Best Friends Flex Together

Story by Arkham_Beast on SoFurry

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Part two of three of Max's bulked up journey, this time PJ gets a piece of that action~ ;3


It’s been almost a month since Max joined ‘Big Bob’s Gym’. Just a few days and he bulked up, big time, all thanks to this strange drink actually called ‘Bulk Up’ who’s manufacturers sponsor the gym. And saying it’s a miracle drink would be an understatement.

He did become a total magnet, women and some men would just come up to him, showering him with compliments, of course, most of them just want some arm-candy to show off. The attention, regardless of ulterior motives, was just overwhelming for the poor young man, especially since he was basically a nobody before all that bulk.

Unfortunately, this kind of bulk came with its own ‘issues’ to deal with. Three, to be exact.

  1. He needs to keep working out if he wants to keep that bulk (naturally), but he doesn’t need to keep drinking ‘Bulk Up’.

  2. He needs a whole new wardrobe since none of his old clothes fit him now. They had to borrow clothes from Uncle Pete, shirts at least.

But it was the third one that really. “Ooohhhh, fuck~!” He moaned as he laid on his bed after a hard workout in his room, one hand teasing a nipple and another fingering his sweat-lubed ass. “Come on… Just a bit… more…” The third issue he’s been facing lately is how his libido rose. He can’t believe how constantly horny he’s become lately, like at best he goes most of the day with half a chub but his cock never seemed to go down below that.

“Ffffuuuuuuck!” Max let out a deep, loud growl as he shoved his fingers as deep as he could, his cock throbbed twice before releasing a massive and thick stream of his cum that splashed the wall, barely missing the TV, but it got caught in the splash area. His orgasm went on for almost a minute before dying down, allowing him to finally calm down. “Phew! Time to start my day… after I clean up this mess.” He chuckled bashfully to himself before he stepped out of his room, still naked, to grab the mop.

“Hey Ma- ULP!” Goofy froze in place as he saw his son stepping out of the room, his face almost glowing red at the sight of his sons massively-hulking form casually walking past.

“Morning dad! Don’t worry, I’m just getting the mop to clean up my ‘mess’.” He assured his dad casually as he passed by.

“Uhm… yeah, sure… Maxie…” Goofy replied nervously, tugging at the collar of his shirt. Ever since his son turned into such a behemoth of a young man, he just couldn’t believe his eyes, it still taking a bit to get used to such a sight.

And boy what a sight it was. That wide back, the muscles making hills and valleys across it, the way his pecs bounced with each heavy step he took, those arms and legs with those tantalising veins going along them… but damn, that co- “Oh gorsh!” Goofy basically slapped himself awake before his thoughts became even wilder. And before Max came back and saw the boner in his pants.


“So, Max… how did you get that big so fast?” PJ asked his friend as he, Max, and Bobby sat on a bench in the park, eating some hotdogs, although Max was on his fourth one already.

“Working out, simple as that.” Max replied with a shrug, shoving the last of the hotdog into his mouth, sucking the ketchup from his lips.

“Uh, pardon my french, but I call bullshit.” Bobby said in sharp skepticism. “You don’t get THIS huge just from going to the gym a couple of times. Even my lanky ass knows that.”

“Okay, fine. Remember that drink I told you about? That ‘Bulk Up’ stuff? That’s the reason I’m this big this fast.” Max tapped his chin in thought. “Although, my trainer did say that my body was different. ‘Took to the drink a bit too well’ Is what he told me. According to him, I bulked up too fast.”

“You can say that again.” Bobby said as he shoved the last of his own hotdog into his mouth. “Where can I find that stuff?”

“Big Bob’s Gym.” Max smiled softly at the idea of Bobby going to the gym, the idea sounded both good and funny in his head. “That’s the only place you’ll get ‘Bulk Up’.”

“Oh man! No supermarket corners or vending machines?” Bobby got a negative head shake from Max. “Ugh.” He groaned as he slid down the bench.

“Have to say though, you’re looking pretty good, Max.” PJ said, admiring his friend’s new build.

“Really?” Max asked, a small blush suddenly coloring his cheeks. “I-I’m not too big, am I?” He asked sheepishly as he raised one arm, giving it a flex and making his bicep bloat out, solid as a boulder with veins snaking all over it.

“Yeah, bro!” Bobby jumped up on his seat again. “Killer bod, killer smile. You’ll get all the chicks and studs you could want!”

“Y-Yeah! All you want!” PJ agreed, a bit of nerves in his voice as he ogled at that flexed arm.

“Gee, thanks guys! You’re the best buds a guy can ask for~” Max grabbed both of his friends in a tight headlock-hug, his arms almost engulfing their whole heads.

He didn’t notice how both of them popped a boner each from that gesture alone. The two sharing a nervous look as it happened.


