FSE

Furry search engine

formerly SoFurry search engine

An Eiji Otaka Creation

Elusive Friendly Yeenwolf Writer

Corrupted Transformation Architect

Rattenburg Bros.: Gym Rats Welcome

Your gym shoes won't be the only thing squeaking after a workout with Ricky.

Story

Having lived in the area all his life, Gary knew most of the local businesses. When he saw the brand new sign advertising the Rattenburg Bros Gym, he was immediately intrigued. He'd spend over a year mostly inside after the pandemic and it seemed like his body never recovered from the overly sedentary lifestyle. Seeing the commercial for the gym with some muscular gray-furred rat man with a blue pompadour was a bit silly, but from the commercial it was actually not too far from the apartment he shared with his two roommates, Sandy and Dex. He figured a new routine at the gym would be the best way to get back in shape and cut a few pounds. So that afternoon he decided to check it out.

"Hey guys, there's a new gym that opened up nearby. Wanna join me, and check it out?" asked Gary to Sandy and Dex as they sat on the couch absorbed into their Switches.

"I could use some time in the gym, but I'm not in the mood today. Maybe another day, Gary," said Sandy while taking a moment to brush a strand of her red hair out of her line of sight.

"Yeah, I'm pretty okay with my body as is for the moment. So I'll pass," said Dex, not even looking up from his game. His short dreads tied up in a topknot so he wouldn't have the same issue as Sandy. His eyes were laser trained through his glasses to the screen.

"Alright, suit yourselves. I'm going to start my journey to reclaiming my six-pack, haha!" said Gary as he left.

It was a relatively short walk, and as he walked in the door, he could instantly tell that there was something different about this gym. There was a lingering scent of musk that hung in the air, and he wasn't quite sure where it was coming from. As he looked around, he noticed that there were more than just regular weight machines and treadmills. The gym had an impressive selection of equipment, including battle ropes, suspension bands, and even a foam roller station. In the corner of the room, he spotted an old friend; the squat rack. However, one thing was missing; an actual person.

As Gary started to survey the equipment, trying to decide which one he should try first, he heard a voice behind him.

"Welcome to the Rattenburg Bros Gym. How can we help you today, bro?"

When Gary turned to see who was speaking to him, he didn't expect to come face-to-face with a humanoid rat. In fact, it wasn't until he registered that it was wearing a blue pompadour and bright red sneakers, that he realized it must be the mascot for the gym.

"Oh wow, sorry... uh.. hi. Yes, I was hoping to sign up for a membership," replied Gary nervously.

"We've got special deals for people who live in the area right now. But also a deal for first-time visitors too. So why don't you start with that then go from there?" said the rat, gesturing with his furry paws.

"Sure, thanks! Uh.. so what are you exactly? Like, that's a costume, right? It looks so real."

The rat chuckled.

"That's a fair question. Yeah, it's a high end costume I got for the gym. Kinda goes with the whole gym rat stereotype. It's perfect for standing out though right? It caught your attention," he replied.

"Uh. Yeah. I guess you're right," said Gary.

"I'm Ricky Rattenburg. The gym owner, manager, personal trainer, and as you can see mascot, haha." said Ricky with a smile. Gary was a bit unnerved at how realistic the costume was. The mouth moved perfectly with his words. The fur looked real and even a bit damp with sweat. He even had a tuft of blue pubic hair under his arms and on his gray-furred chest that strained against a white tank top with the gym's logo. Even his furry thighs bulged with muscle in the red shorts. And was that... Did the suit even have a bulge? Gross. Was this guy a furry?

"So uh... Do you wear the costume all the time? It has to get really hot in there."

"Not all the time but usually to keep the gym goers motivated during PT. I spent so much on this thing, I'm pretty determined to get my money's worth, heheh," said Ricky deceptively.

"Oh. That makes sense."

"Give me a minute, and I can change out of this and show you around as well as get you started," said Ricky trotting off back to his office.

He came back a few minutes later, looking like a tall muscular human wearing the same clothes and shook Gary's hand. Gary noted that Ricky had the same blue pompadour what he thought was the mascot outfit, even his chest hair seemed to have a bluish tint to it.

"Ah, there we go. That looks a bit more normal. C'mon, let's start the tour and signups.

Ricky led Gary on a tour and showed him around the various amenities. It was a standard gym but with some unique equipment and features. It felt like a more relaxed and friendly atmosphere than most of the gyms Gary had been to in the past despite the fact that the few people already working out in the gym seemed pretty ripped and heavy into their workout. The place still smelled a bit funny though. Musky.

They returned to the front desk area, and Gary signed up for a membership with Ricky. After handing Gary his lanyard, gym bag, and a Rattenburg Bros Gym shirt Ricky pointed to a stand that had bottles with the gym logo.

"Why don't you grab one of those before we start your tour with some stretches. They're our patented Sweatshakes. Protein, electrolytes, and all natural water. Members get one free every day. Also newcomers get a free hour of PT with me or our staff for the first 3 days. You have a preference for your stretches, bro?"

"Uh, nope. Not at all." said Gary as he grabbed a bottle and opened it up for a quick heavy swig. It tasted no better than any other protein shake, but he wasn't expecting it to taste like a nasty combination of salt, sweat, and savory musk. It made Gary want to gag. However, he knew better than to complain to the gym owner on the first day. Gary sighed and followed Ricky to the open space for their stretches.

Gary expected the owner to be a decent guy, but he did not expect him to be such a ball of energy. He talked and gestured at an impossible pace and had enough charisma to convince the Pope that working out was his destiny. While stretching together, he regaled Gary with stories of how he grew his business, which mainly consisted of showing off his chiseled body in places of his hometown that needed an influx of fitness people. He also bragged about having two brothers who were also business owners that he adored, but seemed to be the only ones immune to his infectious desire to workout.

Before he knew it, Gary found himself wrapped up in Ricky's story, and as soon as he realized Ricky was done with his own routine, he sprung up from his last stretch to copy him.

"You ready to hit some weights?" Ricky asked cheerfully.

"You know it, Ricky! Let's get pumped up!" Gary responded. He suddenly remembered what he liked about the gym scene in the first place, and a big part of that was finding someone he clicked with as a buddy to workout with. He suddenly couldn't wait to check out all the different types of exercise he could do.

"Let's start with some leg exercises since they're so often neglected. We'll take some pictures so that you can be reminded of what these muscles look like before you work out, so you know how to focus on them specifically, and get them stronger. Take a shot with me for your before pics too, haha. Keep that for your phone." he said, holding up his own.

Gary took a selfie with Ricky who was grinning ear to ear. Gary posed, flexing his flabby bicep.

"Yeah, it'll be much better once we get all of this worked out!"

After a round of squats, deadlifts, lunges, and even some single leg stuff, Gary was about to lose his mind from all the pain, but he could feel himself getting pumped. Ricky kept pumping him up with kind words about how much he'd improved since he arrived, and Gary believed them. He pushed through each exercise and set, eager to impress Ricky. The big man's close proximity had his musk almost cloaked around Gary and despite its potency, the odor just made him want to be closer to Ricky. To be more built like him. To befriend him. It pushed him to work harder, and unknown to Gary, caused him to gain a semi in his shorts.

Ricky continued with his positivity, but after a solid hour also insisted that they take a break.

"Your legs need time to recover between workouts, or you'll actually be doing more harm than good. Drink some more of that Sweatshake, you're really worked up a sweat, so you've more than earned it. Grab a second one if you like. It's on the house."

Gary smiled and took Ricky up on his offer. The taste was just as awful as before, but he tried to down it as fast as possible while Ricky looked away for a moment. When he looked back, he grinned and Gary handed him the empty bottle.

"Wow, you drink like a beast. I wish everyone that came here could appreciate all the hard work it takes to get those things. I gotta finish up some paperwork in my office, but maybe we can pick up again tomorrow, after you've rested up from the full-body workout, haha. Be sure to take another Sweatshake for the road!"

Ricky stepped aside for a moment to talk to a burly black guy with a beard before heading towards the back room. Gary watched him walk away. Despite how weird the whole interaction with the owner had been so far, Gary decided he definitely liked Ricky and looked forward to meeting with him again.

As he walked home, Gary realized he'd spent three hours at the gym with Ricky and the rest of it without him and somehow it hadn't sucked. His muscles ached and burned but at the same time felt amazing. He chugged his last Sweatshake and it almost felt like his vitality returned some. He just ignored the taste, but what he couldn't ignore was how his shorts were tenting a bit on the way home. He felt a bit embarrassed, but it was just the testosterone from a hard workout right? He could take care of that when he got back to the apartment.

When he entered, the TV was playing but Sandy was nowhere to be seen and Dex was napping on the couch. Gary peeled off his sweaty clothes and went into his bedroom. He wanted to pass out after his workout, but he really needed to get rid of that erection first.

Pulling out his laptop from the side drawer and plugging it into the wall, Gary began scrolling through porn websites in search of something that would give him enough of a release to allow him to fall asleep. As he scrolled, he came across a video titled "Buff Masc Musk Jock Fucks Woman in Showers". Something about it struck a chord with him, and he pressed play.

He didn't know what it was about the guy on the screen, but he was fucking shredded. His muscles were sculpted and defined to perfection, and his bulge was massive. His thighs were so thick they nearly burst out of his gym shorts. Gary's hand instinctively wandered down to his dick, and he started to slowly rub it as he watched the jock enter the shower.

As the woman with him approached, Gary felt his cock growing even more erect. Her breasts were enormous, and her body was perfectly curved. She was also ridiculously toned and muscular for a woman, and her ass was to die for. Gary couldn't believe he was so turned on by this, but he didn't stop touching himself. Instead, he reached over and grabbed his pillow to use as an additional support as he stroked his dick even faster.

He could feel his balls tightening as the woman got on her knees and began to suck the jock's cock. It was huge, and Gary wondered if it would fit in her mouth. He knew his wasn't as big as the guy in the video, but it certainly wouldn't be small enough for it either. He imagined his dick being as big as that and saw himself sucking and jerking it off with two girls pleasuring him. He started imagining Ricky joining in...

Gary moaned out loud and pumped his fist even quicker on his member, not caring if he woke anyone up.

"Oh yeah," he whispered to himself.

Gary started moaning louder and louder as he rubbed his dick harder and harder. His breathing quickened, and his body started to spasm.

"Oh god," he breathed.

Suddenly, Gary's body stiffened, and he felt his balls unloading into his hand. The volume was surprising, but the release was incredible. The tension in his body completely evaporated, and his breathing slowed to normal. He collapsed back onto his bed, and passed out before he could clean up the mess he'd made.

---

Back at the gym Ricky was looking as ratty as he did when Gary first showed up that day. He was in a back room at the gym standing over a bucket while jerking his dark gray uncut cock.

"Skree... Gotta get a fresh batch to mix in the Sweatshakes for my gym rats tomorrow," he huffed and squeaked before his fat 14 inch cock twitched and spewed quarts of thick yellow corruptive wererat cum into the bucket as his thick corded hairless tail lazily swung behind him.

Ricky giggled as his rod poured its remaining spurts into the bucket before tapping the tip on the rim. He gripped his slick rod and gave it a few strokes as he made sure to catch the drops and deposit them into the bucket.

"Yeah, I made plenty for myself so I don't need to make another batch for a while. Looks like I made enough to make like fifty shakes," he laughed as his fat twitching cumslit slowly closed and his sweaty foreskin slid back over the head. That new guy at the gym was going to be a great new addition. Maybe he could get him to bring some others with him too, hopefully even a chick, thought Ricky as he remembered Gary's workout session with him. He had a cute face, and his body wasn't bad at all for a human. But most of all was how easily he picked up the scent of Ricky's musk and the way it made him react. That made Ricky really excited.

