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Professionally Muscled

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In which a fitness streamer finds a stepsister he didn't respect all that much might have learned more from him than he'd thought. Or hoped.

Sadi sighed as he unlocked the front door, stretching his arms up above his head the second that his backpack had been shrugged off his shoulders. The post-workout soreness he had from the first session back at the local gym persisted the entire way home, but Sadi didn't really mind, at least not at that point. Sure, when he had first started all those years ago it was nothing if not a problem, but in time he had made peace with the feeling—really, perhaps at this point he even enjoyed it.

Almost as much as he enjoyed finally hitting the bed after a long and hard workout. With nothing else to do that weekend, he was free to rest and recuperate as much as he wanted. Up until he had to head back to work, of course. First stop though, the kitchen; sure, he had brought a protein shake with him to the gym, but that didn't mean that he wasn't hungry after the jog home.

"I'm back," he called into the house as he made his way through to the kitchen, reaching up for one of the overhead cupboards and pulling one...no, two protein bars free. He blinked a few times as he glanced over the kitchen countertops towards the living room, brow furrowed slightly. Wasn't she usually on the couch this hour playing videogames or watching a movie or something...? She hadn't mentioned that she'd be out with friends or anything like that, at least not today. "Hello...?" he called again, glancing down the nearby hallway as he listened for any out of place noises...or loud music.

"...which, of course, was the point of..." Aria became audible in the exact moment she opened the basement door and just as quickly responded, "OH shit! Yooooo! Chat, check it out, my little step-brother is finally back from his stint doing this shit PROFESSIONALLY!" 

Aria stepped into the kitchen, already pointing a camera at Sadi, a very expensive one strapped to her wrist, though it wasn't alone, she had an earring mic pierced through her left ear, a mic pinned to her chest fluff, and a tablet in her other hand. 

That wasn't the surprising part, though. The surprising part was that she was huge. She'd always been tall and skinny by default, a source of frustration since they first met in their teen years as Sadi had to work out like crazy to catch up to a 6'3" couch potato but now she was almost as shredded as he was. 

Which was to say, extremely fucking shredded. "Ain't he cute?" she said into her devices anyway.

Sadi opened his mouth to speak, nothing other than a brief starting syllable coming from his open mouth as he looked from the camera to Aria then back at the camera...and then back to her. Was she wearing a muscle suit or something? No, there was no way—he'd seen them up close and personal multiple times, filing gag content for social media. This looked way, way too realistic, more realistic than anything Aria would have time with...wasn't that right?

This had to have been another one of her little pranks or jokes or something, right? She must have wanted his reaction or something, why else would she be filming it? Uncertain as to whether he should comment on the camera or comment on her, the professional bodybuilder, after a few moments of silence, finally decided to start with the former. "Um...who are you talking to...?"

"Oh, you'll find out~" she reached out with her tail wrapping it teasingly around his neck, before adding "we'll probably have a collab, see if I can bully the poor thing, so look forward to that everybody. But for now I gotta be actually responsible or something like that," she made herself sound as dismissive and sassy as possible before adding in a much more normal voice. "Okay Jerry, cut that and use it, going to ACTUALLY talk now."

Aria hit one button on her tablet and shook off the wrist camera next to the protein bars. "Sadiiiii! HEY. How ya been, hope I'm not TOO surprising," she teased him a bit, holding up an arm and flexing it at him, her bicep peaking to 20 inches with veins like steel straws. "I ended up using some of the workout stuff you left behind. And then started streaming that. And, well, y'know."

Sadi simply stared at her. The information hadn't gone over his head; rather, it had gone straight through it, in one ear and out the other as if there was no brain between them. None of the facts lined up in his head, so he could only stare at his stepsister with the same look that a confused student might express while staring at his math teacher's blackboard. Supposedly, all of these elements were supposed to line up yet no matter how long and how hard he thought about it, he just couldn't fit them together.

"...What?" he said, glancing down at her arm before, still bewildered, he reached out in order to give the arm she flexed a squeeze. Okay—it didn't feel like a muscle suit either, but...

"...Where'd you buy it?" he eventually asked, "the suit, I mean—like it doesn't feel like foam or padding or anything, it feels legit."

