FSE

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"Damn, dude, your dad lives here?" Darren gawked at the multimillion-dollar mansion he was pulling up to in his brand new, black pickup truck. The otter was well passed bodybuilder-sized, stretching out the grey muscle shirt and red basketball shorts he had on, though the cerulean speedo holding his junk in place was doing a bang-up job staying intact. He leaned on the open driver-side window with a beefy arm to get a better look.

"Well, it's not like he owns the place," Colin retorted, leaning forward slightly so he could see out the same window past his muscleott boyfriend. He was huge, like Darren, though his belly pooched out a bit, not from any chub, but from so much muscle packed into his abs that they had no other choice but to form into a tortoise shell of a gut. He was also less showy than the otter, instead opting for a navy band t-shirt and a pair of grey sweatpants. "My stepdad's the one who bought it."

"I mean, they're married, right?" Darren turns to face the collie hunk. "It's not like it changes his living arrangements."

"I know, you just made it sound like it's in his name." The dog unbuckled and shifted in his seat to better see the mustelid. "Regardless, yes, this is where he lives and where I'll be spending the weekend."

"Well you certainly could do worse, that's for sure!" Darren chuckled. "Kinda makes our place look like shit in comparison."

"Hey, we're doing well for ourselves. We don't need that kinda money to live comfortably."

"I know, I know," The otter put up his mitts in defence. "It's just that looking at a place like that makes you wonder what being that rich is like. I mean, we're in a gated community right now. What are they trying to protect themselves from?"

"Riff raff like us," Colin snickered at the muscle slinky.

"Hey, we're not that bad. I mean, we're both college educated."

"Dude," the collie tried to suppress a laugh into his fist, "you literally shredded your gym shorts doing squats yesterday."

"Ugh, the one day I thought it would be okay to go commando..." Darren tried to hide his face in his hands, his cheeks rosy from embarrassment.

"Sergei looked ready to whoop your ass," the laugh escaped Colin's mouth despite his best efforts.

"And I apologised profusely!" Darren raised his voice in an attempt to defend himself. "You know, I think your 'Canadian-ness' is rubbing off on me."

"That's great! Now I can take you back home to Ottawa and you'll fit right in." The tricolour dog firmly grasped the otter's meaty shoulder.

"Sounds fun. How many coats should I pack?" Darren's words dripped with sarcasm.

"Hey genius, it's the middle of summer right now. You'd sweat your balls off as is."

"I'm surprised all the buildings don't melt from the heat." The word reminded the mustelid to turn the air conditioning a little higher.

"If they did, you'd hear about how the country flooded every time it hit zero degrees."

Darren sighed. "You and your precious 'Celsius'."

"Hey now, you got to see how useful it is in biochem."

"I know, I know," Darren brushed off the dog's remark, "it's just still weird to use it after a lifetime of not." He looked back at the mansion, a sense of longing in his gaze. "Still would be nice to afford something like this."

"Eh, I wouldn't sweat it," Colin patted the titanic otter's shoulder, "this is all for show. It's just a status symbol, kinda like your truck."

Darren whipped his head around to meet Colin's gaze. "What the hell are you talking about?"

Colin guffawed. "I mean, you literally just got this truck last week and you've been driving all over town like you wanna show it off."

"I had to! I'm a growing boy and my old car was starting to not be able to hold my bulk anymore."

"You couldn't adjust your car at all to accommodate you?"

"Nah," Darren shook his head, "nothing I could do there. Damn, I really miss that hatchback. We went through a lot together."

"Still think you went in a weird direction with the colour of the truck. Your car was orange, which is definitely a 'you' colour, but black?"

Darren chuckled at the humongous collie's observation. "Hey, I'll have you know that my truck reflects the colour of my soul."

Colin let out a mirthful laugh. "I wouldn't have pegged you as having an emo phase."

"Hey, just because mine only lasted a month and a half doesn't mean it didn't happen." Darren playfully punched the tricolour dog's muscular arm. "Long hair really doesn't suit me at all."

"Oh, I would kill to see a picture of you from then!" Colin could only imagine what a pouty teenage Darren would look like. "So where are you off to this weekend?"

Darren shook his head in annoyance. "Atlanta."

This took Colin by surprise. "The hell? That's way out of your guys' jurisdiction."

"Yup, well, there's been a ton of new cases popping up and the guys over on the east coast are swamped and need help."

"But aren't you a lab tech?" Colin cocked an eyebrow. "I thought only the field agents had to do that stuff."

Darren shrugged his boulder shoulders. "It's not the first time I've had to go out on a mission." He cracked a grin at an assignment he had before. "I don't think I told you about it, but I got to be a two-ton otter a few weeks ago."

"Hot." Colin smirked, feeling a stirring in his crotch.

"But yeah, each facility is due for some new hires. We're a bit stretched thin right now."

"Cue all the frat bros lining up to get a chance at a sweet government job." Colin rolled his eyes.

This caused Darren to burst out laughing. "Dude, you actually have to know the science to get the position. That alone cuts down that list by ninety-nine percent."

"All the agents know their stuff? Andy and Ty included?"

"Andy's solid." Darren nodded his head. "He knows what he's doing. I can count on him. Ty's not entirely sure of it, but he's got a sharp enough mind to work on the fly. He's got a good head on his shoulders."

