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Max sighed, opening the front door to his house and loosening his tie as he finally got home from work. The big labrador retriever had gotten off work quite early, but it was still way into the afternoon when the cream-colored canine got to his house.

Max lived together with his son Aaron, who was a labrador like Max and had just turned 19 this summer. Aaron's mother and Max had been divorced ever since Aaron was three and from then until Aaron's teens, Max hadn't seen his son pretty much at all. Thus, he had been beyond overjoyed when two years ago Aaron had told him he wanted to stay with him since Max's house was closer to the university the younger labrador was attending. It had been a bit awkward at first, but nowadays Aaron and Max were pretty much like any normal father and son, and Max was more than happy to be a part of Aaron's life.

Stepping inside his house, Max's heart skipped a beat and his ears perked up as he heard the ominous, rapid creaking of bed strings coming from upstairs. The muffled sounds were soon followed by a moan, which most definitely belonged to Aaron. Swallowing hard, Max took off his suit jacket with trembling hands and tossed it onto the chair just inside the front door. Removing shoes from his paws as fast as possible, the big labrador started to sneak towards the stairs, listening to the erotic sounds coming from the floor above.

'...So today was the day huh...?" Max thought to himself, unsure of how he should feel as he quietly ascended the stairs onto the second floor.

There was actually something a bit more to the life-dynamic of Max and Aaron. They were neighbors with a big rottweiler named Jack, who was in a very similar life-situation to Max's. He too was a single father, who had a son the same age as Aaron, also a rottweiler, Jason. Jack hadn't even known he had a son up until three years ago when Jason had suddenly shown up on his doorstep and told him he was his son. Apparently, a one-night stand from his younger days had resulted in a child. Bit by bit, the straightforward rottweiler had gotten used to being a father and he also was on good terms with his offspring. And even physically, the two canine dads were very much alike, roughly about the same height, with Max maybe being somewhat heavier of the two. No doubt had the labrador been putting on a few extra pounds since his late thirties, and especially in the last eighteen months, his cream-colored belly had rounded up quite a lot. And since Jack worked in construction, it was really not a huge surprise he was a bit more fit than his neighbor, although, the big rottweiler had also been gathering a good start for his very own beer-gut.

Given the situation of both males, it had been easy for Max and Jack to become good friends, as well as Jason and Aaron. The two pups would often spend time at each other's houses, and sometimes even ate dinner next door. It was almost like both Jack and Max had one and a half sons each. Now, here was where it got complicated. After the nasty divorce from his mother, Max's son had been spending his early years almost completely without a father, deprived of any authoritative male figures in his life. Now, the young labrador craved for the attention of older males, maybe a bit too much actually. For some time now, Max had noticed Aaron stealing glances at Jack, and making an extra effort to talk to their rottweiler neighbor. At first, Max had just decided to ignore it, even up when it became very aggressive and flirtatious from Aaron's side.

Then, one night when Jack and Max were out drinking beer in Jack's back-yard, the candid, stone-faced rottweiler had said something about it to Max.

"I'm thinking of fucking your son." Jack had said, being very true to his straightforward nature, not even batting an eye while saying the absurd sentence out loud.

After Max had been done coughing out the beer from his throat, Jack had continued: "You know he also wants that, right?" To which, Max really had nothing to say. "Well...? Aren't you going to go ahead to try and stop me?" Jack had asked after a long silence in the darkening late summer night.

"...No..." Max had eventually replied. "You're both adults and... I should have nothing to say if you want to... want to..." Max couldn't bring himself to finish his sentence.

"But you actually do, don't you?"

"Well, yes because he... you.. and... all this.. and... This is all so complicated..." Max eventually sighed in defeat.

"Indeed it is... But you know how it was like to be nineteen. The kid wants to fuck! Better with me than with some random guy... right?" Jack had said, the serious expression on his face not wavering one bit.

"... I guess so..." Max had muttered and downed the rest of his beer.

"I just wanted to let you know, man-to-man before I really lose it and fuck his brains out one of these days. You got a hot son, Max."

And after some time Max had replied: "Just one thing though."

"Hmm?"

"Wear a condom, alright?"

"...No promises..."

