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"Tommy!" The nurse called out.

"That's us kiddo. Let's go!" Mark said happily, grabbing his son's paw and standing up.

The pair of foxes strolled over to the doorway leading to the examination rooms, with the smaller one skipping along the way. The husky smiled at them, looking down at the little 3-year old cub. "How's it going today champ?"

"Gooooooooood," the kid said with a goofy smile, swaying back and forth a bit.

"Well that's good! You all ready to see the doctor?"

"Mmm-hmm!" he nodded excitedly.

"Well, right this way then," the husky said, turning his gaze briefly toward Mark before turning tail and walking back the hall. He took a right shortly after getting back there, leading the pair into the first open room. "I'm Nurse Ricky, by the way. Just a couple measurements first and we'll grab the doc," he continued as the foxes followed him. "Come right over here and we'll get you measured," he said, turning his attention toward Tommy.

The fox kit eagerly followed the other canine's instructions, wandering over onto the scale while the husky jotted down some notes, quickly grabbing the young fox's height and weight. The measurements went quickly enough, though it took a moment for the cub to stand still enough to get them exactly. After finally succeeding, Ricky grabbed a couple more tools off the table to his right and knelt down to Tommy's level.

"Okay, couple more things and we'll get going. First I'm going to just check your temperature. Hold this in your mouth for me..." he said, holding out the end of the thermometer for the cub. Tommy quickly obeyed, taking the tip between his lips and holding it for a second, though almost immediately after he started bobbing his head a bit on it. Ricky chuckled a bit, shaking his head. "Save that for the doc, kiddo. You've taught him well," he noted, turning back toward Mark and smiling.

"Not a lot of teaching to do," Mark chuckled. "He is a fox after all. Put something there and he'll start sucking naturally."

Ricky laughed in return, finally removing the thermometer from the cub's mouth. "You're going to be a great slut," he noted, reaching out and ruffling Tommy's headfur. And with breath as bad as that, guys'll be lining up to use you."

Tommy squirmed a bit, giggling as he smacked his lips a bit. "Daddy helps! He likes it when I keep his pee in my mouth," he said innocently.

"Oh does he?" Ricky remarked, shooting a quick wink toward Mark. "Well, your daddy's raising you right kiddo. Keep doing what he says. One more thing and I'll grab the doc," he finished. Ricky moved one of his paws down, gripping the cub's sheath and lightly stroking it. He then lowered his head to take the tip inside, pressing his lips over it and forcing his tongue in and against the cub's shaft. It didn't take long for a response, with Tommy's immature shaft quickly growing and sliding over Ricky's tongue. Only stopping once he could feel the small little knot swelling did the husky pull off, giving a quick kiss to the pointy end of the dick. He grabbed the nearby tape measure and did a quick check of the cub's length, jotting it down at 4 inches. "You're a hung little boy! You'll be as big as your daddy soon."

"He's got a long while before that I think," Mark chuckled, stroking his shaft off to the side as he watched the display, the adult's shaft nearly 10 inches in length.

"You never know, kids grow up before you know it. Besides, I know you want him bigger just as much as I do. Always a day of pride when you can feel your kid's knot stretching your ass," the husky retorted. "Anyway, for now, I'm gonna grab the doc and we'll be back in a second," Ricky said, turning around and ripping a nasty fart right in the cub's face.

True to his word, the husky was back quickly with the doctor, a rather large wolf. Ricky was leading him in by the shaft, keeping his paw locked around the back of the lupine's knot as the two walked into the room, just over a foot of wolf meat leading their way.

"Well now, who do we have here?" the doctor said, stepping away from his nurse and kneeling down in front of the cub, his dripping shaft right in front of the cub's face.

"Tommy," the fox cub said in a cute voice. Almost before he'd finished speaking, the cub leaned forward and ran his tongue over the tip of the wolf's shaft, lapping up a droplet of pre.

