"Not really, I was expecting someplace a bit more...."

"Grungy?" the rat said with a grin, their own hair spiked up in a thick brown mohawk, an orange collar with a black plate on the front snug around their neck, "The upper club is as respectable as one could hope for this sort of place," he held out a hand, "I am Orel and you must be Trevor, the lucky mouse who signed up for a week of fun."

The rat clasped the fellow rodent's hand with his and smiled, "Yeah, that's me... I have to admit I've never done something like this before."

Orel grinned, "But you're interested and still want to go ahead? Once we start, little mouse you'll have your safeword but unless you use it I mean to take charge."

Trevor blushed, the rat was tall, broad shouldered and wearing a pair of black jeans and a red overcoat with gold buttons that hung open showing off a pleasing amount of brown fur covering his chest and stomach. Taking a deep breath and steadying his nerves Trevor nodded, "Ye... yes I'm sure, I... really want to give this a go."

Orel nodded and started down the steps to the main floor, "Well then, let's head downstairs and slip into something more comfortable, the club opens soon and I'd like us to be ready for our advertised start time."

Trevor took one last look back toward the door then reached down to adjust his trousers, just the idea of what he had signed up too had him excited. He then hurried after the larger rat, excited to see just how this played out.

-0-

The part of the club Orel took them too definitely had more of the "dungeon" feeling that Trevor had been expecting. Tiled floors, a utilitarian but well stocked shower room and two lockers with a heavy metal door at either end. The mouse stowed all his gear like Orel told him and set a pin for the locker then took a long shower using the products provided. He was a bit nervous but the rat had been warm and friendly and vanished through the metal door, telling Trevor to join him when he was ready.

Drying his fur Trevor then took a comb to his crest, working it through the pink and blue colouring the tip before he checked his tail and slipped into the sleek leather loincloth that had been provided. The outfit covered his junk and rump but otherwise left him entirely bare. There were leather cuffs and anklets as well and the mouse put them on but was a bit sad there wasn't anything for his neck! Still maybe Orel would put a collar on him personally...

He was actually rather looking forward to seeing just what Orel had planned. He'd signed up for this, filled in his preferences and got a response through the app. Pulling open the large metal door Trevor poked his snout into the room beyond, whiskers twitching as the scent of fresh lime tickled his nose. It was a large, circular chamber, the walls were bare concrete, the floor was a metal mesh, though the metal itself was laminated with a rubber coating so it was not hard against his pink feet. Pipes over-head crisscrossed the room though the light was dim making it hard to see exactly which one went where. Several alcoves and small rooms led off on the opposite side of the room but there was no sign of Orel.

Padding further into the room Trevor jumped as a shadow moved in one of the alcoves. A huge hulking shape moved into view; it was a rat, about eight feet tall, semi-feral with large paws, their fur a dark mustard coloured with a lighter underbelly and a darker crest running between their ears and down their spine.

He was naked except for the tattered remnants of a red coat clinging to their shoulders. It was the same coat Orel had been wearing and an identical strip of polymer with the black square over the throat encircled their neck. Except the collar was currently a deep, rich maroon colour and the mustard coloured rat's eyes now match that red shade. Trevor's eyes slid down the rat's huge, hulking body, almost against his will and focussed on the plump sheath and large balls resting snugly against the floor.

"You... you changed," Trevor whispered as the rat moved closer, walking slowly but confidently on his hind legs. A long, pointed goatee of dark yellow hair hung from the end of their chin. It reached part way down his chest and matched the colour of his crest.

"I did," the rat rumbled, their voice deeper then Orel's had been, "I am the Sewer Rat and you little mouse have one final chance to back out," he held out a strip of black fabric, a simple collar, no buckle though, it looked designed to stretch and slip over his head as one single piece, "You can leave now or... accept my collar and become my toy for the next five days and nights."

Trevor licked his lips, hesitated then tilted his head forward, squeaking in submission as he offered his neck to the huge yellow furred rat. Orel, Sewer Rat chuckled and stretched that strange polymer over Trevor's ears and head and then let it snap closed over his throat.

"Good mouse," the rat rumbled, "The show will be starting soon."

"Show?" Trevor asked as he let the big rat shepherd him toward the centre of the room, "What show?"

Sewer Rat laughed and grabbed Trevor's arms, pulling them up above his head, clicking several clips into the rings attached to his cuffs into place, trapping him in the middle, chained in place.

Trevor gulped, the nerves were back but his loincloth was also tenting as his cock excitedly poked from its sheath. He squirmed, blushing beneath his fur, ears turning red as the rat chained his ankles to the mesh floor as well.

"You signed up for exhibitionism," the rat rumbled in his ears, his own cock was starting to show, poking out between his legs as he shackled Trevor in place, "The whole club will be watching us by now little mouse."

A sleek pink paw slipped across Trevor's cock, teasing up its length and a clawed thumb teased pre-cum across the top of his sensitive head. The mouse bit back a soft groan, squirming as his tail was pulled up and clipped to his collar, forcing it to lie along his back and his cock finished growing hard. Beyond that teasing stroke however his master for the week ignored it as he reached up into the pipes covering the ceiling and pulled something down.

"Now let's finish getting you dressed," he growled in excitement, thick goatee swaying against his chest as he spoke, "Then the show can begin."

Trevor's eyes widened as he saw the gag mask, it was sleek bronze coloured latex with an insert inside shaped somewhat like a cock. Sewer Rat presented it to his lips and shyly, nervously Trevor opened up and let it slide over his tongue. It fitted just right, the stiff rubber malleable enough to conform to the inside of his mouth, holding his tongue down as the big yellow rat pulled the outer covering into place. Plastic slid over his nose, allowing it to poke free so he could breath as straps were tied behind his head to hold it against his muzzle. It forced his mouth closed, the bronze rubber covering his face up to his neck and eyes.

