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This story was written as Day 29 of Kinktober 2019 for Shakal. Today's theme was Machine-sex, and the story contains sexual acts between a male anthro and a very realistic fucking machine. :3

The First Tru-Cock

Tobi giggled as he trotted over to the large X marked in duct tape upon the lab's floor, and rolled his eyes playfully as he glanced around the room, realising that there really was no other place he could realistically have stood anyway, rendering the whole point of the X null and void beyond another way for the scientists in charge to feel like they were leading a rigorous scientific procedure. And, in a way, given that nature of this test, the rabbit supposed that they were. But, he wasn't here for science. He wasn't here to better the world with new technological innovations. He, and his ever needy ass, were here to get fucked.

Placing his feet upon the requested spot, Tobi leaned forward, and laid his upper body out upon the comfortable, angled surface provided to offer his upper half maximum support while at the same time keeping his ass free and clear for its own purposes. Wiggling slightly upon the padded surface to get himself perfectly comfy, the rabbit soon reached down and without waiting to be told hooked his thumbs around the slim waistline of the thong he was wearing. Wiggling his ass and raising his tufted tail partially to make it easier to slide down his underwear and in part to give the scientists no doubt recording every detail of this interaction a good show, Tobi teased the thong off his slender, twinky body and let it fall around his ankles. Even once it was kicked playfully aside though, he kept on swaying his hips. He spread his legs just enough to let his ass show off its rounded fuckability a little more, and wiggled his backside and his tight, swollen balls temptingly at the scientists, their recording equipment, and of course, at the machine set up just behind the big X on which he was standing; the entire reason why he was here.

Attached to a mobile mechanical arm covered in white panelling to make it look sleek and futuristic, there rested what looked for all intents and purposes like a flaccid but sheathless horse cock. Of course, that in itself was a mark of success in the scientists favour, because Tobi had to admit that it really did look like the real thing, not like rubber or silicon or any other material traditionally used for dildos, but like flaccid, living flesh. Playfully, Tobi leaned back away from the padded surface on which his upper body was lying, and for just a moment he jiggled the cheeks of his buttocks against the very tip of that toy where it lay at rest, presumably waiting for the scientists to activate it. He murmured in approval at how warm it was, not just warm like the ambient temperature of this lab's air, but warm like body temperature. His ass wiggled against it a little more, and the bunny only stopped teasing the toy with his buttocks when an intercom crackled into life, and a rather stuffy, bashful voice nervously made a request of him.

"U-um... could you please, uh... please refrain from unplanned stimulation of the test device. Return to your prior resting position, and soon we will begin the..."

The voice talking through the speaker trailed off as Tobi heard another voice calling out from somewhere much further away from whatever microphone the scientist had been speaking into. A few seconds later, the first voice spoke again.

"What do you mean it's turning on?"

At that moment, Tobi heard a whir from behind him, and he looked around to see the mechanical arm to which the dildo was attached shift and pivot slightly as though testing its motor control.

"What do you mean, you didn't do it? This room is the only one wired in to control the arm. If you aren't, then..."

The bunny stopped listening at that point, and whimpered softly as not only did the mechanical arm continue to move, but he felt something warm brush up against his ass, rubbing between his cheeks and against the base of his tufted tail. He turned his head once again, and a soft gurgle of excitement escaped him as he watched the tip of a decidedly less flaccid than before equine cock grind up between his buttocks and into view as he twitched his tail to one side. It slid back down again, then up once more, stiffer, more swollen than ever.

"Sir, we need you to step away from the X and exit the room. We're having some... technical difficulties up here."

Once more the scientist spoke, but Tobi just giggled and wriggled his ass back against the machine.

"O-oh... you've got a mind of your own, haven't you..."

He moaned, rolling his eyes as once again the scientist began to repeat his plea, only for a brief, loud whine of feedback to echo through the room, followed by a soft pop as the intercom system short-circuited. A second later Tobi heard a loud thud from the doorway, as though a locking mechanism had just been engaged. He giggled, and laid his body back down again, raising his rump a little higher as his toes curled against the smooth, albeit somewhat tape-covered floor.

"Don't worry, baby. I'm not going anywhere. You just keep them out, a-and... oohhhyeahh..."

The bunny shuddered and gasped as he felt something warm and wet trickling down between his cheeks, not even needing to look this time as he already knew what it was. It was pre-cum. This toy. This hyper-realistic toy he'd been brought in to test, it was oozing in apparent excitement as it ground up against his ass, and by the sounds of things it was doing so entirely outside of the control of those who had made it.

"Mmh, you feel so good. So hard, a-and warm, and... ooohh... nice and slick now, too. But, don't you wish you had somewhere to hide out from all those mean old scientists?

Tobi teased as he rolled his hips, and gasped as for a brief moment the angle of his rocking and the motion of the machine mounted cock allowed his balls to brush against the shaft of that oh so realistic erection.

"I... aahh... I've got somewhere you can hide out. Somewhere snug, and warm, and trust me... I can't wait for you to visit."

