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Michael could hardly believe what he was seeing, or hearing, for that matter. There was his little nephew Sam splayed out on his hotel room bed with his ass in the air and a fat dildo sticking out of him. Not only that, the kid was moaning his uncle's name and apparently fantasizing about getting fucked by the older rhino!

The sight was definitely unexpected, but, as Michael's now rapidly swelling penis would suggest, it was by no means unwelcome. The big, bottomless rhino entered the room and began to make his way over to his nephew's bed, taking his shirt off as quietly as he could manage and grinning as he watched the boy fuck himself.

"Hey, little guy."

"Oh, shit!" Sam exclaimed, rolling over onto his side and grabbing a pillow in some sort of desperate but hopeless attempt to hide the fact that he had just been masturbating.

"Hahaha, no need for that kind of reaction...I was enjoying the show."

"Oh my God, Uncle Michael, I'm so sorry...but...damn, you're big."

"You think so?" Michael responded, casually moving into a double-bicep pose, flexing his tremendous arms and pushing his pecs forward while rolling his abs. The rhino's muscles were something to behold, but, for Sam anyway, the best part was the total exposure of his uncle's hirsute pits. Sam had long lusted over those, and the stench emanating from them, the smell of his absolute stud of an uncle's musk and sweat was mind-blowing. From there, Michael moved his arms down and inward, causing his pecs to pop, before he moved into a standard most muscular pose, his entire upper body flexing and rippling. Loving the show he was putting on, Michael turned around and flexed his back, each muscle Sam could see being perfectly defined and glistening, including his uncle's hairy glutes, thighs, and calves.

Aside from raising an eyebrow at his uncle's forwardness, and certainly drooling a bit, Sam didn't seem to have any idea of how best to respond this unexpected turn of events. Frankly, Michael guessed, the young man probably hadn't expected his uncomfortably hot uncle to flex for him, let alone flex for him without any pants on while sporting an increasingly erect cock.

Finally, Sam just asked, "So...you do you know you're a little bit naked?"

"I certainly do, kiddo. I had some fun at the gym this morning that left me without a good pair of pants. Do you mind the lack of clothes?" Michael asked, slowly stroking his still growing cock with one hand and running the other hand up and down across his furry abs and pecs.

"Uh...no?" Sam responded, staring at his uncle's massive shaft as it began to drool pre onto the hotel carpet. "I'm just surprised, and I'm surprised you aren't upset."

"Aw, of course not I'm not upset, Sam," Michael said as he got onto his nephew's bed, pushing the kid over and climbing on top of him. "And I'd love to fuck you," he added, kissing him. The kiss started out relatively mild, or at least as mild as a kiss can be when its between a gigantic 39-year-old rhino and his much smaller 16-year-old nephew. But before long, Michael pushed his thick tongue into the kid's mouth. He explored his Sam's maw for the first time, and, excited by the novelty of this new taboo, his cock swelled until it rapidly reached its maximum length, burping up some pre onto his nephew's chest. As the kid also explored his uncle's mouth, their tongues twisting and trading saliva, drool running down Sam's chin, Michael's right hand began to travel downwards, in search of that fat dildo he he'd seen a moment ago. While his nephew explored his mouth and worshiped his hugely muscled, hairy upper body, Michael found that dildo, now only partly inserted in his nephew's ass, and began to push it back into the kid's rectum. He heard and felt his nephew groaning softly, a state which continued until the dildo's base reached Sam's sphincter, lube running out of the kid's ass and over Michael's fingers.

"How's that feel, Sam?"

"It feels...really good, Uncle Michael."

"I've gotta' say, I'm glad you found this dildo, kid," Michael commented as he began to pull the rubber shaft out of Sam.

"I'm glad you packed it...ughhh." Sam groaned as his uncle then reinserted it.

Michael then took hold of his nephew's waist and pulled the younger rhino down to the end of his bed, pushing his head back down onto the mattress and hiking his ass upwards. From there, he continued to steadily thrust his fat dildo in and out of the kid's ass, watching, almost mesmerized as his nephew's sphincter was alternately pulled outwards and pushed inwards.

