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Eva was unsurprised when she woke up again in the specially-built seat.

It had been almost a week now that she'd been being kept as a pet to the mysterious Mr. Zance, and already it was getting hard to remember anything from her life prior to being the stallion's private fucktoy, his test subject for his sex machines. She'd been being milked daily by his milking device, but the last time he'd finished a session with her, before she passed out from exhaustion she had heard him say that next week he'd be using her to test a new prototype, a much different machine, the cutting edge of sexual technology. Mr. Zance had made it clear that he wasn't out to harm Eva, but nonetheless she was helpless to his whim to aid him in his quest to create these intense machines. She might be his sexual prisoner but at this point it was almost starting to seem normal to her. What was wrong with her? The part of her that was enjoying this treatment grew stronger and larger every passing day...

The clack of a stiff light switch followed by the flicker of the overhead lights turning on had stirred Eva from her delirious stupor, and looking to the doorway of the lab Eva could see Mr. Zance and his vixen assistant Val appear, each entering the room and stepping closer to Eva as she waited, restrained.

"Hello there, little pet," Mr. Zance murred, smirking ever so slightly at Eva as he stood before her. "You're a lucky little lemur...we have a special experiment ready for you this evening."

Eva realized that, contrary to how Mr. Zance usually prepared her for his experiments, she was not equipped with her usual ball gag today. She took the rare opportunity to speak to him.

"W-what is the new experiment?" she asked softly, blushing brightly already. Though she may have been getting used to Mr. Zance's strange treatment, she still had a modicum of modesty left, and couldn't help just a slight twinge of embarrassment as Mr. Zance and Val stood before her in her restrained and presented position, nude and on display. Her cock already had begun to stir from its sheath at Mr. Zance's presence, her mind filled with thoughts of what he might possibly have done to her next. She was conditioned.

"You'll find out soon enough," Mr. Zance said with a sly chuckle. "Val, if you would be so kind as to bring in the device...we can get started."

"Absolutely, sir," Val murred, stepping back to the area behind Eva and out of sight temporarily. Mr. Zance crossed closer to Eva and reached out with his paw to cradle Eva's testicles wrapping his fingers around her delicate sack and giving them a firm tug. Eva gasped and tensed, but Mr. Zance's touch only caused her growing erection to swell larger still, her cock sliding further out of its sheath.

"We'll be giving these a little break from our rigorous milking schedule today," Mr. Zance said as Val appeared again, wheeling a small, squarish machine into view. She engaged a number of kickstands to steady the device, locking them into place with corresponding mechanisms on the floor. She stood back up when she was done and nodded to Mr. Zance.

"This one is pretty simple and automated," Mr. Zance explained, relinquishing his grip on Eva's balls and taking the liberty of applying a generous amount of lube to Eva's tailhole, sliding a slick finger into Eva's entrance. She stifled a soft moan at the feeling, and her eyes were drawn toward Val as she heard her press a switch on the device. "Let's see what happens, shall we?" Eva knew inquiring further would be fruitless and she would simply have to see what the device was capable of firsthand. Her cock quivered in anticipation.

On the top side of the machine a small shutter opened up and a metallic, segmented tendril of sorts rose out of the opening. It extended upward a few feet before turning its trajectory sharply toward Eva. Her eyes went wide as she watched it approach her.

"W-what is this thing?!" she gasped, watching as it moved closer with strangely robotic precision. Mr. Zance and Val only laughed as Eva tried her best not to panic. The tendril continued to extend, the device whirring softly as it extended toward her. It was only about an inch thick, but it continued to unveil more and more length.

"Eep!" Eva squeaked as the tendril touched to her tailhole, not pausing its intrusion in the slightest as the tip pressed past her puckered ring, inch after inch disappearing into her rather slowly, entering her at about an inch every few seconds. At this point Eva thought this actually felt pretty good, but beneath the pleasure she felt she had the misgivings that stemmed from the fact that Mr. Zance's device must have some sort of unusual quality to it. A minute passed by and she realized that the flexible robotic tentacle that the machine was inserting into her was still entering her, and showing no signs of stopping anytime soon.