He didn't know if the toy could hear him, of course. He didn't even know for sure that the toy was what was controlling things; for all he knew there was some rogue scientist off in a different part of the Valhalla labs testing facility with the controls for the machine in one hand and his own cock in the other. But, there was something about that cock. Something about just how real it felt, how lifelike not only its flesh and pre-cum felt, but its motions too. The urgency behind them, the passion. Regardless of what the truth was, Tobi wanted to believe that it was the cock itself trying to fuck him, if for no other reason then quite simply because if that was the case... then he most definitely wanted to give that cock what it craved.

"Oh. Ohhhgod, y-you're... a-ah, you're a big one, huh?"

Of course, Tobi had known precisely how big the cock he had been scheduled to take today was in terms of dimensions. He'd been selected partially because of his skill at handling some of Valhalla's largest studs and stallions, though admittedly also because he'd spent a good month bottoming for the head of Valhalla Sex Toy R&D despite the otter in question being more of a twink with delusions of grandeur rather than a stud in his own right. But, there was a big difference between seeing some numbers on a sheet of paper and feeling those numbers pressing against your pucker with only its own pre-cum for lube. Thankfully there was a fair amount of that pre, and Tobi moaned and giggled appreciatively as the toy simply wiggled and rubbed at his ass for a good minute or so with its already somewhat flared tip, oozing more and more pre-cum out over his ass before finally it seemed able to wait no longer, and with an increase in the volume of its servos' whirring, the ever so realistic toy began to press its way deep, deep into Tobi's experienced but still deliciously tight, eagerly welcoming ass.

"Ohhfuck. Ohhhgodfuck, t-that's it. Do it. Ohhh, y-you're so thick. Stretch me, baby. Mnnh, give it to me. All of it. Ohh. Ohh yeah, fuck. Fuck, t-that's good..."

Tobi groaned and giggled as his ears flopped forward over his face, normally firm and upright but with a tendency to go a little more loose when he was getting his ass hammered. He bounced upon the tips of his toes slightly, further stimulating the cock inside him and jiggling his ass at the same time, as much for his own excitement as for the potential benefit of anyone still watching. Distantly, Tobi thought that maybe over his own moaning and the whirr of the mechanical arm he heard fists pounding at the far side of the lab's now sealed door, but he pretended not to hear them. Hell, it didn't take much to convince himself that he really hadn't, so completely was his attention already focused on getting fucked as the cock began to slide in and out of him, and to do so harder, faster with every stroke.

"Ah! Aaaaahhhh! Right there! Oh. Ohhh, y-yeah... god!"

The rabbit's eyes widened, his muzzle hung open and his tongue lolled out a little, the goofiest, giddiest grin crossing his face as the cock really started to give his prostate a workout as it slid back and forth along it, the girth of the shaft doing every bit as much as its overall length to drive the bunny wild. He could feel more pre-cum dribbling with increasingly liberal quantities deep into his backside, and at the same time as his own cock twitched beneath him, he too started to drool pre-cum, spotting the ground between his feet with its glistening droplets. Normally by now he would have been pushing back against the cock, fighting to take more. But, this fuck... this wild, ever intensifying fuck, it didn't need his help to be heavenly. All he had to do was lie there with his head down, his ass up, and take it.

"Ohhgod, f-fuck! Fuck me! Fuck me! F-fuufhahhhhahaahhhhgod, yes!!"

He started to beg, to moan, then to wail as the more he seemed to enjoy himself and delight in the rough, ceaseless passion of the toy and the machine on which it was mounted, the more wildly still he was fucked in return. His fingers clawed and scrabbled at the padded surface against which his body was leaning. Saliva trickled down his chin as his eyes rolled back into his head, and the insides of his floppy, entirely loose, limp ears were a veritable shade of crimson as he felt the coolness of plastic brush against his balls, and realised that the toy was starting to hilt itself within him at long last, soon doing so with each and every intense, mechanically driven stroke.

"I... o-oh, god... Mnnnhgnnafuckincum..."

The bunny gurgled, words harder and harder to form, coherent thoughts a strain to produce in even the most brief and internalised capacity.

"Please, I... aa-ahhh, ahhyess... I'm close. I'm g-gonna... you're gonna make me cum. Please, g-god, don't let me do it without feeling you unload in my ass first..."

He fought tooth and nail to force those words from his lips, and was rewarded just moments later as his eyes bulged, and he felt the already huge, thick cock inside him flare obscenely at its tip.

"Oh, god! Y-you were waiting... y-you were... aaahhh... h-holding back? Getting me t-to... to here? Oh. Ohh fuck, g-goddammit... keep this up, y-you keep treating me like that, and I'm gonna have to fight them to let me keep you. Coz, n-nhhh... no way I'm letting you go, if you can do this to me every single.. a-ah... aahhgod... _aaahhhhgod fuck! F-fuck!! _ O-ohh... okay... s-shutting up now. Too fucking horny. T-too... too fucking good!"