"And between his legs." Colin shot the otter a knowing glance, a smirk growing on his face.

"That he does," Darren chuckled, reminded of the times when the two of them found some private time at work. One time the thick pitbull had snuck up on him while he was working himself with his personal milker that the facility supplied to all their staff. He quickly lubed up the otter's hole and plunged his fat dick balls deep, eliciting a needy mewl from Darren. The gargantuan slinky couldn't do anything since his cock and balls were in use with the machine, so all he could do was let Ty have his way with him. Several moments of ferocious fucking had the two of them blowing their loads, Darren into a cum receptacle and Ty into a beefy otter ass. Darren could've said something, and would've, had he not totally done the same thing to the dog the day before.

"So you're okay with this weekend then?" Colin wanted to make sure that his boyfriend was still comfortable with his working conditions.

"Yeah, I'll make this work." Darren perked up a little at a sudden thought. "I'll be flying first-class for the first time in my life, so that'll be exciting!"

"Oh, there you go! Things are looking better already!"

"It's about the only thing I'm looking forward to this weekend." Darren snickered.

Colin glanced over at the clock, noting how long the two of them had been talking. "I should probably start heading inside. You're burning gas just idling here."

"Gimme a kiss first," Darren pulled the tricolour collie in and passionately frenched him, the two muscular animal men feeling each other up. Darren suddenly jolted up and broke off the embrace when he felt the dog fondling his sizable junk. "Hey, hey, hey! Anywhere but there!"

"Thought I'd give you something to remember me by." Colin mischievously winked at the mustelid.

"Goddamn it, Colin..." The otter then felt his prodigious erection creeping up past the elastic band of his shorts, nestling in between his enormous torso and muscle shirt before reaching full mast. The entire thing looked obscene, it made his clothes look like they were painted on.

"Better head over to the facility and empty those balls!" Colin quickly opened the door, jumped outside, and closed the door in one quick motion. "Love you, bye!" He called through the open window and started jogging past the car up into the walkway heading to the front door. He heard the squealing of tires behind him. The dog smirked knowing he set the otter on a pretty short timer.

Colin ambled up the footpath, marveling at how well kept the property was. Hedges were trimmed, with some shaped to resemble animals, grass was maintained to a certain length... a lot of work went into keeping this place looking tip top, though he found it a bit confusing that people would go to all that trouble for something that would be seen by very few people. Coming out of his thought, he found himself flanked by a pair of tall, ornate, marble fountains. Experience with simulation video games reminded him just how expensive decorative lawn elements like those could truly be.

Colin stopped when he reached the stone steps that led to the landing where the front door was located. He had to crane his neck to truly take in the size of the mansion he was about to spend a couple days in. At first, he'd say it was huge if he were to look at a picture of it but seeing it in person reminded him that it wasn't just big, it was fuckhuge. It looked bigger than six or seven of the frat houses, but the collie knew it could effortlessly the hold the members of double that amount. It was almost too much to take in, but he pressed onward.

Colin made his way into the front foyer and locked the door behind him, his dad letting him know ahead of time that the door was unlocked for him. He slipped off his runners and made his way into the house proper, stopping when he got to the twin staircases that led upstairs. Both paths led to the upper part of the expansive house, which, coupled with all the hallways on the ground floor as well as the basement floor, meant his dad could be anything in the mansion. He was about to pull out his phone and text his dad to see where he could possibly be, but the smell of food suddenly wafting past his nose gave him a clue to his father's whereabouts.

Colin wandered into the kitchen where he saw his dad sitting down at a small table, at least it looked small compared to the room it was in. Truthfully, it looked like the size of the table that he and Darren had in their apartment, except that was where they ate their dinner, while the table Frank and his husband would normally eat at dwarfed it entirely.

Frank looked up when he saw movement out of the corner of his eye, his face lighting up when he saw his son. "Hey, you made it! Oh, and look how much you've grown!"

"Yeah, just got here." Colin took a seat across from his father. "And you say that every time you see me." The first thing he noticed about the older collie was that, while he was wearing a cute apron, he was totally topless. It left his dad's sumptuous arms perfectly on display, as well as giving Colin ample opportunity to ogle those shirt busting slabs of meat he called pectorals, though he held off since he knew that he'd get that opportunity later.

"Hadn't heard anything from you, so I was gonna give it another ten minutes before I called you." He folded up the newspaper he had been reading so that he could give his son his full attention. "You get here alright?"

"Yeah, Darren dropped me off."

"What's he up to this weekend?" Frank's fluffy, sweat-matted merle coat shone in the artificial light of the room. The younger collie knew his dad was busy preparing food, but the air conditioning was on, so he figured it must've just kicked in.

Colin leaned back in his chair, putting his chest on full display. He saw his father momentarily glance at it. "Work trip on the other side of the country."

Frank cocked his head at the statement. "I didn't think he had to do work out there."

"He doesn't normally," Colin explained, gesturing with his hands, "but the folks over there are a bit understaffed at the moment so he was forced to step in and help."

"Huh." Frank shrugged, not knowing enough about what the otter does for work to comment further. "Well, I know you two are close. Think he can manage a weekend without you."

Colin slyly grinned. "Don't worry about him, I left my gym bag in the back seat of his truck next to his suitcase. I'm sure he'll find it."

Frank chortled. "Oh you kids."

"Where's Mike this weekend? I remember you saying he wasn't gonna be here."

