FSE

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It had been a productive day for Frank and his two-man construction crew. The pair of them had just taken down a dilapidated structure on a lot that was meant to have a library built in its place. Normally this would've been a difficult task requiring a whole ensemble of different people all working together to accomplish the task, but the two of them were highly trained professionals who could handle anything thrown their way. Well, at least he was - he ended up learning every aspect of the job so that he could take care of it himself, but he never needed to in the past.

He started his company from the ground up with his husband over a decade ago and rapidly became well known for being incredibly efficient with their work, as well as being relatively inexpensive compared to their competition. Things were going great until a one-two punch of Mikhail getting injured on the job and having to lay off practically everyone else on the team due to a rough financial year meant that they might have to declare bankruptcy and shutter their doors for good.

Frank wasn't about to let that happen.

Though he could only take on smaller jobs, the merle collie was still determined to work to his fullest extent, even if it meant he was doing it alone. At the very least, Mike could handle the administrative side of things while he dealt with the physical work. This ended up being far more lucrative than either of them could've imagined.

Through Frank's continued grind, he found his body actually toughening up due to the persistent exertion. It was expected, to be sure, as one gains strength the longer that they work themself. What wasn't expected was that, not only was he getting stronger, but he was also getting bigger as well. This wasn't your average growth that a manual labourer might achieve either - oh no, the canine experienced full-on surging spurts, piling on size in periodic expansions. He'd end up a little taller each time, but he'd get oh so much thicker.

These advancements allowed him to tackle harder and harder jobs. Whereas before he'd need heavy machinery to transport the most burdensome of construction supplies, now he could forgo pretty much any and all equipment. He wasn't sure why he was getting so huge, but he wasn't about to look a gift horse in the mouth.

It was a boon to Frank's love life as well. The bedroom became more passionate than ever before thanks to his increased size, which unexpectedly had another side effect. As if it were a product of their lovemaking, Mike, too, ended up undergoing his own growth spurts. Their nightly escapades grew more intense the closer in size they got.

The dog had grown to be a titan of not only his species, but of men anywhere. He completed larger jobs that would otherwise have taken him forever, but he found that, even though his increased size helped him a ton, he still eventually needed aid in finishing some of the more complicated work he was assigned.

That's where Frank's son, Colin, came into play. While the younger collie was in the midst of his grad program, he found that he had a bit of a lull during the summer and thought that it would be the perfect opportunity to make a bit of extra cash.

Frank was thrilled beyond belief, not only because he had more hands on deck, but because, due to the nature of his son's studies, the tricolour canine was taking after his old man in ways he never imagined in the past.

Colin was a veritable hunk of a collie, much like his very own father. He was a handsome man, though the nature of his work clothes made him look far more rugged than he normally did. His bulging muscles pushed every bit of fabric to its absolute limit, but the material was structurally sound enough to withstand even the most ardent of flexion. It did, however, mean that the clothing left nothing to the imagination, but the younger dog didn't mind.

Frank also didn't disapprove, much to his own shock. His heart fluttered whenever he saw his son hauling steel I-beams like they were nothing or barreling over a concrete wall that would've needed some kind of machine otherwise. Only then did he realize that he was turned on by these feats of strength, but he did everything in his power to keep himself calm enough to carry on with his work.

It was when Frank saw his son drive a fist through a thick masonry wall that he couldn't resist the younger collie anymore. He'd adjusted himself several times after that but found that he couldn't do it nearly as discreetly as before. Huffing intensely, he positioned himself in such a way that his bulging erection was hidden to all but himself. "We've been out here for some time already. Let's take a break." He called out to his son before heading in the direction of the trailer on site he was using as his office. It might've looked like he was jogging to the makeshift building, but Frank would have protested that, saying he was walking quickly and with purpose.

He locked himself in his office, nearly buck naked from having shucked his clothes off as fast as possible, but achingly hard. One hand was stroking his dick while the other was grasping a thick nip. It had been a while since he'd had release and that display threw him over the edge.