"Ohhhh, Uncle Michael...this feels amazing."

"I'm glad to hear it. You want me to fuck you, and that's what I intend to do. This cute little butt needs to be prepared if it's going to take all of this," Michael said as his shook his cock, a glob of precum flying off somewhere.

Michael spanked his nephew's toned grey ass as he shoved the dildo in once again, first on the left cheek, then the right.

"Damn, that is a nice ass, Sam." Michael commented as he watched the grey flesh ripple with every smack. "Do you work out or something?"

Panting and drooling, but still able to muster enough intelligence to answer, Sam responded, "Yeah...I'm on my high school's soccer team..."

"Well, I'd keep it up if I were you. It's doing wonders for your ass...and the rest of you, by the look of it."

It was a reasonable opinion, and Michael couldn't help but admire the kid's body. He may have been smaller than Michael, though who wasn't smaller than Michael, but the young rhino was definitely an athletic young man. His calves and thighs were taut and muscular, and his back, although less of a mountain range than Michael's, was still pretty defined for his age. Crouching down behind his nephew, Michael took in further enjoyable sights, most notably the young rhino's surprisingly formidable cock and balls. Initially Michael couldn't see the cock in question, obscured as it was by the kid's balls, each being about the size of a baseball and musky as all hell. Needless to say, they were also becoming increasingly slick with sweat and the extra lube that occasionally escaped Sam's tailhole or was prevented from entering at all. Michael extended his tongue and began lick the heavy teenage orbs, taking one and then the other into his mouth, sucking and slobbering all over them as he began to reach for his charge's shaft.

"Your tongue feels so good! Please don't uhhhhh..."

Sam couldn't finish his thought as he felt his uncle wrap one hand around his erect meat, slowly stroking it with lube and Sam's own pre. It was the first time anyone else had touched his penis like this, and Sam could hardly believe it was really happening. But it was definitely happening, and Michael was having a good bit of fun with it, pulling his nephew's foreskin back and teasing the kid's piss slit, running his hand up and down the grey shaft and blindly attempting to trace the veins which covered it, and generally enjoying the feeling of this already surprisingly girthy shaft swell, gradually increasing the distance between his thumb and forefinger. Michael also continued to play with Sam's balls, letting one fall out of his mouth before kissing and licking the other, sucking it in and nibbling lightly on his thick grey hide. Eventually, he pulled the kid's throbbing dick backwards and continued to stroke it once the shaft was parallel with Sam's thighs. For a few minutes Michael just slowly and steadily stroked the thick cock, pushing his dildo in and out of his nephew's ass all the while.

"Your friend back here is ruining the bed." Michael said as he watched his nephew's cock drool precum. "But I sure as fuck don't mind."

Michael's comments then degenerated into a series of grunts and slurps as he ran his tongue down from Sam's balls to the tip of his dick, before taking the kid's meat into his mouth. Naturally, Sam's gasps only got louder and more high-pitched. This was not only his first blowjob. It was a blowjob performed by his hot, hugely muscular, and frankly rather handsome uncle. The bigger rhino first focused on the head of his smaller companion's cock, placing a particular emphasis on running the tip of his tongue under Sam's foreskin and around his dick, before playing with his slit. It was difficult to cram much of his tongue up and into that hole, but Michael managed to get three or four inches of thick tongue up his nephew's urethra.

"Oh shit! Jesus fucking Christ!"

"Got quite a mouth on you, apparently." Michael replied, pulling his tongue out of the kid's dick before taking the shaft back into his mouth.

Michael continued to suck and lick the turgid length, and for a while went no further than halfway down. Finally, after maybe ten minutes of this, Michael began to push further, and in one smooth and easy movement allowed the entirety of his nephew's penis to slide into his throat. Now repeatedly gulping down the young dick, Michael squeezed and massaged the thick intruder, and it was no surprise to him when, a few minutes later, he heard Sam almost struggle to gasp, "I'm cumming..."