"Funnily enough, Mike's also at on a work trip, though he'll be gone a bit longer than we initially thought." Frank nodded his head. "First time he's been to New York in a long time and it's the first trip he's taken without me since we got married."

"He'll probably need to empty his balls into some pretty, young thing." Colin snickered.

"No, no," Frank shook his head then gave the younger collie a disapproving stare, "that's not his M. O. That wolf is one hundred percent optics driven. He can't have anything negative like that taint his image."

The remark left Colin genuinely astonished. "Well colour me surprised then. Considering his sons, I'd have pegged him someone who'd chase tail no matter where he went."

"Ah, no," Frank dismissed the thought with his hand, "he might've eased up on a lot of things since we formally met, but his reputation is still really, vitally important to him."

Colin accepted the answer and wasn't going to prod any further. It was just then when he realized just how quiet the house was. Besides the sound of the ovens running (his dad four ovens going at once?) and the two of them talking, there didn't seem to be any other commotion in the mansion at all. Colin sat up so he could swivel around to try and hear noise better. "Hey, are your guys' staff here at all?"

"Nah, I let them have the weekend off. I actually gave them as long as Mikhail was gone for. I told them I'm a grown man and I can take care of myself, but they all insisted that they come back at the start of the week. I was trying to do a nice thing, but whatever." Frank then threw his hands up in celebration. "But that means we have this entire place to ourselves for the weekend!"

Colin smiled coyly, that was a relief to hear. "I'm looking forward to that for sure. We're not gonna use every room in this place anyway so I'm sure we'll be fine."

"Oh, for sure." Frank finally leaned back in his chair, exposing his musky pits to the air. "There are places in here I've never even set foot into. Did you know we have ten bathrooms here?"

Colin was taken aback by that. "Uh... I'm fine with one, thanks."

"Me too. The rest just gets to be too much." Frank sighed, leaning his elbow on the table, and resting his head on his hand. "I think I was happier living in the house you and I lived in, but I can make it work here."

"What about Mike?"

"Loves it." Frank emphasized his point using hand gestures. "He specifically bought this place because of how big it is. I regularly use, maybe, ten percent of all rooms here."

"I'm guessing the gym is one of them." Colin sleazily grinned, eyeing up his dad's body.

"Honestly, not really. That's pretty much Mike's domain."

"Then I know exactly where you got your size from." Save for fur colour and the glasses the merle collie wore, Colin and his father looked incredibly similar to each other, down to the abgut they both sported. "Apple fell as close to the tree as it possibly could."

"I'm glad to hear that." Frank cheerfully chuckled. "Say, why don't you tell me what you guys are working on at school."

"Oh, uh," Colin looked around the room momentarily in an attempt to jog his memory. "we've actually got a couple projects on the go right now. You know, we got stuff somewhat related to what Darren's working on in his lab at the facility, I think that much you've heard before. We are working on one that we think is pretty important." He leaned forward in his seat, both elbows now on the table. "So what we're trying to look at is a way to allow these super buff guys to retain flexibility when they normally wouldn't. We're messing around with the bodily interactions related to muscle flexion and extension and whatnot. We think we have an idea of how we can tackle it, which is good 'cause..." Colin pursed his lips, a bit of a worried expression crossed his face. "Hoo boy, Xavier needs it."

"Oh?" Frank cocked his head at the remark.

"Yeah." Colin sighed in uneasiness at the thought of his civet friend's predicament. "So, since we started this program, we've both been growing like weeds. It's to the point where we're both outweighing, let's say, seasoned heavyweight bodybuilders, if you can get an idea of how big that is."

"Uh," Frank scratched his enormous neck, trying to make a mental image, "I don't have a whole lot of experience in that field, but I think I know what you're talking about when I look at you."

"Ok good. So you know how I'm 6'4"? Well, Xavier's 5'6". Neither of us are stopping anytime soon, either."

"Holy shit!" Frank blurted out in genuine amazement. It was rare for the elder collie to swear, so this was something special. "I'm glad I wasn't drinking anything just now."

"Yeah..." Colin rubbed the back of his bull neck. "'Manlet Hercules' is what Tim calls him, though I don't think he minds at all. Honestly, I think he relishes the nickname." He had to snicker at something he just remembered. "So, uh, yeah, what he lacks in height he more than makes up for in width and thickness. We were in Tim's office the other day he was kinda getting into it with Tim. Well, long story short, he ends up crushing Tim's desk beneath his pecs."

"Sounds pretty serious. Everyone was alright?"

"Yeah, we were all just a little stunned at what just happened, Tim included. If you were to ask him, Xavier would try to play it off like he meant to do that, but he looked like he feared for his life when it happened." Colin fidgets with his fingers. "Tim's not the type of person who takes the destruction of school property very lightly, but he just called for a replacement desk and that was that. Other than that, Tim's pretty open with us." He shot his gaze over to his father, giving him a knowing look. "He's taught us a lot of things over the years. He's pretty experienced, I'd say."

"Oh, really?" Frank leered at his son.

"Yeah," Colin locked eyes with his muscled dad, "I might have to give you a crash course in some of the things I've learned."

Frank leaned both elbows on the table, resting his head on his meshed fingers. "So you two are pretty intimate then?"