 "Uhhh..." Aria took the question at face value, albeit a -bit- confusing for a reunion, and picked at her tube top, prying it slightly off her extremely-tight chest before letting it snap back. "I think Adidas sent it to me? Or somebody? IDFK man I haven't gone clothes shopping in a while. People just send me stuff and tell me to wear it. But yeah they're usually legit. Stuff that has 'SILVER IOOOOONS' in the ad copy or whatever."

Aria "figured it out", "OH! You're so short and wide you need stuff don't you, then sure I can hook you up, but let's actually catch up, yeah? How hard is the circuit these days? I know they've got rules out the ass."

He blinked again. "Oh...n-no, I mean, I mean this," he replied again, giving her arm a few more squeezes. The muscle, obviously. "Like, I know I haven't been home for a while, but...this much? In like, that little time?" he asked, blinking a few more times. He continued to turn the possibility over in his head. In order for it to be even remotely possible, she would have had to start the day he headed out...and there was no way that was the case. Okay, but if it wasn't a suit or a joke, then surely it had to be something else.

"Are you on something?" he eventually asked, pursing his lips to show that he was serious. There was real concern in his voice; not judgement, not at all merely worry, concern over the possibility that she didn't really know what she may have been getting into. Additional questions tickled the back of his mind, particularly in regards to some of what she was saying to what was presumably a livestream? Or maybe just a clip taken for later? Either way, it was a little unnerving what did she mean by a collab?

"I just wanna make sure that everything's okay," he said after another pause, reaching up to rub his forehead, "it's just—you're completely different! I mean, it's not a bad thing, I'm just-"

"Oh yeah, like, half a dozen things. That's why I'm down to hook you up! Did you know that you got a shit ton of offers for bodybuilding products sent here? After I hit my second plateau I was like 'sure, might as well' and started accepting their offers on your behalf if it was something I could provide like test feedback or whatever." Aria casually admitted to multiple concurrent felonies. Compound felonies? 

"These days I get my own but they definitely helped! I dunno why you're so surprised, though, I mean like..." Aria grabbed Sadi's forearm, having to reach down quite a bit, and pressed her own thumb into the INCREDIBLY thick muscle between his network of veins. "We're foxes and you're this huge." 

Sadi might also have been underestimating how long it had been. Time flew for both of them when they were pursuing their passions, but it would definitely take more than one year to fit in all of what had happened to the both of them.

Sadi stared at her for a few moments, pursing his lips again as he glanced down at her own arm for a few moments before back up at Aria herself. With a sigh, he resigned himself to not worrying any further. Sure, she may have been lazy when he had left, but people changed and he had always hoped that it was a habit that she would eventually toss to the wind anyway. It wasn't his place to brush aside her success, right?

"...Alright," he said with a sigh, tucking any further malcontent in the back of his mind for the time being as he instead offered a sheepish smile. Sure, she may have been the lazier one, but he was the shyer one by far, as protective over his little stepsister as he may have been. "Let's start over," he said, pulling her into a hug instead. "Good to see you, huh?" he said, letting his smile grow as he pulled away again, "And you look good. Guess you just kinda spooked me a little bit, you know what I mean?" The smile became a good-natured grin, the initial apprehension in his head slowly ebbing away. "So, uh...was it really me forgetting to update my mailing address that made you give up the couch?"

: "Good to see you too!" Aria hugged back, both of them enjoying the sensation of getting to embrace somebody who felt more solid than playdoh, for a change. "I guess I am pretty intimidating now. Though you look like you can handle yourself," she winked at him, before ducking down to explain more quietly, "But nah, this started with all the weights you left behind... that, and getting drunk and lost."

Aria may have been a bit less lazy, but she was if anything more shameless. "The journey basically started when I got black out drunk, flopped my way into the basement gym, and couldn't figure out how to get out. I got so bored I drank 3 preworkouts and pumped iron, and when I woke up the next morning I was in a pile of puke and cum... but not actually feeling bad at all. I mean mentally. Physically I was sore AF but it beat a hangover. So after I finally escaped the basement I was curious enough to go back later in the week when my muscles were working again..."