The kid's cock swelled in his uncle's throat and began to pump thick rhino cum into Michael's stomach. This went on for at least another minute, with Sam collapsing on his hotel bed as his balls emptied themselves into his uncle's mouth and esophagus. The little rhino, Michael realized as his gulped down his nephew's load and his belly filled, held a respectable volume of cum in those testes. However, although Sam had managed to expel at least two or three pints of semen, Michael's abs were such that no visible bodily expansion took place. Really, no one would have been able to tell that the massive rhino had enjoyed a hearty liquid breakfast, assuming, of course, that he wiped the cum off of his chin and chest prior to going out in public. Michael was a bit of a messy eater. As the flow began to lessen, Michael pulled off of the dick, stroking it as the last dregs of cum pooled on the bed and carpet.

"Damn. That tasted pretty good, Sam. But I hope you're ready for round two." Michael said as he began to pull his dildo out of Sam's ass.

"Can we take a break first, Uncle Michael? I'm feeling a little out of it right now...."

"Sorry, kid, but I'm way too horny for that right now. This dick of mine needs to be inside someone, and your pretty hole is calling its name."

Michael stroked his engorged cock a few times as he began to walk past his nephew and towards the nightstand, all the while spreading precum up and down his shaft. Picking up the bottle of lube Sam must have left there after prepping his uncle's dildo, Uncle Michael poured a fair amount of the slick substance all over his dick. Turning around, he slowly flexed one last time for his now hazy eyed nephew, wiping extra lube on across his torso, making his already very defined musculature shine. Before returning to Sam's backside, he took the kid's head in one hand and began rubbing his cockhead all over the kid's face. Thick globules of pre coated Sam's features, and the stench of musk invaded his nostrils. His tongue lolled out of his mouth and his mind glazed over as it prepared for another and even more intense session, his own dick rapidly filling with blood once again. Michael withdrew his shaft after a few moments, wandering back to the foot of the bed and taking in the glorious sight before him. The boy's sphincter was beautiful. His glutes were toned and hairless, but the area just around his asshole was exactly as hairy as Michael liked. First teasing the kid, Michael circled a couple of fingers around the hole before pushing them inside. Michael couldn't help but find the kid's moans adorable, and while massaging his nephew's rectum was fun, the musclebound rhino wanted a taste of that ass. He took his fingers out and got down on his knees. First licking up from Sam's balls, across his taint and over the hole, Michael then forced the tip of his thick tongue into Sam's bowels.

"Oh fuck, Uncle Michael!"

Sam gasped and his legs jerked as Michael began to run his tongue around the inside of his ass, pushing in a bit before pulling out and exhaling heavily on his hole. Pushing back in, Michael didn't stop after just the tip or even the first couple of inches, but instead began to push more and more of his tongue into his nephew's rectum. While stroking the kid's once again drooling cock, Michael managed to shove upwards of eight inches of thick wet meat into the boy's ass, stretching him out and teasing his prostate gland. The rimming went on for a while, during which time Uncle Michael's tongue probably managed to touch every part of his nephew's ass, inside and out. When he finally pulled out for the last time, Michael couldn't help but lick his nephew's quivering hole one last time before standing up and spanking Sam's butt. Growling loudly, Michael placed his throbbing 15-inch cock between his nephew's cheeks and began to slowly dry hump his horny little nephew, all the while leaking copious amounts of thick precum over Sam's lower back and ass. Finally, Michael took hold of his shaft and lined his cockhead up with his nephew's now thoroughly stimulated tailhole.

"Ready for this, kid?"

"I think so..."

"Well then, let's get to it."

Setting one hand over his nephew's right shoulder and gripping the lower half of his cock, Michael began to push forward. There was some initial resistance, but Michael certainly didn't have to strain himself in order to punch through. And really, it was fun to watch the poor boy's sphincter push inwards as it did its best to keep the massive intruder out. But it did give way and, accompanied by an incredibly loud gasp from Sam, Michael felt and saw the tight pink pucker open, rapidly stretching as the bigger rhino's thick dick entered the boy's ass.

