The room looked somewhere between a dungeon and a laboratory, and that was exactly the point. All the walls were stone. One wall was lined with iron hoops set into the rocks and a variety of frames and bars and clips and harnesses meant for bondage. The other was lined with shelves of beakers and cauldrons, jars of reagents, a workbench and a small stove.

It was more of a toy set than an actual laboratory, Linza realized as she inventoried what was available. But that was all well and good—she didn’t plan to do much actual alchemy that day.

Tanyth took the lead on getting Grun set up, fitting the half-orc in a harness and then buckling leather cuffs to his wrists and ankles. There were eight ropes clipped to iron hoops, four on either side of the wall, and each leading back to a pulley and a locking mechanism.

Tanyth loosened four of the ropes, two on each side, and clipped them to Grun’s wrists and ankles, letting him get a feel for it.

Linza helped to tighten the ropes according to Tanyth’s instructions. The ropes passed through several pulleys, meaning that she’d have a significant amount of leverage, even over someone as strong as Grun. But to start, they left a good bit of slack in the ropes. 

Grun could still stand comfortably, but he wouldn’t be able to cross his arms across his body. And, most importantly, he wouldn’t be able to touch his shaft, which was already half-erect and throbbing.

Tanyth stepped back and nodded, admiring their handiwork.

Both they and Linza were wearing lab coats of bleached cotton to complete the look.

“Thank you very much, my lovely assistant,” Linza said to Tanyth. “This is quite the specimen.” Linza stepped up and ran her fingertips from Grun’s cheek, down over his chest, to just above his shaft. He shivered. “He shall do quite nicely. However did you find him?”

Tanyth giggled. “I made lewd noises, and he came running. He’s very sexually motivated.”

Grun huffed and pouted. “Hey, just because it’s true...”

“Do you have the list?” Linza asked Tanyth.

Tanyth bounded over to the workbench and returned with a piece of parchment clipped at two corners to a wooden board. “I do!”

“What’s first?”

“Initial preparations. Non-genital stimulation.”

“Ah, yes, thank you.” Linza stepped up to Grun, keeping her air of disinterested scientist but loving the wary look on his face.

“W-what do you want from me?” Grun asked, though he already knew.

“Just some samples.” She brought her fingertips to his chest and swirled them there. She lingered on his nipples, running circles and making him gasp, and then swept her hands down over his hips.

His erection bobbed to full hardness.

Tanyth joined in and together the two of them touched every inch of Grun’s body that wasn’t his actual cock, balls, or rim. Linza trailed kisses up his arms. Tanyth ran their tongue around the edges of his hips, over the shallows of his pelvis.

Grun was shaking and gasping in no time, and they continued for several minutes.

Tanyth checked the clock and withdrew, going to pick up their list again. “Alright, it’s time to begin. Experiment number one: tip stimulation only.”

“T-that wasn’t the beginning yet?” Grun moaned. 

Linza gently took the tip of his shaft in her fingers and circled her thumb right under his head.

Grun managed a brief attempt at composure before he moaned and gave in, his shaft throbbing under her fingertips.

“Note the time and bring the sample tube, please.”

Tanyth jotted down the time on the first entry on the paper and fetched one of the sample tubes. They were finger-length and clear glass, open at the top and closed at the bottom, arranged in a rack. Linza had already labeled them with numbers, and Tanyth fetched the first one.

Grun quivered at the teasing sensation, but so far, he behaved. Linza was curious to see how long he lasted. It clearly felt good, but it would leave him begging for more.

After about five minutes of tip-only stimulation, he shuddered against the ropes and rewarded Linza with a bead of pre-cum at his tip. She gently took it with the edge of the sample tube and he shivered at the cold touch.

“Excellent,” she said. “How are we on time?”

“It’s time to proceed to the next one.”

“Which is?”

“Half shaft stimulation.”

“Excellent.”

Tanyth jotted down the time again and traded Linza for a fresh sample tube.

This time, she wrapped her fingers around him and stroked the fore half of his shaft, his foreskin sliding easily under her touch and providing significantly more sensation.

Grun shuddered against the ropes again, leaning forward and trying to bring his bound hands towards his cock.