"I'll have to keep my eye out for him at the gym, he should be here everyday now..." he trailed off thinking about the possibilities as his softening gray meat slipped back into the red fabric of his shorts. He carried the bucket over to a big mixing vat that had a reservoir being fed by a liquid supply line that connected to some treadmills. A few of them had other gym rats running on them. Their furry muscular bodies dripped sweat as they ran barefoot. The treadmills had a mechanism on the tracks, collecting the excess rat sweat and distributing it to the reservoir to add to the vat. Ricky wasn't lying when he said the ingredients were all natural. As natural as a musky musclebound wererat jock at least.

---

The next day, Gary couldn't wait to return to the Rattenburg Bros Gym for another training session with Ricky. He was pumped and ready to learn what Ricky had planned for him today, and eager to burn some calories and get shredded like the muscular gym owner. He hoped that he wouldn't embarrass himself too much with a stray boner, as he still wasn't quite sure what had triggered it the last time. The thought of Ricky or anyone else noticing it though only seemed to make his cock twitch.

"I'm going in for another workout guys. Any of you want to join me this time? The place is great. They've got all the latest equipment and the owner is a real nice guy," said Gary standing at the door wearing the same sweaty gym clothes he had the day before.

"Not thanks. It's about to be a new Pokemon event at the game store," replied Dex, not even bothering to look away from the Switch in his hands.

"And I'm busy working on that website redesign. Can't let that new UX artist outshine me. Good luck at the gym though. Maybe I'll go tomorrow," said Sandy who was typing furiously into her laptop.

"Alright. Maybe next time!"

Gary headed to the gym, feeling more pumped than ever. He had the whole day to himself, and he was looking forward to seeing Ricky again. He also felt that he'd already begun to improve since he joined the gym. He was starting to notice the change in his body, and it made him excited about his future as a buff stud.

When Gary entered the gym, he spotted Ricky in his 'costume' chatting up another guy and waved.

"Hey Ricky!" he called out.

"Gary! Right on time, bro. I like your style," said Ricky holding out his paw in a thumbs-up.

"Haha, I wouldn't miss it for the world."

"So today I want to show you a little about the equipment in the premium members only area. I think you're gonna like it."

"Cool! I can't wait to see it."

Ricky led Gary to the locked room at the back of the gym, which had a small lobby and Sweatshake dispenser, and opened it up. Inside were several more pieces of equipment, including one that looked like a miniature jungle gym with a large blue and silver rubbery treadmill contraption in the middle of it. There was also a device that looked similar to a cross country ski machine, but it had two ski-like footrests for both of your feet instead of just one.

"This is my own invention, inspired by a joke suggestion from my brother Rodney. I call it the Rattenburg Bros Gym Rat-Training Treadwheel. It's got all the bells and whistles, including a speaker system hooked into our RatTunes Spotify playlist so you can jam out while working out, and it gets your heartrate up real easy while it has you spinning," explained Ricky pointing out each feature while explaining their function.

"A treadmill that spins?" asked Gary.

"That's right. And I added an option to crank up the resistance, so you can do your usual cardio and lower body training simultaneously in one simple step. It's not only efficient but convenient too. There's nozzles all around the wheel that periodically spritz to help keep you cool while running in addition to built-in fans. I'm still working out the kinks though. It's not quite ready for regular use, but when it is it'll be life-changing," said Ricky.

"Wow, that's pretty cool. I didn't know you invented stuff," said Gary.

"Only for working out and helping people get in shape. There's also some low-tech stuff like wrestling mats, and a separate room for hot yoga. All for our premium members."

"Aw man, is this where you're gonna upsell me? I was just starting to like you too, haha."

"Nah, this is actually free for members on the annual plan after they've been here a few months or for people that bring in two others to join the gym."

"Wow! Really? That's a pretty sweet deal."

"It definitely is so try to bring some friends next time you come. Until then. Let's get our session going," said Ricky as he led Gary back out to the main area and just out of earshot of the lustful squeaks that were coming from the premium locker room in the back. They went over to the bench press.

"Time to work on your chest and arms, I'll do a set first to show you proper form and then I'll spot you for your sets," said Ricky sitting on the bench.

"Okay. Uh... You gonna take your rat costume off before we start?" asked Gary.

"Nope! I wear this thing so much it's like it's my own skin," said Ricky knowingly, "I work out all the time like this so no worries."

"O-okay. If you say so," said Gary, feeling a little awkward.

As Gary watched Ricky's muscles bulge through his fur while he lifted the barbell above him, he noticed just how much effort Ricky was putting into the workout. The bigger man grunted and groaned as he strained to push the 250lb weights up, his furry biceps bulging with every rep.

Gary couldn't help but stare at Ricky's glistening muscles. The fur on his body was soaking wet with sweat, and his bulge was prominent beneath his shorts. He could smell the masculinity pouring off the gym rat, and it made his thoughts a bit foggy.

"Having fun?" Ricky panted out between reps.

Gary nodded. He wasn't used to having someone as buff and masculine as Ricky around him during workouts, and it was definitely affecting him in unexpected ways.

After about 15 reps, Ricky stopped and looked at Gary.

"Okay, your turn. Don't be shy. This is about building strength and confidence."

Gary smiled and nodded. He had never been able to lift that much weight, but he was determined to do his best. He settled onto the bench and despite the shock of feeling the excessively wet squish of Ricky's corruptive rat sweat oozing out and soaking his ass and back, he only groaned with mild arousal as he tried to mimic Ricky's position. He gripped the bar and Ricky stood close above his head to help him lift it off the rack track. He could tell the weight was a lot more than he could handle but Ricky helped him ease it down and lift it back up.

"That's it, smooth and steady motions. You got this." said Ricky as Gary huffed and strained to lift. Ricky was just adding enough strength to keep it manageable for him. The musk from his large balls cascading over Gary's face as he pumped up rep after rep. It smelt potent, masculine, animalistic, and invigorating. He couldn't help but get an aching hardon as he continued lifting under Ricky's guidance. The smell of the wererat's nuts urged him on. He took on more and more of the weight himself, muscles straining under his burning fat as Ricky's balls dangled over his face. He could see them through the leg of his shorts, barely contained in a well-used jockstrap. The smell was so foul, but so good too. He could almost taste the sweat, but was too focused on his lifts even as salty drips pitter-pattered onto his forehead.

"Keep it up! That's 12!" shouted Ricky in encouragement. Gary hadn't even noticed Ricky's uncut cock was beaming hard under his shorts and jock pouch. The tip was starting to leak a generous amount of musky precum at seeing Gary soak in his ratty jock influence. Just as Gary pushed up the 15th rep a drop of corruptive rat precum fell from the tip of Ricky's tented shorts and landed on Gary's nose and lip. It was like a burst of testosterone and inhuman virility surged through him as he moaned and came in his shorts. He shuddered and nearly dropped the weight before Ricky pulled it up and racked it back on the track.

"Great job! You did it man!"

"Thanks..." muttered Gary. His face was flushed, and he was struggling to breathe. The musk was intoxicating, and he was lost in a haze of pleasure.

"Oh shit, uh... Sorry about that. My dick sweats a lot. I should have mentioned it haha."

"N-no problem," stammered Gary. He was still coming down from his orgasm, but he could feel his dick getting hard again. He tried to cover it up, but he knew it was noticeable.

"Maybe we should take a quick break before we continue the session," suggested Ricky.

"Um, yeah. Yeah that sounds good. Thanks," said Gary. His mind was still swimming in endorphins as he rose up from the bench.

"Of course, bro. That's what I'm here for," said Ricky with a chuckle.

"How about a quick Sweatshake and then we can do some dumbbell flyes?"

"Sure, that works."

Ricky grabbed two drinks from the stand nearby, handing one to Gary, who after one gulp started to down it as quickly as he could. Maybe it was an acquired taste, but it was starting to taste good. Really good, and it left him almost tingling with energy as he smacked his lips of the remnants.

As he drank his fill of the corruptive fluids, Ricky encouraged Gary to stretch his back and chest before moving onto the next exercise. He grabbed some weights and helped Gary set them up for his next set of reps.

"Okay, so now that you've done those, we're gonna do some light upper arm stuff with the dumbbells. Back on the bench," directed Ricky.

"Sure thing boss," said Gary enthusiastically.

Ricky nodded. "Good. Now you'll want to lie on your back and raise the weight up above you like this," said Ricky, demonstrating by raising his arms and bringing his wrists together.

Gary watched intently as he mimicked his movements.

"Good. Now get in 15 reps per set until you get a good burn in."

"Gotcha."

As Gary lay back on the bench, he couldn't help but feel a strangely pleasurable tingling sensation throughout his body. With every sweaty rep his chest hair grew and filled in across his hardening pecs. His pit hair became thicker and longer as drips of sweat fell from them. But all he could focus on was the workout. Well that and Ricky's musk.

He inhaled deeply and smelled the musk wafting from Ricky's body, especially his pits and crotch. It was intoxicating, and Gary felt himself growing hard again in his shorts. He was so busy enjoying it that he didn't realize his own odor growing more pungent as it mixed in with Ricky's. Their combined sweat soaked over his body as a line of hair crept up his fuzzy ass cheeks and up his spine until it reached his neck and lightly dusted his shoulders. He could feel his nut sack churning as heat radiated from his own sweaty crotch, too dumbed down from the pleasure of pumping weight to notice it swelling along with his cock slowly gaining a couple inches until it stretched the waistband of his shorts with his new growing virility.

Ricky, on the other hand, was more than interested in Gary's changes. He knew what was happening to the newbie and he loved every second of it. The corruptive effects of the wererat fluids were working their magic and Ricky couldn't wait to see the finished product in a couple more days, a hot sexy gym rat to join his crew. For now, he just stood there encouraging Gary through the workout while letting his body pour out his musk.

"That's it! You're really getting it bro. Keep going. It'll pay off, trust me."

"You got it Ricky," said Gary confidently.

"Now give it one last pump! Hold it up there for ten seconds. Go, go, go!"

"Yes sir!" shouted Gary. His arms shook as he held the weights up.

"Three.. two.. one! Great job, Gary. Take a quick break before we go to the treadwheels for your next workout" said Ricky, clapping his paws.

"Whew. Thanks Ricky. You sure know how to run someone through a workout, haha."

Ricky chuckled. "Well you seem like you're a natural. I've never seen anyone get into the groove so fast before. You must have a lot of natural talent, Gary."

"Really? Wow... thanks, Ricky," replied Gary.

Ricky patted Gary's shoulder and squeezed his new growth of pec muscles.

"I'll leave you to catch your breath, but don't forget about that break. I'm going to get started on my own workout for the day. You can join me once you're ready," said Ricky walking away with a grin and a subtle glance back at the ass of Gary's sweat-soaked shorts.

Gary couldn't help but feel a surge of pride from Ricky's compliment, and it only increased his desire to do well in his workout sessions. He couldn't wait to get started again. He wanted to look more like Ricky, and he was willing to work for it. He didn't stop to notice in his thoughts he wasn't even picturing Ricky as he looked when human, but as a big hunky wererat.

As Gary stretched, he looked around and noticed that there were very few people at the gym today. Even the ones who were there didn't seem very interested in talking to him or making conversation.

After about 3 minutes of stretching, Gary saw that Ricky was starting a new workout and decided to follow suit. He walked over to where Ricky was doing some push-ups and squats and knelt down beside him.

"Hey, Ricky. Need a partner?"

Ricky paused mid squat and grinned.

"For sure, dude. Get ready to get sweaty, haha. While I do squats, you do pushups and I'll add some weight to your back to really get the burn going."

Gary smiled and got in position to do his pushups. What he wasn't expecting was for Ricky to stand in front of him, facing forward and pop a squat on his upper back.

"Woah dude! What the hell, haha?" said Gary as his arms nearly buckled under the weight of Ricky's muscled ass.

"Hey man, I told you I was going to add some weight. I just didn't say what kind. Haha. This way you get the weight and I can go down as far as I can with my squats without getting too low. Now get pumping dude."

Gary gritted his teeth and struggled to do his pushups while Ricky repeatedly squatted on top of his back, but his resolve kept him going. He was determined to make Ricky proud and get a good workout in.

As Gary's back burned with effort, he noticed a familiar odor coming from Ricky's crotch.

