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It was the end of a long set, sweat dripping down River’s fur as they were breathing in deeply while setting the weights back on the rack where they got them from. Wearing a tank top and a light pair of shorts to workout in, they had slowly looked up from the rack to see the mirrors along the wall above them. Slowly bringing his arms up and looking at them, he was a bit dismayed even if it was probably a bit premature to think they’d have gotten bigger just from that single workout. But as time went on, their progress was getting less and less noticeable, as if they were hitting the peak that they could get to. As disheartening as it was, they knew they could trust both their friend and their coach, the owner of the Hyper Gym Oro to steer them in the right direction. After looking in the mirror a moment more, they slowly turned around to look at the much larger coach with a bit of a disheartened look. Just seeing how Oro was compared to them was a reminder of how far behind they were to where they wanted to be. River stood around five foot eight inches tall, and had a pretty strong looking body as far as anyone might think. Well defined abs and musculature, the mutt of a canine had a light brown fur over their chest and belly, giving way to a darker brown and black splotched mix on most of their body. Long black hair ended in some pink at the end of it, giving a nice complimenting contrast to the rest of their fur. A smaller tail just above their behind, they definitely looked like they worked out, even if they didn’t hold a candle to Oro in front of them. “You know, I think I’m just hitting a point where I’m not getting any bigger really… Haven’t seen much progress on my muscles…” Oro was a bit worried when he heard that, looking down just slightly at River while the canine’s height of six foot three inches made him just a bit taller than River was. Where he was definitely larger was in his muscles and body in general, very easily seen underneath the golden fur that covered most of his body. Him and a lot of the other people that came around the gym would put anyone like River to shame, his frame absolutely packed with muscle and then some. His pecs pushed out from his chest a large way, bulging shoulders and arms at his side while his somewhat slimmer abs and midsection were on display. Thick, tree trunk thighs and legs were completely visible, not having much clothes that could cover up his physique or size and ending up opting to just be naked all the time instead. This left his shaft and sack hanging out in the open as well, even soft showing just how large and thick it was while resting overtop the thick balls against the front of his thighs. “I think you’re still progressing ok. I can try and push you harder if you think you can take it though.” The words weren’t exactly what they wanted to hear, River was still in the mindset that even if they were to work harder, they might still be stuck where they were no matter how hard they pushed it. Either way, they knew their coach would know best, giving a slight nod as they spoke. “Yeah, I think I can do more. I’m not sure what will happen though. I think I’m gonna hit the locker room and head out for today though, I’m pretty sore.” They gave a slight smile as they said that, slowly going to turn around and head toward the locker room as they could already imagine themselves being built like Oro was, only fantasizing about being that size and more as they stepped into the locker room to wrap up the workout for the day. Just seeing how his friend seemed kind of down really got to the mutt while he watched River walk away. He wanted to reassure them it would just take some time and some more work, but they could see that if River lost the motivation they wouldn’t be making much progress. Standing for a moment and thinking, Oro did have a way he could help more directly and faster, but it wasn’t something he did often or really wanted to employ. Part of working out and building muscle was the journey to get there, knowing how to do things to maintain your build after you got to that point. And there was no telling if it would even work or take for River with how specific it was… Even just thinking about the process and what it entailed was pushing Oro in that direction either way. Knowing that it wouldn’t just help River but also himself, he could feel his length getting just a bit more plump as his arousal grew at the idea. Even though he was in his late fifties, Oro had an extremely high sex drive, and just the slightest bit of arousal as reminding him of just how full his balls were at the moment. It had been a bit since he came and unloaded, the pent up feeling pushing him even more into what he was thinking about. Just enough that he walked over toward the front desk of the gym, reaching underneath the counter to grab a bag of things before he also made his way toward the locker room. Already in the locker room and with their workout clothes off, River wasn’t looking toward the door and instead slowly arranging things in the locker. Putting the clothes inside a bag, they were in the process of just getting things stored in place before