"And holy shit, maybe I just suck at masturbation, but it was so much better. So whenever I got horny, I started going down and pumping iron until I collapsed. After a couple weeks I started cumming, and that's when I really decided to go for it," Sadi couldn't help but look at Aria's core, her supersized eight pack visible even through poofy white fur, she was huge all over, but the sheer definition on her abs and obliques showed just what she'd been doing to her core.

Sadi made a sound that straddled a space someplace between a snort, a cough, a sneeze, and a chuckle, multiple elements of confusion, disbelief, shock, and secrecy colliding together in a fascinating yet devastating trainwreck of a noise. The wide-eyed expression that subconsciously smeared itself all over his face wasn't much better. "R-really!" he said, blinking several times before looking over to the side. It was a beyond-suspicious expression; the only other explanation that could possibly be supplied for it was that he was simply shocked beyond any sort of sense...which was, to be fair, a reasonable conclusion. In reality, however, he was more than familiar with the "method" that she had uncovered; of course, being the protective older stepbrother he was, he hadn't told her about it in the slightest. He had always figured there was just something personal and weird about getting turned on by a good workout. Given his stint on the professional circuit, he had tried to simply think about it as a trade secret that helped supply him with his edge, but at this point he couldn't help but feel that the cat was going to leap from the bag rather quickly. For the sake of his own embarrassment, he could only hope that it didn't get far.

"Uhhhh, o-okayyyyy, you...really shouldn't—" He cut himself off for a moment, thinking about how best to handle this conversation. He hadn't prepared for his homecoming to shake out like this in the slightest. "...Were you just down there doing it? You haven't told anybody about this, have you?" Another pause. Slowly, Sadi glanced down to the tablet nearby, taking in a deep, sharp breath. "...And that feed or whatever is off, right?"

 "The feed's off -now- but it's a pretty open secret. I got banned the first couple times I tried streaming because of all the live cumming. BUT I got enough attention that making a proper go of it with, like, better camera angles and a team of editors worked really well when I tried again. It helps that I was WAY smaller when I got banned than I am now, so the premium me is objectively hotter than the me with the bootleg sex tapes," Aria said, still with entirely too little shame.

Only then did she parse how he was asking, "Awww. Don't tell me you're actually worried about your sleazy stepsister's shame?" Aria pressed her hands together in front of her, striking an approximation of a 'most muscular' pose that saw her traps, her back, her shoulders, and triceps all flare off her lean frame to a level that would be the envy of at least SOME of Sadi's male competitors. "I am really not afraid of people." She also had a shotgun, but that wasn't nearly as stylish.

The other fox's body shivered, a noticeable rippling flicker of musculature pressing through the thick cloth of his hoodie. Over and over again, he reminded himself that he was looking at his stepsister, despite the reflexive neurons that fired in his head a couple times merely from watching a display of musculature. Despite his usual tendencies, her words continued to worm their way back into his brain, prompting him to scratch at his head between his two large, twitching ears as a worried whine briefly escaped his throat. "No, it's not, I know you're not afraid of anyone..." Had she ever been afraid of anyone? Even as a teen, she'd said some absolutely insane shit to the people she gamed with online... "It's just hey, look, I'm happy for you, seriously," he reached out, grabbing hold of her shoulders as he kneaded them a few times with his fingers in what was supposed to be a placating, comforting motion, "it's just, are you sure this is the kind of thing that you wanna be doing? I know it feels good, but..."

There was a very strange amount of weight to that but, as if Sadi knew a little more than he was willing to let on. Considering who he was and what he did, there was a pretty reasonable chance that he was intimately familiar with the method that Aria had stumbled upon but if that was the case, then why shouldn't she get to use it, too?

Sadi sighed. "...L-listen, I'm just trying to look out for your future, okay? This stuff has...it just has the chance of following you around if you decide you want to do something else. You know what I mean?"

"Follow me to something else? Ehhh, I guess? But I'm still pretty lazy," the giant amazon said, somehow without irony, "I don't really want a 'real' job, so I'm mostly just throwing my giant wads of cash into investments. Diversified blah blah that tracks the economy for a minimum, and then the rest buying startups and making them work on long-term-health shit. By the time I'm forty it's either gonna be possible to look like this at forty, or I'll be back on the couch but with a personal chef who feeds me grapes. Win-win." 