A tube spiralled up out of the front of his mouth, vanishing into the gloom of the ceiling, there was no mistaking what it was for! Feeding him liquids he had no choice but to drink against his will! Squirming, blushing, humiliated, horny, excited Trevor whined quietly behind the rubber mask holding his muzzle shut and then went wide eyed as Sewer Rat climbed up onto a large block before him. The big rodent leant forward, resting his front paws on the mouse's shoulders and grinned as he rested his head between Trevor's ears.

"I get the first go," he whispered and with a soft, contented squeak let go. A jet of deep yellow urine shot out of the mustard furred rat's cock and started to soak Trevor's stomach. It flowed down around the base of his cock and soaked into the fur of his balls leaving him squirming and blushing in excitement as the intense scent of the big rat's piss filled his nose.

It seemed to go on for several minutes and Trevor was left squirming, warm, wet, rock hard and blushing heavily. As Sewer Rat finished he walked around behind Trevor, sliding up close to the mouse's trapped body, letting his warm bulk press against the smaller rodent. Arms wrapped around him, hugging him gently as that cock slipped up to press against his rump.

"You can see what everyone upstairs is seeing as well if you like," Sewer Rat murmured.

"What do you..." Trevor started to ask but with a squeak the rat rested his head between Trevor's ears again as a screen flickered on before them.

It was showing Trevor and Sewer Rat, the two rodents pressed together, Trevor chained up, a tilted angle, the camera was clearly somewhere up in the ceiling but the mouse could see it all. His eyes went wide as he realised that this must be being shown on all the screens up in the main club! He whined, a soft squeak that turned into a gasp as the big rat's cock started to slide into him.

He was being slow, gentle, tender in his advance and Trevor had a moment to get used to that tapered head being inside him before he was hit by a sudden torrent of piss! It poured out of the ceiling, hot and musky, spraying over them both from both directions, soaking their fur. Trevor moaned as the Sewer Rat continued to press his cock up into the mouses' rump but his eyes never left that screen!

He had no idea how they had this much piss in the pipes, it wasn't rank or stale, it was hot and musky, fresh and so very, very wet! As his rump was filled, as the big wet rat slid all the way home Trevor noticed his brown fur was changing colour! The piss was reacting to something in his fur, no doubt some chemical hidden in the shampoo, the brown and beige colour of his fur shifting to match the Sewer Rats dark yellows.

More importantly his body was changing too! He could feel his wrists and ankles thickening, his torso seeming to lengthen even as his waist dropped closer to the floor. The piss and whatever he'd been covered in was reacting, or maybe it was the collar, it was clinging to his throat tightly and tingling. Regardless of what was causing it Trevor squeaked, moaning as he heard his voice deepening! His restraints adjusted to accommodate his new size, his tail thickening, his mohawk kept its distinctive patterning but the colours were now bronze and gold.

Eyes wide in surprise Trevor watched in shock, body tingling, filled with a deep seated lusty need as he transformed for everyone to see! He was becoming a rat, something he'd been called many times but this time it was actually happening!

As the changes to his fur colour neared completion and his head finished growing thicker and longer the first salty tasting rush of liquid flowed through the pipe and into his muzzle! Trevor moaned, forced to swallow or let it spill out and down his muzzle and neck! At the same moment Sewer Rat pulled out of him and thrust home again! It was too hot, he was wet, soaked through, being force fed, collared and now even his identity being washed away as he became the bigger rat's pet live on tv! Trevor came, his cock twitched, jets of thick sticky mouse cream taken by the torrent of piss that was still pouring down over them! The changes to his body seemed to surge along the length of his cock as he came, extending his orgasm and making him shudder as he swallowed another muzzle full of piss.

His rump clenched tightly around his master's cock as he thrust home; the big rat's head tilted back, letting his mouth fill, enjoying a drink of his own as his large, huge body continued to hump Trevor at his leisure. His goatee was slick, plastered to his chest, his crest now flat and soaked like the rest of his pelt as he continued to hump the transforming mouse. He was clearly enjoying himself and the spectacle they were both making until with a happy, loud, rumbling squeak the golden rat in the red collar flooded Trevor's rump with his own seed.

He held himself inside the new rat for a good couple of minutes after his and Trev's orgasm ebbed. Then the screen faded to dark and the rat slid free as the drink flowing down Trevor's tube and the torrent of piss switched off. Fur dripping, body soaked, cock hanging low, retreating into its sheath Sewer Rat reached up to unclip Trevor's arms from their chains.

"Welcome to the cistern Toilet Rat," the big rat rumbled, his wet hands sliding gently over Trevor's soaked, piss yellow furry shoulders, "For the next five days we live here, eat in here, make love in here, we are Sewer Rats and that... that was just a taste of what's to come my little Toilet."

Trevor blushed, using his own hands to unbuckle the gag and muzzle as his Master released his ankle chains. Once his jaw was free Trevor took a deep breath, the air was full of the fresh scent of piss, they both reeked.

"I ... wasn't expecting this," he ran his hands down his larger, more feral rat like body, "It felt amazing..."

"Well we had to put on a good show," Sewer Rat smirked, "Only our VIP members get into the club tonight, to see you transform. Tomorrow the club will open to the general members but no one who sees our first public show will see the real you, this way your identity is protected."

"That's good," Trevor murmured, blushing heavily as he felt his cock twitch, he couldn't believe this! Looking down at his golden brown, pissed coloured rat body he couldn't help but feel aroused. It was going to be a fascinating experience and now... now no one watching would know it was him!

With his fur coloured in various shades of yellow he was... he was the Toilet Rat, pet, slave, lover of the great big Sewer Rat... this was going to be an amazing week!

~fin... for now