The next few days were almost a blur, between hanging out with his friends or going to Big Bob’s gym to workout, Max’s time was almost fully taken at this point, even when he’s not at the gym, he made a habit of either working out at home or going out on jogs for most of the day. Everything was pretty good~

Except for one thing. “Fuck yeah… take that fucking cock…” Max growled deeply and huskily as he watched a gay porno, showing a muscular, daddy-type dude going to town on some twink’s ass. “But damn, that’s a good fucking cock~” His voice had a hint of jealousy with that remark. Seated with his legs spread, one leg on the desk to keep himself spread, while his hands were busy with his cock and ass, as usual.

“Come on… come on…” He groaned as he stroked and fingered himself harder and faster.

But this time… he didn’t cum. “Oh, goddammit!” He almost barked out as he stopped jerking himself, sitting properly in front of his PC with a deep, annoyed scowl. “This is not cutting it. Getting pretty old and boring…” He grumbled to himself as he checked the multiple tabs he had opened, all showing some kind of gay porn.

But he briefly paused on a specific one, where it was a muscular guy, almost as bulky and old as Max was, riding a big dildo like a mechanical bull. “Damn, that’s a big one. How can he take something that big?” He focused a bit more on the video, his eyes lazering down on the toy.

His face breaking out in a fierce blush as a thought crossed his mind. “Can I? But how would I hide it?” His dad is pretty thorough when he’s cleaning, and he was the type that just barges in, rarely knocking. Max bit his lower lip… and began searching.


The next day, Max woke up to a phone call, groaning as he looked for his phone. He groggily accepted the call with a hoarse “Hello?”

“Hey Max!” It was PJ. “Do you mind if we hang out today… at your place?”

Max didn’t miss the nerves and slight concern in his best friend’s voice. “Uh, yeah! Sure! I’ll be waiting.” PJ’s tone definitely woke him up from his sleepiness, basically jumping out of his bed and getting into the shower for a quick scrub.

He was barely dressed when PJ came in, he’s a trusted family friend ever since his and Max’s childhood, so he knows were the spare house key is hidden and is allowed to just walk in. “S-Sorry for just baring in, Max. I just wan-” He froze at the door, just as Max was bent over to put his pants on, getting a nice eyeful of bubble, muscle glutes.

“Oh, hey Peej! Didn’t hear you come in!” Max said bashfully, frozen in place at the sudden intrusion as well.

PJ on the other hand, just grabbed the door and slammed it shut. “I’ll wait downstairs!”

Max dressed up real quick, wearing a tank top that hugged his torso quite tightly and some baggy sweatpants that hung a bit loosely around his waist, barely held up by his girthy cock alone. “Hey, hope you didn’t wait long.”

PJ was already in front of the TV, booting up one of the videogame consoles that Max had. “Nah, it’s all good. Sorry for barging in like that.”

“No worries, dude. We literally grew up together, we’re basically brothers.” Max assured his childhood bud with a comforting pat on the back. “So, what did you want to talk about?”

PJ swallowed some nerves audible, his voice suddenly shaky again. “H-How about we play a few games first. Last I checked, you still didn’t beat me in that fighting game.” He said cockily, trying to rile Max up.

“Oh, you’re fucking on!” Max accepted the challenge and grabbed the extra controller, booting up the game in question.

With Goofy out of the house thanks to his new job, Max and PJ had the place all to themselves, they literally spent the day playing video games, goofing around, eating junk food to their hearts’ content, it felt like they were back in their teenage years, and it was quite the blast!

Around the early evening, the two of them were in the kitchen, putting all the fun on hold for now to freshen up with some cold drinks, with Max having the ‘Freeform’ version of Bulk Up. Seeing his friend taking big gulps of the stuff, PJ finally asked. “So… does that stuff really work?”

“Hmm? Oh yeah, it sure does.” Max assured smugly, raising his arm and and giving it a hard flex to show off. “I’m sure you don’t believe it, but I literally got this much bulk in less than a week!”

“Wow… M-May I?”

“Sure bud!” Max walked around the table to sit beside his friend, leaning in to allow PJ to have a feel. PJ sure enjoyed it, running his hands over those hard, strong muscles, as Max said it, he didn’t believe it, but that much bulk sure FELT real right now in his hands.

“W-Wow… holy shit, they are real.” PJ exclaimed in absolute awe, his eyes wide in shock as he continued to run his hands over his friend’s bod. Max just smiled wider, borderlining a smirk, flexing his arms, biceps and triceps, bouncing his pecs as PJ’s hands rested on them, even lifted both arms and flexed his lats.

He was giving his best bud a full on show.

“I’m guessing this is why you wanted to come over?” Max asked, his tone telling PJ that he knew what was going on.