"In our lab, at least. I honestly wouldn't have been had Xavier not told me that he and Tim were going at it." Colin wore a lecherous on his face. "The rat has an insatiable thirst for bigger guys. Like, yeah, he likes being the one on top, but lately he's been letting us get a lot handsier with him. He probably wouldn't admit it, but I think he loves being manhandled."

"I assume this is all for research purposes?"

"Oh, a hundred percent." Colin let out a belly laugh, slamming his open hand on the table. "We're studying the effects of cornering a rat with 675 lbs. of collie beef." He felt his monolithic prick fatten in his sweats. "He gets pretty flush in the face when I push my pecs onto him, might be the heat from all the fur I'm covered in."

"Oh, it's heat, alright." Frank chuckled as he leaned a meaty arm against the back of his chair.

"All I have to do is press each of my hands against the wall beside his head and he knows he's trapped. It's not like he hates it, mind you. The way he grinds against me as we kiss would make you think he's the one that started it." Colin snickered. "He likes to feel me up and say that he's 'taking my measurements', but I know he just likes the way my body feels. Honestly, I just think that I remind him of his husband."

"Oh, he's a dog too?"

"He's actually also a collie, believe it or not! I'm met Walt a handful of times, he's a pretty cool guy." He strokes himself through the fabric of his pants as he reminisces on when the two of them double-teamed Tim in their house.

"Now you've got my attention!" Frank clasped his hands together.

"Yeah, he's bicolour - black and white."

"Know where his local haunts are?" Frank's chub was plumping imagining his son's exploits. "I think I'd like to meet him."

"Oh, you know, kinda the same as you. Pubs and whatnot. Oh, and he also like rock music as well, though he rides a motorcycle so he's probably too cool for you."

"Excuse me?" Frank exclaimed in faux outrage, crossing his arms along his gargantuan barrel chest.

"Kidding!" Colin hadn't giggled like this in a while. It was good to catch up with dad every once in a while. "I honestly think Tim's gonna try and beef him up. I happened to see notes on his desks detailing how he's gonna do it, except he's really going all out. The final weight I think is somewhere past a half ton. Tim wants to dick down a collie more than double his size."

"Surprised he hasn't tried it with you yet."

"Might have to do with the testing we already do." Colin scratched at the underside of his chin. "I'm guessing he doesn't want to mess with the results we're expecting with the sera we create in the lab. You, on the other hand, might want to be careful. There's no telling what might happen if you two were to meet."

"I think I can handle myself, Colin." Frank shot the younger collie stud a confident smirk. "He may have a doctorate, but I have several decades of experience on him. I doubt he knows how to please both men and women!"

Colin chortled at his father's boldness. "Nope, you've got him beat there. He probably also doesn't know the best words to say to get someone in the mood."

"If you can do that, you definitely inherited that from me. I've got quite the silver tongue in that regard."

"A tongue I'm well acquainted with." Colin leaned as forward onto the table as he could, a sultry twinkle in his eyes.

"More than most people." Frank reciprocated the look, then looked over his shoulder at the ovens. "Gimme a sec, I gotta check on our dinner."

"What's cooking?" Colin snuffed the air, trying to distinguish what his dad was making.

"I figured we'd need a lot of food between the both of us, so I went and found the biggest things I could find and that happened to be turkeys." Frank stood up and walked over to the ovens built into the wall, shocking Colin at the same time. Unbeknownst to the tricolour collie, Frank wasn't just not wearing a shirt. He also wasn't wearing pants, shorts, pajamas, or even underwear! The merle collie's bare ass was just hanging out in the open air, waiting for the world to notice. Lucky for him, Colin noticed. "I hadn't spatchcocked a turkey in a while since the chef usually does it." He chuckled to himself. "Spatchcock, what a funny word."

Colin's red rocket shot up instantly, pushing past the elastic of his sweatpants and hitting the underside of the table. He got up that moment, pushing his chair back as quickly as he could. His cock was already drooling rivulets of pre, the lust he was feeling was uncontrollable. He made his way over to his dad just as the elder dog was inspecting the last bird and wrapped his arms around him. He groped at the fat nub of flesh that was Frank's nipple, forced to point down due to the sheer enormity of his pectorals, and grinded his cock into the small of his back. The blueish coat was getting slicked with Colin's pre, not that his dad minded.

"See something you like?" Frank cheekily asked, his own red rocket plumping up effortlessly.

"I'm sorry, it's just been too long since we've done this." Colin slowly humped his shaft against his father's back. "I really wanna bury my bone in you right now."

Frank shuddered as he felt the colossal log of dogmeat begin to hotdog his ample, muscled rear. "I wouldn't mind that but let me take the lead." He flipped around to face his son and pushed him backwards until he hit the nearby wall, leaving a small crack in the drywall. He forced his snout against the tricolour collie's, his tongue penetrating through and mingling with Colin's. Their fiery embrace was peppered with breathy moans, mostly on the part of Colin who was feeling particularly overwhelmed.

"Dad," Colin whined as the older collie kept up his oral assault, "please, my dick-"

Frank pressed forward so much that Colin couldn't get another word in edgewise. He traced the length of Colin's cock and stopped only when he got to the top, grabbing the pre-smeared tip. He then broke off the kiss and shook his head. "No, not here. Upstairs, now." He hastily made his way to the staircase adjacent to the kitchen and ascended like a shot, with Colin right behind, just as eager. He pulled his son into the master bedroom, stripping him entirely before taking the apron off of himself. He then resumed the embrace, if only for a few seconds before the younger collie stopped him.

