Gabe sighed as he took a seat on one of the benches in the waiting room, since the chairs were too small to account for how far he had to spread his legs to give the enormous bulge in his pants some space. Oddly, Dr. Fang hadn't been ready to greet him the moment the receptionist entered him into the system, like she usually did. Perhaps she was busy with another patient?

Opting to pull out his phone rather than check the magazines in the nearby rack, he only had to wait a few minutes before he heard the receptionist calling out to him. "Gabe?" the vixen called out with a teasing touch to her voice, "Dr. Fang will see you now."

The Maine coon's ears pricked up and he rose from his seat, with a fair amount of effort to lift the hefty endowment he bore. "Sure, uh, where do I go?" he asked.

She pointed towards the back of the room. "Take a left, go down the hall, and follow the signs to room Beta-Two."

Doing his best to maneuver through the waiting room without knocking over chairs or bumping his gigantic balls into people along the way, Gabe followed the directions, keeping his eyes out for the signs to follow. What was different today? The receptionist had said Dr. Fang was ready for him, which ruled out a different doctor seeing him today, so what did it mean...?

Reaching the door, he gave it a brief knock, and heard Dr. Fang's voice call out, "Come on in." She sounded perfectly normal to him, so he opened the door and stepped inside. It seemed to be a pretty normal exam room, one of the bigger ones like the one he'd been in last time when the interns had had their... learning experience with him. Dr. Fang was in the corner facing away from him, and judging by the way her arms were positioned she was holding a clipboard. He could hear her writing something on it, too. "Take off your pants and sit on the table, please," she instructed without turning around.

"Sure," Gabe murmured, a little flustered as he untied the drawstring on his pants and slid them downwards before getting up onto the exam table. She'd placed a cushion on there for him, sparing his posterior from the cold metal surface. "What are we testing today, d-?"

His question was cut off as Dr. Fang put down the clipboard and turned around to face him, his eyes widening at what he saw. The wolfess's labcoat was open and she wasn't wearing anything at all underneath it, and while he gave her bared breasts a momentary glance, his gaze immediately flicked downwards. An enormous cock, gray near the base and gradually transitioning to a fleshy pink near the tip, hung flaccid over a huge pair of balls covered in fluffy gray fur, each slightly bigger than a soccer ball. Impressive as they were, her own endowments were smaller than his, her cock reaching 'only' about two feet long and substantially less thick than his own. It was quite a sight, and one that made his shaft throb and stir in response.

"Oh, yes," she remarked offhandedly as he stared at her, "Thanks to your success, I've been able to broaden the trial a little bit. I've only taken a few doses so far, but I'm sure I'll be up to your level in no time."

"I... I see," Gabe stammered. "Um... so, am I going to be testing something new for you today...?"

She gave him a little smirk, her own eyes lingering on his cock as it stiffened up. "Of course!" she said eagerly, reaching into a labcoat pocket and taking out a small bottle, unscrewing the cap. "I've already taken my dosage."

"Dosage of... what?" he asked, watching as she took out a little white pill from the bottle, setting the others aside.

"Oh, mine is already tried-and-true," she remarked, reaching down and patting the side of her enormous balls, making them wobble back and forth a bit. "Just a production enhancer. But yours..." Still holding the pill in one hand, she reached underneath Gabe's mostly-hard cock and grabbed it just behind the head, hefting it until it was pointing at an upward angle. "Hold still..." she murmured to him, as he gripped the table with his hands.

She pushed the pill against the opening on his tip, and he groaned out a little as she pushed the pill inside. In reflex, his cock tugged it downwards, and the pill disappeared into him rapidly. "There we go," she declared victoriously, lowering his cock back down. With a glance at a wall-mounted clock she noted out loud, "Dosage taken at... 12:32 PM."

"What... what did that do?" he asked, bewildered.

"Just a safety measure," she told him, now working on stroking her own cock with one hand as she kept hold of his shaft with the other. "And some other effects that I'll explain later. I wouldn't want to influence the outcome of the test!"

He panted softly, his own length fully hard now as he watched Dr. Fang's own stiffen up rapidly, thickening a bit as blood flowed to it. Hers was practically drooling precum onto the floor while, oddly, his own wasn't, for a change. Perhaps something about the pill she had just given him? "What kind of test?" he asked her.

"Thanks to the work of my interns, I already know you'll be able to handle this," she said confidently, taking a hand off her cock for a moment to sweep her long silvery hair behind her back and out of the way. "So all I need you to do is keep still."

Though he still wasn't quite sure what was going on, any uncertainty was quickly dispelled the moment she grabbed her fully erect dick and guided it towards his own, pressing their tips together. "Wait, that's not going to-!" he began, only to be proven wrong as his urethra stretched open readily around the head of her shaft. Moving her hand from her cock to his so she could grasp his meat with both hands, she groaned out as she stepped forward and sank her length into his own, easily able to slide every last inch into him, bulging out the underside of his dick with the outline of her own.