Going through that conversation inside his head, Max took the final few steps to the second floor, the sound of the bedsprings and the moaning all the more prevalent now. His heart thumping rapidly in his furry chest, Max sneaked closer towards the door to Aaron's room, from which the sounds seemed to be originating. Carefully placing his big paw up against the wall, Max cracked the door open slightly while holding his breath. Peeking inside his son's room, Max saw Jack's big furry canine bottom repeatedly smashing against the squealing, smaller creature on the bed, which undoubtedly was Aaron. The dad labrador observed stunned how his neighbor's balls swung back and forth, slamming onto Aaron's bare behind while the huge rottweiler shaft was shoved inside the young labrador's stretched tailhole, Jack's massive knot threateningly bumping against the abused anus. Aaron's legs were loosely wrapped around Jack's lower body, as the two dogs made love in missionary, Jack's canine lovetool eliciting all sorts of horny gaps and moans from Max's son.

Unable to avert his gaze from the absurd scene unfolding before his eyes, Max stood still outside the door to his son's room, quietly watching how his son was getting it, and getting it good from the next-door rottweiler. Just then, by coincidence or not, Jack happened to glance over his bulky shoulder, noticing Max's figure in the doorway. The two dad's locked eyes for a split second, after which Jack gave his labrador neighbor a sly smirk. The big rottweiler then turned his face away from Max and proceeded to pound Aaron even harder, the young labrador's moans now clearly audible in the entire house.

Blushing and feeling a strange warmth washing over him all of the sudden, Max turned away from the door, quietly sneaking his way back downstairs, unable to get the image of Jack having rough anal sex with Aaron out of his head. Having tried to come to terms with all this, Max was still feeling rather uneasy about the whole thing. And that uneasy feeling soon brought back the rest of Max's conversation with Jack.

...

"So... Do you want to fuck Jason?"

Again almost choking on his beer, Max had had to cough the alcoholic liquid from his throat for a good minute or so.

"W-what?"

"You know, I thought it's only fair since I'll get to fuck your son."

"I-I don't think J-Jason thinks that way about me."

"You sure? I've seen the way he looks at you, you know. He's just the same as your son, but you're in the sights now." The rottweiler had said. And he wasn't lying. Another thing Max had been trying his best to ignore, were the increasingly aggressive advances of Jason, who was doing the exact same thing as Aaron but only towards the labrador dad. "The pup's crazy about you. And if he's anything like me, he's not going to stop until you pound that pretty little ass of his good and hard."

There had been a long silence after that.

"One thing: you don't have to use a condom."

....

The buzzing of his smartphone brought Max back to the present, and the confused dog dug out his phone and quickly unlocked the screen. He had gotten a message from Jack, there was an image attached. Swallowing hard, Max opened the image, looking at the screen with wide eyes, as the pixels on it depicted a view from Jack's perspective of the big rottweiler fucking the young labrador. Aaron had an unbelievably ecstatic expression on his face and his canine cock was fully erect and pointing towards the camera. Next up, Jack sent Max a series of pictures from different angles of him and Aaron having sex, and the father labrador frantically scrolled through them all. Finally, the rottweiler sent Max a short video with the caption: "Just knotted your son" Along with an eggplant emoji, and Max watched as on-screen, Aaron was squeezing his muzzle shut not to moan, as the big rottweiler knot finally popped inside his tailhole. Lastly, Jack only sent Max a plain text, which read: "Jason's studying alone at my house. The front door is unlocked. I think you know where his room is." Along with a winking emoji.

Totally overwhelmed by the situation at hand, Max stood up and stormed out of the house, rocking the weirdest boner inside his trousers as he headed over to Jack's house not even bothering to put on his shoes.

The shaken labrador stopped just outside Jack's door, holding out his hand just above the doorknob, pondering whether he should actually do what he was thinking of doing. After a few excruciating seconds of indecisiveness, the large canine pushed the door open and entered the familiar, but intimidating house. With big leaps, Max made his way upstairs, his big paws thumping against the hardwood floor as he walked over to the door to Jason's room. At the door, he stopped again, trying to listen to the last remaining shred of sense he had in his head, otherwise filled with horny thoughts.