Colin, meanwhile, had opened the door while the older dog was in mid-jerk, oblivious as to what was going on as he had his nose buried in some sheets on a clipboard. "Hey dad, I've got down everything needed for the next shipment right here. I just need you to-" The smell was the first thing that struck him - a piquant aroma of heady, masculine musk that filled his nostrils and lingered in the air around him. Then he looked up and saw one of the hottest things he'd ever seen in his life.

The sudden commotion startled Frank. "Uh, hey, kiddo. I, erm, think you've got the wrong idea about this." His breathing was erratic, not only from the exertion he was putting himself through, but of how close Colin now was to him when he was in such a vulnerable state.

Colin gulped, his own election swelling with need. His pants were at the brink of destruction, as was his ratty A-shirt. "Oh, um, sorry..." He stammered, his breathing rapidly picking up pace. "I should go."

"No, wait!" Frank bellowed, a bit embarrassed as to how uncontrolled and needy his words came out. "Don't go." He saw the younger canine frozen in place, hand on the door handle. "Lock the door and come here."

Colin did as he was told, locking the door in his grasp before making his way to his father. He couldn't help but feel jittery. "Yeah?"

"No, come closer. I want to feel you." Frank commanded as the tricolour dog followed his instructions, cornering him in his own office. He often thought about it, but he never thought something like this would actually happen. He was overwhelmed with emotions - surprise, arousal, maybe a hint of fear, but the strongest of all was pride. This was his flesh and blood, his son that he raised on his own. He loved his boy and now got a chance to show it.

Colin smirked as he reached out and ran a finger along Frank's girthy length. "Like father, like son." He placed Frank's hand on his crotch, the elder collie offering no resistance. "Heh, you said you wanted to check me out." Colin let out a lustful groan as he let Frank's hand linger, the merle collie's eyes trailing up as he flexed a titanic arm. "Go on, give it a feel, pops. You know you want to."

Frank wasted no time, gingerly running his hand up Colin's torso, feeling what hard manual labour does to a man. He needed to stand up to fully reach his destination, where he could properly give that bulging arm the attention it deserved. It was then that he noticed just how much his boy took after him. not only with how big the tricolour collie got, but also how he wore his size. The apple fell as close to the tree as it possibly could.

Frank panted lewdly as he felt that mighty peak of an arm. He swelled with pride as much as was possible. Colin had gotten so big and strong, just like him - and smart too! He was a hard worker with just the right dash of ambition and confidence to make life exciting.

Colin hummed a note of approval as the older dog gave it a light kiss. "You can do more than that if you want."

Frank grinned, a claw at the top of Colin's shirt collar. "Let's see what else you're packing, boy."

Frank impishly grinned as he tore Colin's shirt asunder, revealing the packed barrel chest that was contained within it. The younger collie wasn't inherently top heavy by any means, but he possessed a godly chest any man would be proud of. Tossing the fabric remnants to the ground, Frank ran his hands across his son's broad pecs, feeling the fluffy, musky fur between his fingers. He was a product of his own loins, alright.

Frank pulled his hands back, feeling Colin's essence in his fingers. He sniffed, and instantly his shaft turned hard as granite. He plunged his muzzle into his son's fluffy pectoral fur, huffing and licking his way through each batch - if it was possible to get diamond-hard, he was there, drooling pre onto the floor. He could also feel an old friend welling up inside him - a growth spurt, something he hadn't experienced in a while. But his son's musk rekindled that power in him. He wanted to experience his son's potential now more than ever!

He nosed his way up Colin's musky chest fluff until he reached his son's titanic traps, where he gave him a series of quick smooches. The sudden worship of his muscles caused the tricolour collie to moan in delight. The shift in weight pushed the two of them onto Frank's desk, where Colin was now beneath his father. Unbeknownst to Frank, Colin routinely had a fantasy similar to this for years now, hoping he could one day fulfill his deepest desires. He grabbed onto the merle collie and pulled him closer, making both their pecs and dicks meet. Funnily enough, despite not being something he usually saw on other people, both he and his dad sported a thick tortoise shell of a gut, a symbol of how sturdy the pair of them were.

Overcome with lust, Frank grabbed a hold of Colin's work pants and tore them off completely. There were no protests as they both wanted what was coming next.