It was a very new sensation for Gabe, even after the tests the interns had run on him last time – Dr. Fang immediately began thrusting her hips back and forth to fuck his cock with her own, leaking very generous amounts of pre into him as she did to slick up the inside of his shaft and make her motions easier. Her breasts bounced a bit and her balls swung back and forth with each motion, her hands maintaining a tight grip just behind his cockhead as she shoved her thick, throbbing flesh into his own over and over again.

"Mmh, wonderful..." she murmured, her eyes lidding a bit. "Better than I had imagined...!"

Gabe couldn't do much other than groan and squirm as she kept thrusting. His cock was sucking at hers in reflex, but far less powerfully than the last time something had been stuffed into it. That must have been the 'safety measure' she mentioned, but the tugging motions of his dick were still enough to pull her plentiful precum down into his own sack. The whole thing felt intensely pleasurable for Gabe, and he kept a firm grip on the table, tipping his head back and staring up at the ceiling tiles as he took heavy breaths.

"Mmh... I should have had one of them here to keep count..." Dr. Fang grumbled for a moment as she kept up her thrusts at a steady pace, hands gripping and kneading the sides of his cock. "Well, I'll do it, then... here comes number one...!"

A few more bucks of her hips later and she hilted in his cock, grinding her lower belly up against the head of his glans, squishing it a bit. She moaned out as he gave a groan, and her cock throbbed hard and erupted into his, her balls audibly churning as they unloaded – and with a very immense load at that. Even though her sack was smaller than his she managed to pump out more cum than he did in a typical climax at his new size, and every rope of it she blew into him flooded down his cock and into his own sack. Gabe trembled and moaned as her cum filled up his balls and made them swell out, getting heavier and heavier as they bloated downwards, swaying slightly.

Throughout it all, Gabe felt intense pleasure yet felt no orgasm of his own even approaching him, while Dr. Fang was embroiled in hers, her tail wagging back and forth behind her. When she came down from her climax, she panted for a little bit, and he asked her, "Was... that the experiment?" between breaths of his own.

She gave him a chuckle and shook her head. "Far from it," she told him, flashing him a smirk. "That pill I gave you should last for three hours, and I intend to make full use of the time..."

He gulped, and any further protest he was going to make was drowned out as she began thrusting again, her cock still hard and throbbing within his own.

It was a gauntlet of endurance for Gabe, even though Dr. Fang was doing all of the work. At first she kept the same position, standing in front of him and fucking his cock, going at a faster pace on subsequent rounds. The quicker hammering of her hips to ram her shaft deep into his own only amplified the bouncing of her breasts and the waving of her hair and labcoat, her balls swinging forward enough to smack against the underside of his cock each time.

Her second climax made his balls ache from how much their weight tugged down on his sack, and with her third orgasm, they swelled to a big enough size that they touched the floor and began to spread out from there. He couldn't cum at all, but in contrast she seemed to blow her load into him frequently, every orgasm just as potent as the first, her balls pulling up in their sack whenever she unloaded another series of great, thick blasts of seed into his cock and down into his ever-swelling orbs.

But she didn't stop there. After each orgasm she glanced at the clock, only to resume fucking him at a hard and heavy pace, panting for breath from the exertion yet able to carry on regardless. Gabe could feel his balls swelling bigger and bigger, and spilling further across the smooth cold floor – not that it remained cold for long under the thick fur of his sack as it radiated heat from its surface. Eventually they grew large enough that, as Dr. Fang moaned and shot yet another load of wolfess cum down the inside of his shaft, those huge nuts of his bumped up against her legs as they sloshed and swelled, forcing her back a step. Surely that would be the end of it...

However, after another glance at the clock, Dr. Fang took a moment to breathe, and then reached up to tug off her labcoat entirely, tossing it aside. With a determined look, the now-naked wolf simply climbed up onto his ballsack, the size of it able to support her weight with her feet sinking into it just a little, keeping her cock buried in his as she did. With his massive dick now angled upwards, she tightened her grip and began thrusting down into it as she bent over, her legs spread out for stability. "Here comes number twenty...!" she declared, but he had no idea if her count was accurate or not from how overwhelming the whole experience was. All he could do was groan and stare up at her breasts, now that she was between him and the ceiling tiles.

Her sack thumped against his cock all the more heavily in this position, and the next time she came into him, shuddering atop his enormous balls, his orbs wobbled as she blew more hot seed into them and swelled them out further, knocking her off-balance. Falling forward, she reached out and grabbed onto his shoulders to steady herself as she moaned through her orgasm, shuddering against him, hanging onto him tightly. In the wake of her climax she panted heavily for several seconds, then murmured, "Gabe, dear... what time is it? I can't see the clock..."

Struggling to focus from all of the pleasure he had experienced without release, he looked over towards the clock. "Uh... it's... just after two-thirty..." he mumbled.