“Um… wo-would you be mad if I said ‘Yes’?” PJ asked sheepishly, pressing his fingers together.

“Hell no! Anything for one of my bestest bud and ‘brother’!” And to show that he means it, Max turned to directly face PJ before taking off his tank top, revealing his sweaty, slightly glossy body. “Here, all for you, bud~”

To say that PJ was ‘hard as a rock’ was an understatement, he was so aroused, it was borderline painful that he had to adjust himself in his shorts. But he wasn’t going to let this chance get away as he leaned in closer, his hands getting busier with admiring his ‘bro’. Max moaned in appreciation of the attention, especially when PJ went back to Max’s pecs, now getting firm handfuls of those meaty mounds.

“Oh fuck yeah, you’ve been waiting for this, huh?” Max said huskily, raising his hands behind his head, giving PJ more access to his hot bod.

“You have no idea~” PJ licked his lips once Max’s arms were raised… then surprised the canine as he shoved his face right in between his pecs, taking deep huffs of Max’s appetizing musk, his hands going down to tease and pinch at the canine’s nipples.

“Oh yeah! There you go! That’s more like it!” In the back of his head, Max can’t believe how this, mere foreplay and touching, was getting him excited, it never happened like this when he did it. Was this what he was missing? “You know what? Here!” He suddenly jumped up to his feet, pushing his sweatpants down until his cock sprung out, sending a rope of precum flying. It throbbed and twitched with desire, covered from head to base in angry veins. “I think you deserve a treat, big boy~”

PJ was not going to say no! He went right for that offered man-sausage, hungrily lapping at the sides as he stroked the length of it, taking deep breaths of that heady, inviting musk of Max’s, his small tongue sliding along the bottom from the tip to the base and back up, occasionally giving those heavy, fully balls plenty of attention, settling with giving them a tongue-bath since they were too big for him to slurp into his mouth, but he was still doing his best to pleasure his bro. Max, meanwhile, was on cloud nine! Eyes rolling back, mouth slack and open, tongue flopping out as he panted like the happy dog he was right now. Oh yeah, this is definitely what he needed.

He suddenly jumped in surprised when he felt PJ take the fat head of his cock into his mouth. “Oooohhhh, yyyeeeeaaahhh~” He growled deeply, eyes fogging up as a dreamy expression twisted his face. But he desired more, much more. “Come on, I’m sure you can take MORE!” He barked excitedly as he grabbed PJ’s head firmly, right before SHOVING him down, forcing all 13 hard inches down his best friend’s throat.

And just began thrusting.

“OHGMPH! UMG! GLG! GUAG!! MM!!” PJ tried to get his attention, patting and smacking at his thighs and abs. But that clearly didn’t do anything, on the contrary, it seems to excite the jacked up canine even more.

“Hang on, bud! Getting really close here!” Max encouraged, leaning down until he was looming over PJ, his thrusting now short and sharp, barely popping out of the feline’s throat before sliding right back in, his balls faintly but audibly gurgling as they churned up one hell of a load. “Fuckfuckfuckfuck! Here it comes bud!”

With a final thrust and mighty roaring-howl, Max finally let loose. His first shot felt like a cannon blast going straight down PJ’s throat and directly into his belly. PJ’s throat visibly bloated out and expanded each time Max’s cock throbbed as it shot another big blast, his chubby belly quickly expanding even more, getting bigger and heavier from the sheer volume of his friend’s load.

After a solid minute of orgasming, Max finally calmed down. “Phew… hope that- Oh shit!” Finally catching on to what he did, Max released PJ’s head, finally allowing the feline to pull away, PJ gasping hard for air as he got a few more, small shots to the face of what remained from Max’s load, his face, shoulders, hair, and most of his chest getting drenched.

“Oh man… *ulp-BUUUUUURP* Guess that settles dinner for me, huh?” PJ’s little joke got a chuckle out of both of them.

“Sorry about that, bud. Got a bit lost back there.” Max apologized, sheepishly rubbing the back of his head.

“Gee, couldn’t tell.” PJ shot back teasingly as he scooped up some of Max’s cum from his face and lapped it up from his fingers and hand. “Hmm, pretty sweet, surprisingly. With a hint of saltiness. Maybe thick enough to use in cake.”

“Eee-hehe-ewww! Stop, you weirdo!” Max laughed as he playfully smacked PJ’s arm, making sure not to put too much strength into it.

The two of them shared a nice laugh as PJ took off his cum-soaked shirt, tossing it aside for later. But suddenly… *Grrrrgglglglglrrrlg* His stomach began gurgling quite loudly. “Oh… crap…” He clutched his belly and doubled over.

“Woah! PJ!” Max was right beside his friend, face painted with concern.

