Bulking

Story by KiingDariius on SoFurry

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#4 of Commissions

This is another story commission I did for a user who's galleries I don't know the links to. Sorry y'all. This one's about their shortstack rat, RJ, growing into a massive hulking brute and exerting his newfound strength on his football coach. Also, if you're interested in a commission then keep an eye out. I'll open sometime this week!Posted using PostyBirb


?Dante crossed his arms and leaned back against the goalposts, watching his team while they ran agility drills. The lion was the head coach of the university's football team. They had a reputation for playing 'big ball'; Using the sheer size of their players to guarantee positive yards.

There was just one issue with the team; RJ. The green haired rat stood out like a sore thumb. Not only for the fact that he was twice as agile as any of the other players but for the fact that he was small. Not only was he the smallest player on the team, the next smallest player held at least 8 inches on him and weighed in at 100 pounds more. For a team that played their biggest players, that was an issue. If you had asked Dante's opinion he would tell you it was a miracle RJ hadn't been injured during practice. The coaches saw his size as a liability, and often wouldn't let the rat play in their league games. Today, that was going to change.

The weekend prior, at the gym, Dante and a kangaroo had gotten to talking. He didn't catch the marsupial's name, but they'd been talking about their pre-gym days. "Yeah! I was a real runt before the gym!" the kangaroo laughed "Me too. At one point in my teens, I hardly weighed a buck fifty at six-foot!" "You think that's small? Check this out." When the roo pulled out an old picture Dante couldn't believe his eyes! He'd been a runt! A genuine four-foot runt. And now he was bordering on seven feet tall. The roo had given him a bottle of his pre-workout, claiming the unknown substance was his key to success. Dante couldn't believe it. This unlabeled bottle? The lion had asked how much, but the roo gave it to him free of charge! He made a mental note to pay the roo back next time they met.

Snapping back to reality Dante glanced at his watch. Just half past four. The practice was over for the day. He gave a loud whistle and got his team to huddle up, leaving it to the other coaches to comment on improvements and weaknesses. After they'd wrapped everything up and began to head for the benches Dante put his plan into action.

"RJ! Wait a minute. I need to talk to you."

The rat's ears perked, and he turned around, jogging back over to his coach. The rat had to look up to meet his coach's gaze. Something he always felt a bit insecure about. Dante was easily twice his weight in muscle and had the intimidation factor of a big cat going for him. Uneasiness began to build in the pit of his stomach. His mind began to think up all kinds of worst case scenarios. Was he underperforming? Was he about to get cut from the team? RJ steeled his nerves. Surely he was overreacting.

"Yeah? What's up coach?"

Dante crossed his arms and stood silent for a moment. In his head, he was contemplating how to go about his plan. He saw that RJ was getting visibly nervous, so he took a chance and went with what came to him naturally.

"I wanted to talk about you and your role on the team..." he trailed off as he fumbled for the right wording. As if he knew what the rat was thinking, Dante quickly reassured him. "You're not being cut. So don't worry about that. It's just...you know we're a big team. And you're well aware the other coaches and I are afraid to play you because we feel it's a liability. It's a damn shame because you can actually move, and have more brains than the rest of the team combined."

Dante looked relieved upon hearing he wasn't going to get cut, so then what was the issue? Was he just trying to make him feel better?

"That being said, I think I've found out a way for you to put on some bulk. You see, I was talking to this guy at the gym. He gave me this." The coach crouched down, sifting through his bag some until he produced an opaque shaker bottle.