"Aww, well aren't you just the cutest thing. My name's Dr. Engels, but you can just call me Rob. You have fun with that while I ask your dad a few questions, okay?" he asked, but the question was largely pointless. Before he'd even finished introducing himself the cub had taken the head inside and was lightly sucking on it.

"Cute kid, knows his place very well," Rob said, turning to look over toward Mark, smirking as he saw his nurse already deepthroating the adult fox. "Just a few questions for his file, then we'll get to the proper tests," he continued, stifling a moan. "So first, what're we in for today?"

"Nothing muuuuuch," Mark said, drawing out the word as Ricky gave a particularly rough tug on his balls, the husky knowing exactly how to treat his guests. "Just a routine checkup, want to make sure he's coming along well."

The wolf nodded, jotting down notes as he went. "Alright. Just at quick glance, he seems healthy, happy, and he's a good size for his age. Certainly sex-hungry, so I'd say just off that he's doing great. What all do you two get up to at home?"

"The usual stuff, mostly. He's been doing oral for a little over a year, anal for just under. We've got him a couple toys to keep around when we're either not home or busy, and he's usually got one in, or humps one of his stuffed animals. We even got him one with a special hole built in."

"Lucky little guy," the wolf said, rubbing lightly over the back of the cub's head, not pushing him down further but still encouraging him to keep sucking. "So with oral, has he been deepthroating, or do you just let him go at his own pace?"

"His own pace mostly," Mark said, reaching down and holding the husky's head steady and jamming himself into the warm throat, in stark contrast to how he treated his son. "He hasn't even gotten close to the knot yet, and usually stops when he feels like he's going to throw up."

"Got it. And anal - he has been knotted there, right?"

The fox looked a bit sheepish. "No, not yet...I know most kids his age have been knotted by now, but we're always worried about hurting him. We'll get to it soon, and I know he wants it, but...we don't want to turn him off of it, or make him too much of a masochist, y'know?"

Rob continued writing, but shook his head a bit. "I think you're being a bit overprotective of him. He's probably going to start kindergarten soon, and his teachers are going to be worried he's neglected at home if he struggles to take a knot. Let's see how the tests go today, and if they go well enough, we'll try tying him here. Sound good?"

Mark wasn't in much of a position to disagree. Ricky's oral skills were off the charts, and he already felt himself about to blow. Sensing the impending orgasm, Rob chuckled and quickly moved on, taking the fox's moans for a yes. "Okay, couple more quick questions - how's his diet been?"

"Pretty standard, I'd say. Was almost entirely cum for the first year, but we couldn't resist slipping a little piss or shit in. After he turned one he started drinking straight from the source, and it wasn't much long after we started just pissing down his throat. Few months after that he got into drinking diarrhea, and we'd try to make sure we got him quite a bit there once we saw how much he liked it. Since he's been about two though, same diet as us, able to eat the solid logs just fine."

The wolf nodded approvingly this time, jotting down the notes. "And it's been varied, right? He doesn't just eat from your ass or your husband's, he gets a mix?"

"Oh yeah. We want him to have a balanced diet, and we routinely make sure we have friends over who can contribute as welllllll," mark said, his last word turning into his loudest moan yet. His shaft started throbbing as Ricky finally pushed him over the edge, spraying jet after jet of burning, diseased jizz down the nurse's throat.

Rob chuckled, giving Mark a moment to breathe. He knew how powerful the husky's mouth could be. Once he saw the fox's chest rising and falling a bit slower, he continued. "One final one - Is he trained to hold it?"

Mark tilted his head back and forth a bit. "Eh. Hasn't been a big priority for us, but I'm sure he will be soon. There are times he can resist if we tell him to hold it for a bit longer so we can play, but other times he just shits or pisses while we're walking around."

"Fair enough. I'm sure you don't mind walking in it either," the wolf teased. "Well, I think that's all I've got, so I'll leave you two to the rest of your fun," he joked, reaching over and smacking his nurse roughly on the ass. "You ready for us to start Tommy?" He asked, looking down and watching the fox cub bob over and inch or so of his length. The cub nodded a bit in reply, not taking his lips away.

