Gabe swallowed, looking up at the sign above the door of the pharmaceutical company's building. He still had time to change his mind, at least technically... sure, he'd already quit his old job, but this was his last chance to back out.

After his... 'exceptional results' during the clinical trial, Dr. Fang had offered him a permanent position as a tester. His hesitance had lasted only as long as it took to see the pay they were offering him. But now, standing outside the building again, as pedestrians had to take a wider berth around him to maneuver around the enormous bulge in his pants that was a result of his last visits here, he felt nervous.

Shaking his head, he took a deep breath and walked forward through the automatic sliding doors. No, he couldn't really back out, and besides the pay, Dr. Fang had promised that he would be doing more "fun and exciting" treatments. He hadn't asked exactly what her definitions of 'fun' and 'exciting' were at the time, but as his huge balls got pushed about within his pants every time he took a step forward, he felt like he had a pretty good idea.

The vulpine receptionist looked up and gave him a flirty look as he approached. "Hi-" he began, but got no further than that.

"Gaaaaaaaaabe!" Dr. Fang called out as she dramatically threw open the doors at the back of the lobby and strode through the waiting area towards him, the wolfess's tail swishing back and forth behind her. "So good to see you! Come with me, we've got science to do!"

Gabe glanced towards the receptionist. "She IS a real doctor, right...?" he asked quietly.

"Oh yes, one of our best," the receptionist reassured him with a nod, moments before Dr. Fang grabbed onto Gabe's arm and whisked him away.

Soon enough, Gabe found himself in an examination room, sitting on the edge of the examination table with his legs spread out wide to allow his cock and balls to hang down over the side of it. Dr. Fang was bustling about the room grabbing papers and tools, assembling a pile of things on the nearest counter. "I'm so glad you accepted. It's hard to find good help, you know!"

"I, um, you're welcome?" Gabe replied, rubbing the back of his head with one hand. "Will I need to get bigger clothes again?"

Dr. Fang chuckled and shook her head as she turned to him, holding a thermometer. "Open up," she told him, pointing towards his mouth, and he opened his muzzle obligingly so she could stick the thermometer under his tongue. "No, not this time at least. I just need to take some measurements as a baseline, but then all I need you to do is take some pills and have one with breakfast and one with dinner for a week, then come back."

"Okahh," Gabe replied around the thermometer. "Whahh do theh do?"

"That's a secret!" Dr. Fang replied mischievously, then cleared her throat and took on a more professional demeanor as she rolled up his sleeve and wrapped a blood pressure tester around his forearm. "In order to avoid tainting the results of the trial, it's important that you don't know what they are until the completion of the trial. It helps avoid false positives."

"Ah thee."

Dr. Fang waited another moment and then retrieved the thermometer, nodding and writing down the result. "And that's it, really! All I'll say is that the effects of this one won't be so... outwardly visible. So no, no new clothes this time."

Gabe nodded and watched her as she measured his blood pressure. Were less visible results a good thing or a bad thing...?

--------------------

One week later, Gabe didn't really feel any different. For all he knew, she'd given him a placebo. The only thing different about the whole routine this time was that he was brought into a different examination room than usual, one that was bigger than the normal one, but otherwise identical in function with a table, a big mirror, and a number of cabinets.

The reason for this was immediately obvious when Dr. Fang stepped out for a few minutes and came back with a trio of other labcoat-wearing pharmaceutical company employees: a male raccoon with big glasses, a calico cat woman whose labcoat failed to conceal the substantial curves of her breasts and hips, and a burly white wolfess who stood taller than everyone else in the room.

Feeling self-conscious, Gabe lifted his legs and brought them together, which was still completely insufficient to cover even half of his enormous sack. "Er, hi," he fumbled.

"Gabe, these are some of our interns," Dr. Fang explained cheerfully, gesturing to the others with her. "Marco, Celine, and Donna." They each waved to him and he gave a small wave back. Snatching up a clipboard off a side table, she went on, "They'll be handling the examination today and collecting results. It'll be a valuable teaching opportunity."

"Uhm, I..." Gabe began.

"You'll collect your payment right afterwards at the front desk," Dr. Fang reminded him, and Gabe swallowed, giving a small nod a moment later. "Excellent! Don't worry, it's all quite routine. They just need to measure the results of the medication and see how it compares to our projections. I'll get us started. Watch closely, you three."