Sadi was reminded that Aria was the kind of lazy who would put in any amount of work as a one time event to remove a recurrent amount of work permanently.

She was also too damn smart.

"If you're just worried everybody is going to know you do the same thing, don't, I've been advertising it as a Special Girl Privilege for marketing purposes and blah blah feminist baiting. I know the double standard where it's 'cool' if I can cum myself 20 times and 'humiliating' if you do it once."

Another sigh from the older fox. Life was easier, much easier, when he didn't get in Aria’s  way but that didn't mean that he had to be happy about it. It wasn't that he didn't trust that she had at least a portion of all of this figured out, it was more that he didn't trust her to consider or care about any potential consequences. For a few moments, he remained almost entirely still, as if uncertain whether he wanted to wade any further into this particular line of conversation… 

"...Are you sure you're going to be able to control the urges and everything like that, though?" he asked, refusing to elaborate, at least at first. The more she did it, the more she lifted, the bigger she got, the more intense it was all going to get. It was a rather nifty feedback loop, at least as far as placements and competition readiness got, but the supposed pommel on that double-edge sword was arguably even sharper than the intended blade. He leaned a little further inward. "Be honest." His eyes flicked towards the entrance to the basement. He had half a mind to walk down there right now and make sure that she hadn't made a total mess of all his equipment...

Aria opened her mouth to respond.

Tilted her head to the side.

And admitted to herself that okay, this time she actually didn't get it.

"Uhh... Not... sure what you mean." What urges? The urge to... work out harder? And get bigger as a result? And cum harder the next time? What exactly was the threat from an urge that kept improving indefinitely? If in five years she had graduated from 'huge and sexy' to 'literally history's strongest woman' through the power of cumming her brains out six hours a day... y'know, good?

Yes. Those urges exactly. Though, clearly, the two foxes were on very different wavelengths as to whether they were good things or not. What could go wrong? Aria was likely thinking. Everything, Sadi thought. His eyes flicked back and forth between her and the entrance to the gym a few times before, with a deep breath inwards, he pulled his hands off of her shoulders and began to make his way towards the door, flicking the stairway light back on before making his way down. He did what he could to steel himself for what he was almost certain, at this point, was going to be something resembling utter carnage; something at the very least similar to what he'd put the room through the first few rounds before he, at least presumably, put the brakes and some reigns on his proclivities and behaviors he at least liked to think that he had things under control, but who really knew.

Though, given the way his sister had been acting—not to mention the mind-boggling progress she had made—Sadi prepared himself for the very real possibility that he was going to descend into a room that had been subjected to so, so much worse.

Well. 

There were a lot more cameras.

The basement was now half studio as well as being a gym, plenty of equipment catching shots and mics from most angles, the fridge full of workout shakes with a stack of powerstrips next to it and some tablets on top of it.

Other than that it was... mostly normal. The equipment was clean, though some more of it had been nailed down, and Aria had left the weights on the squat rack... all 800 pounds of them. There were actually quite a few new machines. A rower. MULTIPLE bars from the ceiling that could have been for chinups but judging by the different camera angles facing them were probably each for a different workout. An actual -bucket- of wrist and ankle weights. An extremely expensive looking stair machine.

The gym was professional, and almost entirely improved.

Excluding how densely, constantly, it smelled like sex.

"...Oh."

Sadi came to a slow stop before even reaching the bottom stair. The room was barely recognizable; even before he realized that he'd barely be able to move before tripping over a camera or an accompanying wire, his eyes had focused on the machines...and the amount of weight that had been piled onto them. Okay, she was definitely taking all of this seriously, and there was definitely some sort of weirdness. A trait that, in that moment, was already starting to cause the bodybuilder's head to get a little fuzzy.

"You...r-really need to spray this place," was the first comment that he was actually able to give voice to. Granted, he would have rather commented on the various improvements, impressive as they were or on the fact that Aria had practically figured out how to make "showing off in the gym" into some sort of heavy industrialized operation. How many followers did she have, exactly? At this rate she was going to have way more in the way of sponsorships than him, assuming she didn't already.

