Growth Spurt

Story by placeholderworld on SoFurry

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#2 of One Shots

Trevor has always wanted to be strong and muscular, but has never been able to gain weight. Maybe today will be different?

Here's another one shot like I promised! Got it done quicker than I thought though, lmao. It's definitely kinkier than my last so read the tags if you aren't sure if you'll like this one or not.


As Trevor walked to his gym, he could already tell that today was going to be a good day. His last college class got cancelled due to sickness, so he had a whole extra 3 hours to work out. Plus, he could finally try out that new protein shake his friends recommended to him. Apparently it's some super professional grade stuff, the kind that professional bodybuilders use. Maybe he'll finally be able to grow muscles for once.

As a bull, Trevor has always been expected to be some giant gymrat beast, with arms bigger than people's heads and a chest that could crush a can in between them. However, Trevor was almost the exact opposite. Standing at an average 5'8", the bull had almost no muscle definition on him at all. His chest was completely flat against his torso, his arms and legs resembling furry toothpicks, and don't even think about abs. Trevor has been going to the gym for about a year now, and despite all his hard work, he's got nothing to show for it.

However, he refused to give up. He was certain that one day, people would look at him and see the giant he was destined to be.

Trevor walked into the gym, absent-mindedly reaching up and tapping the top of the metal doorframe, as he looked around the gym. It was mostly empty, save for a few older looking people. Trevor guessed that people probably didn't work out at this time of day, it was in the middle of the work day.

Trevor didn't care, it just meant more free equipment he didn't have to wait for. He walked to the locker room towards the back and started to get changed. He removed his t-shirt, jeans, and shoes, leaving only his boxers on. He soon pulled out the jock strap from his bag, and quickly switched into it. Out of his entire body, he was most ashamed of his dick. It was a meager 4'½", and he didn't even have the thickness to make it bearable. He soon changed into his baggy workout shirt, sneakers, and basketball shorts, the clothes all obviously a size or two too big for him.

He grabbed the special bottle his friends gave him from his bag, before locking the locker and walking out to the main gym, the protein shake sloshing around inside. Today was chest day, he wanted to actually be able to see his chest sticking out from his body. He walked over to the bench, and grabbed two 5 pound dumbbells off the rack. Sadly, despite all his work he's never been able to go over 10 pounds in each hand without hurting himself. He started his lifts, raising the two green dumbbells over his chest, and then back down. By 5 reps he was starting to sweat, by 10 he was starting to slow down, his arms starting to strain. By 20 his set was down, and with a gasp he dropped the weights at his sides, taking deep breaths. He got up, his back already slick with sweat, and looked around the room. Luckily, no one seemed to be paying attention to him, watching him struggle in the back.

He reached down to the bottle at his foot, and uncapped it. As he brought it to his lips, he noticed his arms were shaking, and he cursed himself out mentally. Damn it, why couldn't he just be a little stronger? It was literally only 10 pounds, how could that be so hard for him? He hated his stupidly weak body, his seemingly inability to grow any sort of muscle, and his lack of any room presence. As he brought the drink to his lips, he wished he could be the biggest person in the room.

As soon as the shake hit his lips Trevor knew it was going to be good. It was vanilla flavored, and yet, the sweet flavoring was subtle, barely noticeable. What did catch the bull's attention was the strange salty taste of the drink, undercutting every drop of the shake. He greedily chugged some of the drink, before setting it down; he didn't want to drink it all at once of course. As he set it down, he noticed his arms had stopped shaking. He flexed his arm, already feeling a bit more power in them than before. Huh, maybe he really is gaining some muscle after all. He grabbed both dumbbells, laid back down, and began a new set.

This time, something was different. With every lift, the task actually seemed to get easier. This time, he got to 20 reps with little more than a sweat. He looked at his arms in awe, before walking over to the dumbbell rack, replacing his 5 pounds with 10 pounds. He did another rep with them, his arms at first straining but by the time the set was over they were pretty simple as well. He was dumbfounded, just a week ago these weights made his entire chest sore, but now he was lifting them like they were nothing. He set the weights down, took another swig of the protein shake, and walked over to the wall of mirrors. He didn't seem all that different, until he decides to flex. Before, whenever he flexed, his arms barely changed. Now his arms actually looked like they had some muscle on them. How on earth could his arms have changed so quickly, he wondered. He soon pulled the neck of his shirt open and looked at his chest, and nearly cried out in joy. His chest sat about an inch off of his torso. He actually had pecs!