Just then, the door was abruptly opened and Jason looked up at his neighboring labrador's flustered face with an equally flustered expression. The males locked eyes for a brief moment and that was enough. Max quickly grabbed the young rottweiler, shoving his maw onto his and passionately kissing the surprised pup right on the mouth. Jason got swept up by Max in no time, and he wrapped both his arms and legs around Max's large body, hanging onto the sizable labrador as the two made out in the doorway.

Max wrestled Jason's tongue both inside and between both their mouths, slobbering his canine saliva all over Jason's muzzle, also tasting his in the process. Holding Jason in his arms, Max walked towards the back of the room, aiming for the small bed by the window. Locking lips the entire way, Max fell down onto the bed trapping the younger rottweiler under his adult figure while continuing to kiss Jack's son frenetically.

Jason and Max continued kissing on the bed, Jason removing Max's shirt in the blink of an eye, and Max tearing down Jason's shorts with the same speed. The two finally broke off their kiss, huffing onto each other's muzzles while exchanging looks. Promptly looking down, they both set their gaze on the massive bulge on the front of Max's trousers, and the bigger labrador also noticed a corresponding, smaller bulge on the young rottweiler's underwear.

Without saying a word, Jason reached down to tug at Max's pants, the rottweiler pup having to work with the belt before he could get the tight-fitting pants off the older male. Now the only thing holding back Max's erection were the white briefs, already awfully strained by the size of his endowment. Jason looked at the white bulge as if hypnotized, his young eyes gleaming with excitement and lust. He quietly scooted towards Max's crotch and reached down towards the bulge with both of his paws, making contact with the concealed mating mast. Jason quietly gasped as the bulge responded to his touch, twitching a bit when the soft paw pads of the black and brown dog slid over the white cotton fabric. Max voiced a low growl as Jason carefully caressed the older canine's covered package.

Eventually, Jason set his paws on the elastic waistband of the underwear, taking a quick glance up at Max who was bent over the nervous rottweiler. Max gave a small nod and Jason started to pull down the old labrador's white briefs. Dragging them down, the pup first uncovered a furry sheath, which quickly expanded onto a sizable knot of a real canine cock. At the same time was uncovered the older labrador's big canine nuts, followed by inches of thick, throbbing shaft, which eventually ended at the big red tip, already slick with the labrador's precum. Max saw how Jason's eyes widened and how thrilled the younger dog was to see his bare member. Looking a bit further down, Max noticed the twitching bulge on Jason's underwear, one that was slowly getting wet by the very tip. Wanting to take charge, the labrador aggressively pushed his left paw inside the younger rottweiler's underwear, getting a good feel of the other male's genitals before pulling off Jason's boxers in the blink of an eye. The younger canine almost missed his chance to moan with how fast the older labrador was with his paws.

Max's erection and Jason's backside now fully exposed, the bigger canine brought the tip of his lovepole between the younger rottweiler's cheeks, and the smaller pup twitched noticeably from the touch of Max's dick. The room seemed an awful lot quieter all of the sudden, and both males could clearly hear each other's breaths and thumping hearts in the slowly darkening, late-noon-sunlit room. It had been so long since the old labrador had been together with someone like this. Not to mention with someone so young and a male as well. Just the very thought of this actually happening made Max's erection throb harder than ever before. He was already so horny he was sure his reproductive instincts would fully take over any second now.

Gazing down into the eyes of his neighbor's son, Max started to push his tip against the rottweiler's hidden orifice between his furry buttcheeks. "W-wait! W-what about...?" Jason muttered, nodding his head towards the night-stand, which had a pack of condoms laying on top of it. Max slowly looked back and forth between the pack and Jason, finally glancing down to his own raging boner. "It's fine..." The labrador finally muttered. "I have already got the ok from your dad."

Jason quickly wrapped his arms around Max's neck and moaned as the huge tip of a labrador cock spread out the outer ring of the rottweiler's sphincter. With no lube at hand, and it probably being his partner's first time at proper anal sex, Max made sure to go as slowly and gently as his growing urges allowed him to. But contrary to the big labrador's assumptions, Jason seemed to be purely enjoying every second of the long-lasting first penetration of his unused canine anus, closing his eyes and moaning ecstatically the whole way in. Between them, Jason's canine erection throbbed fiercely, glistening precum slowly covering his red and knotted shaft while Max's member sunk deeper into the smaller male.