But no; all of that was completely overwhelmed in the space of his mind by the unmistakable stench of cum. Sure, it was familiar, but the fact that his stepsister's own scent was making him noticeably throb was a level of strangeness and embarrassment that the other fox really didn't want to experience on his first day home. Things had already spiraled so far away from his expectations; he thought he'd walk in, see her playing games or something in the living room, give her a few hugs, and then attempt to talk past her game in order to figure out what she had been doing with her life all the time that they were apart (nothing). Instead, here he was, attempting to shroud twitching muscles and a swelling mast from his own sibling.

"How...o-often are you in here...?"

"Daily. I usually use rest days for cleaning and maintenance. Which sucks, but I don't really want the maid in the drug stash room," Aria joined him in coming down the stairs, her paw pads tapping gently on the steps as she glided down in two practiced steps. "And it's a lost cause, trust me. I make sure it's 'disinfected' but ever since I started buying Fem-T the pheromones never go away."

She took a deep breath, leaning back, pressing her palms against her rear as she stretched. "Honestly I kinda forgot about it." If she had thought about it more, she would have probably tried to sell it. The press of pheromones was intense, like the entire room was screaming 'fertile, needy, active woman'. Any straight man could enter this gym and experience a testosterone rush that got them their dream gains. 

No exception made for its one bisexual woman. 

And only possibly for its one man.

It was bad. He'd been doing so well. His go-to of deep breaths and easy thoughts weren't even working because each breath just made the sensation worse, the potent stench of an entire year of built up sex hormones drilling into his mind like a jackhammer every time he dared to breathe inwards. He wasn't even capable of hiding it at that point, his sweatpants tenting to a ridiculous degree as his breathing only became all the more erratic and sporadic, a mixture of a self-imposed struggle to breathe and the constant, more primal desire to give in to whatever was stirring around in his head at that point. It was insane to him that Aria wasn't picking on the smell the same way but then again, it was hers, and she'd probably grown used to it. It wasn't like either of them needed an excuse; this was just one hell of an on-ramp.

"I...n-need to work out for a bit," Sadi eventually said bluntly. Which was a ridiculous notion, considering he had done a full workout at his old gym for the sake of it before stopping by the house, but standing there at the base of the stairs in the old basement suddenly filled his muscles with fresh, unyielding vigor, as if he'd been resting for a whole week instead. He didn't even wait to get a go-ahead, doing everything he could to steady his breathing as he peeled his hoodie off of his upper body. The pump that he had gotten at the gym was still raging all over him, scrawled veins and rippling serrations making it clear why he was center-stage so often. The overhead lighting of the basement, likely selected specially in order to make the footage Aria shot all the more dramatic, only put into perspective just how unfathomably ripped the fox was. With that sort of setup, larger, more naturally-muscular species likely would have assumed that either of the two foxes were photoshopped, let alone the insane idea that there was somehow two of them.

"How...how high do these machines go...?"

"World record," Aria said casually. If it was something somebody could do, they could do it here. 

If it -wasn't- something somebody could do. Well... they still might.

"Yeah okay," Sadi replied as if he hadn't really heard the answer, or decided in the end that he didn't really care. "Spot me please..." This definitely sounded like autopilot. A weird state, perhaps, for the other fox to see her stepbrother in; while he had been taking his workouts seriously before he moved out, it was always the sort of thing that, for one reason or another, he insisted was best done on his own. Locking the door to his room when had gotten his first set of weights, sneaking out at absurd hours in order to go to the 24 hour gym downtown, buying the starter equipment for the basement gym and insisting that nobody came downstairs. Yeah, it was starting to make sense now. At least Aria had more wholly embraced what appeared to be their little common surprise.

Sadi took a seat on the bench of an incline press machine brand new, practically shining on account of Aria's constant cleaning jobs. No amount of chemicals she used were capable of masking the fact that she had came countless times on that very bench, but it didn't matter. With his cock stretching the band of his sweats to the point where most of the shaft's length was now clearly visible to the naked eye, he grit his teeth and set the machine to half of its total weight, several hundred pounds present for his warmup set. It was a ridiculous amount of weight for that exercise on its face, and the fact that he had already done a complete circuit earlier that day only made the selection all the more ludicrous. At that point, Sadi didn't care. His body knew what it wanted, and the deeper, more instinctual part of his brain was desperate for the very same thing.