"Ugh, dude! Why do you stink so much?" said Gary between breaths trying to distract from the fact that his hardon was grazing the padded floor with every push up.

Ricky just laughed.

"What, you don't like my scent bro? It's the natural smell of a sweaty, masculine, alpha gym rat."

Gary scoffed and continued working out. He couldn't deny though that he really did like the scent. It got him so pumped.

Ricky smirked to himself as he went back to his own workout. The combination of his musk, corruptive cum, sweat, and saliva were doing their work on the newbie. Gary's body was slowly transforming into a bulky ripped gym rat as he pumped his muscles with the corruptive fluids. He didn't know it yet, but Ricky knew that Gary's scent would soon become just like his own, a heavy male rat musk of sweat and testosterone. With every push, Ricky's balls bounced against Gary's head through his shorts. The sheer amount of sweat and precum coming off the alpha rat's cock and balls was soaking into Gary's hair, making it grow messy and a bit longer as the fluids soaked into the roots. His tail draped down Gary's lower back all the way to his hairy legs, and rubbed its own oily sweat into them. With a final push up, Gary gasped as the weight of Ricky's ass lifted off his back. He huffed and laid on the ground, gently grinding his cock into the mat before Ricky helped him up.

"That was great dude! I can already see the gains coming in. You're going to be ripped before you know it," said Ricky admiring Gary's improving sweaty physique. Already his chub was nearly gone, and muscles were swollen underneath the last bit of fat left. He was also already rocking a light dusting of chest, armpit, and leg hair that was becoming a little thicker by the hour. His facial hair was even growing more masculine, but nothing compared to the scruff Ricky was sporting.

"Fuck man, I think I need a minute...," panted Gary as he tried to catch his breath. He wiped the sweat off his face with a towel.

"All good man, I think you've done enough for today. Grab a Sweatshake and hit the treadmill while I go get something for you to take home with you."

"Sounds good," said Gary. He felt amazing and exhausted. He chugged down a free sweatshake from the dispenser while he waited for Ricky to return.

Ricky returned holding a yellowed jockstrap that radiated a musk that Gary instinctively knew was Ricky's.

"I wanna send you home with a treat," said Ricky offering the jock to Gary who stared moment at the tainted cloth. The straight guy in his brain told him something was super gay about that but Ricky hadn't made any passes at him. And the jockstrap was a gift. A fantastically smelly and sweaty gift.

"You don't want it?" said Ricky, his eyes piercing through Gary, a dominant aura pressuring him to accept.

Gary felt his still hard cock twitch as if goading him. The musk was almost like a soft haze around it. His nostrils flared with the odor as he licked his lips. His warping psychology and arousal won out and in seconds he eagerly took it.

"A jockstrap of yours? It smells amazing."

"I figured you would like it. You worked hard for it. Plus I noticed you've been freeballing it during your workouts. It's better to keep the goods in a pouch when you start sweating a lot."

Gary smiled as he took a sniff of the rank jockstrap and immediately felt his body react to the odor. His eyes dilated with corruptive endorphins. It made him feel strong and powerful, like he could do anything if only he kept inhaling the musk. He didn't realize how much precum his now 8 inch cock was drooling.

"Looks like you sprung a leak. Haha. Why don't you put it on and wear it home until our next workout. Don't want to leave a bunch of breadcrumbs back to your place," said Ricky with a rodentine grin.

Gary was in a state of bliss as he pulled his own briefs down to his knees. He pulled the jock up, the strap clinging to his fuzzy taint while the backstraps lifted under the cheeks his firm hairy ass. The sweat and cum-soaked cup swallowed up his hard dick and swollen balls, a wet bulge lathered the head of his cock with slimy cum, while the elastic band snapped up around his slim hips. His nuts were practically hanging out of the bottom, the furry sacks the same musky sweaty shade of gray as his pubes that poked through the fabric in places. Ricky kept an eye for any new patrons that might've seen, but the coast was clear. Only the regulars were in today.

"Alright, man. See you tomorrow. And don't forget to try to bring a friend or two. Preferably a chick but I'm not choosy, haha."

"S-sure thing, Ricky. I'll do my best to get my roommates to come," said Gary as he basked in the ratty jockstrap under his shorts. He looked at Ricky with an eager smile as the whites of his eyes yellowed from all the vermin influence he had received. Ricky smiled at the sight. Gary was his now. Heavily infected, increasingly bi, and thoroughly addicted to sweat, musk, and muscles. Just how he liked all his gym rats in training.

Gary headed home with a pep in his step and before he knew it was opening the door to his apartment. Dex and Sandy were home, still working on their projects on the couch. Gary couldn't help but flash his roommates a big toothy smile as he strutted in with an obvious boner in his shorts.

"What's up guys? I just got back from the gym," he announced proudly.

Dex and Sandy were a little shocked to see Gary so happy. Usually when he came back from the gym he was tired and annoyed, but today he seemed elated.

"Oh, hey Gary. How was the gym?" asked Dex, not bothering to look away from his screen.

"It was awesome! The owner gave me a bunch of new exercises to try and they're working! Here, look at these gains!" said Gary excitedly flexing in front of them.

Sandy finally looked up from her laptop, her eyes widening slightly when she saw Gary's increased musculature. She thought she might've caught a whiff of musk that somehow turned her on a bit, but assumed it was just her imagination.

"Wow, that's great! It looks like you've been working hard. I think I'm going to join you tomorrow if it's that good," said Sandy with a smile.

"You should. The facility is the best I've been in and you'd like the owner. He's pretty hot and gives personal training sessions to newcomers. First three days are free too."

"Oh yeah? Well say less. My back is starting to get stiff from sitting all day," giggled Sandy.

Dex's eyebrow perked up. He'd never known Gary to openly say a guy was hot. It was a little odd, but he chalked it up to his buddy just trying to get them to go to the gym with him.

"I'm good, but Sandy. Definitely confirm his hot guy status with me after you go tomorrow." said Dex with a wink before getting back to his game, "and Gary, you should probably take a shower. You smell like a men's locker room."

"And here I thought you'd like that," shot back Gary. Sandy fell out laughing with that one. They all knew Dex was gay, but he was so far from any stereotype he just came off as your everyday blerd.

"Ok, maybe a little," chuckled Dex.

"Well, I better change out of these clothes. I need to get some sleep anyways for tomorrow. I'm so pumped."

As Gary exited the living room he stopped by the kitchen to grab a snack and a drink before heading into his bathroom. As he opened the fridge, he couldn't help but notice a half-empty bottle of vodka that was hidden behind some juice cartons. It was tempting, but he had a workout tomorrow. Instead he grabbed an apple and a water bottle.

After peeling off his sweaty clothes he stared in the mirror in just his jockstrap and ogled his growing definition. His post workout swole was really showing and he loved it. His hairy thighs were starting to really bulge with muscle and his biceps were looking real good, as were his hardened pecs. The hair dusting his chest looked so manly and the tufts of smoky hair jutting from his pits looked like pure masculinity. His cock throbbed at the sight. Thinking back to Dex's statement, he took a whiff at one of his sweaty armpits and felt his cock burp out a glob of precum. Fuck he smelled good. Almost as good as Ricky. He could still smell Ricky on him. Yeah he could skip a shower. No way was he getting rid of that smell. That manly stink made him so horny. It was times like this he wished Sandy was less than platonic with him. He could really go for some hot hairy ass. Wait, girls don't have hairy asses. Do they? If they did it would be pretty hot though... Gary threw on a clean shirt and went to his room before he plopped down in his bed. He felt good about how his day went. His muscles were sore, but it was the good kind of sore, the kind he got after a great workout. He had made some really good progress with Ricky, and he was even looking forward to getting some more quality time with the big guy. As he lay in bed, his mind wandered to Ricky's bulge. He couldn't believe how big it was. He wondered how big it got when Ricky was fully hard, how big it stood unhindered by cloth. He pictured Ricky with a huge veiny monstercock and couldn't help but play with his own package.

He gripped his throbbing shaft and tugged at the wet fabric, a deep musky scent releasing from the pouch and wafting up to his nose. His dick leaked precum nonstop as he jerked his meat and breathed in more and more of Ricky's manly rat musk intertwined with his own.

He couldn't help but picture Sandy sucking his and Ricky's cocks as they rubbed their bodies against each other. He imagined himself kissing Ricky as Sandy bobbed up and down on their dicks. He felt the sensations on his cock, and it made him shudder in ecstasy. He never knew that he'd fantasize about a threesome with two guys and a girl, but he was more than happy to entertain the thought.

The feeling of Sandy's lips wrapped around his cock while Ricky's musky sweat poured over his body was all Gary could think about as he stroked himself off. He could imagine himself pressing his face into Ricky's armpit, taking in the stink as he fucked his tongue into the hairy sweat pit.

His fantasy shifted again as he felt the warmth of Ricky's yellow cum covering his chest and face. Ricky was standing over him, his cock spewing hot spunk like a hose all over Gary's muscular body as Sandy bounced on his dick and licked at Ricky's fat musky balls. The feeling was so intense in his imagination that Gary felt himself reaching his own climax. His body tensed as his cock exploded like a volcano inside the already wet pouch of his jockstrap, it was like fire and lightning running through his veins. The imaginary taste of Ricky's cock lingered in his mouth as his body shuddered and convulsed with orgasmic pleasure.

Gary's body twitched involuntarily as he tried to ride out his orgasm. His breathing slowed as he regained control of himself. The lustful ratty images of Sandy and Ricky faded from his mind, but the vermin musk dug itself in deeper as he drifted off to sleep.

The next day Gary was feeling a lot more energetic than usual. He woke up with a hardon and after a quick jerk session he met Sandy for the gym. He had a spring in his step that attracted Sandy's attention as they left.

"Wow, Gary, you look like you just won the lottery."

"Nah, just woke up feeling real good is all. Come on let's go get this workout done," he said with a bright smile and a wink.

"I'm glad I'm getting an escort to the gym," she said with a laugh.

As they walked up to the entrance Ricky was standing at the door, chatting it up with some of the gym regulars while wearing his normal sweaty attire. The ratty stench oozed from his pores. When he caught sight of Gary approaching, he waved them over.

"Welcome back! You brought a friend this time, good job!"

"Yeah, my roommate Sandy. She wants to lose a few pounds but we all gotta start somewhere," teased Gary, who got a slap on the shoulder for the comment.

"Haha, well the first session is always free, so we'll get you started," said Ricky while looking Sandy up and down. The interested gaze she gave back was just what Ricky was hoping for.

"Hmm... I guess I've got some time to spare today. I'll show her around the place," he said, beckoning the pair in with a nod.

Sandy looked a little unsure of herself, but she followed anyway. Gary didn't notice her hesitation because he was too focused on Ricky. He could almost taste the musky aroma radiating from the larger man, and he wanted more of it. He hoped that he'd be able to work out with Ricky the way he did yesterday.

When they entered the gym, Ricky led the way to the main workout area. As he walked ahead of them, Gary couldn't help but notice his butt and the way it jiggled with every step. He could see that the gym rat had a nice ass, and he couldn't resist the urge to sneak a peek. It was round and thick, and Gary wanted nothing more than to bury his face between those muscled cheeks. He was so distracted that he didn't hear Ricky speaking.

"Gary, you coming?" called out Ricky as he glanced back over his shoulder at Gary, noticing that his eyes were glued to his backside.

"Oh, yeah. Sorry, I was just... um... thinking about the workout," mumbled Gary as he blushed. He quickly looked away, embarrassed that he'd been caught staring.

Ricky smirked at that. He'd heard those words from other gym rats who had fallen victim to his charms. Not that he was surprised. He knew his body was irresistible. He couldn't wait to fuck Gary and Sandy and convert them fully to wererathood.

"Let's stretch and then get a quick warm-up on the bikes before we lift some weights," said Ricky after giving Sandy and tour with Gary following behind.