"Shiiittttt. Fuck yes, that feels so fucking good, " Michael whispered as began to push the first few inches into Sam's butt. Not that anyone would have been able to hear him over his nephew's incoherent mewling.

Now that that initial source of resistance was broken, there was nothing Sam's tight insides could do to halt the slow but steady advance of his uncle's gigantic meat. Michael couldn't help but smirk as he watched inch after inch of his thick 15-inch cock sink into his nephew, his hairy grey abs standing in stark relief as he slowly rolled his hips forward. Slick with lube and cum, his shaft spread the little rhinoceros' rump more and more while Michael held tight to the boy's shaking hips. The feeling of shoving himself into someone for the first time was always incredible, and Michael had enjoyed that particular pleasure on more than a few occasions, but the fact that this was his nephew added a completely new level of excitement. Finally, after about twenty to thirty seconds of almost continuous insertion, Sam's gaping sphincter reached the base of his uncle's throbbing schlong, the older rhino's heavy balls pressing against his own. Sam tried to say something like, "Oh God, Uncle Michael, you're so big," but frankly there was just too much cock inside of him for anything but a series of gasps and grunts to leave his lips. The feeling of fullness was overwhelming, not to mention the fact that his uncle's dick was physically displacing his insides in such a way as to put pressure directly on his diaphragm. Sam's arms gave out and the front half of his body collapsed onto the bed, his ass held up by his uncle's firm grip and insistent penis. His hands now free, one gripped the sheets tightly while the other began to wander across his smooth but athletic chest, and then downwards. What he felt as he reached his abs was almost unbelievable. Instead of the smooth, fit belly he had come to know and love, there was a tremendous bulge. As he began to run his hand over it, he came to realize that not only had his abdomen actually been pushed outwards in order to accommodate his uncle's size, but also that the bulge was throbbing and pulsing in line with his uncle's heartbeat. This helped to punctuate the now painfully obvious fact that his own Uncle Michael was now balls deep inside of him. But as painful as it was to have that much cock shoved up his now quite formerly virgin ass, the pain soon gave way to an almost indescribably pleasurable sensation of utter fullness. That feeling, combined with the crushing pressure being placed on his prostate, helped Sam to understand that this was the greatest thing he had ever experienced, and that his uncle was a stud worthy of not just admiration, but worship.

Michael paused like that, both to allow Sam to get better acquainted with the sensations of getting fucked, and to allow himself a moment to get used to the incredible tightness that was engulfing him. Noticing that Sam was shaking a bit less violently, and that his whines and gasps had gotten a bit less frequent and a bit less high pitched, Michael figured that the kid was ready to continue. With a deep exhale, Michael began to pull his shaft out of Sam's ass. He took his time, not wanting to injure the kid, and the slower pace allowed him to relish the sight of his nephew's sphincter as his cock's motion stretched and pulled the tight ring outwards. Once only his sizable cockhead was left inside, Michael proceeded to slowly hilt himself a second, and then a third time. After ten more deep thrusts into little Sam, and about ten minutes of steadily faster, but still relatively gentle fucking, Michael decided a new position was in order. Lifting Sam up from the bed and sliding him all the way down onto his cock, the thick length shooting pre deep into the kid's bowels, Michael climbed onto the bed before slowly lying down on top of his now completely prone nephew. Dwarfed by his uncle's bulk, Sam was pushed down into the mattress, his leaking cock sandwiched between his belly and the now irretrievably soiled sheets beneath him. Michael then wrapped one arm around Sam's neck, cradling the boy's neck on his meaty forearm, and closed his whimpering little mouth with the other hand. Now free from the danger of producing at least some of the conspicuous sounds that would accompany what was about to happen, Michael pulled about half of his cock out of his nephew's ass before slamming it back in.

"Mmphhh!"

"Mmmphh!"

"Mmmphhh!"