they were going to walk toward the showers when they heard the door behind them open. Not turning to look, too lost in thought as they were zipping up the gym bag with their workout clothes and other things to take home with them, they were just about to turn and head toward the showers when they suddenly felt a hand touch on their shoulder. Turning around to see who it was, River didn’t get a chance to react before they were suddenly slammed up against by Oro, letting out a loud grunt as the much larger bulk of the canine easily pushed their back right up against the lockers. Their head pinned in place by the thick, large pecs, the rest of that strong bulk had them stuck standing straight as they looked up toward their coach with a somewhat worried look. While they knew Oro had a tendency to really need to get off and get aggressive during those moments, Oro had never done something like this to them before, especially not this rough and fast. The look on the canine’s muzzle and face didn’t really make them worried at all, not looking aggressive or mean and mostly just forceful. Which Oro was definitely being, pushing more and more roughly as he flexed his muscles and used his bulk to keep the smaller mutt in place up against the lockers. It was even getting to the point where beads of pearly white milk was starting to leak out of his nipples as his strong pecs flexed more, keeping River’s head right where he needed it to be as he let out a slight huff. Already he could feel his arousal getting stronger, his shaft starting to swell and harden rather quickly as he moved his hips just right to slide his uncut tip closer and closer between River’s legs and under their sack. Knowing exactly what he was aiming for, his throbbing length pressed and rubbed over River’s rear entrance as his hands were working on something else. Putting their hands on the much larger canine did little to help them as they were stuck in place, letting out a low huff and grunt as River did try and push the bulk off of them to no avail. They were stuck in place, feeling that throbbing tip pressed up against their rear from the front while their head was trapped against the thick pecs. Some of that milk leaking out was already dripping onto their arms and sides, and overall the situation was doing nothing to stop their length from slowly getting hard and pressing up against Oro’s abs as they could barely focus on what Oro was actually doing otherwise. It wasn’t until they looked to the side and saw what looked like a shaker cup being put up to Oro’s leaky right pec that they saw it being filled with the milk dribbling from the thick nipples, mixing with whatever was already inside. “Oro…! What are you doing…?!” Words seeming to fall on deaf ears, Oro didn’t seem to be in the mood to explain himself as he kept slowly prodding his tip up against River’s ass ring with soft pushes forward with his hips. The length he had was massive, very thick and way more than River had ever taken before, but that didn’t stop him from prodding and pushing up against that hole to start working over it. He waited a few moments for enough milk to be gathered into that cup before he pulled it away from his pec, lifting his arms up while still pinning River with his pecs as he capped the cup and started to shake it quickly. Not wanting to have to explain exactly what he was doing, Oro just silently shook that cup while still pushing harder against that hole with each soft thrust up and against River. After a few moments and knowing it was fully mixed, he uncapped it as he brought his hands back down, holding that shaker cup just in front of River’s head as he looked inside. The mixture of the special protein powder and his own milk looked plenty mixed and frothy, the powder inside being a special family recipe that was supposed to only be used within the family. It contained special ingredients made from his own DNA, things responsible for just how easily he was able to build muscle and how naturally large he was able to get. Through some testing, he was able to find out that giving it to others along with a heavy dose of his seed resulted in an instant spurt of gains on whoever took it, some of it even somehow bouncing back on himself and adding to his own physique. This was exactly what River would want, even if they didn’t know it yet, and Oro couldn’t help but feel the arousal fueling his movements as well. That ring was starting to give way and spread open slightly as he kept working at it, slowly moving the tip of that shaker cup toward River’s lips as his other hand gripped the sides of his muzzle. “Drink.” His words were very plain, slightly huffy as he was still grinding his large tip against that hole as he squeezed on the sides of River’s cheeks, making sure that muzzle opened just enough for him to start pouring the milkshake in. Each soft thrust that came forth only made River grunt out louder as they swallowed down the mixture, being pushed and pressured by the weight of the hyper muscled canine in front of them only turning them on more. This was one of the first and only times they had been in such a forceful situation, unable to stop as their hole was being stretched more