Gabe relaxed a little as things went normally: she took his temperature, blood pressure, and measured a few other things besides, though it was a little awkward when she had him squat over the scale so she could measure just the weight of his cock and balls. The interns mostly hung back and watched, occasionally stepping in to handle the simple things under Dr. Fang's instruction. But eventually she seemed satisfied, scribbling on her clipboard, and gave him a nod. "Wonderful!" she declared, her tail swishing.

"Is that it?" Gabe asked. He'd been worried for nothing.

"Oh, no, that's just the end of part one," Dr. Fang informed him. "But I have other work to attend to, so I'll be leaving the rest of the examination to these three. Don't worry, it's all quite routine, and everything they need is all in these cabinets. I'll be back when they're done."

With that, she swept out from the room and closed the door behind her, leaving Gabe with the interns. "So, um... where do we start?" he asked, glancing over to the cabinets that Dr. Fang had indicated. What other measurements were there to take?

"Taking your pants off would be a good start," Donna told him, the burly wolfess making a downward-pointing motion with her right hand. "We can't take the measurements until you do."

"Uh... what measurements?" Gabe asked, his eyes following Celine as the cat rummaged around in the cabinets, pulling out a big plastic box. He could hear something rattling around inside of it.

"Elasticity measurements!" Marco proclaimed, tapping the clipboard he was holding. "The pills are meant to make you stretchier."

Before Gabe could ask for more elaboration, Celine opened up the plastic box and took out a long, clear rod, holding it in both hands. As Donna gestured again for him to take off his pants, he put two and two together. "W-wait, you can't really think that'll fit...!"

"It totally will," Celine insisted, holding the rod near the bulge in his sweatpants for comparison. "This one would totally fit even if the pills, like, didn't work at all. Then we'll bring out the bigger ones."

"And the toys," Marco added, "Don't forget the toys."

Gabe took a deep breath, thinking of all the money he would get from his, and hooked his thumbs under his waistband and slid his pants down, letting them drop to his ankles. His balls hung freely over the edge of the examination table now, with his cock draped over them. Donna immediately strode over and hefted his shaft in both hands, starting to stroke along its length, making Gabe lean back and groan. Her grip was strong and her hands warm, and it didn't take long for her pumping to bring him up to full mast, his cock bouncing and throbbing as it jutted out from his waist.

"Okay, so like, hold him steady," Celine said as she lifted the rod, holding it in both hands. Marco dashed in to measure the length of Gabe's cock quickly, scribbling it down on his clipboard as the other two proceeded. Gabe bit his lip as he felt the tip of the rod being pressed against his shaft, where pre was already leaking from the tip and running down a little before dripping onto the floor.

He groaned a little and curled his toes as the rod was pressed in through his urethral opening, sinking in deeper as Celine pushed it further and further inside. He tried not to squirm too much, but it was hard, feeling the rod brushing against the inner walls of his cock. More precum spilled out past it, but when it was barely halfway in, Celine suddenly started pulling it back. "Easy," she declared, "Let's try a bigger one."

Marco wrote a check mark with a flourish of his pen. "Let's go up three sizes!" he suggested eagerly.

Gabe gulped as Celine went along with the suggestion and took out a much bigger rod, leaving the first one on the floor. This one had to be as long and as thick as his entire arm! His eyes widened as she brought it to the end of his cock and started pressing it against the tip, and he stammered, "W-whoa, there's no way that'll-!"

He was proven wrong as his urethra stretched readily to accept the large insertion, and he groaned louder, shuddering hard in place. It was thick enough to bulge out the underside of his cock as it went down, and he felt Donna rub her hand against the rod when it passed through where she was holding his shaft. His whole dick throbbed and precum shot out from around the rod, but Celine continued to press it in deeper, until only a few inches were left outside. "It's getting waaay harder to push it in..." the cat grumbled, pressing with both palms at the end of the rod.

Gabe gripped the edge of the exam table, feeling his balls clench. More precum tried to shoot out, but the rod was mostly blocking his urethra, and he could feel the pressure build. The underside of his cock bulged out again, and then the rod was forced out from his tip, shoving Celine's arms back. Surprised, she let go, and the whole rod was sent flying in a spray of preseed, leaving Gabe gasping and panting as his cock suddenly felt so... empty.