Linza kept the sample tube to his tip and milked out several more drops before Tanyth called out that it was time for the next phase.

“Testicles only!” Tanyth cheerily called.

“You’ll hold the sample tube for this one?”

“Yes, of course.”

Linza pulled up a stool and sat before Grun. He was tall enough that she didn’t really have to kneel. 

Tanyth readied themselves at his tip, careful to not provide any stimulation there.

Linza looked up at Grun and licked her lips.

He twitched in anticipation.

Then she cupped his balls in her hands and licked them, covering as much of him with each stroke of her tongue as she could.

Both male and female anatomy developed analogously, female being the ‘default’ and male genitalia developing in response to testosterone during fetal development. The head of the penis was analogous to the clitoris, though the clitoris had even more nerves than the head and shaft of a penis combined. Most interesting to this current activity was that the scrotum, which housed the testicles, was analogous to the outer labia.

So Linza understood, with deep empathy, how just this sensation could send Grun moaning and gasping even more than teasing his tip and shaft. When Linza was receiving oral sex, that’s how she liked it to start. First, with the labia and then proceeding to include the clitoris, but never neglecting the labia.

And she enjoyed the paradox of their scientific demeanor and how she was now practically worshipping his balls, licking and sucking and moaning.

Grun again attempted to reach for his neglected shaft, straining against the ropes that held his arms apart. To no avail. He might have tried to twist more, but then Linza would have simply stopped touching him at all.

Tanyth called time, and Linza reluctantly withdrew.

She checked the sample tube as Tanyth held it to her, and she was excited to see that there was nearly a milliliter of clear fluid. “My, what an excellent sample!”

Grun groaned. “I-if you want my cum, I can cum…”

“Oh, no, of course not! That won’t be necessary. It is actually the pre-cum that is of greatest interest to us today. Exotic pre is in quite the high demand, don’t you know. We’re looking for the most efficient harvest methods.”

He grumbled, “If you want pre you should play with my ass…”

“Ass play starts with item ten,” Linza sunnily reported.

“Ten?!” Grun suddenly looked truly desperate.

“I believe we were just about to start number four. Our specimen is getting unruly though. I think we’d better tighten the restraints. For scientific integrity.”

Tanyth nodded. “For scientific integrity. Fifteen rotations should be about right.”

Linza and Tanyth went to each side of the wall.

“T-that won’t be necessary, I can be ruly,” Grun said.

Linza and Tanyth paid him no mind, and each spun their crank fifteen times, which pulled about six inches of slack out of each of the ropes at Grun’s arms. He could still move his arms, but they could no longer rest by his side.

Tanyth checked the list. “Four is half shaft stimulation, base half.”

That one really got Grun wriggling, and Linza was glad they’d tightened the ropes. Mostly, he couldn’t help but thrust into her hand, primal instincts activated by the pressure at his base.

“Greedy, aren’t we?” Linza teased.

“F-fuck, I really can’t help it when—”

She squeezed his base, and his hips bucked again.

“—when you do that…”

“This might interrupt collection. Assistant, could you please help me limit our specimen’s pelvic motion?”

“Certainly.”

“W-wait, what?”

Tanyth went around behind Grun. He was wearing a harness across his chest that had loops at his upper arms and upper thighs also, and a belt-like band around his waist. Tanyth clipped a ring at the back of the harness to an appropriately placed iron ring in the wall.

Grun pulled against it. The harness dug into his skin, but the iron didn’t budge, and he could no longer thrust his hips forward.

Even though Linza knew exactly what was next, she said, “Alright, assistant. Five, please?”

“Five is the application of a cock ring, and then we repeat one through four with the cock ring on as six through nine.” Tanyth fetched a strip of kid leather and handed it to Linza.

She nodded and returned to Grun.

“I-I don’t know if I can take much more of this,” Grun said.

“Well, we’ll find out, won’t we?” Linza grinned. “That’s science!”

Grun gulped. “Yay… science…”

Any further protests evaporated when she swept the strip of leather behind his balls and around his base. The leather towards his skin was soft, but there was a firmer strip of leather on the outside with a small buckle. She situated the leather and then gently tightened it until she could no longer slip a finger behind it.

This presented his balls forward, and his cock throbbed even harder.