"I thought so," Rob remarked, placing a paw more firmly on the back of the cub's head. "We're going to test your deepthroating first. I'm going to slowly push my dick in, and you just tell me when you feel like you're going to vomit, okay?" he asked sweetly. The cub nodded, not paying attention to the obvious flaw with this plan.

"Alright, here we go," the wolf said, easing his shaft forward. It didn't take long before he felt the head surrounded by extreme tightness, pressing into the fox's esophagus. The cub had to steady himself, focusing more on his job now, wanting to impress the doctor with his skills. His daddies were always so happy when he could take it further, but this was going to be more difficult with how thick the wolf was.

"Almost halfway buddy, good job! You're a good cocksucker, just like Ricky over there," the doctor said, continuing to ease his length in further and further. It got more difficult as the cub started gagging a bit when Rob got too far in. He didn't stop, and though Tommy wanted to say something to make him do so, he soon realized that the cock was stopping him from saying no. Another inch was pushed in, and the fox cub's gag reflex was fully triggered. Small pools of vomit managed to push their way up past the shaft and sprayed out over the doctor's crotch, coating the length and his groin with kit vomit. Rob didn't start pulling out until he was sure the vomit had ended, making sure his body was decorated with as much of the regurgitated feces and urine as possible. He marked the spot on his shaft with his fingers, grabbing the tape measure from earlier and slapping it along his cock, showing that the cub had swallowed eight and a half inches of it.

"How'd he do, doc?" Mark asked from the sidelines, with the adult fox moving down onto the floor behind the husky and shoving his tongue straight up the other canine's ass.

"Eight and a half. Pretty good for a 3-year old," Rob started. "Most cubs his age can handle about that. It varies by species, but usually getting the head into their throat by the time they're 2 is a good point to be at. Then roughly seven inches by age 3, a foot by age 4, and by age 5 their gag reflex should be completely gone. Only limit is if the cock's just too wide for their throat by that age. So he's about an inch beyond where I'd expect at this point, but like I said, it varies by species. He is a fox, and they're usually expected to take the most."

The wolf turned back toward the cub and smiled, knowing his father was too busy to continue the conversation, and gave the kit's cock a few reaffirming strokes. "You did good kiddo. Ready to test the other end?"

Tommy nodded, licking his lips and collecting the excess vomit around them. "Uh-huh. I can take more back there!" He said proudly. As if to show off, the cub immediately turned around and got on all fours, lifting up his tail. A sticky sound emerged as he did, with the cub's tail peeling away from his ass cheeks, semi-wet scat having almost glued the two together. As he got into his new position, however, he spotted his father now with his head a few inches back from the nurse's ass, catching a thick, chunky log of shit dropping out of it.

"Daddy, can I have some?" the cub asked excitedly, licking his lips as he watched.

Seeing as Mark's mouth was a bit too full to respond, Ricky spoke up. "You'll get to eat it next in a few hours kid, don't worry. Besides, I think you'll be more than full before you leave today," he said with a wink. Another grunt sounded out in the room as the husky continued pushing, blowing another burst of gas into Mark's face, sending flecks of shit spraying across it.

"We'll have our own fun Tommy," Rob remarked, kneeling down and sliding the tip of his shaft through the slimy waste coating the cub's backside. "Your daddy says you're used to this, so I'm not going to go easy, okay?"

"Hurt me, daddy!" The cub giggled, knowing the phrase he heard and used so often at home. He wasn't even fully aware of its meaning, but he knew he usually had more fun after saying it. Rob needed no further invitation and leaned over the cub, putting one paw on the ground and resting the other on Tommy's shoulders. With a rapid thrust of his hips, he slammed himself forward, cramming his cock up the cub's tight backside.