and more as their length throbbed and pulsed powerfully against the strong muscle in front of them. Those pecs easily kept them in place, feeling them flex and twitch with any movement of those arms while the sweet and strong taste of the mixture rolled over their tongue. As they swallowed it down though, they could feel an intense heat appearing with it, making them grunt louder and not just from the feeling of that tip slowly starting to push into them. It spread out from their belly, suddenly making their muscles feel on fire and their body twitch slightly as it filled them with a pleasure they had never known. Even as the cup was being turned more to give it to them, they couldn’t help but feel like what little amount they were getting to drink was not enough, their hands slowly reaching up to grab at those pecs and almost give them a squeeze to feel more of that milk spurt out onto them. It was obvious Oro liked it as well, letting out a deep huff before he thrusted forward hard. The feeling of such a tight hole stretching out around his tip was intense, pressing himself harder up against River while his length was still being pushed further inside. He could feel the bulge of those abs giving away to the large insertion up against him, moving his hips more to slip more of his shaft inside than just the tip as the deep grunts and huffs from River told him the mutt was enjoying it just as much as he was. The throbbing length up against him and the way River was groping at him only urged him to get rougher and more aggressive, finishing pouring the milkshake from that cup and dropping it on the ground before his hands went to either side on the lockers. Having a better anchor, he did another rough thrust in with a loud groan, shoving inch after inch of shaft into that stretched hole with wild abandon just to feel more of that tight warmth along his length and get in deeper. River moaned out loudly as that length went in, quickly and easily stretching their insides more and more while they felt it slip over and past their prostate getting deeper. It caused an immense feeling of pressure in them, only making the pleasure that much stronger as it felt like their prostate was being absolutely crushed by the size of the length going in them. Coupled with the heavy heat still spreading through their body, they had never felt more aroused ever, even as it felt like there was no way they could stop himself from holding anything in while their insides were being worked over so thoroughly. Their toes curled against the ground, legs being spread further apart for that large insertion as Oro seemed eager to get it most of the way in them. There were no words, just breathy huffs and moans as Oro’s shaft entered further, more and more pressure building as they could feel their body getting hotter by the second. Shaft pulsing and twitching up against the hard abs, they couldn’t take the pressure as their piss slowly dribbled out of their length, being forced out by that twitching length burrowing into their ass so forcefully. It wasn’t a bad feeling though, even letting out a slight moan from the sensation. With most of that thick, heavy shaft of his in River, and knowing that the potent milkshake would be coursing through them, Oro didn’t hold back as he slowly pulled back a bit with his hips. The slow huff that came from him was obvious, as well as the deep moans coming from River pinned between the locker and his bulk as he quickly shoved back in. He didn’t skip a beat, already starting to pull back out and getting into a steady rhythm of pumping roughly into that hole, keeping himself pressed tightly up against the mutt even though they could already feel that body twitching and reacting against him. Eyes wide as the thrusting began, that heavy heat that had spread through their body was only getting hotter, turning into a searing pleasure through their muscles as they could feel their system reacting to whatever they just drank. It started to turn into more than just heat, feeling involuntary twitching starting to appear across their entire body as their muscles felt like they were going into spasms, but not painful ones. It made their shaft harder, pulsing like mad and spurting out heavy amounts of precum from both their prostate being pressed down so hard and the pure pleasure as they could have sworn things were feeling tighter. It wasn’t that Oro was pushing against them more, and it wasn’t anything to do with them pushing back… It was a distinct sensation, as if the space between them was getting smaller, less available as it took a moment before they realized what was actually happening. Each small twitch in their muscles wasn’t just slight movement, but more than that. They could feel each slight change, each time one of their muscles got just a slight bit larger and bulkier as already the smallest amount felt like the largest change they had seen in weeks on their frame. Not staying slow or barely noticeable, it was hard to discern it at first compared to the heavy, rough thrusts being pushed up into them and their insides being stretched out for the large insertion. But as it drew on more, not even needing to see what was happening, the