“F-fuck that’s tight…”

Linza put her hand on Grun’s thighs and found his eyes. “Is it alright?”

He nodded. “I l-like it tight.”

Linza grinned. “You certainly do when I ride you.”

Grun’s hips bucked, but the clip held him in place.

Linza grinned and turned to Tanyth. “Note a slight modification for item five — instead of just letting him sit there with this on, I’m going to say lewd things.”

Tanyth nodded dutifully as Linza picked up the corresponding sample tube.

“C-c’mon,” Grun said, “You can’t do this to me…”

“I can do whatever I want to you.”

He twitched again, his eyes softening.

“Just imagine how much pre you’ll drip if I keep you like this for hours.”

He bucked against the harness, releasing a drip that Linza collected with the cold, smooth edge of the sample tube.

“If I just never let you come… why, I expect you’d practically become a faucet!”

“We’d be rich!” Tanyth chimed in.

“N-no please, can’t you use my cum too? I’ll still have plenty of pre after…”

“Hm, assistant, I think the specimen may be trying to compromise our scientific integrity.”

Tanyth nodded, their blue ponytail bouncing. “I quite agree. I think I know of a way to remedy this situation.”

They returned with a ball gag. Linza had to help steady them as they stood on a stool to buckle it around the back of Grun’s head. The gag showed off his pointed canines, and Linza thought the effect was quite cute. Especially when he immediately started drooling.

“That’s much better,” she said. 

Grun grumbled under the gag.

“Alright,” Tanyth said, checking the list. “Back to head stimulation only!”

Between the heightened sensation from the cock ring and the fact that they’d been at this for almost a half an hour, Grun was a trembling, moaning mess. He whimpered as she stroked his tip, then groaned with relief as she stroked the fore half of his shaft. Those yielded half a milliliter and a full milliliter of sample, respectively. 

When Linza descended upon his balls, so tautly presented for her oral pleasure, she thought he might actually pull his way out of the cuffs. He moaned and drooled and shook. So desperate.

And yet, Linza and Tanyth carried on diligently collecting their samples, grinning to each other.

Her hand at Grun’s base had him bucking uncontrollably. Only through Tanyth’s deft maneuvering of the sample tube did they manage to collect everything.

“And now we’re to ten!” Tanyth said.

Linza grinned up at Grun, whose eyes were glassy. “Do you remember what ten is?”

He blinked at her.

“Ten is when we start ass play.”

His hips bucked, and he shook against the ropes.

Tanyth went to the other side of the room and wheeled over an armature, similar to the one that had propped Linza up for spit roasting, but much larger. Tanyth expertly manipulated it into the shape that they would need for their next set of experiments.

Linza had asked Grun ahead of time whether he preferred the carrot or the rod, and he significantly preferred the carrot.

So, she came up to him and started stroking his full shaft as Tanyth unclipped his wrists and ankles. Grun’s arms fell limply at his sides.

Now that she had his pleasure in her hands, she controlled all his attentions. “Come this way. You wouldn’t want this to stop, would you?”

He shook his head, and she led him over to the armature and guided him to kneel against it. The end result was as if he’d leaned himself over a table. His ass was up in the air, his legs parted, and the armature gave him a place to rest his knees so he wouldn’t have to hold up his weight.

Tanyth clipped Grun’s wrists and ankles, and harness into place on iron hoops set into the armature. Grun’s cock hung down into the open part of the armature, easily accessible.

Grun had hardly noticed. His drool ran onto the floor now, and his face was soft with bliss as Linza stroked him. 

Then she stopped. His eyes flickered open, and he seemed to realize where he was. He pulled against his bindings, but the armature remained solid.

Linza fetched a stoppered vial and opened it, pouring half of the contents out over Grun’s raised ass. He shivered at the cold and moaned with anticipation.

Tanyth fetched a sample tube and positioned it under Grun’s twitching cock. “Number ten! Manual stimulation of the anus.”