"Why isn't it stopping...?!" Eva gasped nervously, failing to hold back a moan as the machine pushed further and further in. She'd never been penetrated so deeply.

Mr. Zance only smirked and Val laughed, shaking her head. "That's the whole idea, little girl. It isn't going to stop."

"What?!" Eva cried, horrified.

"You heard me. Mr. Zance designed this to impale your pretty little body end to end. Just wait and see...it shouldn't take too long."

Eva groaned and shifted as much as she could as she felt the tendril push further and further in, a deep fullness spreading through her abdomen. She could feel every squirm and slither of the machine's probe within her as it systematically penetrated her insides. This thing was really going to skewer her...all the way through...Eva couldn't even think of words to protest as she arched her back, feeling the tendril turn and push within her, her belly starting to distend slightly as it filled with foot after foot of the machine's tool. Her tailhole squeezed tightly around the advancing shaft, quivering and twitching at the unstoppable invasion. Eva whimpered as the tendril squeezed higher and higher through her body, at this point having snaked through much of her intestines, her body stretching to accommodate it.

"Why..." she moaned, grimacing as the violation continued. "Why are you--"

But Eva's feeble protest was cut short with a gasp as she felt a rising pressure in her chest, gagging and involuntarily throwing her head back as the tendril pushed higher still--it had penetrated up beyond her stomach, entering her throat. She was almost completely impaled by Mr. Zance's machine. Eva couldn't talk anymore even if she wanted to as the end of the tendril forced her mouth open. She moaned indistinctly as she watched the tip of the probe extend out in front of her face from her mouth. She could hardly believe it, the reality of it made all the more vivid by the extreme feeling of fullness, the pressure throughout her entire abdomen and chest, and the sensation of the tendril sliding slickly up her throat. Even maintaining her ability to breathe at this point was difficult, but despite the horrific strangeness of what was being done to her, Eva could feel an intense throb in her cock, her supremely erect member twitching out of reflex in reaction to the penetration. A weak, muffled moan escaped her as she watched Val approach her. She could barely turn her head but saw the vixen unhook several of the restraints keeping her bound to the chair. One by one her limbs were set free, and the tendril shifted, bending and lifting Eva up in to the air, passing her over the top of the machine and flipping her so she hung face-down, parallel to the ground, her face pointed toward Mr. Zance, who looked on, still smirking. Eva gagged and sputtered softly, trying her best to keep her breathing even while she was suspended over her onlookers, held up only by the machine's long protrusion. Mr. Vance stood and looked her in the eyes as she was held at eye-level with him.

"Couldn't have turned out better, could it," he murred, his smirk breaking into a sly grin. "Val, give our little toy a reward for being such a good guinea pig for this prototype, won't you?"

Val nodded. "As you wish, sir."

Eva didn't know what to do with the rest of her body, effectively immobilized by her skewered disposition. Her cock dangled down underneath her, twitching and rock hard--her brain didn't know what to do with the sensation of such complete penetration, but she tensed as she felt Val's paw around her cock.

"Mmmhhhffff..." Eva moaned, squirming to what small degree she could, her arms flailing weakly and her toes curling as Val reached up to stroke her cock from below. Eva could feel the vixen's paw gripping her shaft tight, perfectly lubed to pump her member rapidly. The lemur's reflex to arch her back from the pleasure was met with resistance from the probe within her body, only adding to the pressure it exerted on her. Eva's tailhole was stretched around the shaft of the tendril, squeezing firmly around it rhythmically with each twitch of her cock in Val's paw. Val gave Eva's balls a soft smack as he paw relentlessly tugged the lemur's rod.

"Nngglhhhfff!!" Eva gurgled, her body jumping slightly at the tap to her sensitive sack, a thick spurt of precum dribbling from her cockhead onto the floor as Val gripped the lemur's balls now, squeezing and massaging them while stroking her shaft, tugging from base to tip again and again, milking Eva's member like the teat of a cow. Eva shuddered, whimpering and moaning indistinctly as Val's attention brought her closer to climax.