"Whoa! That was so cool!" Celine exclaimed after overcoming her shock. "I want to do it again!"

"Wait, use the beads!" Donna suggested, letting go of Gabe's length with one hand to point to the box. "Let's see what happens with the beads!"

"Uh, wait, is this still part of the test?" Gabe protested.

Marco glanced down at his clipboard as Celine pulled out a long string of big, clear glass beads, each one bigger than the last one. "That's not really... well, there IS this 'other' field on here..." he mumbled. "So yeah, I think so!"

"Come on, it'll be fun," Donna urged. Celine brought the beads over and pushed the first one easily into the end of his cock; even though it was the size of a golf ball, it was smaller than the rod that he had just been taking, and the beads only got bigger from there. Gabe groaned as each bead Celine shoved into him not only stretched him wider, but reached further down his urethra, a series of bulges under his cock traveling gradually downwards.

Gabe's eyes rolled upward as they approached the end of the bead string, each one the size of a melon now. Somehow, he was stretching to take every one without issue; he wasn't even feeling any discomfort, let alone pain, and he could probably stretch a lot more. Those pills had obviously worked wonders! He shuddered as Celine pushed the last bead in, and then held up her hands triumphantly. "Success!" she declared.

"Better pull them out, Dr. Fang will be mad if we lose more equipment again," Donna reminded Celine. She gripped Gabe's cock a little more tightly as the beads within continued to descend. "Quickly."

"Oh, yeah, you're totally right," Celine agreed, reaching for the little handle attached to the final bead. Just as she was about to grab it, the beads slipped deeper into Gabe's cock, and he let out another groan. It felt like his cock was tugging and pulling them in of its own accord! "Oh, shoot, it got away."

Donna let go of Gabe's cock and stepped around in front of him, rolling up her right sleeve. "Hang on, I'll get it," she declared, her left hand grabbing Gabe's dick right under the glans, as the beads continued slipping further down. Shoving her hand up against his cockhead, she reached inside, making him shudder again. "Damn, those things are really trying to get away from me...!" she grunted, pushing more of her arm into Gabe's cock.

His eyes closed tightly as she pushed not just her forearm in, but her upper arm as well, finally stopping with only half of her upper arm outside of his cock. "Got 'em!" she declared, and he felt her tug.

And felt his cock tug back.

"Uhhhn...!" he groaned out, wanting to warn her, but the pleasure was overwhelming. Even just staying upright was a challenge. She pulled again, and his cock pulled back, tugging the beads and her arm deeper into him so that she was now up to her shoulder in his dick.

"This one's feisty," Donna grumbled, pulling again. "Stand back, you two. I don't want to knock you over once I get this free." The other interns stood aside, and the wolfess gritted her teeth. "Okay, here goes...!"

She tugged as hard as she could, and at first, made some headway, pulling a few inches back and extracting some of her arm from Gabe's massive dick. But then it pulled back, clenching, and sucked her forwards, and it didn't stop when it got to her shoulder again. To the astonishment of Gabe just as much as the interns, the mighty tug of his cock pulled her inwards even further, her shoulder and then her head getting sucked in, his shaft stretching out widely to take the immense insertion without issue.

"Donna!" Celine cried out, rushing forward and grabbing the other intern around the waist. Donna herself still had one arm outside of Gabe's cock, and tried to push herself back out, but with another heavy tug her arm was forced to her side and she was sucked in deeper, her whole upper body disappearing down Gabe's shaft. He could do little more than groan; it was as though his cock had a mind of its own, pulling the intern deeper inside. She had let go of the beads, and he felt them drop down into his balls, but was more focused on the sensation of her wriggling and squirming within his shaft as she tried to pull free.

But with her arms inside, she offered less resistance, and his cock sucked her in further. Celine lost her grip and quickly grabbed onto Donna's leg, pulling back futilely. Marco grabbed onto Celine as well to try and help, but the muscles of Gabe's enormous endowment proved stronger.