Linza placed her fingertips thusly, and Grun dissolved under her touch. He moaned and shook. Tanyth nodded eagerly up at Linza, indicating that the sample was coming along nicely. Linza had previously noticed that Grun became a veritable dispenser of pre-cum when his ass came into play, and her scientific excitement wasn’t all for show. It really was fun to see just what pushed his buttons, so to speak. Of course, amount of pre-cum wasn’t really a direct correlate to amount of pleasure—an electric shock to the appropriate gland would be an unpleasant but effective way to trigger its release—but Grun gave plenty of indications of his happiness.

Had they not been timing the ‘steps’ of the ‘experiment’, Linza would have quickly proceeded past this stage, eager to get Grun really going. But, the precise timing was part of the fun. Stretching out each stage. The pleasurable dread of knowing that any ‘end’ was quite far away.

Tanyth called the time, and Linza withdrew.

Though, Tanyth hesitated from their place at Grun’s shaft. “What… should I do if he hasn’t stopped dripping?”

Linza crouched down to watch. There were already two milliliters in the tube and, sure enough, another droplet formed at his tip. She grinned. “I’ll help you swap it out as we go to the next one. You stay here for a sec.”

She came around to Grun’s face, unbuckled the gag, and set it aside. She rubbed his cheeks with her fingertips as his head lolled against one of the padded panels of the armature. 

He wouldn’t be protesting any more, and it was important that he could tell them if anything was uncomfortable. Especially because the next thing she fetched from her bag was a glass dildo. She coated this also with lube. Then she swapped tubes with Tanyth, set the used one back in the rack, and stepped around to Grun’s ass again.

Linza winked at Tanyth and so they didn’t call this next one out. Grun hadn’t seen her latest preparations—he was too hazy.

So when the cool glass touched his rim, he gasped.

“Fuck,” he moaned. “Fuck yes, yes please…”

Linza pressed the tip gently inside.

Grun arched his back towards her, groaning and grasping at the padding under his fingers.

Linza pressed in a little more. And then a little more. And then much to his chagrin and her satisfaction, she held it there as he shook and whined and quivered for the remaining minutes of that experiment phase.

Tanyth quickly swapped sample tubes again, and Linza saw as they swept past that this tube was the fullest yet.

Experiment twelve was slow, deliberate thrusts centered on his prostate. Thirteen combined those thrusts with Tanyth stroking the tip of Grun’s shaft. Both produced ample samples.

“Aren’t you a pretty little milk maid?” Linza said, leaning down towards Tanyth.

Tanyth beamed.

Grun moaned and panted.

“Oh, do you like that?” Linza teased. “Us milking you?”

Grun shuddered.

Tanyth nodded. “Well, it’s working quite nicely.”

By the time experiment thirteen was done, Grun sounded like he was already edging.

The pause between would be torture, and Linza took her time fetching a new tube for Tanyth.

Experiment fourteen was harder thrusting, a proper fucking, but without shaft stimulation. That offered the most pre of all, nearly five milliliters. Tanyth reported that it was no longer dripping, but coming in spurts.

Linza insisted that more data was required, and she traded with Tanyth so that she could see for herself. Grun was dripping constantly. Every few strokes, he would groan and quiver and clench around the dildo, and a spurt of pre splash into the sample tube.

Linza’s scientific integrity was wavering. Fortunately, this was nearly the end of what she had planned. “Wow, you are really dripping.”

“Yes! I know… I can f-feel it… nnngh…” He moaned and spurted again. “…coming out…”

“These are even better results than we had hoped for,” Linza said, staying in character even as her own sex throbbed. “We may have found a winner, dear assistant. This far exceeds our theoretical predictions and has proven to be a very effective milking method.”

“N-no, please!” Grun whimpered. “I need to come… please… Fuck! nnngh…”

“I have studied your species and confirmed that this collection method is quite safe, even for long periods of time, so you need not worry,” Linza said.

“No… no it’s not, I…” He tried to pull against the restraints, but Tanyth was still fucking him with the dildo and Grun couldn’t manage more than a weak effort.

Making sure that Grun couldn’t see, Linza returned to the lab bench one more time and swapped out the sample tube for a wide-mouthed beaker.

She kneeled under Grun and held the beaker under his dripping cock. Tanyth fucked him vigorously.