"Wait!" Colin shouted, barely able to push his dad off of him. "What the hell are we standing on?" He wiggled his toes on the familiar, but out-of-place material.

"Oh," Frank stumbled backwards, "check it out."

Colin finally got a chance to look at the floor, completely confused by what he saw. "This looks like the padding at the gym..."

"It's the same stuff." Frank explained. "Mike and I realized how annoying it was to clean cum out of carpet, so we had it replaced with the padding. And look at the center of the room."

Colin did as he was instructed, nearly double taking when he saw what his dad was gesturing to. "You have a drain in your floor?"

"Yeah, this way it's easier to get rid of." Frank panted, hormones raging through his body. "We wanted someway to help the cleaning staff, and this is what we came up with."

Colin covered his mouth to try and stop a laugh but failed. "Man, I think I can honestly say that I'm jealous."

Frank then grabbed at Colin and pulled him against his fluffy, behemothian body, this time kissing at his beefy neck as he whispered into his son's ear. "I lied earlier. Mike won't fuck just any little guy, but he will absolutely make an exception for his sons."

Colin could see George being okay with it, but his brother was another story. "Even Jared?"

"Especially Jared. That charcoal grey wolf of mine loves tapping that ass. It gets to the point where we aren't sure if Jared's white from his fur or the cum he's covered in."

Colin reached out in front of him and grabbed the first thing he could, that being his father's enormous pecs. They barely budged in his grip, he could feel the strength of that chest under the thin pelt. "But Jared always acts like he runs the place whenever he's with us. Why is he different here?"

"Because he's not in charge here," Frank maliciously chuckles, "we are. He does what he's told, simple as. We do let him top once in a while just to placate his needs, but other than that he sits on our dicks."

"And George?"

"George is a total sweetheart," Frank shuddered as the tricolour collie found purchase on his meaty nipples, "he's more of a romantic than his brother. Plus, he can talk to me about his work since I can understand what he's talking about." He reaches around and feels up his son's mountainous back muscles. "But neither of them riles me up like you do."

"I think it's the blood relation." Colin moaned as he got a face full of his father's fluffy neck fur, inhaling his heady musk right into his brain.

"Yeah, my blood runs through your veins. We share the same hormones."

"Not quite," Colin chortled, "but I get what you mean."

"God, come here." Frank pulled Colin towards the bed with him taking a seat on it, his shaft staring straight up at the younger collie. "Help your old man out, would you?"

Colin licked his lips with anticipation. "With pleasure!" He dropped to his knees and grasped the thick pole, needing both hands to fully grip its circumference. The tricolour dog slavishly ran his tongue up the length of his dad's pupmaker, savouring the taste of the pre that was dribbling from his cockhead. Once he felt that he had licked every part of that veiny surface, he then kissed the tip of his father's dick before taking the entire thing into his mouth, the tip tickling the back of his throat. Colin's nose ended up being buried his dad's musky pubic bush, the masculine scent of the older canine burned his nostrils.

"Fuck, Colin," Frank moaned out, gripping the sheets he was sitting on with ferocity, "not many people are able to take me to hilt. Good job."

Colin didn't respond, he couldn't with that monster taking up almost all the room in his mouth. Slowly he began to rock back and forth, moving his mouth up and down the shaft. He built up a rhythm that got his dad growling with pleasure, a sign that told him to keep going.

"Fuck, this family has a lot of talented cocksuckers." Frank ruffled the hair of the younger collie, pride welling up inside him as he watched his pride and joy slaver over his dogmeat. He was grateful that the two of them got to spend quality time like this together, though they never used to interact like this before. Once they had both moved to California and blew up size did they finally start seeing the other as a sexual partner, something they didn't aim on stopping anytime soon.

Numerous blowjob sessions with Tim, where the rat either gave or received, endowed Colin with several ideas of how to get a man to blow with little effort required. He wagered that if those kinds of techniques would work with the Timtanic, then they could work the same on his dad. He carefully brought his fingers to the inside of the elder dog's tremendous thighs and gently ran his fingers along them, the act getting the merle collie to start huffing from the euphoria suddenly thrust upon him.

"Shit!" Frank cried out, his son's ministrations clearly having an effect on him. "You're better than I gave you credit for." He gave off a decidedly whorish moan before his arms buckled, his chiseled back falling onto the bed.

That caused Colin to smirk slightly, redoubling his efforts in making his dad cum. He moved one hand to the other dog's prodigious testicles, balls so big he could cup one in his hand. Those plump testosterone factories roiled with seed, a testament to the elder collie's virility. Colin traced the vein that snaked across his father's ballsac with a fingernail, thinking of how the merle collie's junk would be the envy of any beefy hunk in the area.

Frank groaned, his entire body tensing as his son continued with his oral onslaught. "Keep going," he wailed between panting breaths, "I'm close. Oh God, I love you Colin!"

Colin bobbed faster on his father's shaft, as if his life depended on it. Het let his fingers wander some more, this time ending up by the older canine's pucker. Due to only discovering men much later in his life than Colin, Frank was pretty inexperienced with using his backdoor, which was something Colin could use to his advantage. He outlined the ring of muscle with a claw, making his dad whimper like a dog in heat waiting to be bred.