"Mmmmf...damn, you weren't kidding. I can hilt you in one go and you barely even flinch. I hope you're ready kid, because I'm not stopping until my knot's deep in your gut," Rob growled, pulling himself out and slamming back in once more, battering the cub's hole with his knot again.

For a while, very few but distinct sounds echoed throughout the room. On the doctor's side, a repeated squishing and smacking was heard. Every time the doctor sloppily pulled out, bits of shit and leftover cum and piss would spray out of the cub's ass and over his crotch, the fox's cheeks, and the floor below. Every time he pushed back in, the same noises here heard, but ended with a rather pronounced slap of hips meeting ass. Each time, the knot threated entry with the wolf desperately beating up on the hole before him.

On the other side of the room, the sounds were much different, but still very much shit-related. Mark was a rather sloppy eater, and today was no exception. He noisily smacked his lips, chomping down on each log that Ricky gave him. He tore through them like his life depended on it, with bits of excrement flying from his lips as he noisily ate his meal. Every time Mark would swallow, another deep brown, solid log of waste poured from the husky's behind. Despite having just jizzed down the other canine's throat, Mark was already on the brink of another orgasm. After starting to doubt whether the Husky could truly shit forever, the flow finally stopped. Mark whimpered as he realized no more was coming out, but quickly dug his tongue back up the husky's rump to scoop out every last nugget of shit he could scarf down.

"Good toilet," Ricky moaned, reaching back behind himself and holding Mark's head tighter against his hole, smearing his nose up and down through the shit-streaked crack. "Why don't you say we go join in on the fun they're having?" He soon remarked, however, not wanting his ass to end up too clean.

Mark pulled back and smacked his lips, lapping up some of the waste that had somehow managed to not end up straight in his stomach. He stood up, spun Ricky around and planted a deep kiss right against his lips, shoving his shit-coated tongue deep down the husky's throat. Ricky wasn't complaining in the slightest and immediately returned the action, wrestling with the fox's tongue and scraping off a small bit of waste for himself. Their shafts ground together as they tried to force their bodies to merge into one, with Mark even wrapping a leg around behind Ricky's and bringing them somehow closer. It was a couple minutes later when they pulled apart, both panting and with a fresh coat of feces on their lips.

"What do you say we make it two knotted foxes in this office today?" Ricky quipped, not even waiting for an answer before spinning Mark around in turn and kicking him in the back of the knees, forcing him to drop down onto them. He shoved the fox's upper back forward, knocking him onto all fours, face to face with his son. The husky soon after dropped his weight fully onto the adult fox, forcing him into the ground. Without warning, he jammed his shaft right up Mark's tailhole and got to work, having been erect but uncared for through the entire visit up until this point.

"You two are hot as fuck, you know that?" Rob panted, barely able to keep himself from filling up the cub's ass before now. His thrusts were growing more and more erratic, knot getting closer to entry every time he pressed forward. Tommy was whimpering slightly as he was brutalized, but he still wasn't complaining.

"We know," Mark quipped before leaning forward just a bit and grabbing the back of his son's head, resuming the kiss he had just broken off with the nurse.

With a chuckle, Ricky looked down at the pair as he continued to thrust. "They're foxes, they know what they're doing. I think we should follow their lead," he said with a wink, leaning further over the top of Mark and shoving his tongue against the doctor's, creating another make out session. The kisses were routinely broken as the thrusts grew wilder and wilder, tongues slipping out of mouths only to be shoved right back in. The arrangement would have been difficult with four adults, with the tops needing to stretch rather far over similarly-sized bottoms to pull it off. With a cub on the bottom, however, it made things so much easier.

It wasn't just easier to make out though - it was also much easier to get off. The fox cub's ass was so much tighter than an adult's, a big reason why the wolf went into pediatrics. His knot slammed harder and harder against the cub's entrance, knowing that if he didn't get it inside soon it wasn't going to happen at all. Rob placed his paws around the husky's back and used him for leverage, pulling himself forward as he thrusted inside, having thrown all caution out the window as he forced the cub's first knotting upon him.