"Plenty of time for more, then," she replied, and tightening her grip on his shoulders, she began rocking her hips again, hands no longer holding his cock as she thrusted downwards into his shaft. Relentlessly, she fucked him over and over in the new position, holding onto him for stability every time his sack wobbled and sloshed from each load of cum she pumped into it, making it swell further and further out across the floor, and pushing her up closer to the ceiling as well. Gabe could barely comprehend what was going on, reveling in the intense feelings of her cock pounding in and out of his, and feeling his balls getting so big that they were pressing against the walls of the room, reaching closer and closer to the far side too, his own legs propped up against his huge sack...

At last, when Gabe answered that it was 3:22, Dr. Fang hummed in thought for a moment. "No time for another, we'll have to stop at thirty-one," she mused aloud, and began to pull back from him, her rump bumping against the sofa and momentarily dislodging a ceiling tile.

"W-wait, what about me?" Gabe groaned out. Looking past Dr. Fang, he could see that his balls were taking up almost the entire room – and feel it too, as his absolutely gigantic sack was pressing against three different walls.

"Don't you worry, I'll send in some help," Dr. Fang informed him as she withdrew completely from his shaft. After being fucked for hours, he felt strangely empty in there, his cock and balls both tingling all over from still getting no release. She turned away, and he could see that her inner thighs and legs were completely drenched with juices from her slit as she awkwardly crawled her way across his churning, sloshing ballsack towards the door, tapping on the intercom panel next to it. "Marco, Celine, Donna, please come to Beta-Two for a drainage session," she instructed, then sprawled out against Gabe's huge balls, exhausted and panting for breath.

The interns showed up very shortly thereafter, but they could barely get the door open on account of Gabe's massive balls hogging the room. "Wow!" the calico cat at the front exclaimed at the sight as she tried to squeeze her way in through the door, "Like, how many did you get, Doctor?"

"Thirty-one," Dr. Fang said between breaths. "The suppressant will be wearing off any minute now. Make sure to use the maximum setting."

"Will do!" Celine echoed, managing to get through the door and wedge herself up against Gabe's balls. Awkwardly, the interns forced their way into the room and Dr. Fang slipped out, apparently uncaring that she was naked. Gabe watched and felt Celine and then Marco the raccoon climbing up onto his balls, while Donna the white wolf tapped on a panel by the door.

One of the ceiling tiles moved up and out of the way, allowing a big clear plastic hose to descend from the hole in the ceiling, with a big glass cup attached to the end. The raccoon scrambled forward, making Gabe groan a bit from all the rubbing against his enormously over-full balls the three of them were doing. There was a tingling running up and down his spine, almost like an impending orgasm but a bit dulled...

"Oooh, look at his face," he heard Celine say as he stared upwards with crossed eyes. "He's, like, totally gonna blow soon."

Grabbing the end of the hose hanging from the ceiling, the raccoon intern quickly shoved the cup over the end of Gabe's cock, tightening the rubber ring at the end of the cup to form a seal. All of his moving around was not helping Gabe in the slightest, and he gritted his teeth as his cock throbbed and his balls churned loudly, preparing for their impending release.

"Gosh, these are so warm," Celine murmured, rubbing her hands through the fur over Gabe's sloshing nuts. Sprawling out on them, she swept her arms in big circles. "I can hear them too, it's like that thing when you get a shell from the beach and..."

Gabe let out a gasp as the tingling sensation of an oncoming climax reached full strength, due to whatever 'suppressant' Dr. Fang had given him finally wearing off. "I'm, I'm gonna-!" he cried out, his toes curling as he gripped at the table under him.

"Whoop! Maximum settings, coming right up!" Donna declared, flicking a switch.

The hum of the machinery coming to life and starting to milk Gabe's cock with a suction pump was only audible for barely a second before he let out a loud moan, which in turn was drowned out by the sound of his gigantic sack finally blowing its load – though it was almost entirely Dr. Fang's second-hand load at this point. Huge gouts of cum blasted up and into the hose, sucked off elsewhere to be collected for something, visibly bloating out the hose from the sheer volume of seed pumping into it. As his balls churned and clenched, both of the interns on top of it were tossed around and had to grab onto handfuls of his sack, letting out cries of surprise.

But Gabe didn't register any of it, completely lost in by far the most intense orgasm of his life. Over and over again his cock throbbed and blasted more thick, hot jizz into the suction machine, slowly reducing the size of his nuts back down to something more reasonable. Celine lost her grip as his balls clenched and pulled towards himself, and she fell onto the floor with a yelp only for his balls to roll back over her again for a moment until the next shot of cum pulled them back off her again. For minutes on end Gabe's climax kept going, until he finally fell back against the wall and was left dazed and gasping for breath by the end of it, his sack almost but not quite back to the size it had been that morning.

Meanwhile in another room, Dr. Fang looked approvingly at the gigantic storage tank of cum that Gabe had just filled for her, checking the readout on the side. "Mm, perfect..." she murmured to herself, her tail swishing, "I'll have to give you a bonus for your performance, Gabe..."