Frank palmed his face with a hand, somewhat embarrassed at how needy this was making him feel. "Shit, alright, you know what you're doing." He whined out loud. Whether driven by instinct or lust, he grabbed a hold of the back of his son's head and held it to the base of his shaft. "That's it I'm cumming!" He howled in the direction of the ceiling, his voice thundering enough to arouse anyone from sleep had someone else actually been there besides them.

This caught Colin off-guard as he wasn't expecting his dad's release to happen so suddenly. He found his nose shoved, once again, into the merle collie's pubes, the incredibly masculine, earthy musk invaded his nose, imprinting itself onto his brain. A momentary liberation from the overwhelmingly powerful scent of his father allowed him to formulate a plan, one he put into action in an instant. He clamped his lips down right where the cockflesh met the older dog's well-defined pelvis, forming a tight seal that wouldn't allow any jism to escape. Then, once the floodgates opened, he opened his throat to allow the spunk to flow directly into his gullet. He made sure to take careful, deliberate breaths through his nose to avoid anything going wrong, but the whiffs he took from the pubic bush threatened to make him lose control. He held on as best he could, not allowing a single drop of seed to breach the security of his lips. Once Colin was sure the final ropes of cum had been shot into him, he let go of his dad's dick and fell backwards, collapsing onto the padded floor ass first.

"Hot damn," Frank gave a wheezy chuckle, "you really know what you're doing, kiddo." He let his arms flop back against the pillows, ones not anywhere near as stuffed as his impressive pectorals. Basking in his afterglow, he felt his erection flag, draping itself along his gigantic thigh. That moment was when the warmth he experienced after every orgasm blanketed itself across his body. Every muscle on his body subtly grew bigger, as if he were flexing them but they retained their size. The sensation of his muscle fibres tearing themselves apart and repairing right away was euphoric in and of itself, second only to when he gets to check out his new, bigger size. "Yeah, that's the ticket." Frank could feel the fiery wave of stimulation begin to subside, though his excitement never wavered. He latched one hand onto the opposite arm, feeling the sinewy bulk of his split-peak bicep in his grasp as he flexed it. Pushing himself upright, he called out to his son. "Hey Col, check out your old man now!" He gasped when he finally saw the younger dog, genuinely shocked at what he saw.

Colin, like his dad, was also going through a growth spurt, but unlike his dad it was due to all the cum he guzzled down. His already plump pecs pushed out even further, his titanic traps rose ever higher, his cannonball-like shoulders rounded out further, and his sumptuous arms taking up even more space. His muscled dome of a gut pooched out further with unbridled core strength, his tree trunk-like legs ever closer to resembling redwoods, his dimpled ass able to squeeze the hell out of any dick he takes, and his monumental cock and balls bloated to the point where his shaft could curve around belly while his testicles were comparable to watermelons.

"Colin?.." Frank looked on at his son's growth, half in awe, half in lust.

"Fuck..." Colin groaned, stumbling to at least get to his feet, let alone his hands and knees. Once he regained some semblance of control, he cast his glance up to where his father was a sitting, a smile widening across his face when he saw the merle collie. "Well that was fun." He cheerily noted.

"How... how did you do that?" Frank was absolutely dumbstruck.

"Oh, right." Colin clumsily got to his feet, taking a second to get accustomed to the new mass added to his already monstrous frame. "I noticed I was able to do it some time ago, so Tim agreed to monitor me. It only happens when I take in some other guy's cum, though we aren't sure why I'm able to absorb its essence and convert it to size. Funny thing is it doesn't matter which orifice I get dicked in, I grow all the same."

"You mean to tell me you're able to do that?"

"Oh yeah," Colin mirthfully chuckles, "oftentimes I'll have Darren plow me and then I'll return the favour once I grow."

"Sorry, you misunderstood me." Frank laughs. "What I meant to ask was, 'you're able to do that as well'?"

The realization of the question flabbergasted Colin, he thought he was alone. "You mean you-"

"Uh huh." Frank brought his arms in against his sides, proudly puffing out his chest. "I don't think there could be any doubt as to whether or not you are my son." He snickered, letting his boulder-crushing arms drop towards the bed from gravity. "Funnily enough, I do the same thing with Mikhail. He'll go nuts in the gym and push himself as hard as he possibly can and get his gains that way. Then all I have to do is let him fuck me a few times and I've caught right up. I'll fuck him one final time for good measure and end up bigger than him. It's a good system we have going."

"So two collies," Colin mused aloud, "each with two different ways of growing."

"Who'd have thought something that would've gotten passed down."

"Well, we in our program have been looking at the barbarian gene present in men to determine what kind of genetic anomalies they could have." Colin explained. "Some people have an innate ability related to their gene, which we've since dubbed a 'barbarian power'."

"So for two people to share the same abilities-"

"One hundred percent unheard of." Colin shook his head. "Through work done by Darren's employer, as well as our own research, we're aware of, I think, almost eighty-five different abilities related to these men's barbarian genes."

"Alright," Frank nodded along, "I think I'm starting to get what your saying. So then what happened with us?"