Frank admired the towering pillar of canine flesh that stood before him. It was thick and tall, a monument to Colin's might. The merle collie marveled as he grasped the flesh - his massive mitts couldn't even reach around it, and even when applying some pleasure, it barely dented. For a dog used to molding steel like putty and crushing concrete like Styrofoam, it was an astounding, subtle show of Colin's power. He was practically a god from ancient texts, a titan.

Or rather, he could be. Frank knew just as he had a growth spurt brewing, and Colin likely had more welling up in him too. The thought pleased Frank to no end.

The older dog ran his long tongue along the flesh, eliciting moans of pleasure from his son. He taunted and savoured the flesh, Colin grunting his satisfaction alongside huffs of delight. Frank eventually stared down the tip before opening his jaw wide, gobbling the younger collie's cock until it tickled the back of his throat. He hummed atop and lavished the tool, but he didn't want his son to blow yet. After all, this was just lubing him up.

"Shit, ahhh," Colin exhaled sharply from the stimulation, "damn, you're good at this! Looks like you've got some tricks left to show me after all." He huffed, running his fingers through his dad's hair. He felt a fire ignite his soul - of course there was the growth spurt coming, but there was also an intense love for his father. Together, they shared an intimacy unmatched by anyone else. His father had raised Colin alone when he was just a pup, now he gets to return the favour and show the elder collie just how much he can give him. He used his other hand to squeeze at his thick nipple, a moan escaped from his mouth as he did so. He needed his body to grow to match his love for his father.

Frank felt his hole clench in apprehension. He hoped this would feel as good for Colin as it was going to feel for him. He wanted his son to flood him, with the growth spurt bubbling him he was sure he could take it. "Not nervous, are you?" Frank chuckled as he stood up and over Colin atop the desk, angling himself wide over Colin's engorged prick.

"Nah. But be careful, pops, I'm not gonna hold back on you." A thick wad of pre shot from his own massive cocktip, total music to his ears. Frank almost always topped, his husband Mike generally playing the part of a willing bottom; but if there was anyone that he wanted to give his finest bottoming performance to, it was his oh so big, oh so strong, and oh so handsome son. The older collie felt his core stir as the tip of Colin's penis brushed against his strong glutes, this was it...

Frank's breathing intensified - he hadn't been this giddy since his and Mike's honeymoon, though the night they both passed 800 lbs was pretty good too. He positioned himself over his son, his tailhole winking with anticipation - he wanted this, he knows they both do. He'd line Colin's dick up with his hand, but it seemed like it knew where to go. And with how lubed up it was it just slid right in without any resistance.

"Ahh, god!" Frank cried out, being stretched wider than he ever had before, stretched out not just by anyone, but his own flesh and blood. His heart was beating a mile a minute, but his own shaft was leaking pre all over the tricolour collie's meaty chest. He held onto Colin's gigantic shoulders for dear life, it was a lot to take in right now, but he knew that would change soon.

Frank panted and yipped as his son's colossal shaft bucked flush into his hole, every nerve alive with the thrill of sex. Colin was very good - no, amazing! Gosh, his son was as talented in his sexual performance as he was with his job. Frank growled and barked as Colin pounded away at him, his insides burning up from the excitement.

It was then, in a moment of profound clarity, that Frank felt his heart beating in tandem to Colin's thrusts. It was as if they were one dog, driving itself wild with pleasure and desire. And that was the moment Frank realized they were both going to have a growth spurt. Together. They would push each other to grow inch for inch, a physical nod to their growing love for each other.

Frank leaned forward, clamping his anal muscles as hard as he could - heh, only Mike had ever been to handle it, steel toys were crushed with ease - and Colin snarled like a beast before Frank buried his muzzle onto his son's, sharing a passionate kiss as Colin pummeled away and Frank's pre smeared over Colin's heaving, hulking chest. "Give me all you got, kiddo. You gotta grow, and so do I."