RJ was visibly confused. "But coach, you know I've been using supplements! I've already got like, ten different brands back home!" He was telling the truth. While he was undoubtedly the runt of the team, RJ definitely had muscle on his frame, and he worked hard to build himself up to this point. Dante sighed as he stood up straight, holding the bottle out to RJ. "You think so. But I'm telling you this stuff is something else. Trust me when I say this guy was a total runt too. In fact, look at this!" Dante pulled out his phone and pulled up a picture of a young kangaroo. Key features that stood out was the unique birthmark under his eye. Dante grinned at the rat's visibly confused expression. "Now look at this..." the lion swiped right, showing the rat an image of an absolutely ripped kangaroo. Unlike the small runt that was just on the screen, this kangaroo was bursting at the seams with muscle. He seemed a whole foot taller and had to have gained at least a hundred pounds of muscle alone.

"Holy shit. No way that's the same kangaroo!"

"Oh yes it is. Look"

Dante pointed at the birthmark. There was no way it was a coincidence. It was the same person!

"And he did that with just this?" RJ grabbed the shaker cup incredulously, looking at it in wonder.

"He says it's a post workout. So I wouldn't waste it if I were you," warned Dante. The lion couldn't help but crack a smile. He'd finally found a solution to RJ's size issue.

RJ flipped open the lid on the pre-workout curiously. The container was rather heavy for what should've been mostly water. He brought it to his nose, giving it a sniff. His nose scrunching up at the strong scent. It burned from the mixture's strong scent.

"He told me that it's his own mix. Said he's starting a company or something," said Dante, as if he knew exactly what RJ was about to ask.

The rat brought the bottle to his mouth and began to drink. Unlike the other post-workout mixes he'd tried, this one was thick, almost slimy in nature as well as salty. RJ struggled to drink the oddly flavoured mix. But he managed to stomach it all, much to Dante's pleasure. "'Atta boy! What do you think?"

RJ wiped his lips after he'd drank down the contents of the bottle. The consistency and taste of the drink was somewhat... suggestive. He wasn't sure if it was placebo, but he was feeling better already! It felt like he had more energy, and suddenly he didn't feel tired anymore. "Coach! This stuff is amazing! It feels like I haven't even practiced yet!" The rat felt like he was surging with energy. He felt as if he'd just slammed three red bulls. Dante was smiling at this result. It seemed the shake was working well for RJ.

"See? I told you. This should help you pack on muscle like it's nothing." the lion crossed his arms boastfully, beaming down at the rat. Laughter bubbled up from within the rat, who was giddy about the results. It was then that the extraordinary properties of the drink began to show. It was slow at first, hardly noticeable. But as Dante beamed down on his team member he couldn't help but feel like the rat had gained some size on his frame. He swore that shirt wasn't that tight a minute ago! The lion briefly considered the possibility of him not noticing RJ's recent progress, but that couldn't have happened. Could it? He watched RJ like a hawk these past few weeks. He would've noticed, wouldn't he? Dante rolled his eyes.

'Whatever. It's probably just in my head.'

"Tell you what. Since I kept you late, I'll give you a ride back to the dorms. The catch is you have to help me pack the truck up."

"No problem coach!" he replied energetically.

Dante watched as RJ ran over to the weighted tackling bags. To his surprise, the rat hauled not one, but two bags over his shoulder at the same time. Dante's jaw dropped at the sight. Those bags were easily 100 pounds each, and RJ could only ever carry one on a good day. But here he was marching over without so much as breaking a sweat. While he was going to help out, he decided to sit back and watch RJ in action.

RJ loved it. His blood was pumping and all the work he was doing felt good! His shirt was starting to get tight on him, though. Without thinking RJ simply flexed, the sound of tearing fabric filling the air while the formerly intact shirt fell off his shredded frame.

"H-holy shit..." came a shocked voice. RJ turned around to see his coach frozen, staring up at him.

"What's wrong, coach?" RJ didn't feel like anything was out of place. Why was his coach looking at him like that?

"RJ... You've grown..." the lion muttered, hardly able to comprehend what he was seeing. At first, he thought it was a trick of the eye. Dante couldn't believe what had happened, but there was no other apparent explanation for it. He saw it with his own two eyes! Over the course of what must've been five minutes, his five foot nothing cornerback had grown into a seven-foot-tall beast! RJ had to have at least a foot of height on him now, and last he checked, he was six foot seven. Before he could consider the implications of this, RJ's confused voice interrupted his thoughts.