Sandy and Gary stretched out and hopped on their stationary bikes and pedaled away. Sandy quietly gasped as the seat for the bike squished under her and spread musky wererat sweat over her ass and crotch. She was a bit too embarrassed to say anything though and tried to focus on cycling with Gary as Ricky observed with a smile. Between the sweat, musk, and Sweatshake she drank, it wouldn't be much trouble to get her zoned out on the workout.

Ricky watched from a distance as the two sweaty humans cycled furiously. He had to admit that Gary's body had improved a lot in the last day or so. The transformation was slow, but it was still noticeable. Gary's muscles had filled out a bit, and he'd even gained a little extra bulk to his arms. His torso was leaner and more muscular, and his pecs had grown nicely. His chest hair was also growing thicker and bushier. It was a good start, and it made Ricky feel proud to be able to help Gary.

"Alright, let's move on to the weights," said Ricky.

"Finally!" exclaimed Gary, looking forward to using the heavier equipment. He wanted to get pumped and cardio was barely more than a boring appetizer for him.

"I want you to do some presses with the dumbbells first. You did really well on the bench yesterday, and I want to build up your upper body strength. Follow my lead," said Ricky, taking two dumbbells and placing them on a rack near a bench.

Gary and Sandy watched in awe as Ricky effortlessly picked up the dumbbells and began performing reps. It was impressive, and it made him want to lift too. After he finished a set he gestured to Sandy.

"Ladies first. Gary you can go right after and I'll spot you both."

Sandy sat on the bench and gripped the dumbbells, struggling to lift them. The scent of Ricky's sweat was overwhelming. It was like being engulfed in the musky cloud that followed him around, but this was concentrated. She found herself unconsciously lifting them higher, the rat stench clouding her judgment and rational thought. Her face flushed as his scent permeated through her clothing and skin. Ricky had to bite his lip to keep from snickering. He knew this routine all too well. It was always so cute when someone took that first whiff of his musk.

Gary watched with increasing interest as Ricky encouraged Sandy to keep pushing through her reps. She didn't seem like she was used to working out, but she was putting up a good fight. And it looked like she was enjoying it too.

As she lifted and lowered the dumbbells, Ricky stood right over her face, his crotch inches away from her nose. It didn't take long before Sandy couldn't resist the urge to inhale his musk. She kept inhaling, and she was so absorbed in it that she barely realized she was actually starting to do her reps correctly. Ricky chuckled to himself knowing she was hooked on his ratty odor. He was looking forward to her getting hairy, muscular, and growing a tail to match her soon to be straining breasts.

"Looking good! Keep it up!" cheered Ricky as Sandy's arms trembled with effort.

She exhaled with relief as she finished her last rep and set the dumbbells down on the rack. She could feel a light tingle in her muscles and her chest was throbbing with heat. It felt good. Really good.

"That was great! You're doing fantastic. Gary, you're up."

Gary was only too eager to hop on the bench and start pumping iron.

As he performed his reps, Ricky stood close by and instructed him on technique. He had a big smile on his face as Gary followed his directions to the letter, never wavering in his concentration. Ricky's scent was powerful, but Gary was determined to show his dedication. Ricky and Sandy both noticed how much more hair Gary had compared to yesterday. He was looking good and so was Ricky. He wasn't lying when he said Ricky was hot, she thought to herself. Even through the tight jockstrap and shorts Gary was wearing, they could see his erect cock throbbing with arousal as Ricky leaned over him and breathed out instructions. It was all the encouragement Gary needed.

As Gary neared the end of his set, Ricky began to loom over him. His scent grew stronger with every breath he took. He watched with amusement as Gary's nose twitched, his body instinctively responding to the smell. His tail swung wildly, and his nutsack churned and pulsed under the moist cup of his jock. Gary's arms shook as he lifted the weights one last time before setting them on the rack. His face was red, and sweat ran down his forehead.

"You did it! Great job, man! You were so focused I could hardly get a word in edgewise, haha."

Gary just grinned sheepishly. He had no idea how he managed to stay focused, but he was glad he did.

"Let's work on those abs next."

"Wait, what? Ab crunches?" asked Gary. He didn't really like ab crunches, but he was curious about Ricky's methods.

"Not just any crunches. This is a special exercise I've developed just for me. It's guaranteed to give you the results you're looking for," said Ricky with a grin.

"Okay... I'm intrigued. Show me," said Gary as he stepped aside.

Ricky's smile widened and his ears wiggled happily as he grabbed his phone to cue up a playlist of classic Rat Pack tunes. It was part of the training. The old-timey music filled the air as he jumped onto a crunch machine. He grabbed the handle above his head and braced himself. Ricky's body glowed with sweat as he began to twist and turn on the machine. Each movement caused his massive chest to heave and roll, bulging the confines of his tanktop. He grunted with every rep, his body twisting into different poses as the scent of his stinky body washed over them. It was like an erotic dance of manly muscles, sweat, and masculine musk. Ricky's body glistened with sweat, and his scent permeated the air. Gary and Sandy could only watch with fascination. They could feel their bodies start to react to his pheromones, their muscles tingling with energy and their genitals getting hotter by the second.

Ricky's voice cracked with a feral squeak as he got close to the end of his set. His body was on fire with sweat. His fur was matted and drenched. He could feel his testicles filling up with rat cum. It was almost like he was going into a rut. His mind was growing foggy as his thoughts were focused with the desire to breed as his body pumped out alpha muscle rat musk.

Just as he finished his set, his dominant mind forced the feral vermin rut to vanish. With a final grunt, he dropped off the machine, panting heavily. His body was coated in an oily damp layer of sweat, and his shirt clung to his muscular frame. His tail flicked in the air and his cock tented out his shorts, but he ignored it.

"Alright Sandy, you're up."

Sandy hesitantly made her way over to the machine. She didn't want to be too far from the big musky rat, but she could feel a heat building between her legs. The thought of doing the same movements in front of everyone made her feel self-conscious, but she was also very aroused by it. She gulped as she placed one foot in the stirrups and one hand on the handle. She could see the outline of Ricky's massive erection under his shorts, and it made her stomach flutter. Why was seeing something like that making her so horny? If anything it should've been a red flag, but something about the masculine musky smell of Ricky was too hard to ignore along with his upbeat ratty charm. His potent vermin pheromones guiding her in a trance-inducing cocktail that seemed more potent with her pre-existing preference for males.

Ricky watched with a smirk as Sandy nervously readied herself. He could sense that she was hesitant about this.

"Don't worry, you'll love it once you get the hang of it. Besides, you've got a great foundation to work with. You could do any workout in the world and look damn good while doing it," reassured Ricky.

"Y-yeah?" asked Sandy, a bit startled by Ricky's praise.

"Definitely! I might offer for you to join our promo social media team after you've been here awhile."

"W-wow. Thanks!."

Sandy wasn't sure what to make of Ricky's proposal, but it gave her a surge of motivation. It seemed like a much bigger deal, and she wondered why that was. Maybe it was because of how sincere Ricky sounded, or maybe it was because of the way he looked at her. Either way, it made her heart beat faster and her body tingle with excitement.

"Now start slowly with the first exercise, and you'll notice after the second rep you get this feeling of invigoration. It'll only get stronger as you push yourself and work out harder. Ready?"

"Ready!"

Ricky took out a handkerchief and handed it to Gary. Gary raised an eyebrow but accepted it.

"Your sweat glands will start working overtime after a minute or two. That's gonna be a lot of sweat. Good thing I'm here to make sure you don't go dry, haha."

Gary and Sandy nodded and waited for their signals.

"Go!"

At Ricky's command, Sandy and Gary simultaneously began their sets of core crunches, their bodies beginning to shake uncontrollably at the burning sensation in their abs. Gary's arms moved like pistons, pumping and curling through the motions as he brought his knees in as Sandy did the same. The sound of slapping skin reverberated through the air along with the twangy soundtrack. Meanwhile, Sandy's hands held the handles tightly as her back arched and flexed. The feeling was incredible. It was like an orgasm but without the mess. It was a rush of pleasure, but it never ended. Their muscles tightened and contracted as they twisted their bodies in various positions to mimic Ricky's movements.

Ricky stood at the side with his camera to record the process and his free hand busy at his shorts stroking his engorged member. The smell of their musk and the visuals of their quivering forms, especially Sandy's ample jugs bouncing with the movements, were driving him mad. The 3 other wererats in the gym were just watching in enjoyment, sniffing the air while their own dicks and clit grew hard under their shorts and underwear as they barely contained their vermin nature within human forms. The female watching, doing her best to stem the flow down her thighs coming from her furry ratty clit. The newbie and his hot roommate were breaking down just as Ricky knew they would.

Sandy's moans filled the air, and she struggled to keep her eyes open. She could feel her juices dripping down her thighs as the vibrations traveled through her entire body. She was so lost in the pleasurable heat that shimmered through her body she barely noticed that her clothes were soaking wet from her sweat.

Gary could feel his cock leaking copious amounts of pre into his jock, it was sticky and musky with sweat, pheromones, and corruptive cum. He wanted to grab it so badly, but he resisted the temptation. He wanted to wait until Ricky allowed it. He was sure Ricky wouldn't mind though, he could see the sweat-soaked tent in Ricky's shorts and his own dick was nearly poking out too.

As he worked, Ricky walked beside him and bent down to whisper in his ear.

"Focus on the moves, Gary. Don't think about your dick, just the moves and the pleasure. Embrace it," hissed the alpha rat before grabbing one of Gary's pecs and squeezing it.

"Keep those nips hard, man."

"Yes sir," replied Gary with a smile. He was feeling so good right now.

"That's my boy. Now just concentrate and go until you can't anymore."

He moved over to Sandy and pulled his precum soaked clawed hand out of his shorts and laid it on her stomach.

"Remember slow and steady motions, feel your body compress its muscles in your core and then slowly release. You should feel the heat of a good burn not just from your abs and crotch but also your obliques and waist," he said smoothly in her ear as his musk washed over her and made her cunt quiver. Her clit throbbed as she moaned, her body unable to resist his commands and powers.

"What do you mean by burn?" asked Sandy, her breathing heavy.

"I mean it feels good but you want more. Your muscles are building and just begging for more of that fire so they can get stronger. That glistening sweat keeps your skin cool as you soak in the heat of a good workout."

Ricky's musky voice soothed her as his cock slime-covered hands caressed her belly. She closed her eyes and continued to do the exercises as Ricky ordered. She could feel the heat of the pleasure rising in her, but it kept getting better and better. She could smell the tang of the sweat on her body, and she could feel the wetness between her legs.

"Trust me, you're going to want more than that. I know it feels amazing now, but I can guarantee you won't be satisfied until you're completely soaked with sweat and your muscles are burning with growth, haha."

He felt the effects of his corrupted cum-soaked sweat and saliva rubbing into Sandy's skin, making the sensations heightened for the moment as a light fuzz grew up from her crotch soaked in sweat and juices. It wasn't enough to stick out from her clothes, but it would soon.

"O-okay," she gasped.

"Just focus on the exercise. Let the pleasure of it wash over you, let it consume you."

Sandy nodded and did as Ricky told her, her pussy convulsing and squirting lightly as she did the workout. Gary's dick bounced eagerly in his shorts as he heard Ricky whispering encouragement to Sandy. He was so happy she joined him today. He couldn't wait until she was as pumped up and horny as he was, until they both were muscled and ratty like Ricky. He didn't even question how weird that thought was.

After a few more minutes, Sandy let out another moan and collapsed onto the floor, panting and sweating. The workout was intense, and it took all of her willpower to finish it.

"Fuck that was amazing," gasped Gary.

"Glad you enjoyed it. It'll only get better," said Ricky as he checked his phone. "Alright let's take a break and grab another Sweatshake before me move on."

"Sweatshakes? Is that what you call your protein shakes here?" asked Sandy curiously.

"Yep, and it's a very special drink. Full of vitamins, proteins, and natural sweeteners. And a little extra kick from our own proprietary naturalized water," explained Ricky.