Both males groaned softly as Max's entire length, minus the knot was inside the young rottweiler's rump. Breathing heavily while the soft, young insides of Jason clamped down on his cock, Max reached to his right, picking up his phone he had set there earlier. While Jason still had his eyes closed and was biting his lower lip, Max leaned forwards, extended his right paw, and snapped a picture, which clearly showed Jason getting penetrated by him, cutting off just by the older labrador's muzzle. Unsure, and frankly not even caring whether Jason had noticed, Max quickly sent the picture to Jack's number, now waiting for the father rottweiler's reply.

Quickly enough, Max's phone vibrated and he got a reply from Jack. The first message was a winking emoji, followed by a text "Ride him hard". Next, Max received a picture where Jack's erect rottweiler member was laying on top of Aaron's creampied rump, a few pieces of broken rubber latched onto his shaft. "The condom couldn't handle my second load. Sorry." Throwing his phone aside, Max took a steady stance with his paws on Jason's mattress, drawing his lungs full of air for the next part.

Max groaned as he felt Jason's entire figure tensing up around his malehood when the big labrador finally moved his furry hips. The rottweiler underneath him moaned softly as the sides of Max's shaft rubbed the sensitive insides of his canine hole, the older male slowly retracting his meat from Jason's anus. As his shaft was almost outside the tight rottweiler hole, Max exhaled, his breath ruffling the fur of Jason's face. Then, as if a switch was flipped, Max slammed his cock at the back of Jason's hole, the younger male yelping out in surprise and tightening his grip around Max's neck when the bigger canine began the rough mating.

Following Jack's advice, Max started fucking his buddy rottweiler's son as hard and fast as he could right out of the gate. The image from inside Aaron's room back at his house flashed through Max's mind and the labrador used it to fuel the aggressive movements of his hips, pounding his meat inside Jason's snug little hole, mimicking what he had seen Jack do to his own son. The bed beneath them rocked and creaked when Max fully got to his rhythm, slamming his strong canine hips against Jason's rump repeatedly, only barely registering the smaller male's lusty moans in the dim room. With every thrust, Max's knot pressed up against Jason's anus, the thickest part of his breeding baton already begging to get squeezed up inside the warmth of the young rottweiler's rear-end. But the up-until-now-virgin dog hole was still refusing full entry from Max's endowment, although it was rapidly getting there.

Continuing to hammer his cock inside the moaning rottweiler, from the corner of his eye, Max noticed the screen of his phone lighting up again as a sign of another received message. Not at all slowing his pace, the labrador quickly grabbed the phone, unlocking the screen and opening the new message from Jack. This time it was a selfie from above the older rottweiler, the camera facing down and showing Jack sitting on Aaron's face, the younger of the labradors eagerly licking the rottweiler's scrotum from underneath the grey canine rump. "Are you fucking yet?" Was the text attached.

Pounding the puppy rottweiler even harder thanks to the stimulating photo, Max quickly typed a reply message for his friend: "Take a listen."

Calling to his neighbor, Max set down the phone next to Jason on the bed, so that when Jack answered, there was no way he couldn't hear the slapping of Max's balls against Jason's butt or the moans from the maw of the young rottweiler getting fucked. Watching the screen from the corner of his eye, the huffing labrador saw the call being answered and proceeded to furiously mate with his rottweiler partner like he was in heat.

The smaller body of Jason rocked back and forth on the bed from the older dog's harsh thrusts, and the rottweiler was moaning constantly as his prostate was getting absolutely destroyed by Max's cock. As the rapidly growing pleasure made rounds inside the younger canine's body, he gradually started getting more and more relaxed, the effects of which were also quite noticeable down by his back-door. Max's knot was now slowly stretching out Jason's outer sphincter, burrowing itself a bit deeper with each of the rapid thrusts the horny labrador delivered onto the younger male's rump. Not quite yet completely controlled by his desires, Max also noticed this and began driving his knot inside the rottweiler tailhole with full force.