Excited at this new prospect of pecs, he ran over to the machine fly, giddy with excitement. Before, he had struggled using the machine, and could barely finish a single set on it. Now, as he started his set, he could feel how easily the machine moved when he pushed on it. After a few pushes, he raised the resistance, and went back to it. He was never able to beat this level of resistance before today, but now he felt like he was barely even straining against the machine. He looked at his arms in amazement as he pushed, watching them grow with each push. He didn't notice it at first, but as his arm pushed against the pad, it physically inflated. He watched his arms as they actually packed on more and more muscle before his very eyes. Excited, he finished his set and moved on to the next piece of equipment, exercising harder than he ever had before, making sure to watch his body inflate as he worked. He spent over an hour just working on different pieces of equipment, watching himself grow to sizes he never would have expected. When he walked in through that gym door, he was barely strong enough to lift a 10 pound dumbbell, but now? He had the arms and chest of someone who actually worked out, maybe not gym rat levels, but certainly close, and the rest of his body was quickly catching up.

While his arms and chest were growing at very steady rates, that's because he was focusing on them. The rest of his body, however, was forced to catch up with repeated fast growths. His first swell hit while on the machine fly, and the feeling of what was to come would be one Trevor would remember for the rest of his life.

An intense pressure started to build up in Trevor's gut, back, and legs, and he looked down to see what was happening. The muscles began to spasm, before suddenly growing twice their size in the span of a couple seconds. Trevor gasped loudly, earning the bull a few looks as he sheepishly smiled and diverted their attention to the suddenly massive thighs he was sporting. And they weren't all that had grown, He could already feel that his feet were too big in his shoes, tennis shoes squeezing down on his toes. He felt his stomach through his shirt, which used to be baggy, but was now tight on his body, showing off his immense rack, and he couldn't believe his fingers. He had abs! Real, honest to god abs, an entire 8 pack even! He felt up and down, fingers exploring every bump and crevice on his new stomach. He had to feel more, and he felt his hand dive beneath his shirt, to make sure he wasn't hallucinating. He was surprised when he found coarse, dark hair along his stomach, his body hair growing much longer on his stomach, surpassing his short fur. He had no idea how he had suddenly grown body hair on his stomach when before he was mostly clean shaven, but he had always found body hair hot, so he certainly wasn't complaining.

Trevor was going wild at his own micro self worship session in the middle of the gym, he needed to be able to see it for real. He looked around at the few other gym goers, making sure none of them were paying attention to him, before finally taking off his own shirt to look at himself in the mirror. Trevor felt his cock stiffen in his pants at just the sight of his giant body in the mirror. His chest, which didn't even exist before he entered the gym, looked like two giant, hairy boulders on his body. His nipples had grown too, surprisingly, looking about an inch think now. Next to his pecs rested his mammoth arms, already ginormous, and they weren't even flexed. He raised his arm up and flexed, softly suppressing a moan as he watched the bicep balloon upwards, nearly the size of his head. Down under his pecs sat a clean line of abs, 6 in total, all covered in wonderfully furry body hair, almost looking like a second set of fur. He continued downward to his legs, his thighs filling the formerly baggy shorts to the brim, and his calves so toned they looked like they could crush watermelons. He looked like he really belonged in the gym, like building muscle was his life goal. Trevor thought back to his friends and how shocked they'd be when he showed off his new body to them. However, despite his satisfaction, his body wasn't done growing yet, not at all.

As he stood there, admiring himself, he felt another swell surge throughout his body, and immediately heard the sound of clothes tearing. He looked down at his leg, and noticed his thigh starting to spill out the sides. "Ah, shit." he muttered to himself, holding onto the rip and looking around to see if anyone saw him. An elephant from across the room was looking at him quizzically. He blushed and ran into the locker room, grabbing his shake along the way.