Colin pursed his lips, sighing frustratedly through his nostrils. "That I'm not sure about. However, I have a couple hypotheses. The first," he held up a finger, "is that, because of all the testing I've been subjected to, there may be a chance that my DNA has become malleable enough to receive a different person's ability and transmit my own. The only problem I can think of is that Tim would definitely be observant enough to notice an irregularity like that in my genome and would've worked tirelessly to undo the changes that would've led me to that state in the first place. It's not exactly the best state of body to be in."

"Okay," Frank took a second to absorb all that information, "so what else could it be?"

"My second guess," Colin hesitated for a moment, "is it's due to our familial relation when we have sex. I think there might be a chance that we could passed on our powers to each other without either of us knowing. It feels like it had a smaller chance of happening but is somehow simultaneously the stronger theory."

"Okay." Frank sat there and took in everything the tricolour collie told him. "What do we do next then?"

"Next step is testing. Once Tim hears about this, he's gonna wanna examine us himself." Despite what he was saying, Colin cracked a smile that stretch from ear to ear. "But it's the weekend, let's give him some time to relax and unwind."

Frank reciprocated the smile his son wore. "And give him a heart attack come Monday?"

"I like to think of it as a pleasant surprise." He mischievously chuckled. "Now come on, I haven't gotten off yet."

"Alright! So what did you have in mind then?"

Colin brought his hand to his chin and thought about it for a moment. "You know what, you're actually perfect where you are. I just wanna..." He reached forward to his father's overly stuffed pecs and pushed the elder dog backwards, so he was laying on his back again.

"Oh, I see." Frank huffed, electricity shooting through his body as he envisioned what the younger collie was about to do to him. "Just take it easy, eh? You'd be the biggest person I've ever taken."

"I won't do anything if you tell me not to." Colin reassured his father. "Hmm, before I do anything..." He bent down so that his face was level with the merle collie's crotch. From there, he grabbed a blueish, behemothian thigh with each hand and raises them effortlessly into the air.

"Woah!" Frank was momentarily caught off guard.

"Just relax, let me handle things. I've done this a hundred times before." Colin cooed, advancing his face forward until his muzzle contacted his father's anus. He then pressed his tongue against the fleshy ring, savouring the intoxicatingly male taste, before pushing past it into the older collie's anal cavity.

"Ooh!" Frank moaned out, overcome with intense emotion. He had one hand draped over the boulder he called a pectoral that he couldn't move due to his nerves positively melting from the sheer pleasure. "I've never done this before. This is intense!"

The comment made Colin pull out of his dad for a moment, chuckling at the other dog's inexperience. "You've never been rimmed before?"

"No, never." Frank wheezed, his entire nervous system shot. "I'll have to show this to Mike when he gets back home."

Colin smirked, it sounds like something he could teach his dads. "It seems to be something canines enjoy, so I think Mike will love it. Everyone else, however, gets fidgety when they have it done to them." Colin tried to suppress a laugh. "Darren gets really squirmy whenever I tried to do it to him, as well as some of the other guys we know. It's pretty funny when these 'big strong beefcakes' get all squeamish when you even suggest it to them."

"Well don't let me stop you, I'm all game for this!"

With his father's blessing, Colin continued. He didn't stop until he thought he got the area sufficiently slobbered and then stood up. "Are you ready for what's coming next?"

"Ready?" Frank huffed, his frayed nerves finally feeling somewhat normal again. "You mean there's more?"

Colin has to laugh at his father's innocence. "Oh dad, that was just the warmup." He tugged on his pupmaker with it drooling copious amounts of pre down its length. "This right here is the main attraction."

"Don't let me slow you down then." Frank steeled himself for the penetration that was to come. "Go on and stick it in me already."

Colin nodded and lined his titanic tool up with his dad's tailhole, smearing pre all over the slicked pucker. "Oh, it's a bit slipperier than I was anticipating." He eventually found purchase and was able to slide right in the merle collie's rectal cavity.

"Yes! YES!" Frank cried out, savouring the sensation of getting stuffed with that fat log of dogmeat. "You're so big!"

"Does it hurt at all?" Colin felt his heart skip a beat, the last thing he wanted was for his dad to be in pain.

"Fuck no, keep going!" Frank giggled, his rosy cheeks signalling his slight embarrassment from the situation.

Colin did as he was instructed, pressing forth until the entirety of his veiny schlong was jammed inside his father's asshole. "Holy shit. I'm in, but you're hella tight."

"How about now?" Frank sneakily sniggered, clamping his anal muscles down around his son's prodigious prick.

"Mmph!" Colin snorted, his body flexing all over in response to the sudden stimulation on his dick. "Yep, that's even better." He took a deep breath to reset his body's tension. "Okay, here goes. Tell me if something's wrong." The tricolour collie slowly, but surely, pulled out of his dad until the tip remained inside, then went and slammed back in, going balls deep again. He then leaned further over the older canine, hands on the bed with his father's legs tucked under his armpits. It forced the merle collie's ass up slightly to allow Colin a better opportunity for his humping.

"Oh God!" Frank whimpered as he got speared on the younger dog's cock. "This is unreal. What do you call this?"

Colin once again laughed at his father's inexperience. "This is a mating press, dad."

"Aaah, yes!" Frank passionately cried out. "I'm surprising Mike with this. He's gonna love it!"

Colin chuckled as he continues plowing his dad, the older collie reminding him of a kindergartener showing their parents the picture they drew in class. He pistoned harder and faster into the elder dog's tailhole, aiming to show him a good time.