“Fuuuuuuck,” Grun moaned. “That f-feels so fucking good…”

As Grun continued dripping, Linza ran her palm over his tip and caught the slick fluid on her hand, using it to lubricate his shaft. She could have gotten the actual lubricant, of course, but Grun was already producing plenty and she thought he’d like her doing it like this. She certainly liked it.

And he sounded like he was loving it. He gasped and panted as if already on the edge.

Every time he dripped his shaft became slicker, and the slicker it got the better it felt, and the better it felt the more he dripped.

“F-fuck that’s so good…” He gripped the padding under his fingers and arched his back, breath heaving. “I c-can’t… I need to… please… I’m so close… I’ve b-been so close…”

Linza glanced at the clock and grinned as she realized she and Tanyth had been teasing Grun for nearly an hour.

Linza propped the beaker into the armature in an appropriate spot and slicked her other palm on his pre, then brought one hand up to fondle his balls, which were still plumped forward by the cock ring.

“Oh! Oh fuck… fuck… oh gods if you do that I… that’s gonna make me… fuck, fuck, please don’t stop, please don’t stop, fuck, fuck me, fuck me!”

Tanyth seemed just as affected by Grun’s display as Linza was, and their cheeks and ears were rosy with arousal as they fucked Grun as hard as they could.

Grun’s breathing quickened. “Oh gods I can feel it, I’m so close, I… Fuck, fuck fuckfuckfuck!”

Grun’s balls tightened under Linza’s hand, and she quickly reached for the beaker as she continued stroking him with the other hand.

The first spurt was so powerful, it nearly splashed out of the beaker. For science, as well as her own edification, Linza counted. Ten more waves, his shaft pulsing under her fingers with each, each as thick as the last, until he finally slowed to a drip.

It was at least twenty milliliters.

Linza felt like a pretty little milk maid indeed.

Tanyth gently withdrew the dildo, and Grun moaned and shivered. Linza handed the beaker to Tanyth, and they admired the volume as she unbuckled the cuffs from Grun’s ankles and wrists.

Grun moaned lowly and seemed disinclined to move.

Tanyth sidled over to Linza. “Something has just occurred to me, great alchemist.”

“Oh yes, lovely assistant?”

“We need exotic cum, right?”

“That’s correct.”

“I can’t believe I neglected to mention this earlier, but I have exotic cum, you see.” Tanyth batted their eyelashes at her as their erection tented the front of their lab coat.

Linza chuckled. “Oh, well then I’d better collect a sample, hm? Comparative analysis is important.”

Tanyth nodded enthusiastically and unbuttoned their lab coat. 

Linza reached back and grabbed one of the unused sample tubes. She started with her mouth, running her tongue under their tip, then stroking with her free hand. 

Tanyth gasped, sighing with relief.

As with Grun, their relief soon turned to urgency.

She kept at them with her mouth until they whimpered, and then she dropped her attentions to their balls.

They stroked themselves, still slick with her saliva.

She pressed her tongue at the base of their balls, just at the edge of their perineum.

“Fuck! Linza, Linza—”

Linza leaned back and aligned the tube, and Tanyth did their best to stay still, stroking gently as they supplied their sample. 

As Tanyth heaved a sigh of relief, Linza leaned in and licked their tip, causing them to yelp.

Linza chuckled and withdrew, placing the tube on the rack next to the others. She was amused to see that, just like she had suspected, some of Grun’s tubes of pre-cum had more volume than Tanyth’s whole ejaculate.

Grun had stirred during her time with Tanyth and now unbuckled the harness as he regarded the rack of test tubes. “Wow, is that… really all from me?”

She picked up the beaker and swirled it. “Sure is.”

He rubbed the back of his neck. “I mean, I always appreciated how much you manage to swallow but… now I really appreciate it.”

“Knowledge is power,” she said as she jotted down the exact volumes from each of the labeled tubes onto the sheet where Tanyth had been noting the times.

“Wait, you’re actually writing it down?” Grun said.

“Of course I am. I’ll need something to compare back to, next time.”

“Ne… next time?”

“Only if you want to, of course.”

Grun chuckled. “Ask me tomorrow and you’ll get a resounding ‘yes’. For the moment, I think I can actually say… I don’t feel remotely interested in anything sexual. And that is a miracle.”

Linza grinned, thoroughly pleased with herself. “A miracle of science.”