The fox let out a deep, huffing moan, arching his back against the seat as drool dripped from his mouth and his rippling, viciously-detailed pectorals swelled in response to the smooth gliding resistance of the cable-driven machine. His sex swelled to an even more monstrous extent, threatening to snap his waistband entirely at that point unless it freed itself once and for all. The moan became a growl as he reached the top of the rep, the already-present veins spiraling across his chest now squirming angrily in the face of yet another workout. Anything in the way of burn or fatigue had been completely banished from his form by then, replaced instead with the need for pain and pleasure in equal measure as a result of the swirling pheromones. Judging by the slowly-growing dark patch on his grey sweats, the heady scent of a male in his prime was about to join his stepsister's scent.

The first rep was only the beginning. The amount of pressure that the machine was able to put out was clearly pleasurable, considering that Sadi began to grind out rep after rep as if each motion resulted in more desperation than the last. A heavy grunt shook his flaring, bulking arms and chest at the top of each rep, the weights sliding up and down several times in total before Sadi let them clang back into position in order to move the pin further down the stack as he chose to dial things up fifty pounds. With a heavy huff, he shoved upwards again, glaring straight in front of him as his swollen arms and heaving chest once again went to work, blowing past the prior seven reps and doubling them in no time as sweat began to pool in the crevasses and valleys of his well-honed form.

Despite all the caution and warning and seeming disapproval that Sadi had shown when he had first seen his sister, it was clear that these two particular apples had come from the same tree.[/i]

Something occurred to Aria. 

Sadi was hot.

She knew, objectively, that was true unless you were really REALLY obsessive about height. He was ultra-ripped, energetic, successful, loyal, etc. But he'd always been her miniature if ridiculously wide stepbrother. 

But just now Aria was realizing. Sadi was hot.

The cock creeping up to his abs was enormous, 11 inches at least. The veins across his body were powerful, pumping in time with his muscles. For the first time in a long time, she was torn.

She should keep spotting him, maintaining safety and blah blah even though that was the part of gym etiquette she had never bothered with for herself. She wanted to strap several hundred pounds to her legs, hop on the bar, and start doing full extension hanging leg raises until she blasted across the floor.

But she could, could take his tiny, tapered, perfectly proportioned fox snout and shove it right up her snatch, putting him to work doing the kind of thing so few were worthy of.

The older fox knew, in the back of his mind, that this was starting to get more and more fucked up. The front of his mind, for better or worse, didn't care. His cock was twitching, throbbing, ready to slip free of the elastic band that kept his full-ruler of a pole from drenching the bench with white ropes. Every inward breath of the scent made him want to lift harder, lift heavier, grind out the reps to the bitter end and increase the weight more and more. His eyes peeled away to Aria himself, and the fox's cock finally slipped free of its bounds as his arms extended to the apex of the rep as if they were moving air instead of metal.

Every smooth glide and clank of the weight stack drove a vision into his head like a hammer slamming railway spikes into the ground. Her. In here. Building that body up from scratch on nothing but lust and hedonism, sampling the things that had been erroneously sent here instead of to his new address. Lifting. Pumping. Cumming. Again, and again, and again, for no reason other than it just felt so. Damn. Good. Tracing those veins with her tongue. Fingering herself mid-flex. Grinning into the camera, knowing that thousands of people were out there doing the same.

He shouldn't have been thinking about her like that.

With a roar, he slammed out another rep, keeping his arms extended as they shook and shivered even more erratically than the veins that writhed like snakes beneath his tightly-stretched fur. The machine slammed back into neutral as the growling beast of a brother took several moments to compose himself, every inward breath only making it worse as his scent fully joined the mix, cum from his pumping shaft splattering upon the bench's fake leather and powdered black metal as he clenched his hands and watched the muscles ripple up and down his arms. Cords clapped against one-another, fighting for space on his engorged arms as needy drool continued to leak from his mouth, a notable transformation compared to the meek, polite, quiet man that he tended to be with family and polite company alike.

Eyes still locked in an intense, strangely-sexual glare, he turned his attention back to Aria, wordlessly dragging scented air in and out as if it were water in a desert. "...What next...?"

Silence Labs PATREON 54 favs
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POSTEDMay 10, 2026
ARCHIVEDMay 10, 2026