Frank was a hot mess of emotions, his mouth was wide open with his tongue lolling out. He was overcome with red hot euphoria from his prostate being flattened repeatedly as if were a pleasure button deep in his ass. His fingers twitched weakly, barely able to cling onto the bedsheets the two dogs were soiling from their lovemaking.

Colin quickened his pace, feeling a tingling in his taint which signalled that he was nearing release. He slammed his pelvis against his father's ass in a hastened rhythm, wanting to flood him with seed like he had been previously.

Frank, too, was feeling the effect of being near orgasm, his own red rocket having engorged with blood once again, veins snaked around it like it was a map of a city's streets. His moans cheered on his son, the two of them bucking in sync like they were mutually trying to get each other off.

Colin thrusted several times more until he felt his testosterone factories pull up, the telltale sign that he was about to blow. He pumped his hips a few times more until he howled in ecstasy as he shot his load like a firehose, right into the awaiting cavity of his father.

The feeling of the younger canine geysering his sperm into his asshole almost caused Frank to feel like he was having an out-of-body experience. Being filled with spunk to the point where his gut was bowing out slightly was enough to get him half-lidded, struggling to keep his eyes open. It also flipped the switch on his own orgasm, with the merle collie crying out as he shot his own load right at the wall above the headboard of the double king-sized bed he shared with his husband. The cum splattered away from where it hit the wall, dripping down to the matted floor.

Colin was nearing the end of his explosive orgasm, feeling like he was going to blackout from just how much energy he was exerting. A final pump of his shaft flagged the end to the sticky ropes of cum he could shove into his dad, his balls feeling the emptiest they had in a while. He panted, absolutely wiped from the frenzied fucking he gave the older dog. He still maintained his posture at least, giving him support for what's to come next. The blanketing warmth of growth was soon upon him, his muscles feeling relaxed before they started bulking themselves up. He looked up to see his dad, chuckling when he saw how out of it he was.

Frank nearly dropped into unconsciousness, never before had he been ravaged like that. His body held on admirably, a testament to the strength the merle collie possessed both figuratively and literally. He, too, felt the warm wave of a growth spurt coming, but he could tell right away that it felt more powerful than before. His hazy mind couldn't contemplate the reason why, until he remembered that, not only did he empty his balls all over the wall above him, but he also took in litres upon litres of jizz from his son.

Colin watched with giddy excitement as his father experienced his growth. He saw the speckled coat of the merle dog stretch to accommodate the incoming mass all over his body. He pecs positively surged with size, big enough to crush a steel I-beam between them. His arms themselves looked like they were made of steel cables, as did his astronomically huge quads. Frank's frame widened slightly to allow all the muscle to pile on him nicely, with his shoulders and traps rounding out thicker than they were before. His abgut grew bigger, taking up even more space and now competing with his bulky barrel chest. The last part that grew was his ass, and although it felt looser due to him growing bigger than Colin, the younger dog still felt it gain muscle like the rest of his body did. Looking down at himself, Colin saw that he wasn't as big as his dad was, but he was close behind with plenty of time to catch up and overtake him.

Frank gasped sharply as Colin pulled his dick out, his hole now feeling mighty empty. Surprisingly to the merle collie, there wasn't any cum trickling out like there sometime is when he takes it up the ass. He chalked it up to Colin keeping him plugged up so that he could absorb the essence of all the cum he was filled with.

Colin then clambered on the massive bed and laid down beside his father. The two of them had to manoeuvre a bit to get into a good position, but they were able to get their muzzles to meet for a kiss. It was rather weak as the two dogs were exhausted from their escapades, but it was every bit as passionate as every other time they did it.

Frank broke off the embrace, shifting his head back onto the pillow so that he could stare at the ceiling. "Holy fuck." He blurted out, blinking a few times as he felt his energy slowly returning to him.

"That's an understatement." Colin rubbed his eyes with the ball of one of his hands. "I think that was the most intense fuck I've had in my life."

"I'll say," Frank tried to move his mitt onto his son's arm but was unable to do so at the moment, "I think I grew more in forty-five minutes with you than I have in weeks with Mike."

"That's the power of family, I guess." Colin did the approximation of a shrug from his position.

"Something else for Tim to test for?" Frank feebly chuckled, shifting his head to face his son. He might worry that the sheer amount of muscle surrounding his neck would impede the movement of his head had he not grown a good half a foot over the course of this whole ordeal, putting him equal in height to his son, who also grew in height, at 6'8".

"Why stop there? He was looking to have his collie hubby be half a ton." Colin twists his neck to look at his dad. "Let's beat him to it and surpass it. He'll never see it coming."

"Would he be upset or cream his pants?" Frank wheezily chortled.

"Knowing Tim, first one, then the other." Colin smirked, knowing his prof would wants some 'hands-on' tests done by him personally. A moment passed before he spoke again. "Think you can go for round three?"

"Not me, not now." Frank shook his head. "I may have the body of a Greek god, but I'm a hell of a lot older than you are. I still wear out a lot easier than you do."

"Fair." Colin nodded. "What do you wanna do then?"

"Before anything else, I need food." Frank sounded like his mind was resolute. "The turkeys should be close to finishing. We can clean ourselves up and head down to the kitchen."

Colin was about to say something before his stomach interrupted him, grumbling at the lack of nourishment he'd had throughout the day. "You know what, food sounds good right about now."