He soon quickly looked down at his leg to assess the damage, and suddenly felt another surge, hearing more rips, and being washed with feelings of bliss. He attempted to walk over to the bench, but noticed his feet had busted out of his shoes, his feet large and muscular, covered in hair. He groaned, and stumbled to the bench, ripping off the remaining scraps of plastic and cloth around his shoes, and he began to try and free himself from the tightening space of his shorts. He only managed to undo the button before another swell hit, causing the tear to spread all the way up his thigh, freeing the meaty muscle. He looked down at his shorts in a panic, confused as to why he was growing so much and was finally starting to see the downsides, when he noticed his bulge. The pants where his crotch sat were extremely overstretched, holding a sack about the size of a bean bag chair. He was stunned, was that....his own dick?

He soon reached down to touch the sack, hypnotized by the size. The moment his hand went to rest on the bulge, a swell hit, more intense than before, and the last seems of his shorts exploded, sending red mesh scattering across the room, leaving Trevor in only his tiny jockstrap. He reached his hand down again, watching the pole strain against the overly stretchy fabric, the base of his giant cock visible as the jock could never contain all of the beast. Veins thicker than some of his fingers traced up and down his cock, which was now at least a foot long and maybe even half a foot wide. He wanted to see the entire thing; he needed to see it. He reached down to the waistband, grabbed it firmly, and pulled on it. In a second, the elastic snapped, and he ripped away the rest of the cloth, his now foot and a half long cock rising up and slapping against his washboard abs, leaving a rope of pre to connect to his aching cock. He moaned openly at the new feeling of freedom, as he lifted his arms above his head, letting himself stretch out, riding out his next growth, making his cock grow a full 5 inches farther. It brushed it's leaking head underneath the bull's now engorged pecs, causing him to moan. They were really sensitive now, which he wasn't used to. With his chest so small in the past, his chest and nipples were never very sensitive before, but now just brushing up against the underside caused him to moan openly, his head leaking like a broken pipe.

He looked down at the half empty bottle of protein shake at his side. Why did he grab this on his way in here? He was confused by his fixation on the liquid, but knew he wanted to drink it. He needed to finish it, to taste the flavor over his tongue again. He grabbed the bottle, ripped off the cap, and immediately started chugging the liquid, not even caring about the taste or texture. He guzzled the bottle, throwing it down as soon as it was empty, his body already swelling once again. His pecs were now at least a foot off of his chest, leaving a deep, hairy cleavage between them. His thighs were like giant oak trees, barely carrying his body. He felt his cock lurch again, and it raised right up into his cleavage. He was immediately stunned by the feeling, his overly sensitive cock wedged right in between his equally sensitive pecs, rubbing with every breath he takes. The amount of pre he was generating was acting like a generous lube, making the experience even more pleasant.

Trevor knew that this was going to end messy, and lucky for him, there were showers just ahead. He pried his cock free of his pecs, moaning and shooting some spurts of pre across the locker room, before slowly making his way to the showers.


Trevor sat down on the tile with more weight than he had ever had in his life. There was no way with all the added weight that he was going to stand for this. He felt the warm water cascade down his muscles, feeling up more of his body than ever before. Despite this, the water did nothing to remove the smell of sweat and cum from the bull, much to his delight.

He laid back against the tiled wall, getting comfortable, before he started to rub his pecs. He was surprised just how sensitive they were now that they were so large. As he rubbed closer to his nipples, the pleasure only grew. Eventually, he grabbed the two nubs, both giant in size at this point, filling his hands, and he openly moaned, his hands pumping them on instinct. His nipples felt especially wet in the water, and he continued to play with them, rubbing the tips, pinching and twisting them. He opened his eyes to look down at them, and was shocked to discover the reason they were so wet wasn't due to the water, but the fact that he was actively lactating! Milk was flowing freely from his thick nipples, sometimes spurting when he squeezed them. Just the thought of his nipples being milked as such filled him with lust, and he continued his assault on them, his eyes wide open, determined to watch every second. He watched as his nipples squirted in thin streams as he pulled the nipples taught, before he pumped them. He brought one hand to his face, and tasted the milk, the creamy liquid exciting him further. He brought a finger up to the tip of his nipple, feeling the hole where the milk streamed from. He pushed on it, forcing the milk to flow past the finger as he felt the entrance. It didn't give in, but just that was enough to cause the man to moo with delight. He grabbed his other pec forcefully and squeezed, forcing milk out of his chest, when another swell finally hit. He felt his pec force his hand open more as the streams of milk got more intense, his body aching as it grew, painful but also delightful.