pleasure and arousal only skyrocketed as their muscles all at once were slowly swelling. Beyond the sounds of that thick, slick cock pistoning in and out of their rear and the loud slaps of being pressed up against each time, the slightest of noises of what sounded almost like rubber being rubbed over or something being stretched was heard. Like music to their ears, River just groaned and huffed from both the intense and sudden pounding they were getting and the feeling of their strength increasing. Their hands slowly roamed over the sides of the larger, more muscled mutt and pressed against him some, feeling like if they wanted to they could now try and even push Oro off themself. That was the last thing they wanted to do though, unsure if the hard thrusts in was the thing causing the constant stretching and swelling of his muscles or the milkshake, if not a combination of both. In any situation, they didn’t want any of this to stop, feeling their precum being shot out so strongly as they grunted up against those pecs deeply. The swelling sensation continued to grow stronger and stronger, just like their muscles were with each passing moment the rough fucking was continuing. Each thrust in felt like it was getting stronger than before, hearing a louder slap and rougher push in as Oro seemed to be getting more and more into the situation. More space between them was being created by the muscles expanding, pecs swelling out more and pushing Oro further away each time. River could feel how the shaft being pushed into them wasn’t getting in as deep as it was before, though that was quickly fixed as Oro changed his angle a bit more and made River moan even louder than before as it hit those deeper spots again. Though, Oro wasn’t going to last much longer. The extreme arousal as well as being pent up wasn’t going to allow him that courtesy, especially since as he had gotten older his orgasms had become quicker and more potent over time. Each new rough thrust upward made his balls slosh and tighten just a bit more, letting out louder grunts and moans of effort as he felt the canine swelling up against him. The definition of those muscles was getting easier to feel against him, only making things that much more arousing. He knew that things weren't over though, even as those muscles were getting larger it was only the first stage of the ordeal. With River now seeming close to twice their original size if not more as far as bulk, even if it was all completely covered underneath him pressing them against the locker, there was no way he was going to be able to hold back the next part of it. He was too needy, balls too full and ready to burst as his length was being squeezed so heavenly by the tight, stretched hole he was pushing into. Thrusts getting slower and rougher, his loud groans and grunts only getting stronger, a few more hard thrusts in Oro changed the angle of his hips and pushed in one last time. He felt his shaft getting in even deeper than before, swearing he could feel the slight bulging of those abs with how deep he was pushed in as he let out a loud, long moan and hit his peak. Balls clenching heavily, he could feel his length bulge out as his cum started to pour deep into River, now starting to feel that heavy pulsing heat backfiring into himself as well. River couldn't help it, the heavy sensation of hot spunk being dumped into them and filling his insides only increasing the pleasure as their own length erupted at the same time. Their seed splattered against the abs of Oro, the heavy heat that had spread through them suddenly only getting stronger as it resonated out from where they were feeling slight swelling with how much cum was being shot into them. It only made them huff and groan louder, now actively pressing up against Oro and even slightly challenging his strength. Even though they were both at their peak, it seemed like the changes had only suddenly spiked. Louder sounds of heavy stretching came through, muscle being pulled and strengthened as it got thicker and heavier. It was audible and extremely pleasurable, and not just on River's side. They could hear that the same was happening to Oro, watching and feeling those pecs swelling larger up against them and spreading further apart as the golden-furred mutt seemed to be getting wider by the second. And it wasn't the only thing getting wider about Oro at all. River grunted and almost screamed out as he felt that shaft getting larger inside them, spreading him out more as the flow of cum only got heavier with the explosive growth. Even as the bulk against them was getting larger and the shaft in them getting thicker, River didn't need to see to be able to feel that they weren't just gaining in muscle either. Each throb of their length caused it to swell, feeling the more powerful twitching and pulsing as they came heavier with each passing moment. They could feel more of Oro's abs against their length, hearing more loud splattering as their seed ended up hitting the ground while their balls filled out thicker and fatter. It was nearly impossible to keep track of what all was happening at once, all the pleasures and sensations just an overwhelming amount of pleasure surging