"Well, I did start a new routine. Didn't think it was that noticeable though... or are you finally paying some attention to the underdog for once, hmm?" RJ said with a smug grin. Normally he wouldn't dare talk down to his coach in such an arrogant manner, but his confidence had swelled up just like his muscles, and he felt the urge to take control of the situation.

Dante stared wordlessly, then looked over to the shaker bottle with the supposed post-workout formula. He walked over in a shocked daze, bending over to pick up the bottle. He held it to his ear and shook it. Nothing. Completely empty.

"That? That's my pre-workout, coach. It's what I used to help gain so much mass." It seemed the mixture also had an effect on RJ's brain as if it worked to make him believe nothing strange had happened. Briefly, Dante wondered if this is why the roo seemed so casual about the transformation, but his train of thought was interrupted by the egotistical rat stud.

"Looking for muscles like mine? Why would you need your own when you've got more than enough right here?" RJ struck a few bodybuilding poses, flexing hard and showing off just how much muscle he had packed on. The transformation was really getting to his head now, with the way he was acting. It was totally out of character for RJ!

"RJ! What the hell are you doing!?" barked Dante. By now he'd begun to notice something was definitely off about the rat, and an inkling of doubt began to sprout in the back of his mind, debating whether or not it was a good idea to let him chug the formula like that.

RJ just laughed as he struck more poses. "Oh, I'm just giving you a show, since you seem to be so obsessed with these muscles!" More than just his muscles had grown with the potion. Certain aspects of his personality did, too. And if the growing bulge in RJ's strained practice pants was any indication, the exhibitionist in him was much more prominent.

Dante wanted to stop staring, but the craziness of it all had him frozen. His mind was racing. 'What the fuck did I just do...' Dante thought to himself, gut sinking as the reality of the situation began to set in.

"Jeez coach. It's rude to stare. It's like you're mentally undressing me. Or is that what you wanted...?" the growing bulge barely contained in RJ's practice pants was really starting to strain the fabric, threatening to tear them open if they weren't taken off soon.

"I-I... N-no..." was all he could manage to get out. His mind was still reeling from shock, and though he truly didn't want RJ undressing he was unable to actually say that aloud.

"What was that? Sounds like a yes to me."

Before Dante could react RJ's fingers were already undoing his belt, and then the laces that held up his pants. Soon enough the pants were sliding off, revealing the treasure that lay underneath. The stretched fabric of a green jockstrap started spilling out from RJ's undone pants. It was damp with sweat, and clung to his skin, leaving nothing to the imagination. An absurdly thick, flaccid monster of a bulge was clearly outlined, with the head of RJ's cock having to tuck underneath his fat, low hanging nuts. Two massive, balls fighting for space in his overstuffed jock, to the point they were beginning to spill out at the sides just a tad.

Dante's eyes followed RJ's hand, watching him hook a thumb under the waist of his jock. This was it. The lion's eyes met RJ's gaze, the lion's gut sinking with the rat's smug grin. RJ must've somehow known this, as his grin got even wider. Moments into their intense staredown there was a loud 'SNAP!', prompting Dante to look down. RJ's jock had been so stretched it hardly made it halfway down his legs before the waistband gave out. He was met with the sight of RJ's massive pole, swaying to and fro between his legs, quickly stiffening up as RJ began to get aroused.

"Now look at what you've done, coach. I'm all horned up now. And I don't see anyone else around..."

"Around... for what?" Dante asked, fearing he knew the answer to his question already.

"Well I ain't goin' home with blue balls, and no one else is around to get me off. So guess what? Today's your lucky day!" RJ gripped at the base of his dick, jerking it in Dante's direction. He gave a rowdy laugh and stuck out his tongue as if to mock his coach openly. A brazen move.