Each hard thrust was accompanied by a muffled cry from Sam and a hearty grunt from his drooling uncle. The pace only quickened as time went on, and the hotel room bed rocked violently as Michael railed his nephew. The only thing approaching relief for Sam was during those few moments when his uncle paused to grind his hips against Sam's ass, the older rhino's hairy muscle butt flexing rhythmically. Basking in the tightness that clung to his cock, and the squelching noises permeating the room as his shaft forced large quantities of pre and lube out of his nephew's ass, the big muscle god of a rhino plowed the kid for at least another five minutes. Eventually, knowing that his orgasm was approaching as a familiar sensation began to build in his cock, Michael lifted himself off of the kid and turned Sam onto his side, placing one leg over his shoulder. He never stopped thrusting into Sam's guts, and the sight of his cock very visibly filling the gasping teenager only pushed Michael closer to the edge.

"I'm gonna' cum, Sam. Ready to feel my load inside of you?"

Knowing that his nephew was too full of dick to say much of anything, and no longer caring who heard or what might happen, Michael pulled out until just his head was left inside before hilting himself in his nephew's tight ass and coming. All across Michael's tremendous body a vast network of muscles contracted and flexed as his cock throbbed inside of Sam, the older rhino's roar no doubt audible across their floor of the hotel, and probably on the floors above and below as well. Michael's heavy sack contracted with each individual ejaculation as he pumped pints of thick cum into the boy, and Michael watched with some satisfaction as his nephew's belly moved in tandem with his throbbing cock as it was filled with spooge.

Sam, on the other hand, was dumbfounded. The realization that he had just gotten fucked by his hot uncle was setting in, and he knew he had gotten fucked in part because he could now feel his uncle's hot cum filling his already well-stretched ass. There was just so much of it! As his uncle's orgasm continued, he could actually see some hint of his belly expanding even further, and he could feel the liquid making its way deeper and deeper into his intestines. Whatever cum didn't find its way deeper into him was likely pushed out of him by his Uncle Michael's massive schlong, and Sam assumed that was why it felt more and more like he was lying in a warm puddle rather than on what had once been a crisp, freshly made bed. Really, the only thing Sam couldn't believe, at least at this point, was how lucky he had gotten. Lying there and basking in his own afterglow, he had an almost perfect view of his uncle's perfectly muscular, hairy body. Sweat ran down Uncle Michael's still heaving form, forming rivulets in the crevasses between his uncle's muscles. To Sam's mind, it might well have been the most beautiful thing he had ever seen, and the only thing capable of tearing him away from it was the new sensation of his uncle's softening penis slowly exiting his rectum. Squelching noises filled the room once more, and, before long, his uncle had withdrawn completely from his body and stood before him naked and apparently content, his still thick, heavy cock slick and dripping onto the carpet.

"Well, Sam, I don't know about you, but I thought that was pretty fun."

"Oh my God. I almost can't believe that just happened..." said Sam, still breathing heavily as his gaping sphincter attempted to close, cum continuously leaking out of it. "My ass feels so empty now."

"Heh, yeah. It might take a bit for that cute butt to recover. But until then..." Michael said as he turned and began to shuffle through his luggage, grinning once he found what he had been looking for. "I think this might be able to keep your ass company for me."

Michael turned back to his nephew, still collapsed on his cum-soaked bed, and held up a butt plug of some considerable size. Walking back to the edge of the bed and lifting one of Sam's legs, Michael steadily inserted the toy into his nephew's ass.

"Ugghhh, fuck, Uncle Michael. Why do I need this inside of me right now?"

"Well, as much as I'm not looking forward to it, we still have to have to have some G-rated fun with the rest of the family, and we can't have you leaking my cum all over the place while that's going on."

"But there's so much of it! You know my stomach wasn't this pronounced before you came in me, Uncle Michael. They'll definitely notice!"

"Oh, don't worry. My cum barely caused your belly to expand, and no one else is going to notice."

"Now come along, Sam," Michael said has he picked his nephew up and forcibly buried the kid's face in his musky orange chest hair. "We need to shower and get dressed. We have what's certainly going to be a very long day ahead of us."