through their body. Feeling the length getting larger up against him was hardly the thing Oro was focusing on as the pleasure was surging through his body as well. His legs were further apart, having to change his stance while his entire frame was getting wider than before. He could even feel how his abs were further away from River’s own, pecs pushing out more and more and creating more space between him and the mutt still being filled by his seed. More and more milk streamed out of his pecs as the growth continued, even slightly hearing the sloshing of the milk inside from just how big they were getting. The soft rubs from River’s hands on the sides of them made him almost squirm, becoming more sensitive to the touch the greater they swelled. As time drew on, the sensation was starting to go away slowly, the sounds of the stretching muscle and sinew only getting softer as everything was finally starting to calm down after the extreme growth brought on by the rough fucking and the special milkshake. The last of his seed flowing into that stretched hole, Oro was slow to start to pull back with his hips, hearing the soft grunts and huffs of both River and himself as it took a bit of work to slip each thick inch out of that used ring. Soon, with a soft pop and a loud splatter of cum coming out after, Oro’s tip finally came free as he groaned softly and started to take a step back from the other mutt. Finally feeling the release of pressure from not just that immense shaft in them but the pressure of those thick pecs keeping them pinned, River was finally able to lean away from the lockers and look down at themself. Legs shaking and gaped hole still leaking out fresh spunk onto the floor, they couldn’t help but gasp as they looked down at their body. They had felt what was happening, but this was the first time actually seeing the result, almost completely taken aback by what they were seeing. Looking down toward their full, heavy pecs, they were at least three times the size of before, heavy and pressing out as the strong musculature below them was nothing to scoff at. As if they had just gone forward in time after years of working out, their rock hard abs were so well defined they could see their sweat dripping down each of the crevices between. Arms and shoulders thick and broad, reaching over to run a hand over their upper arm only made them realize they could put most of the normal body builders to shame, as well as feeling just how strong and powerful the muscle was underneath. Between their legs, their shaft was still rock hard, leaking the last of their load as the length could almost be mistaken for a third leg, much much bigger than before with balls just as heavy and full to match. Their legs hadn’t missed out either, calves and thighs extremely thick and looking like they could easily crush a watermelon between them. “Holy shit… How did this happen? Whoa…” Oro heard those words and the second River’s eyes went back to him, already looking down at his body and noticing just how much wider he was than before. His hands were slowly moving across his pecs, feeling like they could have been a steady shelf with just how far they pushed out from his body, still slowly dribbling milk from just the slightest of touches. Broader shoulders made for a more intimidating look, his entire width easily that of two of River standing side by side, if not more. Just like everything else, his shaft and balls had also gained that with, now showing just why River was feeling that much pressure with it inside them and why their hole was still slightly gaped open and leaking onto the floor. Thighs and legs had gone from tree trunks to more, the muscle definition only getting stronger and more noticeable as well. While he was more used to the sensation and the growth, it still did feel a bit awkward at first with his wider stance, but Oro was quickly used to it again as he gave River a smile. “Special protein shake made with my DNA, and my cum added to it. A bit of a shortcut, but you seemed like you could use it. I just didn’t want you to complain and was pretty horny so…” His words somewhat trailed off as he said that with a smirk, now feeling quite a bit better even if he could already tell his balls were refilling at an accelerated pace compared to before. River chuckled slightly at that, still slightly panting and huffing from the ordeal they had just been through. While their hole was still quite a bit sore, they weren’t sure that was so bad of a trade off from what they got from it. “You could have just said something and asked. I would have been down.” They seemed rather non-chalant about the rough pounding they just received, and instead were more interested in their new body. Legs still slightly wobbly, even with the exhaustion they felt like it was much easier to move around, things feeling even more simple than before. Though, as they had slowly turned around to look toward their locker, they found they were already putting more effort into each movement than they needed to. They had to do a bit of correcting, turning a bit too far before turning back slightly and slowly with a blush plastered across their muzzle while reaching into their locker