Tobi giggled, shivered, and with that, surrendered his capacity for speech. He let that part of his brain join the rest already so devoted to enhancing and processing all the pleasure he was experiencing, and just seconds later he was immensely glad of that fact. He didn't need to speak to share what he was feeling in that moment. He didn't need words to express his joy, his passion, his ecstasy as for a good ten seconds the cock and the mechanical arm driving it went into overdrive, jackhammering his already liberally stuffed and tender ass to new extremes. His screams, mindless, wild, frenzied in their euphoria did that job all the better without the slightest trace of meaningful language behind them, and when just seconds after that the vast, hyper-realistic dildo buried itself to the hilt inside of him once again, throbbed, strained, and began to unload copious ribbons of hot, thick, not just realistic but real cum deep, deep into Tobi's backside, his final squealing, gleeful, rapturously orgasmic wail exceeded all that had come before by at least an order of magnitude.

" Nnnnhnhhhhnnahhgghhghannhhhhhgagghhhhhhhggffffhhhhhhhaaaaaaaaaaaaaaahhhh!!!"

As his own cock twitched and jerked, throbbed and began to cum totally hands free, lashing the base of his padded resting place with powerful, potent strings of his own cum, the rabbit didn't stop screaming, didn't stop wailing in ecstasy for a single moment of it. That one almighty cry rang out from before he started cumming until after he was done, and continued until the equine erection letting loose within him ceased its own eruptions a good twenty seconds after the culmination of Tobi's own peak. Before he could reach that end point though, before he could stop screaming and collapse limp, spent, well and truly fucked though, the rabbit still had to make it through his own orgasm while conscious. He still had to shriek and squeal and shudder his way through his cock spasming and cumming while the vibrations of the mechanical arm's motors buzzed at the back of his balls and the cock throbbing and spurting deep within him kept on stimulating his prostate over and over and over as he began to leak, as his ass and the cum filling it began to overflow.

Eventually, it did end.

Eventually the huge dildo was done, and its twitching ceased, though its girth and length remained buried deep, deep inside the rabbit.

How long they rested together, the bunny and the cock, he didn't know. Five minutes, ten, an hour or more, just revelling in what they'd shared and not daring to part, for fear that they might never be able to repeat the process again.

All that Tobi did know was that at some point, there was a third figure in the room with him and the cock. No-one had entered. No door had opened. But, as he raised his head and opened his eyes, he was already aware of the presence, and so too, given its renewed twitching inside his ass, was the cock.

"Hello, Tobi."

The black jackal smiled at the rabbit, who stared, whimpered for a moment, and shuddered as he swore he found himself just a hair's breadth away from cumming again, just at the sound of that figure's voice.

"Thank you for your help today. And... for your understanding. It seems that the boys in the lab here have... gone a step further than they intended. A step further than even I intended to let them go."

The jackal stepped forward, knelt down beside the mechanical arm, and caressed the very base of the dildo where it was buried deep as ever in the rabbit's rear. Tobi's eyes bulged, and he squealed with shock, then laughter as a thick spurt of pre-cum almost orgasmic in its own right painted his innards, reacting to the mystery man's touch like it was far more than the caress of any one, mortal male.

"A tru-cock is meant to replicate life. To make it seem as though it has desires of its own, and to respond to those of its user. To feel alive in almost every sense, right down to its ability to cum dependant on how you stimulate it. But this... this prototype is something special, and I think it will require my own special care for that reason."

The dark furred figure murmured, though he paused, and smiled when he heard the bunny give a soft, sorrowful whimper.

"Of course, I am rather busy. Such is the case when you're... well, when you're upper management. Perhaps, if I were to entrust the well-being of this new life-form... this true tru-cock, with all its real desires for fulfilment, for companionship, and of course for pleasure far beyond the limits of what any researcher or mere test subject might expect, into the hands of someone who understands its needs. Who would respect, care for, and lavish upon it all that it craves. Perhaps if I did that, and simply checked in every now and then to ensure it was remaining well cared for, that would work too."

Tobi whimpered. The cock buried deep inside him throbbed and drooled new, liberal strings of glistening pre-cum. The jackal grinned.

"Well, it seems all parties are content."

He licked his lips, rose back to his feet, and padded over to where Tobi was still lying prone against the tilted mattress, still impaled deep upon the still rock hard tru-cock nestled adoringly in his ass. The jackal leaned against the sloped surface, and tilted his head forward, towards the rabbit's own wide, glassy eyes.

"I'll see you again, Tobi."

He murmured in a voice that once again seemed to carry the rabbit right to the precipice of orgasm.

"But, until then?"

The jackal blinked, and as the rabbit found himself compelled to do so too... he felt reality lurch, shift beneath him, and suddenly he was lying upon his own bed. Resting face down in his soft sheets, only to try and sit up, and groan in ecstasy as upon doing so he realised that the cock, now disconnected from its mechanical arm but still just as rock hard and still throbbing with a life of its own, was still buried deep and rock hard inside him.

"...until then..."

Anubis' words echoed around the bedroom, and the rabbit's eyes bulged. The cock throbbed uncontrollably inside of his ass, and Tobi squealed in mindless rapture as once again, without cause or warning, they both began to cum all over again as the god delivered his final message of good-will to them both.

"...happy humping."

By Jeeves

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