Sandy was about to ask more, but Ricky was already walking away, so she followed him with Gary in tow. They quickly reached a refrigerator full of premixed shakes in bottles and Ricky grabbed one for each of them. He and Gary eagerly chugged theirs down and left Sandy to hold hers. Gary tossed his empty bottle to Ricky and it smacked into his palm.

"Dude, that shit is amazing. It tastes so good," said Gary. His voice was dripping with lust. He could feel the shake coursing through his body, adding to the feeling from the workout as his corruption was given more fuel.

"It's like all my worries and stress melted away," said Sandy. She took a sip and instantly felt rejuvenated. "Oh, wow."

Ricky grinned. The Sweatshakes doing their job. Gary was already addicted and Sandy would be too after a couple more. His instincts already told him the seed of infection was growing faster from her concentrated exposure and innate attraction to him.

"It's life-changing. Now let's move on to our next set of workouts," said Ricky.

Gary's mind was racing with possibilities, and his cock twitched excitedly at the thought of having Ricky's big, hard cock inside him. The thought of how gay that was only seemed to spur his arousal further as they followed Ricky to the next set of weights.

The session proceeded with the two newbies getting plenty of hands-on training with Ricky and fresh doses of his musk and sweat at every opportunity. By the end of it they were both huffing and panting, bodies glistening with sweat and clothes soaked.

"You guys did great. I'm really proud that you stuck it out the whole session Sandy. I can already see those abs coming in, haha."

"I-I-I'm so sore," gasped Sandy as she collapsed onto a nearby bench. She wiped the sweat off her face with her towel and sighed as she looked up at Ricky, "W-were you in that rat costume the whole time? I don't remember you changing into it?"

"I changed into it during one of your sets. I wear it to motivate the people that I'm training without making it too serious. You're here to enjoy yourself and the workouts you do while getting a nice pump in."

Sandy was so tired and huffing that his scent filled her lungs and forced her mind to accept that as his appearance calmed and intrigued her.

"It's so real looking. Can I touch your fur?"

"Of course, get a good feel for those muscles," said Ricky as he flexed a bicep. Sandy rubbed her hands through his damp fur and squeezed. The chorded muscle underneath vibrated and shifted under her fingers as she felt his strong warmth. She found herself, moving a hand to his abs on autopilot before resting there as the heat of his body rippled through her limbs.

Ricky could tell that Sandy was exhausted, but he couldn't help but admire the way her tits bounced in her top as she breathed heavily. He could also see the beginnings of the tuft of gray hair growing on her pubis and between her legs, matching the fine peach fuzz sprouting on her face, and he knew her nipples would be enlarged by the end of the day. She could only take in his influence.

"Alright you two. Take a Sweatshake each for the road and I'll see you tomorrow," said Ricky.

They both thanked him and grabbed two more bottles from the hydration station as they left in a horny daze.

"You guys smell so sweaty," said Dex, waving his hand in front of his nose.

"Well that's the point isn't it? Working out is all about building a sweat, haha," said Gary as he peeled off his shirt. His body was drenched and slick with sweat. He could feel the muscles underneath his skin throbbing with exertion. It felt amazing.

"It is. It's a very liberating feeling," said Sandy. She was leaning against the wall, her eyes half closed. Her hair was wet and plastered to her face, but she couldn't care less. "I'm tired though, so I'm going to go take a shower."

"Yeah, me too," said Gary.

Dex sniffed the air again and caught a whiff of something musky and heavy. He had never smelled anything like it before. It was intoxicating and he felt his cock swelling in his pants, but tried to ignore it as his roommates went to their respective rooms.

Gary threw his clothes into the laundry basket and headed into his bathroom. He turned on the shower and stepped into the water. It felt amazing on his skin, but he could still feel his body aching from the workout. His cock was rock hard, and he couldn't help but stroke himself to the image of Ricky's muscly body as he twisted and contorted on the crunch machine. The thought of Ricky's big dick made him cum quickly, but it wasn't enough. He had been feeling horny all day, and he couldn't quite explain it.

He grabbed some soap and started washing himself. The water felt amazing as it cascaded down his body, but he couldn't help but feel disappointed. His cock was still hard, and his body was still aching. He reached for the shower head and turned the dial up, letting the warm water flow over him. He sighed as he felt his body relax and he leaned back against the cool tile wall.

He was feeling better, but his cock was still hard. He reached down and grabbed his shaft, slowly stroking it. He imagined Sandy in the shower with him, running her hands over his body and kissing his neck. His cock twitched at the thought, and he stroked it faster, feeling the precum leaking from the tip.

He couldn't take it any longer. He pulled the shower head off the holder and aimed it at his cock, turning up the pressure. The sensation was incredible, and he felt like he was going to cum again.

"Fuck yes, that feels amazing."

He thrust his hips forward and pumped his fist around his cock. He was getting closer, but he couldn't cum. He wanted to so badly, but he just couldn't do it. His mind kept going back to the smell of Ricky's sweat and the muskiness of his scent. It was almost like the big, muscly rat was right there with him, touching and stroking him. Gary felt his cock spasm in his grip and he let out a groan as he finally came.

"Shit," he whispered, the sensation of his orgasm making his body tremble. "Am I going gay for a gym rat?"

Gary had no idea why he was thinking about Ricky like that, but he just couldn't seem to get the guy out of his head. He had never felt so attracted to someone before. Sure, he'd always liked girls, but he'd never fantasized about a man like this before. It was confusing and frustrating, and he had no idea what to do about it.

With a sigh, he turned off the water and grabbed a towel. He dried himself off and looked in the mirror. His eyes were drawn to the small tuft of gray hair on his lower abdomen, right above his cock. He brushed his fingers over it, feeling the coarse hair. He wondered if Ricky had the same type of body hair. He had seen some gray patches on Ricky's shoulders and thick tufts of blue poking from his armpits, but he didn't really pay attention to the rest. He'd have to check tomorrow.

As he walked into his room, he caught a glimpse of Sandy leaving hers and heading to the shower. Her back was turned and he saw the faintest hint of a thick patch of gray fur on her lower spine. The thought of seeing Sandy's muscular, naked body made Gary's cock twitch with anticipation. He was still feeling horny, and his balls were starting to ache. He had never felt so turned on before, but he tried to ignore it. As he did, Sandy was in the shower caressing her body under the hot water. She felt a bit disappointed she was washing away the scent and sweat of a good workout but who likes a sweaty girl? The hot water and soapy suds felt good, and she slowly began to enjoy it. However, the thought of Ricky and his sexy muscled body wouldn't leave her head. She loved the way his tanktop fit him and how it hugged his furry pecs.

As the warm water washed over her body, she slowly slid a hand between her thighs and gasped at the feel of how sensitive her pussy was. She had never felt so turned on before. A wicked grin spread across her face as she pictured Ricky's muscular body pressing against hers. The thought of feeling his strong arms around her made her shiver with arousal, and she rubbed her clit faster and faster until she came.

"Oh my god, that was so good," she mumbled, panting heavily as the warm water hit her face. She felt dizzy and euphoric.

The only thing she could think about was how horny she was and how good it felt to cum. She wondered if Gary was feeling the same way and what he was doing. The thought of Gary masturbating made her feel hot all over. She imagined his cock in his hand and his balls swinging freely. She licked her lips at the thought and began to rub herself again.

She closed her eyes and tried to imagine Gary's thick, hard cock. She wondered how long it was, how it would feel in her hands, in her mouth, in her pussy. The thought of his cum shooting into her mouth made her pussy quiver, as she stumbled out of the shower and dried herself off. Before long she was laying in bed fantasizing about Ricky and Gary, naked and sandwiching her with their hairy muscles. Her mind went into overdrive, picturing Ricky and Gary grinding against each other while she watched and pleasured herself. The thought of Ricky's large, bulging sweaty chest pushed up against Gary's smaller but equally firm torso made her wet. She pushed her hand down to her crotch feeling her clit throbbing and her cunt drooling while the other hand teased and squeezed her nipple.

"Fuck! I need to get fucked!" she growled in frustration. She reached over to her nightstand drawer and pulled out a vibrator and quickly put it to work as she thought about what Ricky's cock looked like behind the bulge in his shorts. How it would feel inside her as she sucked Gary's cock. With a stifled cry she came and her pussy splashed its juices all over her fingers as she fell asleep.

Her dreams were filled with images of Ricky, Gary, and her in the gym together. Ricky was wearing a tanktop and shorts that showed off his bulging muscles. He was forcing them to sniff and lick his nuts and the fervor of the dream had her sweating in her sleep restlessly as her body reacted to the growing gym rat infection that had been spread to her at the gym.

Gary and Sandy both slept fitfully as their bodies underwent minor changes under Ricky's influence. Their muscle mass increased slightly, the amount of fur increased but remained mostly hidden. They both had the beginnings of hairless tails which pushed out the end of their spines like small nubs. Their armpits were noticeably hairier as their bodies started producing a ratty musk despite their showers earlier. Gary's nipples hardened as his chest slowly widened and gained some definition. Sandy's breasts ached and swelled as their flesh started to increase in size with their blood thickened and the chemical makeup changing to produce milk. Gary leaked musky cum from his throbbing cock as Sandy's fuzzy pussy quivered and swelled as it oozed a slimy femcum in their sleep, an increasingly persistent byproduct of Ricky's corruptively ratty Sweatshakes and influence.

The next day was everyone's usual off day together and Gary and Sandy were happy to spend some time with Dex to convince him to go with them to the gym later. The two's increasingly ratty musk and sweat aiding them unknowingly.

Gary sat on the couch, idly scrolling through his phone and lifting a free weight as Dex and Sandy played a video game together. Dex glanced over and admired the way Gary's arm muscles bulged as he curled the weight. He hadn't really been that attracted to Gary before, but he couldn't deny how attractive his physique was becoming.

As he sat there, he caught a whiff of a musky scent wafting through the air. It was vaguely familiar, but he couldn't quite place it. It was almost like a locker room's smell, but a bit different. He felt his cock twitching in his shorts, but he ignored it.

"Hey Gary, can I see that weight for a second?" he asked, hoping to get a chance to touch it and feel the muscles up close.

"Sure, here ya go," said Gary, handing over the weight.

Dex wrapped his fingers around the bar, feeling the warmth of Gary's hand. He inhaled deeply, trying to get a better sense of that musky scent. It was intoxicating, and he found himself getting hard as he paused the game with Sandy.

"Thanks," he said, giving Gary the weight back.

"No problem. You and Sandy sound like you're really getting into that game," said Gary.

"Yeah, we're just trying to pass the time till we head to the gym," said Sandy as she nudged Dex in the ribs.

Dex smiled and tried to keep his mind on the game and not on his cock. He wanted to reach over and give Gary's bicep a squeeze, but he resisted the urge. Maybe he'd get a chance if he went to the gym with them. Then he'd get to see if the owner was hot like they said. The thought of checking out a muscled stud while his friends did the same sent a shiver down his spine and he gulped with nervous arousal.

"You sure you don't wanna join us at the gym? I'm sure Sandy and I could convince Ricky to give you a nice discount."

"I'm just worried about embarrassing myself. I don't want to look like an idiot," said Dex, glancing at the others and nodded in agreement.

"That guy is pure encouragement and takes all the embarrassment for you when he's wearing his rat mascot outfit."

"His what?" asked Dex.

"It's like this big rat costume he wears. He looks pretty ridiculous in it, but I gotta admit it's kind of cute," said Gary, grinning at the thought.

"And it looks and feels so real," said Sandy.

"That's so weird," said Dex, shaking his head. He couldn't believe that the owner of a gym would wear something like that.

"It kind of just fades into the back of your head after a while. I'm really liking the results so far, so I don't care. I just wish Dex would come along," said Sandy as she crossed her arms, and stuck her lip out in a mock pout.

Dex laughed and shook his head. It was hard to resist Sandy when she was being playful like this.

"We'll get access to the premium section if Gary brings one more friend. But I guess we'll never know."

"Alright alright. I'll go with you guys today," relented Dex.

"Yes!" shouted Sandy, pumping her fist into the air.