for a drink of water. Seeing that pretty open hole when River turned around, Oro kind of chuckled sheepishly as he saw River getting the bottle to take a drink from. “I know, but I wanted to get it done. I was excited.” He truly didn’t mean anything bad by it, and was just now reflecting how it could have seemed a bit mean. Either way, he was happy that River was happy, and not mad at him. Though, he did feel a bit guilty with just how much he left River’s hole stretched open, even if he knew the mutt was quite good at recovering in most other ways. Grabbing a towel out from their locker, River was quick to move it back behind and clean up their rear, swiping away some of the dripping seed and then just putting the towel back into their bag. Of course, when they reached for their clothes to get dressed, they paused and realized that the clothes probably wouldn’t fit anymore. With a sheepish chuckle, they slowly turned back around and looked toward Oro. “I guess those clothes won’t fit anymore… Or really any…” With a quick nod and a slight smile, Oro responded with a slight chuckle of his own. “Yeah, I don’t think you need to worry about that now. Just like me you’ll probably need to just go naked. Don’t worry, no one will think anything of it with the way you look.” Oro even gave a wink as he said that, a slight chuckle on the end of those words as he slowly stepped to the other side of the locker room. Moving to open his own locker, he had quickly reached in to grab his own bag, already putting the strap over his shoulder and feeling it was a little too tight now. He had to take a moment to loosen the strap some and give it more room with his enlarged shoulder now. River was quick to grab their own bag as well, taking a drink of water again before slowly putting the bottle into the bag and getting it zipped up. They also had to get the strap and adjust it, putting it over their shoulder before they started to walk toward the locker room door with Oro. It was a bit odd to be leaving the locker room without any clothes on, feeling just how breezy it was against their shaft and sack… They were also a bit apprehensive about just going around in general without clothes, but having seen Oro do it so many times, they had enough confidence to walk out the door with Oro stepping out just behind them. There were definitely a few eyes on them as they made their way across the gym floor, River giving some sheepish waves toward this person and that person that they had recognized before around the gym. They were definitely checking out their body, eyes lingering a bit longer than they were used to, though it felt good to them. It almost gave them a bit of pride to show off their naked body in public, knowing that people were looking long enough for that reason. As the door outside was slowly approaching and they were moving past the main desk, noticing a new employee had come in to replace Oro there, River was suddenly feeling a bit of that same heat again… It almost made them stop in their tracks, but they still just continued walking either way. As their eyes drifted to their side to see Oro right next to them, they were approaching the double door heading out of the gym as they noticed the larger, more buff mutt looking a bit more uncomfortable just like them. Almost as if it was timed on purpose, both of them suddenly stopped just before the doorway, letting out slight huffs and grunts as both of their pecs suddenly surged out with more growth. River felt it strongly, though not nearly as strong as Oro as his own were bulging out even more than before. Getting thicker and heavier, filled with more milk than before, in their slight stop between the doors, there was suddenly no more space between them. Pecs pushed up against each other's side, they each felt the other side of their pecs getting wedged into the doorframe, getting stuck in place as their thick muscles swelled slightly larger from the sudden aftershock of pec growth. Milk streamed out of both of their chests, dripping down their pecs and landing on the floor with wet splatters as they were both quickly getting hard, stuck while the pressure from each other and the doorframe was only causing them more pleasure on their sensitive chests. Both were blushing deeply, hearing some slight murmurs behind them as some of the gym goers had stepped in to see what all the noise was. There were even a few chuckles seeing the situation in the hushed whispers. After just a moment, the growth had subsided, but left them no more unstuck. Looking toward each other in a deep blush, they both chuckled a bit sheepishly at the situation they found themselves in, stuck in a doorframe from just their chests being too heavy and filled. Reaching toward each other, they silently figured with just a bit of squeezing, they might be able to lower the size of their pecs enough by letting out enough milk to get free. And after just a moment, it worked like a charm as they were soon through the doorway and standing facing each other with soft huffs. “This is gonna keep happening for a while,” Oro chimed in. “I’m sure getting around in my apartment is going to be just as fun then,” River replied with a slight chuckle.