"C'mon coach. I know you want it. So drop down to your knees for me and open wide~" RJ leered at Dante while his voice took on a mocking tone. Dante forced his body to move at this moment, spinning around and making a break for his truck, which was no less than five paces away. He had the keys in hand, and was pulling open the door when a massive weight crashed into his back, slamming the door shut. The truck shook with the impact.

"Nngh! What the hell! RJ if you don't get off of me I'll-!"

"You'll what, coach?" RJ's voice was dripping with dominance. He paused, waiting for a response. His lips curled into a smug grin. That was it. Not even a peep. He was in control now. "That's right. You won't do a damn thing other than bending over and taking my load like a proper slut~"

Dante's eyes widened. 'He couldn't possibly mean...' the presence of RJ's hands in his waistband told him otherwise. Dante could feel the force of RJ pulling at his shorts briefly, only for a moment before they gave under the force with a loud 'RRRRIIIIP!'

"Oops." RJ chuckled, finding Dante's fear amusing.

'Holy shit, he's actually going to rape me!' Dante thought. 'And we're on the private field; No one's gonna come here all day... I gotta get out of here!' Dante began racking his head for plans. He was never a thinker. His frantic thinking was interrupted by the warm, fleshy pole that was being ground against his back. The appendage left a wet smear on the lion's fur, and he didn't need to glance back to know that was RJ's dick. From what Dante could tell, it felt absolutely monstrous! It felt as wide and long as his forearm! Dante gulped and felt a chill run down his spine. Surely RJ didn't expect to put that in his ass, did he?

"Mmh. Doubt I'll have to warm you up much, either. I've seen those videos you took." Dante tried not to react, but his ear twitched, giving up his surprise. "That's right! Paid a lil nerd some good cash to hack into yer phone. Honestly, I was just lookin for dick pics, but those videos of you riding that dildo were way better than any shitty picture! I have to wonder, who were you sending those to? Hmm~?" RJ's voice had taken on a smug tone, and it was starting to get under Dante's skin. Before the lion could think up a response, RJ had decided he wasn't waiting any longer.

Dante grit his teeth as he felt an all too familiar pressure at his hole. The rat was right in his prediction that he wouldn't need a warm-up, but if Dante had any control over the situation he would've at least opted for a finger or two. An all too familiar dull ache spread through his gut as RJ managed to squeeze the overly thick head of his meat into the lion, aided only by spit and a generous amount of precum. Dante couldn't even adjust to the insertion before RJ began to cram more of his length into him. Several agonizingly slow moments passed as RJ worked his dick deeper into the ass of his coach.

"Ngh, you're certainly a tight little slut ain'tcha? Gonna have to get you a thicker dildo to practice on." RJ grit his teeth and drove his hips forward again, sinking the last few inches into Dante's ass. By now the lion was breathing heavily, hand clutching at his stomach while he attempted to cope with the rat's size. Dante couldn't tell, but he guessed RJ was twice as deep as his dildo ever got; and at nine inches it wasn't small by any means.

'Holy shit! He's going to break me with that thing!' he thought to himself, the lion struggling to cope with the numb ache that had spread up into his torso. Surely RJ'd gone deeper than any toy he'd had the pleasure of trying out.

The rat started slooowly pulling out, staring intensely at the way his coach's ass clung to his dick. The series of sharp breaths that reached his ears was the cherry on top. Pulling back a few inches he drove his member back home deep in Dante's ass, earning a deep groan from his coach. He wasted little time in working himself into a slow rhythm. It was more so out of necessity than anything. As much as he wanted, he couldn't just hammer away at Dante's ass just yet. It took every ounce of will in his body to restrain himself, if only for the first few minutes.