"That's awesome man!" yelled Gary, reaching over to high five Dex.

As their hands touched, Dex felt a jolt of electricity shoot through his body. He looked at Gary and saw that the other man had the same look on his face. His eyes were wide and his mouth was slightly open. He stared at Dex, his hand still outstretched to extend the direct contact before suddenly breaking it.

"Ahem... that's awesome, Dex. I knew you'd come around," said Gary, a blush forming on his cheeks as he looked away.

Sandy giggled, "It'll be great, Dex. Ricky will treat you so well. He's really good with newcomers and making sure they get what they want from their membership."

Dex frowned slightly. Why did her words send a chill down his spine? Was she implying something else? He shook it off and chalked it up to paranoia.

"So when are you guys going?" he asked.

"Right after lunch. I've got a few more warm-ups I want to get in before we head out," said Gary, standing up and stretching.

"I could go for a quick stretch myself to loosen up after gaming on the couch the last two hours," said Sandy, getting up from the couch.

"Okay, I'll be ready to leave when you guys are," said Dex, starting a solo game to ignore the chubby in his shorts.

Gary and Sandy both waved to Dex as they left the room. As they did, a familiar musky scent drifted towards him and he shivered in anticipation of their return.

Gary and Sandy both walked down the hallway to their rooms buzzing with lustful energy and stopped to sniff the air. The aroma of their combined musk had them both in a fog as they looked at each other.

"Gary, you're starting to look so ripped and sweaty. It's driving me crazy," said Sandy as she pressed herself against him and sniffed into his chest.

"You look good too. I'm loving how your tits are filling out those tops, and your smell is making me throb," whispered Ricky in a huff.

"How about I join you for a quick stretch? It'll help us both get ready for our sesh with Ricky."

"I was thinking the same," said Gary as she followed him into his room.

They locked the door behind them and stripped down to their underwear. Sandy looked Gary up and down, admiring the way his muscles strained across his body. His skin was oily and toned, and he was sporting a nice dusting of smoky gray fuzz on his legs and torso. She could feel her body heat up as she gazed at his growing masculinity.

"Holy shit, Gary! Your body is fucking incredible!" she exclaimed.

Gary blushed and rubbed the back of his head awkwardly. "I-I guess it's really coming along, huh?"

She ran her hand over his pecs and abs, squeezing and rubbing them. She could feel his muscles rippling underneath his skin.

"Fucking hell, they're so firm," she murmured as she traced her finger along one of his abs.

Gary chuckled, his eyes glued to Sandy's jiggling tits as she stroked his muscular body. His cock twitched as her hand trailed lower and lower, and his heart raced at the thought of her touching him there. He had never wanted her this badly before, and it was making his head spin.

"Sandy, you're so hot," he said in a low voice.

Sandy bit her lip and grinned mischievously. She reached down into his shorts and cupped his big fuzzy balls through the well used jock-strap in her palm.

"Mmm, and these feel so good and full," she purred, squeezing and kneading them, "I love how hairy you're getting. It's so fucking sexy."

He moaned softly as her hands massaged his sweaty nutsack, sending a wave of pleasure through his body. His cock twitched and swelled in his jock as she leaned in and planted a kiss on his lips. He returned the kiss passionately, their tongues intertwining as they made out. The taste of her saliva was intoxicating, and he found himself wanting more. His hands found their way to her breasts and he began to massage them as their kiss deepened. His thumbs flicked across her hard nipples as his tongue explored her mouth.

Sandy eagerly started stroking his 8 inch cock through the jock. The combination of Ricky and Gary's cum and sweat soaked into it poured over her hand in wet sloshes as the ratty musk concentrated there filled her nostrils. She pulled her hand free and broke their sloppy kiss as she looked at the clear yellowed cock slime dripping down her hand as the nails slowly grew longer. With not a moment's hesitation, she licked her hand clean. The sheer virility overrided the salty taste as the whites of her eyes yellowed and she huffed out a high pitched sound before she pulled down his shorts to let his fat uncut shaft spring free and slap his hairy stomach with a wet splat. The air filled with his musky male stench and it only made Sandy's libido skyrocket.

"That smells so fucking good, Gary," she said, her eyes wild with lust.

"Fuck, it makes me so horny," he gasped as her hands stroked his throbbing shaft.

She dropped to her knees and pulled the soiled cup to her mouth and slurped up the mix of sweat, musk, and cum. She moaned with pleasure as the sour salty mixture spilled over her tongue and made her hairy pussy quiver and pulsate.

"Oh, fuck. That's so hot," he groaned as he watched her slurping on his dirty jock.

She removed the cup and licked the remnants of cum and sweat from the material, face smeared with the corruptive fluids. Her hands roamed over his thighs, enjoying the feel of his muscles flexing underneath them.

"You're so hot, Gary. You're gonna be buff and hairy like Ricky," she said, her voice hoarse with desire.

Gary's eyes widened as her hand stroked his balls and her other hand grasped his cock, pulling the foreskin back and exposing his throbbing red mushroom tip. The stink had her eyes flutter as she wrapped her lips around it, suppressing a gag as she started to suck and slurp up the musky juices soaked into it. Her throat opened and the massive shaft was stuffed into her esophagus as her nose buried into his sweaty sack and the matted cum stained pubes tickled her face. The scent and stench made her nearly black out as she choked and coughed on it, but her fingers kept her mouth spread open around his girth.

Gary moaned in pleasure as his hands found their way to her scalp. He grabbed her hair and pulled her in closer, forcing his cock deeper into her throat. Sandy's eyes rolled into the back of her head as the thick meat rod violated her throat.

Sandy's lips formed a tight seal around his shaft as she bobbed her head up and down, sucking and slurping on his dick. Her eyes watered as he pulled her head down, but she didn't stop. She wanted his cum, and she was determined to get it. Gary felt his orgasm approaching and he threw his head back, groaning in ecstasy as his body tensed up and he began to shoot his load into Sandy's mouth. She swallowed it eagerly, savoring the salty muskiness of it.

Their bodies were both covered in sweat, and the air was filled with a thick musky scent. Sandy's fur had grown out a little more on her legs and dark sweaty pubic fuzz poked out from her underarms, but her nipples were now larger and firmer than they were before. They stood out prominently on her breasts as she wiped the sweat off her forehead. Gary's balls were larger and filled with his increasingly infected seed, and his cock had a nice thickness to it. He could feel the urges coming over him, but he didn't care that he didn't have a foreskin before now. The way Sandy's tongue slid under it as she swallowed down his load had him gasping with lust. Their spines popped as a line of gray fur crawled up from their lower backs, getting thicker as it reached their shoulders and the bottom of their hairlines. Sandy pulled off his cock and quickly shed her soaked panties and before presenting her wet musky pussy to Gary as she looked over her shoulder.

Gary took one look at her sopping wet cunt and plunged his face in between her legs, lapping up her juices like a dog. His tongue flicked across her swollen clit, causing her to shudder in pleasure. She began to grind against his face, moaning loudly. Her juices dripped down his stubbled chin and onto his hairy chest. He reached down and began to play with her larger tits, squeezing them and pinching her fat nipples.

"Oh fuck! Gary, that's so good," she panted just above a whisper. The both of them compelled by the rodent infection spurring their lusts.

Gary continued to lap at her pussy, his cock throbbing in anticipation of its turn at her folds. He was desperate to bury himself inside her, but he didn't want to stop what he was doing. She tasted so good, and the sounds of her moans were like music to his ears. He wanted to hear her scream in pleasure, but he didn't want to stop eating her out. He reached down and started stroking his cock as he feasted on her pussy. He could feel her juices running down his face and chest, and it was driving him wild.

"God, you're so sexy," he gasped between slurps on her snatch.

He could feel her trembling beneath him, and he knew she was about to cum. He doubled his efforts, pushing her over the edge. She whimpered out in pleasure as she orgasmed, her body shaking violently and her pussy squirting. He lapped up as much of her juices as he could, drinking her like a fine wine. His own cock was throbbing painfully, and he couldn't wait to give her a big injection of his cum. He pulled back with a dopey bucktoothed smile, the stubble on his face thicker as his muscled body radiated locker room rat BO despite his retained humanity. He gripped Sandy's hips in his meaty hands and slid his fat cock into her slobbering cunt. They both let out an involuntary squeak as their genitals joined. Her folds stretched around his cock as they slowly received all 8 inches of his length.

Sandy gasped in delight as Gary's cock entered her. It was so big and thick, and it felt so good inside her. She couldn't help but moan as he began to thrust into her. His movements were slow at first, but they quickly picked up speed as he found a rhythm. Her body shuddered with pleasure as he pounded into her, his balls slapping against her ass with each thrust. She could feel her pussy beginning to swell and her clit growing harder and fatter as her ratty transformation was inched further. Her teeth started to become more bucktoothed and her oily skin grew darker with a faint grayish tint. Her nose became larger and more pointy as her lips hung open.

She gripped the bedframe tightly, her long nails scraping against the wood as Gary thrust into her. She was in a haze of lust and ecstasy, and all she could think about was the sensation of Gary's cock moving in and out of her. She was getting closer to cumming again, and she could feel the pressure building in her core in waves of heat. Her toes began to curl in pleasure as she arched her back. Gary grunted in response, his own senses heightened from his ratty nature. Their ears pointed as they took in the wet smacking sounds of their humping. She could feel the hairs on his chest brushing against her back as his musky odor permeated the room, mixed with her own. He bit down on her shoulder gently as he pumped his dick in and out of her, his testicles slapping against her with each thrust.

Sandy felt like her entire body was on fire with lust. She could hardly think straight as Gary pounded her enlarged pussy. The hair on her forearms and calves thickened as she pushed her ass back into his thrusts, imagining it was Ricky fucking her, breeding her. Gary was feeling the same way as Sandy's tunnel was a wet and heated sheath of moldable flesh that was accommodating his cock. All he could think about was the feel of her warm and musky body against his, and the scent of her sex surrounding him. He was getting closer and closer to cumming, but he was trying to hold back. He didn't want it to end just yet.

Sandy felt her body tensing up as she got closer to her release. Gary's thrusts were getting harder and faster, and his breathing was getting more labored. She could tell he was getting close to cumming, and she was too. She pushed her ass back against him, encouraging him to keep going. She could feel his balls smacking against her as he drove his cock deep into her. His precum was mixing with her juices and his sweat was soaking into her as she moaned out in bliss.

As Sandy felt herself about to cum, she let out a loud squeak and Gary came as he joined her, his balls exploding inside her. Sandy's whole body trembled and shook as she felt Gary's cum shooting into her womb. He gave one final push and collapsed on top of her, panting and sweating. His body was warm and comforting against hers, and she could feel his heartbeat pounding in his chest.

"F-fuck," he gasped, "that was amazing."

"It sure was," she whispered as her eyes slowly closed, a smile on her face.

"That's what I call a good stretch. Let's grab Dex and head out in 15."

Sandy nodded and tried to calm herself as she felt her body absorbing Gary's semen. The orgasmic slime leaking from between her hairy thighs felt good.

Gary and Sandy both quickly redressed and sniffed each other's musk as they straightened themselves out, the heat of lust still radiating through them.

"C'mon. Let's go get Dex. I'm dying to hit the treadmills."

Gary nodded and followed Sandy out of his room. She walked towards Dex's room and knocked on the door.

"Yeah?" asked Dex.

"Come on. It's time to go," said Sandy.

"Just gimme a sec," replied Dex as he finished putting on his sneakers.

Sandy and Gary waited outside for Dex. Once he was ready, they all walked downstairs to the lobby. Gary was sporting a bulge in his pants that made it obvious that he was hard, but he didn't care, something Dex tried to ignore. The three of them left the apartment building and headed for the gym a few city blocks away.

Ricky's scent wafted from their skin and clothes, adding to their musk. It was an invisible but potent presence that guided their thoughts and actions as it meshed with and warped their own natural odors. The corruption that was brewing inside them, making their bodies ache for Ricky and more. Dex found himself less and less repulsed by the potent BO as it lulled him and kept his paranoia in check. He was too busy ruminating about what the gym would be like to notice the slight changes in their appearance.