After the growth, he looked down at his leaking cock, and grabbed it. It was at least 2 feet in length now, more than he could've ever thought possible. He brought the cock up to his chest, and rubbed it in between them, teasing the cock. He moaned at the double stimulus, before pushing it deeper into the cleft. He pushed it as far as it would go, the head about halfway up the pecs, groaning the whole time. He sat there, enjoying the feeling of something so big in between his sensitive pecs, before he grabbed the two mounds, and began to pump. At first, he only moved his chest, rubbing it over his sensitive cock head and shaft, but his instinct kicked in and his hips joined in, thoroughly fucking his chest. His movements brought on another swell, forcing his cock farther up his chest, exposing more to the pecfuck. His pre lubricated the entire space, making the underside of his pecs slick and drippy. He looked down at his pecs, and noticed his cock head was just peeking out of the top of his pecs, dripping precum like there's no tomorrow. The sight of it drove him wild, and he ducked his head down to lick at it, lapping up the salty pre, only barely diluted by the flowing water. He moaned as he felt his tongue play with his own foreskin, his pecs sliding up and down his shaft. His hands groped his nipples again, making them leak once again, adding even more liquids to the mix. Trevor was a mess, covered in his own fluids, only for them to be washed away by the water, and then replaced once again.

The workout he was getting just from fucking his own pecs was excelerating the rate of his growths, making them near constant. In only a few seconds his cock had grown enough that he could slobber over the head without even bending over to it. His hunger was getting too strong, as he watched his cock bob, pleasured so thoroughly by his pecs, and he took his own cock into his mouth, swallowing it first try. His cock was so thick at this point that his jaw felt like it would unhinge, but he still took the pole in stride, his own pre pouring down his throat. Inexperienced, he couldn't deepthroat his cock, but he certainly was able to get it to the back of his throat, gagging a few times, each time splashes of pre flying from his lips, splattering the floor.

Trevor had continued to grow the entire time, so much so that his head, while sitting, was grazing the ceiling. His cock was about 6 feet long, his pecs the size of small cars, his thighs looking thicker than oak tree stumps. His nipples were longer than some men's cocks, and sprayed more than most men too. He was in bliss, his hips bucking hard to make his pecs ripple like water balloons, so filled with milk they moved more like breasts than muscular pecs. His own cock felt harder than steel, and ached with need. He was close, and he was going to ride it out every step of the way.

As his mouth slobbered all over his pole, his tits moving up and down the pull, working it masterfully, he finally felt it coming. He was so horny he felt he was going mad, but he didn't care. He needed this more than anything else in the world. He felt his mammoth balls tense up, and a pressure flow from the base all the way to the tip, before the dam broke. The first gush was so intense it immediately flooded his mouth, throwing his head off in the process. The thick rope made him choke for a moment, before he could finally swallow it. As he came, his pecs quivered and came as well, shooting their most forceful blast of milk yet, coating the opposing wall in their sweet nectar. The rest of that rope flew onto his pecs before he shot again, causing him to cry out in pleasure, the cum hitting the ceiling so forcefully it caused it to crack. He continued to rub his pecs over the shaft, licking at the exploding head as he did so, extending the orgasm. In under a single minute, the entire floor of the showers was covered in a few inches of semen, and his load wasn't near over. He shot for nearly 5 minutes, every second just as good as the last. Cum had flowed out into the hallway, flooding the locker room and leaving him in a puddle of cum and milk that stood about two feet tall. He sat there, covered in his own slurry of juices, fur and body hair coated white, as his cock and nipples dripped the last of their loads. His hands rested on his legs, tired, as he panted, trying to get his breath back. The smell of sex was so potent in the room that if he didn't love it he would be gagging, and even then it was a bit intense.

The afterglow was one of the most intense feelings of calm Trevor had ever felt, but he knew he could still go more. His balls churned, making even more cum for him to spray, and his cock had already begun getting hard again. He heard the locker room door open, and he knew his day wasn't over, and he was gonna make the most of it.