Feeling his hole dilating way beyond what was comfortable, Jason screamed ecstatically on the bed, his erection twitching furiously as Max's knot was being fed to his stretching hole. Max growled, bearing his teeth as he put as much weight as he could muster on his hips, forcing the knot to slip past his partner's sphincter. Jason screamed even louder when the canine monstrosity popped to the better side of his entrance, probably loud enough to be heard even outside the house. The knotted rottweiler trembled and cum began seeping out from the tip of his canine member, the sensation of being knotted forcing Jason over his edge and into climax. His eager load spilled out onto the bed and on his belly, the stench of dog semen quickly taking over the air around the bed.

The tightness of the young canine's hole convulsing all over his erection, Max had to grit his teeth in order to hold back his own orgasm, which was not far off. Taking deep breaths, Max picked up his phone and said to the microphone: "Just... Knotted... Your... Son..."

Only partially recovered from his orgasm, Jason twitched and looked at the phone in the older labrador's hand in disbelief. "D-dad?" He asked, his face flushing red as he realized his father had heard him screaming. "Now listen as I cum in your son's ass..." Max groaned, dropping the phone onto the bed. "W-wai-nnggghhh~" Max shut up Jason's protest with a sturdy thrust, grinding his crotch against the rottweiler while moving his member, lodged inside his colon.

Max aggressively pushed and tugged his cock within the younger male's tight confines, slowly getting himself more room to work with inside Jason's ass, the rottweiler insides around his rod gradually loosening. Still, the apparent incompatibility between the size of Max's meat and Jason's hole forced the bigger canine to move more slowly than when he hadn't yet knotted the pup. Lucky for both of them, the stimulation was amplified about ten-fold from the knotting, even despite the loss in speed. Max groaned and Jason whined as the older male's canine lovetool began flaring inside the hole it was buried in, foreshadowing the labrador dad's orgasm.

There was no doubt that Jack was listening in over the phone when the tailhole of his son was finally bred by Max, who let out an exhaustive and long groan when he finally reached his climax. Buried knot-deep and down to the very base, Max's labrador dick erupted inside Jason's rottweiler rump the heavy lab testes pumping a good month's worth of semen into the smaller canine. Max didn't recall ever cumming as hard as he did now, into the tight tailhole of his neighbor's son. It seemed like his shaft could go on spewing the hot labrador seed for ages, the majestic canine phallus throbbing as it unloaded rope after rope within the tight grip of the smaller rottweiler. Jason voiced a defeated whimper as Max's load overtook the little empty space he had in his ass, the warm labrador seed filling up every nook and cranny of his stuffed buttpipe.

Max's orgasm was so powerful, the old retriever could only barely keep himself from collapsing on top of Jason. The cream-colored canine groaned and huffed when the very last drop of his load had been pumped up inside his, also out-of-breath partner. As both their breaths slowly settled, the room was again awfully quiet, now with all the moaning and slapping gone from the audio space. Max and Jason locked eyes for a second, both instinctively looking away and blushing immediately afterward.

"You already done?" The static voice of Jack said from the phone. "Geez Max, I thought you would've lasted a bit longer than that. Well, I guess I can't blame you... If Jason's ass was half as tight as your son's, then I probably would've cum that fast as well." The rottweiler chuckled from the other end. "Anyway, I'd ask Aaron to say hi to you two, but I'm pretty sure he can't since he has my entire dick in his mouth, so... later!" The screen of Max's phone promptly read: "Call ended"

Max and Jason gave each other quick looks and then chuckled a bit. The two dogs then locked eyes for a while, before Max dove down on Jason's mouth, again kissing the younger pup passionately. Jason wrapped his arms around Max's neck, returning the kiss and wrestling Max's tongue with his own, all the while still being knotted by the older canine.

Their somewhat tender moment was abruptly interrupted when Max's phone buzzed yet again when Jack sent them another photo. It was a picture of Aaron, who was smiling and doing a peace sign at the camera, the entire cock of the daddy rottweiler inside his muzzle, knot included. "That fucking mutt..." Max muttered to himself, tugging his own knot which was still inside Jason's tailhole. "Let's show him!"

The young rottweiler yelped as Max suddenly moved on the bed, lifting the other dog up against the wall, getting a grip of Jason's buttocks as he himself moved closer to the wall. Now on his knees on top of Jason's bed, Max started pumping his cock up into the young rottweiler, his knot popping in and out from Jason's hole in an irregular rhythm. Putting his paws on Max's wide shoulders, Jason moaned, his back against the wall when his prostate was yet again being stimulated by Max's cock, even more so than before. "Let's see how your dad likes this!" Max sent Jack a series of shots of him knot-fucking Jason up against the wall while the labrador retriever devilishly smiled at the camera.