One more clench was enough to pull Donna in the rest of the way: with her legs off the ground, she slipped in like she was going down a slide. Celine kept hold on Donna's leg and kept trying to pull, which only led to her hands getting pulled into Gabe's cockhead as well. Precum was constantly spilling out from his cock and only further slicked their passage, and with Celine being nowhere near as strong as Donna, she was quickly yanked in as well, the calico's tail lashing in futile resistance just before her hips got pulled in.

Only Marco was left, and he grabbed Celine's foot. Gabe wanted to try and fight back, but the sensations were just overwhelming, especially as Donna was dropped into his balls and he felt them sag and swell outwards. It seemed impossible, but he stared downwards in awe as his right orb bulged out around her form, outlining her body as she squirmed. The stretchiness pills must have applied to his balls as well, as there was no other way it could have worked.

Celine was tugged in even faster, and Marco was yanked forwards, his head bumping up against Gabe's glans suddenly, knocking his glasses off. As they clattered to the floor he let out a yelp just before his head was pulled in, his legs kicking and flailing as he was lifted off the ground. Celine continued squirming as she was dropped down into Gabe's left nut, balancing them out a bit, but now both of his orbs were being bounced around by the interns inside of them as they wriggled about.

With nobody trying to pull him out, Marco was pulled in within moments, slithering down Gabe's cock and making him stare unfocused up at the ceiling as he shuddered on the exam table. The weight of the three interns in his sack as Marco was dumped in with Celine was substantial, but the elasticity his cock and balls had gained allowed his balls to swell and hang down until they touched the floor.

Panting, he tried to recover and think, but it was very difficult with all three of them squirming and writhing around, trying to get out, bringing him an immense amount of pleasure. His sack was practically a beanbag now with all three interns in it, and even if he could get up and manage to stand, there was no way he could walk. He could still see them, too, or at least their outlines – occasionally he could catch an elbow, arm or leg as they pushed at the edges of the orbs they were trapped in, only for the elastic walls to push them back in.

It was too much for him, and he bit his lip as his toes curled. Their squirming and writhing and wriggling about in his balls was overwhelming, and he shuddered heavily before letting out an orgasmic cry. His balls churned and clenched, pulling upwards briefly, and a thick gout of cum erupted from the end of his cock before stopping as something blocked the flow.

Feeling them going back out the way they came was just as intense; Gabe bucked his hips and his huge cock bobbed as it bulged out heavily on the underside, forcing one of the interns back up. Popped out like a cork from a champagne bottle, Marco was the first, landing on the floor with a wet splat and a yell as cum showered all over him. His body was covered head to toe in cum, the raccoon's fur plastered against his bare body.

Donna ended up being second as Gabe's balls clenched again, each pump of them sending the wolfess back up head-first. Her larger body required more clenches of Gabe's balls to fire her out, and she landed on her front and slid across the linoleum floor, just as naked as Marco was, several huge ropes of cum following up after her. Celine was shot out a few moments later with much less effort, ejected legs-first from Gabe's pulsing cock, almost striking the mirror on the far wall as she went tumbling to the ground, naked and drenched in cum just like the other three.

With his balls vacated from their occupants and their clothes apparently turned into more cum, Gabe's orgasm continued unabated, enormous blasts of thick, hot cum showering all three of the interns for several more seconds. Thickly coating the floor of the room with jizz, he splattered some of the nearby walls as well, one particularly powerful blast hitting the ceiling, and another one reaching the mirror on the far wall. Panting and gasping once his orgasm ended, Gabe flopped back against the wall next to the exam table and tried to recover.

Marco crossed his legs to try and hide the erection he was sporting as she shook his head. "Did anyone see my glasses?"

"We're going to be in sooooo much trouble when Dr. Fang finds out..." Celine groaned, trying to pick herself up.

--------------------

On the other side of the two-way mirror Celine had nearly been shot into, Dr. Fang just grinned to herself as she stroked her cock rapidly, the herm's labcoat open at the front. "Quite the contrary...!" she mumbled under her breath, "I'm... very happy with... these results...!"

With a gasp and a moan that she muffled by putting her free hand over her muzzle, Dr. Fang bucked her hips as she reached her climax, spraying her side of the one-way glass with her cum, even though her entire load couldn't come close to the one blast that Gabe had shot onto the other side of the glass. She kept jerking herself until her orgasm ended, then took a deep breath and exhaled. "Those pills were much better than expected... I amaze even myself sometimes."