"If you were anyone else, I'd say you're not ready for it," Colin groaned between panting breaths, "but you wanna be pumped up as much as I do." His pistoning slowed, he could feel the pressure rising inside him. The elder collie was aggressive with his lovemaking, with Colin barely able to keep up with his anal assault. His chest heaved with every breath he took, one step closer to release. Just then he felt it and cried out, the floodgates had released.

Frank gasped, never had he felt this kind of load being forced into him before. His son was a certified stud, though he wasn't that far behind him in terms of output. He lasted all of three seconds of getting filled before he felt his own dam burst, shooting rope after sticky rope at the monstrous chest of the tricolour collie. He felt his hard dome of a gut distend further with each bucking of Colin's hips.

Their climaxes seemed like they lasted an eternity, but they eventually petered out. All that was left was two cum-soaked, heavily panting, beefcakes of a father-son collie duo. They consummated their breeding session with another passionate, forceful kiss, embracing each other as hard as they could, knowing full well what awaits them next.

If anything, the sensation of growth made the two of them more passionate. Frank had pulled off of Colin's shaft in an abundance of caution, sending a wave of fresh dog seed out of his backside and onto the floor. But as their tongues intertwined, the gigantic red rocket pulsed against his crack, still hard and ready for another round. Colin had that stamina, but Frank knew that was the growth spurt kicking in.

"Let it all out, kiddo, because I'm not holding back on my end," Frank whispered. His own phallus was firmly entrenched between Colin's enormous pecs, capable of feeling as good as any hole. And with a wink and subtle motions of his wrists and arms, he was working Frank's shaft like the best bottom. It was impressive he could even do that, Frank's shaft had become so strong over time, he often used it like a drill bit, the "glory hole maker" as his hubby called it.

Colin's insides were on fire. Most of his growth spurt were modest affairs, an inch or two. This felt like something more was stirring in him, that he and Frank would be truly unmatched as a father-son team if they kept pushing each other just a little longer...

Frank had to smirk, if it were anyone else between his son's pecs right now, they'd be crushed in an instant. Only his diamond-hard tool could withstand the onslaught from the slabs of concrete the tricolour collie had as pecs. The strength they both possessed, the power they felt... It was like they were made for each other.

And then it happened. It was slow at first but picked up when the moans started. Their arms, legs, dicks, height - every measurement across their bodies had inches added, their frames growing to accommodate. Pounds of muscle rapidly began to pile on, so much so that the desk they were leaning on for support began to groan in protest of the added weight.

"First time I get to witness someone else going through this," Frank huffed. He was tense all over from the growth he was receiving, but he was clearly enjoying this.

"Aahh!" Colin cried out, nearly overwhelmed by pleasure. This was far stronger than any other growth spurt he'd had up to this point. "This is a lot," he spit between panting breaths.

"I'm here," the merle collie brushed the side of his son's face in an effort to calm him down. The younger collie was amazed at how well his father was taking this and wondered if he'd be like that at some point.

"Dad, I... I need you," Colin gulped, overcome with a flood of emotions stemming from the euphoria shooting through his body. "I need you in me. I want to feel you fill me up!" It was obvious they were both ready to go again, though neither had partaken in sex while the growth was still happening. There's a first time for everything and Colin was more than happy handing over the reins to his behemothian father.

Frank gulped. The issue wasn't whether Colin could take it. Granted, the merle collie's massive prick could smash through just about anything, but Colin was clearly strong enough to take it. Plus, for being as supremely gifted as he was with a prick measured in feet, and growing by the moment, Colin, too, was sized right to fit him, and growing as well.

The concern was nothing short of every man's fear - that he'd be good enough. Frank had done this countless times with Mike, as well as putting some lesser men in their place when they got too big for their britches. But his son, he wanted to amaze. To wow him with his skill and talent, a performance that would make Colin's boyfriend envious.

Frank stood up - he had already grown enough such that he could outstretch his arm straight up and just touch the ceiling of the office. A part of him wondered just how big he'd get as the growth spurt kept going, feeling like a low-grade orgasm every second. It's funny, with his strength, the issue with big jobs was never how durable the material was but the size, it was awkward to lift large objects. But he was slowly overcoming that problem.