As expected, Jack quickly replied with a shot of Aaron, whose eyes were wide open in shock, presumably because the rottweiler cock in his mouth had just sent a messy load down his labrador throat.

Max huffed and promptly stood up on the bed, dragging Jason a few feet higher on the wall, the young rottweiler's insides tightening with the surprise. Accelerating his movements, Max now took a short video from between his legs where one could easily see how the fat labrador knot repeatedly squeezed itself in and out of the stretchy rottweiler orifice, along with Max's big canine balls swinging back and forth on-camera. Click, and... sent. Max also took a few shots from directly above his head, so that you could also see Jason's red face and his smaller rottweiler cock between the two males.

Again, Jack replied within minutes with a short video of Aaron riding the rottweiler dad's cock in cowgirl, while moaning and panting like the young lab was in heat.

The tightness of Jason's colon was quickly getting to Max, and the old labrador retriever was soon about to cum for the second time. "Come on! Let's get a good cumshot pic for your dad!" Max growled, switching his harsh thrusts into more gentle and grinding humps, carefully moving his knot just at the tightest grip of the small rottweiler's sphincter. Jason reacted by moaning loudly and grabbing the creamy fur of the labrador's back with his paws, his own canine member most likely about to burst as well.

"Come on, come on! Hngg~!" Max muttered, thrusting his cock to the absolute back of Jason's rottweiler hole, the knotted canine lovetool throbbing just as fiercely as before, soon starting to ejaculate inside Jason's butt. "Mmmmhhhh~ There we go..." Max groaned, taking a series of shots from underneath Jason's brown backside, each of them showing a bit more cum squirting out from the sides of the young rottweiler's hole as Max's testicles contracted just a bit further away in the shot. Jason soon whimpered, his red rocket also ousting its second load, which Max also filmed for obvious reasons. Click, and... sent!

...

The rest of the day and long into the night, the two families sent each other photos of performing almost every conceivable male on male sex-act cross father and son. Jack sent the lab dad pictures of him pile driving his cock into Aaron's ass from above, holding the young labrador upside down while he gave the rottweiler a blowjob, fucking Aaron against the window with the curtains up, holding the young lab in his lap while jerking off his canine cock and many, many different cumshots. From next door, Max sent the rottweiler dad pictures of fucking Jason on their dinner table, cumming all over the rottweiler pup's face, fingering Jason on the kitchen counter, taking the younger dog from behind on their balcony, and many, many cumshots of both himself and Jason.

...

The next day, Max and Jack were having breakfast together in Max's house, eating toast and drinking coffee on a sunny Saturday morning. Neither of them said anything and were distracted in their newspapers, even though there was a palpable tension in the labrador's kitchen. "So... Umm.. Did you and Aaron have fun... last night?" Max asked, as if he didn't already know the answer to his own question. The expressionless rottweiler took a sip from his coffee and replied with a quick nod. "You?" He asked in response.

"...Yeah..." The labrador dad muttered, sipping his own coffee. "Probably the most "fun" I've had since my twenties..."

"I'm sure Jason is delighted to hear that. Your son wasn't that bad either." Jack grunted, shifting his position on the wooden kitchen chair.

The rest of the meal was conducted in silence.

Downing the rest of his coffee, Jack sighed, setting down his big white cup onto the table. "Phew, that was good!" He said without showing too much of anything on his face as usual. "It was..." Max replied, also putting down his cup.

"I guess the only thing left to do now is to give food to these two." Jack said, lifting the checkered tablecloth to reveal Aaron sucking on the rottweiler dad's cock underneath the table. "Yeah..." Max sighed, lifting the tablecloth on his side to look down at Jason who also had a cock in his mouth.

"Mmhh~ Keep going pup, I'm almost there..." Jack groaned.

"Hngg~ Remember to say "thank you", Aaron!" Max groaned.

"Thank you!" The two sons said in unison, receiving a fat and creamy breakfast straight inside their muzzles.