They arrive at the gym with Ricky surprisingly 'out of costume' when he greets them. Ricky's scent instantly hits Gary and Sandy's twitching nostrils, and they are filled with a desire to be near him. The ratty musk overpowered their senses and made it hard to think as their libido spiked. Their feet take them forward to Ricky before they even realize it with Dex following behind. Dex watches in awe at the trio, amazed by Ricky's charisma and his confidence. Dex started to also find himself wanting the musky man's attention against his better judgment. He doesn't notice the steadily growing changes Ricky's presence stirs in his two roommates.

Gary and Sandy start to sweat immediately upon arriving and they are soon covered in a layer of sticky sweat. Their musk starts to intensify, blending together with Ricky's. Their minds are completely focused on Ricky.

"Hey there, my two favorite newbies! And it looks like you brought a third this time! Awesome!" said Ricky greeting them with a large smile and roll of his pecs. His voice boomed with a confidence and power that was hard to resist. Dex found himself transfixed by Ricky and the way his muscles flexed as he spoke. The muscular gym owner subtly sniffed the musk coming from Sandy, and his grin spread larger. He could tell she had been bred recently. By Gary no doubt. Perfect. It would speed along her changes and get her pussy quivering for his rat cock even more.

"Hey there Ricky! This is my other roommate, Dex," said Gary with barely contained excitement as his cock twitched and spurt precum in his shorts and Sandy rubbed her thighs together to the point where her camel toe was imprinted through the fabric of her yoga pants.

"Well hello there, Dex. Nice to meet you," said Ricky, holding out his meaty hand.

Dex hesitated for a moment, but he eventually reached out and shook Ricky's hand.

"Nice to meet you too, sir," said Dex, trying not to sound intimidated.

Ricky laughed, "Please, none of that 'sir' crap. I'm only 34. Just call me Ricky."

Dex nodded, a little overwhelmed by how friendly Ricky seemed. He couldn't help but feel a little bit drawn to him, despite his reservations. The musky air made it hard for him to think clearly.

"Thank you for being so welcoming. I really appreciate it," said Dex with a small smile.

Ricky put his hand on Dex's shoulder and gave him a reassuring squeeze, "Of course! I'm always here for my members, especially newbies. You just tell me if you have any questions or if you need any help with anything. I'm here to help."

Dex nodded, feeling a little more at ease and a stirring in his shorts as he stared at the handsome muscular man. Was... Was he into guys?

Gary and Sandy stared at the pair with their mouths open. Gary could feel his dick straining against his shorts and his mind was foggy with lust. He wanted to touch Ricky so badly, but he couldn't bring himself to do it. Sandy felt the same way, her nipples were hardening and her hairy pussy was getting wet.

Ricky noticed the two staring at him and he raised an eyebrow. "Is everything okay?" he asked, looking between them.

They both shook their heads, blushing a little as they were snapped out of their daze.

"We're just excited to get started," said Gary.

Ricky smiled, "That's what I like to hear! How about you guys grab a Sweatshake and we can get started."

"Sure thing!" said Gary as Sandy and Dex followed over to a cart with prefilled Sweatshake bottles.

"What's a Sweatshake?" asked Dex as his inquisitiveness pierced through the growing fog of arousal.

"They are Ricky's own personal protein shake he created to maximize gains," said Gary as he grabbed a bottle.

The smell hit Dex's nose and he was hit with a wave of nausea. It was a disgusting mix of sweat and musk, and he gagged at the stench. Gary and Sandy were completely unfazed by the smell and drank down the contents of the bottles eagerly, their bodies thrumming with energy as the cum, sweat, and breast milk quickly started to absorb into their bodies.

Ricky saw how the shake affected Dex and quickly stepped forward to try and salvage the situation, "The first taste is always the worst, but the shakes are pure magic. People swear that drinking one of these daily does wonders for your body and they aren't lying."

Gary and Sandy both nodded in agreement as Dex inspected the bottle. He couldn't deny that they both looked much more toned than before. Sandy especially after just one day. He slowly sipped at his drink, holding back a gag before drinking more.

"See? It's not so bad after the first sip," said Ricky.

Dex swallowed and grimaced, but he couldn't deny that he did feel more energetic after taking a few swigs.

"I guess I can't expect anything healthy to taste like some sugar-laced smoothie," said Dex, shrugging.

Ricky patted Dex on the back and smiled, "Attaboy. Now go hit the cardio room with Gary and Sandy. I'll see you in there after I've got these empty bottles."

"O-okay, thank you," said Dex, still unsure about whether he liked Ricky despite his attraction to the big man.

They all head to the cardio room to start a warm up on the treadmills. The room was muskier than the main area and hot too. Dex wanted to cover his nose, but he couldn't while running so he just hopped on a treadmill next to Gary and Sandy who both started off nearly sprinting.

Gary and Sandy ran beside each other, both of them covered in sweat as they did. They exchanged glances, and Sandy smirked at him as she put the supplied headphones on with Dex doing the same. The music was a throbbing beat that seemed to vibrate through their brains, soothing and arousing with every thrum.

Dex felt out of place as he slowly jogged on the treadmill. He knew he was out of shape, but he never thought it was this bad. He looked over at Gary and Sandy, amazed that they were able to run so fast without getting tired. They seemed to be in another world entirely, but as the music filled his ears he zoned out and just felt his muscles itching for the run as he slowly increased the speed.

Sandy could smell the two next to her. The masculinity and the hint of much more coming from Gary. It made her pussy quiver as their sweat was collected by the treadmill and fed into another room. It wasn't long before Ricky appeared and pulled them out of the running daze to start their main workout session.

"You guys ready to get pumped!" he said, looking as ratty as he was born.

"Woah. What? Is that the trainer?" said Dex as he hopped off the treadmill and looked at the muscular rodent that was Ricky.

"Yep! Ricky, at your service! Are you ready to get pumped!" said Ricky, his arms flexing.

"Um, yeah. But why are you wearing that outfit?" said Dex, feeling a bit uncomfortable with the sudden change of appearance.

"Dude, relax. He does this for all the newbies. He looks silly, but it's a real boost to morale and seeing the mascot cheering you on makes the workouts more fun," said Gary, pushing Dex towards the free weights.

Ricky smiled, "Don't worry you'll get used to it. I can't call this Rattenburg Bros. Gym without having a gym rat to look the part, right?"

Dex eyed Ricky cautiously. He still didn't quite trust him. The sudden change in attire only made him more suspicious.

"It looks so real though... Well, whatever. I just want to get a good workout in," said Dex, grabbing some dumbbells.

Ricky smiled, and he led Dex through a series of exercises. They started simple, and gradually progressed to more challenging ones. Dex could feel his muscles burning as he lifted the weights, but he pushed through the pain. He was surprised how easy it was to focus on his workout. He had expected to be distracted by the absurdity of a human in a rat mascot costume, but he was actually quite impressed by Ricky's abilities as a personal trainer.

Gary was practically vibrating with energy as he worked on his biceps and triceps. His shirt was soaked with sweat, and he couldn't stop smiling as he watched Sandy and Dex working out beside him. Their skin glistened with perspiration, and their muscles rippled with exertion.

His skin felt like it was on fire, and he had never felt this energized before. As he pressed the heavy weight in front of him, he could feel his abs tightening and his pecs flexing as they steadily grew. He glanced over at Sandy, who was on a machine working her bulging glutes and thick muscled thighs. His eyes drifted down to her rear, and he found himself wondering what it would be like to take her from behind.

As they moved on to the squat rack, Gary's heart raced. He felt stronger than ever, and the thought of lifting the weights made his cock stiffen in his shorts. Ricky's furry rat head grinned at him as he encouraged him to lift, and he found himself grinning back as he hefted the weight and began to squat.

The room was hot and musky. The smell of sweat and testosterone was intoxicating, and Gary breathed it in as he squatted. He felt his cock swelling as he moved, and he found himself thinking about when he had seen Sandy naked. He wondered what she would look like covered in sweaty fur with her legs spread. He wondered what it would feel like.

These thoughts only fueled his arousal. His cock was rock hard and poking through his shorts. His mind was fuzzy with lust as he squatted, his cock bouncing with each repetition.

"Fuck," he whispered under his breath.

He tried to focus on his exercise, but he found himself thinking about Sandy and her bare tits. He imagined her laying on a bench, her tits jiggling as he fucked her. His cock pulsed with need as he squatted, his mind filled with images of her sweaty, fur-covered body, thick vermin tail and a hot slobbery muzzle to suck his cock after a good workout.

Sandy's thoughts were filled with images of Ricky fucking her as well as Gary as she spotted him at the rack. The weight of the bar on her shoulders added to the experience as the growing rodent infection filled her with unrelenting lust. Her muscles were starting to ache with exertion, and her fur had grown out slightly across her body. The scent of male musk filled her nostrils, and she found herself becoming increasingly aroused.

She could feel her cunt dripping with her juices. Her nipples were hard, and she found herself wishing that she was naked so she could feel the cool air on them. She was getting close to cumming from heat and pleasure of her muscles growing, but she forced herself to keep going.

"Fuck," she whispered as she struggled to maintain her grip on the bar.

Gary's arms were trembling, but he pushed through the exhaustion and managed to complete his last rep. His muscles were burning, but he felt good. He looked down at his body and was shocked to see how muscular he'd gotten. His pecs were bigger and more defined, and his abs were showing. Even his ass had more definition, and his arms were like tree trunks.

"Wow, I'm looking really ripped," he said, admiring his body.

He was about to put the weights back on the rack when he caught sight of Sandy. She was sweaty and flushed, and she looked absolutely stunning. Her eyes were half-lidded and her nipples were poking through her thin tank top. He found himself wondering what she looked like naked.

Gary found himself imagining what she looked like with her sweaty fur covered body. Her hairy thick slit dripping with juices. He could see her hairy musky pits and thick hairless tail whipping out behind her. The thought sent a shiver down his spine, and he felt his cock spewing musky precum into his tented shorts.

Sandy and Gary were both feeling the effects of Ricky's influence as their bodies slowly transformed. Their eyes were glazed over with lust, and their thoughts were clouded by the overwhelming desire to fuck and lift. The combination of the ratty musk and the weight of the weights on their muscles pushed them closer and closer to the edge of climax. Sandy huffed and moaned as her teeth grew buck and pointing nose twitched. Short whiskers poked out her upper lip as her jaw cracked forward with a barely audible squeak. The gray sweat damp fur thickened and spread over her body as swelling fingers gripped the bars, nails curling out into claws as her muscles bulged and strained. The nub at the end of her spine pushed out above her fuzzy ass cheeks as her feet twitched and swelled in her sweaty trainers. Her thoughts were foggy with lust as her cunt throbbed and dripped with musky juices.

Gary was experiencing a similar change as he grunted and huffed in pleasure. His thoughts were focused solely on sex and getting pumped. He could feel his cock straining in his shorts as he lifted, and he found himself wishing he could free it.

Sweat dripped from his fuzzy forehead and stained his shirt. He could feel his dick throbbing in his pants as his body changed. His muscles bulged and hardened as they grew more toned and defined. He was getting close to cumming, and the thought of the mess he would make only made him want to cum more.

The air in the room was thick with musk and the smell of sweat. It was heady and intoxicating, and it made it hard to think clearly. Sandy and Gary found themselves drawn to the ratty musk oozing from their pores that mixed with the musk of the other rats in the gym. A ripping sound drew Gary's attention and he looked over to see Sandy's thick rat tail piercing through her yoga pants, growing longer than her legs her head cracked and shifted into a gray-furred vermin muzzle with damp black hair reaching to her shoulders. Her tits grew another size in her straining sports bra as thick nipples began staining the front with gym rat milk. The sight of her going full gym rat was too much for Gary, and he found himself squeaking from his growing muzzle as his cock bounced and fat churning nuts lifted before surging ropes upon ropes of thick yellowed cum up and out his 10 inch shaft. The corrupted seed soaked and beaded through the fabric of his shorts as his corded tail ripped through the rear. Thick slimy drops of rat cum dribbled down his furry legs and onto the floor as his musky paws tore through his sneakers. The release warped the rest of his thought processes, every twitch of his cock dropping his intelligence a few points and replacing it with jockish rat priorities.