After what seemed like ages and many failed attempts, it finally slipped inside. No sooner did the wolf feel the cub's tight anal ring clamp down behind his knot did he started howling into the husky's mouth, accompanied by Tommy screaming into his father's. Jet after jet of wolf seed sprayed into the cub's gut, filling up his bowels more than they had been filled in his life.

Much like the cub's tight ass had gotten the wolf off, his father's was making quick work of the husky. He was by far looser, with Ricky's knot slipping in and out of the hole freely, but he knew how to use it. Before the wolf's orgasm had finished, his nurse's had begun, filling up Mark's ass with a comparable but slightly smaller load. Spooge sprayed freely into the foxes who still hadn't broken their kiss, both happy to take such filling loads into their holes.

As the orgasms died down, the four males finally separated their kisses to pant, with the doctor and nurse breathing a bit more heavily than their bottoms. While Mark was relaxed, Tommy was squirming constantly.

The three adults just smiled, all remembering their first knots, chuckling a bit. Mark spoke up first, licking his son's nose. "Doing okay kiddo? Feel full?"

"It hurts, but I like it...It feels like I haven't gone poop in a week!" he cried, a mixture of pain and excitement in his voice.

The adults laughed again. "You'll get more used to it. Now that I know you can, you're going to get knotted every day."

"You promise?" Tommy asked hopefully.

"This kid is toooo cuuuuuuuuuute!" Ricky shrieked, reaching forward and rubbing the top of the cub's head.

"No kidding, but if he doesn't stop squirming, I'm never going to be able to pull out," Rob remarked, the doctor only half joking. "Here, focus on this kiddo," he said, bracing himself against Ricky. The doctor took one of his paws and stretched it behind his back, where a distinct crackling sound could be heard. Only a few seconds later did he bring it back around, his paw completely overflowing with a pile of creamy, light brown waste. Knowing immediately what to do, Tommy opened up and the wolf wasted no time shoving it inside, smearing his paw across the cub's snout as he did. Mark, not one to be left out, quickly resumed his kiss with his son, swapping feces back and forth.

"Aww, none for me?" Ricky said cutely, clearly jealous of the two beneath him.

"You're insatiable, you know that?" Rob said, shaking his head but moving his paw back behind him. Another faint crackling and a few seconds passed once more, only for another huge pile of shit to emerge. "Come get it, handsome," the wolf quipped, shoving the pile into his own muzzle but not shutting it, offering it out to the husky who immediately accepted.

Both pairs pushed the feces back and forth, in and out, feeling it dribbling down their cheeks as they kissed. Rob and Ricky dribbled loose shit down onto the foxes' heads, while the vulpines drooled their waste down onto the floor. It was a constant battle - all four of them wanted to swallow every last bit of it, but none of them wanted the kissing to end. By the time it was done, all four of their faces were smeared with wolf shit, and a significant amount had ended up on top of the fox's heads. Almost as soon as Rob and Ricky broke off their kiss, the doctor howled once more, with the cub's squirming ending up milking another load out of the wolf's cock. Between the loads in his ass and the waste he was scarfing down, the cub's tummy was starting to bulge out.

After feeling his breathing slow a second time, the wolf pulled away and wrapped his arm around the cub's chest, leaning back and pulling Tommy into a sitting position. The cub's bulged gut was much more obvious this way, but the doctor could at least hold the cub still while his knot deflated enough to pull out. Ricky had managed to pull out of Mark's ass, and immediately placed his muzzle next to it to chug the mixture of jizz and shit pouring from it. After getting his fill, the husky and fox simply sat next to each other, stroking each other's shafts while the group chatted, neither one seemingly ever tiring of the fun they were having.