"Stop," Mr. Zance spoke, still looking Eva in the eyes the entire time Val had been masturbating the poor lemur. Instantly Val relinquished her grip on Eva's cock, but still held her firmly by the balls.

"Mmmhhffhmmhhhhhmmff...~!" Eva groaned in frustration, her eyes rolling in pained pleasure as Val ceased her onslaught, her cock throbbing so hard it ached, twitching distinctly with every beat of Eva's elevated heart rate.

"Last week was milking week, little girl," Mr. Zance said, reaching up to scritch under Eva's chin with his fingertips. "We'll be saving up that cum of yours for another day."

Val punctuated Mr. Zance's statement with a tighter squeeze of Eva's testicles. The lemur let out an uncomfortable squeak as Val then released her.

"It's time to withdraw," Mr. Zance said, nodding to Val who flipped another switch on the device's controls. The tendril shifted once more, flipping Eva back over and lowering her down until her back touched the seat from which she had been lifted. Val quickly strapped Eva's arms and legs back into the restraints and secured her body to the chair. The tendril began to retract.

The metallic tentacle that had impaled Eva now moved in reverse, the tip that extended out a few feet out of her mouth slipped back down her throat, disappearing as though she'd swallowed it. Eva coughed and wiped her mouth, panting softly as she could breathe properly again. Dazed from the ordeal, Eva thought that this machine's retreat felt far less strange than its invasion--after all, her body was designed to have things move through it in this direction. As the probe pulled lower and lower through her body she squirmed, writhing against the restraints at the unfamiliar sensation as it snaked through her insides, the pressure of its presence being relieved, sending a sort of exhausted rush through her body.

Panting, Eva looked down at her body as the machine continued to retract, watching her swollen belly return to its original slender state as it was filled with less and less of this machine's length. She uncontrollably arched her back as the last few feet of the tendril pulled at her tailhole, then finally the tapered tip of the machine exited her body. She was free and empty at last. She could feel her tailhole twitch, quivering as it was allowed to relax once more. Eva closed her eyes with a deep sigh, tilting her head back in relief.

"Th-that was..." she gasped, at a loss for words. "That was insane...I-I don't even--nyahh!!"

Eva's thought was cut short by a sharp slap across the head of her cock. Her eyes shot open to see Mr. Zance standing in front of her. She swallowed hard, falling silent, her throbbing cock jumping and dripping with precum as she looked up at the stallion.

"You keep your pretty mouth shut unless I say so, little girl. And as it stands, this is only day one. This was a trial run to make sure the device worked and that it could penetrate you fully and thoroughly without breaking either itself or you. While both you and it passed this test, I still plan on putting this thing through you many more times. We're only through the warmup," Mr. Zance murred seriously. "By the end of the week you'll be being fucked end to end, your entire body pounded by my machine. We'll run it in the opposite direction. Hell, I've even got bigger, thicker probes commissioned. Now I'm feeling generous enough to give you a break for now...but we'll be running plenty more tests of this thing this week, understand?"

Eva nodded fervently, knowing Mr. Zance would back up his claims. It seemed as though the stallion ran his lab on a schedule, with a week of testing for each of his devices so far.

"And as for this sad little cock of yours," Mr. Zance said, pinching the head of Eva's member and tugging it sharply. Eva did her best to stifle a small squeal of protest. "As I said, last week was your lucky milking week...we've got to save up your cum this week, I want these balls to be swollen full of it by the time we're ready for the next device." He slapped Eva's balls with a sideways swipe of the back of his paw.

"Nhhaaaahhhh!" Eva cried out, a jolt of vibrant pain surging from her crotch through her legs at Mr. Zance's rough treatment of her poor package.

"Val will outfit you with a nice little cage for that cock before we put you to bed tonight. As for right now, we've got to clean up the machine for your next run. I hope you're ready to put on a good show for us..."

Mr. Zance chuckled and walked away to exit the lab as Val began to service the probing device. It would be another long week...