Sandy watched as Gary's body rippled with lust and pleasure. His dick tented his shorts and his balls ached as he shot rope after rope of cum into them. She could feel her own cunt throbbing with need as she watched him transform into a gym rat. His body was hairy and muscular, and his cock was enormous. His tail flicked behind him as he panted with pleasure.

She felt her body responding to his, and she could feel her muscles flexing and hardening as her skin thickened and darkened to a gray hue. Her nipples were engorged and sore, and her breasts felt full of milk. She could feel her tail wriggling through her shredded pants, and her thoughts were dominated by the gym rat infection that fevered through her brain. Her mind was foggy with vermin lust and arousal.

"Fuck," she squeaked.

The scent of her fellow wererats filled the room and she couldn't help but inhale the addictive stink. It was warm and inviting, and she felt her body trembling. Her eyes felt heavy and her cunt throbbed with desire as she stared at Gary. Her own feet ripped through her shoes, fat claws toes spreading sweat and musk from her big paws as her spine popped and extended her height. Her cunt swelled and gushed in orgasm, coating her crotch and the seat of the leg machine with slimy ratty femcum. Her brain contorted under the influence of her corrupted body, awash in musclebound rodent lust as it dumb down to jockish levels that would make her the perfect muscleheaded she-rat.

The two newly reborn gym rats squeaked as they marinated in their juices and rose off the equipment to see Ricky helping Dex finish a set.

"Okay, that was great work today, Dex. We'll work on your triceps tomorrow, and then we'll move on to the quadriceps and the calves," said Ricky.

"Sounds good to me," said Dex.

He wiped his brow with the towel, and then looked around the gym. There was a strong musky scent in the air, and the atmosphere was relaxed and comfortable, but he couldn't quite let go of his unease. His gaze drifted to his roommates and his eyes widened in horror at seeing the two sweaty musclebound rats that took their place. Sandy's tits had swollen, and her head had shifted into a big-jawed rat face. Gary's head was similarly shifted with a furry jaw that had thick stubble pushing through the fur as they both wore their clothing in tatters with their muscled furry bodies and oily tails exposed. They both held up their clawed paws to flex, showing off their beefy jock forms. Ricky turned around to see their transformation, a big ratty smile spread across his mouth.

"Well, looks like everyone's enjoying themselves! Sandy, Gary, you two look amazing. Keep up the good work!" said Ricky, walking over to them.

They both smiled and squeaked, flexing their arms and chests. Dex watched in disbelief as his friends interacted with Ricky, their minds clearly altered by whatever had happened to them. He could feel his own muscles aching from exertion, and he found himself wanting to keep going. He wanted to be just as muscular and sweaty as the others, and he wanted to feel the same satisfaction they all felt. He shook off the foreign thoughts, recognizing them for what they were now. He had to get away.

"What did you do to them!?" he shouted at Ricky as the three rats turned to address him.

"Oh, just helped them embrace their inner rats. No reason to fight it, Dex. It feels incredible being this pumped," Ricky said, flexing his muscles as his soggy jockstrap stretched around his tented groin and buttocks in his shorts.

"It's great Dex, SKREEE! I just love how my muscles and fur feels. My nipples and pussy are so sensitive I could have an orgasm standing up!" said Sandy eagerly with a smiling rodent muzzle.

"Once you go rat, you don't go back dude!" said Gary stroking his cock through his cummed up shorts.

The stink of the gym rat stench was pervasive and pungent, and it was impossible to ignore. Dex tried to block it out, but it was everywhere, and it made his head swim. He started to back away.

"Fuck, he turned you guys into freaks. Rat freaks at that. S-stay away from me!" said Dex as he looked up at his rattified roommates that both now stood taller than him and approached. He made a run for it. Not thinking about where he was headed as he found a door that was surprisingly unlocked and ran inside.

Ricky and his two new gym rats followed him on their sweaty paws, snickering and squeaking as they followed Dex into the premium member's area. There was no escape now. He had entered the belly of the beast, and he would soon join the gym rats in their musky musculature. Dex's head swam as the stench of sweat and musk assaulted his senses. The gym rats and jockrats in the premium member's area all took notice of the newcomer, but continued their training.

Dex's eyes scanned the room frantically as he tried to find a way out, but there was nowhere to go. Ricky and Sandy both blocked the only exit. They were huge, hairy, sweaty gym rats. They towered over him and they were covered in a layer of sweat that shone in the lights of the gym. The gym was filled with the sound of grunting and squeaking.

Dex knew that he needed to escape, but was quickly caught by Gary.

"Let's have him test out the Rattenburg Treadwheel. I think it'll help him get with the program," said Ricky, instructing Gary to bring Dex over to the experimental rat contraption despite Dex's protests.

Ricky and Sandy watched as Gary dragged Dex into the wheel and strapped him to it. The treads slowly began to turn and Dex was pulled into a run. He found himself running at a constant pace on the track as the room slowly began to spin. Ricky and Sandy both stood there watching as Dex was forced to run as the wheel around him spun faster and faster.

As Dex's head spun around the room, his mind was filled with visions of him pumping iron and sweaty furry wererats. He felt his cock growing hard as he ran. He was constantly being sprayed with rat liquid rat musk as their collective workout stink was fanned into his face. His brain zoned out as the machine expedited his corruption.

Sandy giggled to herself as she saw Dex's cock bounce in his shorts as he ran. It wasn't as big as Ricky or Gary's but she nonetheless imagined all the ratty cum it could fill her with. She watched his body bulge with muscle as gray fur spread over his dark skin. The hypnotic gym music playing filled his brain with gym rat perceptions, crushing his IQ as he transformed with increasingly heavy steps.

"Mmm, I think he's almost ready," said Ricky as he stroked his cock and drooled at the new musky rat that was about to be born.

"Yeah, he smells really good," said Sandy as she sniffed the air.

Dex's mind was filled with images of the rat jocks, cocks, and even muscular ratgirls , and he couldn't help but fantasize about fucking them as he sexuality shifted from being strictly homo. He imagined his cock sliding into their hairy cunts and filling them with his musky cum as a fat rat cock pounded his furry ass. He squeaked as his face shifted and cracked into a pointed muzzle with big buckteeth. A fat long rat tail tore from his shorts as his legs and thighs swelled with muscle. His clothes were shredded, the fabric falling apart as he rapidly gained height. Sandy licked her lips as his body was slowly consumed by sweaty gray rat fur as he got pumped up and corrupted.

Ears as big as saucers he could hear the moans and squeaks of the gym rats nearby through the music and it only furthered his twisted thoughts as they dumbed down harder than the others. His brow jutted forward and heavy as his muzzle gave one final crack into completion. He squeaked and came all over the controls as the machine beeped and the treadwheel started to slow down. He was huffing and squeaking as it finally stopped and the three rats opened up the wheel for him to get out. He stumbled to the floor in front of them, squeaking again as his cock shot fat ribbons of yellow spunk at their clawed feet.

"Fuuuck. Me love a good workout," the big brutish gym rat that Dex was now rumbled.

"Might have gone overboard with this one, but I did say I was working the kinks out on the machine. Oh well, he'll make a great muscle jock for the gym," said Ricky with a smile.

The three wererats quickly escorted him to one of the empty wrestling mats.

"Not so hard to become one of us, is it, bro?" said Sandy as she stroked the big new rat's furry shoulders.

Dex could only grunt and squeak in response, his brain having been permanently dumbed down by the machine.

"Great. Now the four of us can get a nice stretch in together," said Ricky happily, "Gary help our new rat stretch his hole while I give Sandy here a good alpha rat breeding."

Gary's cock was already slick with precum and the slimy pre ran down his thick 12 inch length. "Sounds like a good idea, boss!" Gary said happily.

Gary lined his cock up with Dex's furry asshole and pushed into it, his thick meaty shaft stretching his hole open. Dex squeaked and moaned as his tail twitched and wiggled. His furry cock jumped and fired off musky shots of jizz onto the mat beneath him. Gary's balls slapped against Dex's ass as he pushed into it, and Dex's eyes rolled back in his head.

Ricky was quickly pinning down Sandy to her delight and pulled down her yoga pants to reveal her fat furry pussy. He hissed as he slid his 13 inch uncut rat cock into her swollen folds as she squeaked from being stretched open. Their musky musk wafted into the air, further polluting the environment with their corruption as Sandy's oily feminine musk mixed with the dominant sweat of Ricky and the gym. Her thick ass clapped and shook as she was pounded by Ricky.

Dex felt his ass being filled up by Gary's cock and he loved it. His mind was clouded with lust and he could only think about getting fucked. He squeaked as his hole was stretched, his thick ring squeezing around Gary's cock. He pushed his ass back against Gary, wanting to feel his cock deeper inside of him. Gary grunted and pushed in deeper, his thick shaft throbbing as he fucked Dex. His balls smacked against Dex's ass as he thrust into it, and he felt his cock getting harder.

Sandy's hairy pits were a sweaty musky paradise for Ricky, his rat nose picking up the primal musk of her armpits as he plowed her. He savored the feminine stink of her sweat as he drilled into her, his body hairy and musky from exertion. Their bodies slapped together in a heated display of animalistic lust, their tails flicking back and forth in the heat of passion. They were both lost in the moment, and all they could think about was getting off.

Ricky's ball sack slammed into Sandy's swollen hairy pussy mound as he bottomed out into her. He was huffing and grunting like a horny animal as he humped her, his sweaty furry body covering her and blending their scents.

He could feel his cock swelling in her, his knot locking in her and gushing musky seed into her. His long tongue wrapped around her throat in a domination move as his nuts emptied out into her. Sandy's pussy squeezed around him as her own body was overcome by pleasure. She shook and squeaked as he finished loading her womb with a thick congealed glob of cum that beaded up his urethra before depositing it into her depths and sealing his abundant seed in to ensure she turned into a gym rat breeder.

Gary was in heaven, his cock was throbbing as he fucked Dex's ass. The feeling of his hole tightening around him was driving him wild and he could feel his cock getting thicker as it got closer to cumming. His balls were aching, and he could feel his cum rising up through his shaft. He looked down at Dex's furry ass and watched it bobbing up and down on his cock. He leaned over Dex and grabbed his chest, feeling the hard muscle beneath the hair. He smelled so good and he couldn't get enough of his sweaty scent. His cock was twitching inside Dex, and he felt like he was going to burst.

Dex was squeaking and grunting like a horny rat as he got pumped full of jock rat cock. His own cock spurting jizz against the wrestling mat below and collecting into a slimy puddle. His tail was lashing as he was bred. The rat in him was taking over as his head got progressively foggier with lust as his muscles strained and flexed. He was like putty in Gary's hands and he didn't want the feelings to end.

Gary's arousal tipped over the edge, and he pushed deeper into Dex's hole. His thick cock was pulsing, and he soon was squeaking as his large balls forced out a hot musky payload of rat cum. He sprayed Dex's insides with his fully corrupted vermin cum as his new biology and outlook locked itself into place permanently.

"Fuck that was a good post workout stretch, wouldn't you say?" said Ricky to his three newest gym rats as he pulled out of Sandy.

The three chittered and looked up to Ricky with golden eyes as nodded eagerly and flexed for him.

"She didn't turn out to be an alpha like I'd hoped but she's gonna be great for adding more milk and sweat for the Sweatshakes. Plus I got a new brute rat to work security when needed. I made a good haul with this group," Ricky whispered to himself.

"You guys did great. You're now full fledged members of the Rattenburg Gym and have full access to our facilities. Be sure to spread the word, heheh," said the muscled alpha wererat to his fledgling gym members who eagerly affirmed their dedication to their new verminous inspiration.