Almost half an hour later, giving Mark and Ricky enough time to sixty-nine and suck another load out of the other, the wolf finally felt his knot deflating a bit. He leaned himself forward again, and knowing he had to do it quickly before the movements started pushing him toward a third orgasm, he yanked himself out of the cub's backside, spurring a small yelp from Tommy but nothing more. Similar to his nurse, he moved his muzzle down and started slurping up his own jizz mixed with the cub shit he'd battered into paste, running his tongue over the cub's bruised backside.

Sitting back up and with a relaxed sigh, the wolf smiled. "Well, I know who my new favorite patient is," he remarked, reaching forward and shoving his shit-streaked paw over the cub's nose once more.

"Well, you'll get to see him again in six months for his next checkup I'm sure. I'll request you two specifically," Mark added with a wink, giving a special squeeze to Ricky's shaft.

The wolf and husky shared a glance before turning back to Mark, both quickly with the same idea. "Why wait? We do, shall we say, home visits as well. Here's my personal number..." Rob said, trailing off as he shoved a couple fingers back up his ass and pulling out some more waste, scrawling his number over Tommy's chest with it. "We're happy to run the same tests again, no charge obviously. Just make sure he's nice and full beforehand. We'll get him deepthroating and double-penetrated before next year."

"Double pen...pen...penetrated?" Tommy piped up, finally speaking for the first time in a while, stuttering a bit as he figured out the word, used to his parents just calling it a cock in his ass or something similar.

"That's right kiddo. It's when your dad and I put our dicks in your butt at the same time. Sound fun?" the wolf smirked.

"Can we try it now?" Tommy excitedly asked, already trying to move himself back over the wolf's cock.

"Oh no you don't," Rob said with a laugh, picking up the cub and keeping him off. "You're just my first appointment today; I've got other cubs to see. I can't use up all my energy on you! Besides, I have a feeling your dad's going to make sure we see each other again very soon. Isn't that right?"

Mark was vigorously nodding before the question was even asked. It took all his strength, but he finally pulled his paw away from the husky's shaft, standing up and dribbling a bit more cum down his legs. "You bet. Hell, we've got a spare bedroom if you never want to leave, but somehow I doubt we'll even use that. Come on Tommy, let's head home. We'll get you knotted up again before dinner."

"Yay!" the little fox cub shrieked, standing up and moving toward his father. He stopped momentarily, however, and turned back around, remembering his manners. He leaned forward and planted a kiss on the tip of the wolf's cock, not even having to bend over while the doctor was kneeling. He lapped a bit of his own waste off and smacked his lips, giggling a bit before speaking. "Thanks for the fuck!" he said happily.

"Too. Cute!" Ricky repeated. "Get out of here before I fuck him myself."

Mark just laughed. "Hey, I'm not the one saying no here. You're the ones with the busy schedules," he teased. "Like I said though, soon enough. Hell, come over tonight if you want. You've got our address on file."

"We might just take you up on that," Ricky said, pointing his cock at Tommy's head and spraying a bit of piss over it, unable to help himself. "Let me show you out for now, and Rob, I'll be back with the next patient in a second."

"Nice to meet you Tommy, and keep working on it! I'm going harder next time," the doctor said with a wink.

The foxes and husky smirked as they turned to walk out toward the lobby, with both Tommy and Ricky holding onto Mark's shaft as they walked. As they got out to the waiting room, Ricky planted a sloppy kiss on Mark's lips and stood with his ass right in front of Tommy's face. "See you next time," he dismissed, lifting his tail for the cub.

Tommy inched his way forward and lapped over the hole, collecting a nice tongueful of feces for his departure. "Bye bye!" he called out, his voice muffled through his snack.

As the two foxes walked out, Ricky stared at the pair's asses. Jizz dribbled down their legs as they walked, with the husky licking his lips until they finally rounded the corner. He wasn't going to last long with the next patient. He turned back around, bent over the desk, and checked the waiting list. "Jack?" he called out to the room, turning and looking around at all the parents who'd just witnessed their display, every single one sporting an erection.