Dante struggled to keep up with RJ's pounding. It seemed that every time he was starting to get used to the sensation, the rat started fucking him harder. Dante was constantly out of breath, barely holding on as he was rammed full of rat cock. By now RJ was starting to hold back less and less. Dante found his body rocking forward every time their hips met, each time the breath knocked out of him. The paint of his truck was adorned with the lion's scratch marks, and the panels on the door had started to cave in from the force, the frame rocking side to side from the force behind RJ's hips.

Dante looked down, gritting his teeth and trying to bear with the size. It was still an intense, overpowering sensation, one that was excruciating. He was vaguely aware that the sharp breaths had turned to loud moans. Somewhere in the back of his mind it registered that he was rock hard, dick throbbing from the treatment. Dante had put up a fight in the beginning, but by now he'd been broken in. It didn't take nearly as long as RJ thought it might've. Dante's body shook as an orgasm hit, the lion's respectable member emptying his load all on the side of his truck. He tried to stifle his moans, biting his lip to the point of bleeding. But it was unmistakable he'd cum fromRJ's dick alone. That monster shaft having ground a hands-free orgasm out of the emasculated lion.

RJ couldn't lie, his coach's ass felt really damn good. He knew he was coming close by the time he'd ground an orgasm out of Dante, but wanted to see if he could hold off a bit longer. At the same time, he really wanted to get a proper pounding in before he left. RJ decided on the latter, widening his stance and grabbing at Dante's hips. He gripped the lion hard enough for his claws to break skin, and started drilling Dante's asshole. RJ's cock slammed in and out of the abused hole, nuts slapping together loudly. RJ could feel a mix of precum and sweat dripping down his balls, starting to drip off of him frequently. He was so close to orgasm he was flooding Dante's guts with pre, so much that each thrust made a lewd 'squelch', the sticky mess oozing out around the rat's dick. In a lewd display, Dante's stomach bulged with the shape of RJ's dick, something he found incredibly arousing.

As time went by RJ inadvertently ended up pounding another orgasm out of Dante's abused prostate, feeling the weak shudders as he shot a smaller, thinner load onto the ground. This was what finally pushed him over the edge, RJ slamming balls deep into the lion and unloading.

"Fuck yeah! How's the seed of a superior male feel, slut?" RJ yelled out in triumph as the first wave of orgasmic bliss washed over him. It was an intense, overpowering feeling in his new body, one that had him struggling to stay standing. The first shot of cum was so powerful and so thick RJ swore he could see it bulging Dante's gut as it shot out of his cock. It was soon followed by several more thick bursts of seed, slowly but surely filling Dante's gut up with thick jizz. RJ drew his hips back and thrust them forward again, causing a load of thick jizz to gush out around his dick, slopping to the ground in thick globs. RJ watched with a sense of wonder as slowly, but surely Dante's gut rounded out from the sheer size of his load. A testament to the rat's newfound virility. He had a feeling it was one that he'd be treated to more often if the fucked silly expression on Dante's face was to go by.

RJ's orgasm slowly tapered off, and he began to pull out, the head of his dick slipping out with an audible 'pop!', followed by a gush of cum. Without RJ to hold him up Dante collapsed in a heap beside his truck, legs much too weak for him to stand using his own strength. Everything was hazy at that moment, the lion still lost in the bliss of his afterglow. He could feel a warm wetness seeping into the fur around his taint, and he vaguely acknowledged the stream of cum oozing out of his asshole. He was still trying to piece together what had just happened. RJ smiled at his handiwork and walked over to the lion's torn pants. RJ rummaged through them and produced the keys to Dante's truck.

"My residence is in the southwest building. Keys will be in the gas cap. Surely you had the walk of shame back in your college days, eh coach?" RJ laughed to himself as he got in the truck, the rumbling motor roaring to life. "See you at practice coach!" The rat laughed, reversing out of the spot and peeling out of the parking lot. Not like Dante could do anything about it; the lion was still gathering the strength to stand. It was times like these Dante resented the school for building a field several blocks away from the main campus.