Still coated in seed and Colin's pec sweat, the big canid swished up a load of dog cum, prepared to give Colin a fingering...

And with a big grin, decided to really have some dirty fun. He hauled Colin's hindquarters up to his muzzle, the younger collie taken back, and began to take cursory explorations of the tight fleshy pucker. The tricolour collie gasped. "Dad!"

"We're dogs, boy, relax and enjoy it." Frank pressed his strong tongue around and teased the entrance, Colin being pleasingly hygienic and growling and yelping to Frank's play. Finally, the big dog curled his big dollop of seminal "lube" onto two fingers and plunged in, causing Colin to yip. "Just loosening you up. I'm pretty big you know,"

"And getting bigger," Colin huffed, spilling beyond the desk more and more as he too continued to grow.

Finally, Frank was ready. He brought Colin to shaft level, and as the younger dog gripped the desk - crushing the lip without effort - Frank eased his red rocket in, each inch exploding with ecstasy as he prepared to show his son what an older dog can do.

Colin moaned, embarrassed by how whorish it sounded. Who'd have thought that the first person who would make him cry out like that would be his father? He was, bar none, the biggest man that fucked him. Not even toys were as big as him. Did they even make toys that big? Would they? None of that mattered now that he was getting the dicking of his life.

The feeling was unreal, like Frank was gentle but also stretching him farther than he ever thought possible. The sound of groans filled the air, first Colin, then the desk he was messily splayed out over. The tricolour collie's tongue lolled out of his mouth, unable to determine whether the growth spurt or getting impaled on the thickest log of dogmeat in the world felt better.

The two of them practically mirrored each other as they grew, both of them staying the same height as each other, both of them filling out their torsos, arms, then legs in that order, both of their red rockets engorging with meat. Had Frank not had salt-and-pepper spots in his fur, one could potentially mistake them for brothers, or even twins!

Eventually the desk gave way, but neither of them cared. All that mattered was getting off and getting bigger. Together.

Frank was giving his son everything he had to offer. He was pretty sure this was enough force to smash a wall down in one thrust, but Colin liked it. Or rather, he didn't just like it - he was spewing pre all over the place like a leaky fire hydrant.

"Damn, boy, you bring out something in your old man," Frank huffed, his entire body tense as his thrusts turned manic. The younger collie was tense as well, every vein tight to his pelt, some as thick as co-axial cables.

"Fuck, I'm close!" Colin howled.

Frank was a little embarrassed, but that did it for him. He let out a sonorous yowl as his balls exploded, the extra pressure from his semen-engorged shaft tipping Colin over the edge as well. Cum exploded everywhere. On the ceiling, on their bodies, pouring out of Colin's ass as Frank pulled back with a loud schlurp. They quite possibly had the longest orgasms ever known to man, and by the time they tapered off several minutes later, the floor was ankle deep in dog spunk.

Winded, Colin clumsily lifted himself off the table and to his feet. The ceiling audibly groaned as the top of his head brushed against it. It was then that Frank realized he was only half a head shorter, the room practically a cage for the two behemoths. "Damn, boy, you're a giant," Frank whistled.

Colin flexed his muscles. "In more ways than one," he chuckled. There was possibly no one as overmuscled as the younger collie, he appeared the epitome of strength, and Frank, truth be told, didn't appear to be far behind in that regard. The mood between them stayed pretty elevated until a frown crossed Colin's face.

"Uh oh," Frank noticed the changing expression on his son's face, "what's up?"

"It's just," Colin rubbed the back of his colossally huge neck, his traps nearly reaching the bottom of his ears, "I dunno, we kinda just outgrew a lot of what we needed to do our work here. For starters, your office is way the hell too small for you now. Also, there's our uniforms-"

"Eh, don't worry about any of that stuff." Frank dismissed the younger dog's concerns. "That's nothing Mike can't take care of."

Colin pursed his lips, still seemingly having something niggling at him. "Well, it also throws a giant wrench into my studies. How am I gonna explain what happened to my supervisor?"

Frank thought deeply about it before he came up with a solution, a sly grin slithering across his muzzle. "Perhaps he'd enjoy a hands-on demonstration."