*Crree-ee-eeaakk* A faint creaking sound could be head, like leather being stretched. When Max focused, it turned out the sound was coming from PJ. The canine’s eyes almost popped out of his skull as he took a step back.

“Grrh.. rrrhhhaaaahhh~!” PJ let out a lustful growl as his body began feeling tight and compact, it was painful, but merely stings before it was replaced by total pleasure. Panting for breath as his skin stretched over his growing body, the fat around his arms tightening as it was almost being sucked in, right before his arms basically EXPLODED with muscles.

*BWOMPH-BWOMPH* Along his arms, biceps as big and thick as his head, his moobs growing and tightening into a nice pair of muscular tits, just like Max’s, his small nipples growing in size till they were about as thick as a finger. His portly belly shrunk a bit, but it stayed for the most part, changing from a paunch to a soft-ish musclegut, the power then trailed down to his legs, his already thick thighs tightening to a pair of solid and mighty tree trunks, then his calves tightened up as well.

“FfffuuuuUUUCCKKK!” PJ cursed quite loudly as he flopped back, the final steps of the change concentrating all into his crotch, his cock literally bursting through his pants and underwear, cock and balls growing before Max’s eyes, his cock growing quite girthy, while his balls filled up and grew to the size of dragonfruits!

And once the change was over.. *SPLOOOOOGGGEEE* The orgasm that hit him was the mightiest and most intense one he’s ever had, he was basically a fountain, spraying all over the place, splattering the whole dining area, some of the kitchen, and some of the living room.

Then suddenly blacked out from the overwhelming sensation that wracked his body all over.

Max watched the whole thing silently, face frozen in awe, even when he was caught in the big splash zones, he didn’t blink. Not until PJ was finally done, did he break out of his trance and notice the state of the house. “That’s… gonna be a pain to clean…”


A few days later, Bobby was in Max’s house, sitting on the bed while Max and PJ sat on the floor in front of him, rubbing his chin in thought. “Let me get this straight. You blew him?” He pointed from PJ to Max, both nodding silently. “And you, came in him?” From Max to PJ, also nodding. “And this *gestures to PJ’s new bod* was the result?” More silent nodding.

“I’m guess it was… whatever my body had stored of that Bulk Up stuff? I don’t know the whole science behind it, but we got checked out at the clinic and neither of us are in danger of anything, basically nothing changed in our bodies, just… this.” Max said gesturing to his and PJ’s buff bodies.

“Man, must’ve been pretty sweet, huh?” Bobby asked sarcastically.

“Oh yeah, very sweet in fact. Like liquid candy.” PJ said jokingly, getting a punch to the arm from Max who’s face was almost glowing red.

“Kinda wish I would’ve been there. Maybe get a bit of splash here and there.” Bobby said, chuckling… but then noticed the smirks that Max and PJ shared. “What?”

“I mean… you’re right here, right?” Max said as he stood up.

“And as your best friends, you can rely on us~” PJ added as he stood up as well.

It didn’t take a rocket scientist to know what they were talking about. “W-Well, uhm…” He barely spoke up when both canine and feline dropped their pants, revealing their heavy and ready-to-breed cocks. The difference between Max and PJ could be instantly noticed. While Max had the gut-punching length, PJ had the whole gaping girth on his side, taking either of them would be quite the trial.

“What do you say, bud?” Max got close, his cock in hand and aimed right at Bobby.

“You might have to work for it, though~” PJ stood beside Max, doing the same, their hands wrapped around each other.

“Oh boy… this is gonna be a loooong day…” Bobby gulped as his glasses reflected the two cocks eagerly offered to him.


Later that night, Max was in his bedroom, sitting at his PC and playing some online RPG, doing a raid with some randos for the third time as he was trying to get a special item. “Hey, Maxie! Got some laundry for me?” Goofy stepped into the room, without knocking, laundry basket under one arm.

“Yeah, right by the door dad.” Max casually replied, gesturing with his thumb over his shoulder.

“*gulp* Gotcha!” Goofy’s eyes trailed over his son’s broad back, not missing how naked his son was as he was focused on his game. He just silently collected his son’s dirty laundry and left the room silently. As Goofy was tossing clothes into the washer, he picked up a jockstrap, Max’s new form of underwear ever since he got more used to his body, pausing with the sweaty and musky piece of cloth in his hands.

Then, unable to control himself, shoved the pouch right against his snout, taking a long and hard sniff, ending with a sharp snort, of his son’s amazing, manly scent. “Ooohhhh, Maxie…” Gosh, he felt like such a pervert for doing this, but it just felt soooo gooooood~! With his lungs filling with Max’s musk, he grabbed his cock through his pants with his free hand, stroking himself slowly as images of his son’s sexy form filled his lust-addled mind.

He was being such a bad, bad dad~