Thick steel walls muffled the booming sounds of the sleepless machine as Yundo climbed into its cubic black core. It felt like he was entering the heart of the gigantic structure, though this also meant that he was the deepest inside it he would ever be. In here, the slugcat hoped to find guidance or at least a hint to where he had to go to escape this place. To be honest, there was no reason that he would find anything helpful, but this location looked so special that his brain insisted it had to give him something, anything. And if this didn't help him, he feared that nothing else would. Then, he would be stuck on an eternal odyssey through the insides of this gigantic, uncaring machine.

Soon, Yundo spotted a mellow pink light at the end of the winding shaft. He was getting closer! The slugcat's heart hammered in his chest, and nervous anticipation dominated his mind as he wondered what dangers or treasures the heart of the machine might hold. Finally, he left the gloomy vent and popped his head into a sterile, cubic interior. All four walls were clad with white ceramic tiles, the edges lined with steel railings and pink tube lights. Swiveling his head around, Yundo scanned it for any immediate threats, but he luckily could detect none. Instead, there was only a single pink creature in the center of the room. It looked a lot like a slugcat, as it had two legs, two arms, a distinctly upright posture, and a face with two vast, blue eyes and two pointy, metallic ears, a softly blinking red dot adorning its forehead. However, instead of a tail, it was attached to the chamber's railing by a long hydraulic arm, connected to the machine with countless red wires. The creature used the arm to move around the room without having to worry about weightlessness. Fortunately, it hadn't noticed Yundo yet; its eyes were locked on a set of floating pearls. Those were the same kind he used to pay scavengers with, but he had never seen so many in one spot before and in so many colors. Weirder still, little glowing symbols floated above the shining orbs. They were morphing and changing while the robotic being manipulated them, flinging and swirling them around to form strange but mesmerizing patterns.

The longer Yundo watched, the uneasier he felt about the robot. He didn't want to interrupt it in whatever it was doing because he feared it might take revenge and do who knows what. However, he also didn't want to give up and return to the labyrinth because there appeared to be another vent just a few feet away from him. Right now, that exit felt like the only sensible way forward. Looking at the ceiling, he saw that the vents were connected with a pair of railings, giving him an idea. Maybe if he was careful, he could climb along the railings without the being noticing him. 

The male took a deep breath and put his thoughts into action. Clutching the bars of the railings, he carefully pulled himself out of his vent's safety and into the strange chamber. Paws and feet braced against the steel, he carefully shuffled forward, bit by bit. His heart was pounding, he was sweating with anxious tension, and he held his breath, afraid that the noise of his breath alone would alert the robot. This wasn't even an unfounded fear, for this room was eerily quiet. The industrial thumping that permeated most of the construction had faded to a whisper in the distance, and the only prevalent sounds were a faint electric hum and the occasional click when two of the floating pearls collided during their complicated dance. Every now and then, Yundo dared to peek at the pink robot underneath him to check whether it had spotted him, but fortunately, it was still engrossed in playing with its pearls and paid its visitor no attention at all.

However, the moment Yundo reached for the second vent, his paw mere inches away from the edge of freedom, a powerful voice echoed in his head, uttering incomprehensible noises. The slugcat froze on the spot, paralyzed with shock. He had been discovered! As he cautiously looked down at the robot, it stared back at him with glowing blue eyes. Otherwise, its face was uncannily featureless. It didn't have a nose, and its muzzle was only hinted with a shallow groove. The voice in his head returned, questioning him in an unknown language, and the slugcat knew that it must be coming from the robot. There was no one else around, so it had to be the source, right?

Yundo felt terrible while the being pelted him with questions and remarks. He had never intended to disturb it in its work; he just wanted to escape this place. In fact, he was so excruciatingly close to the exit, if he just latched on to the edge and pulled himself up into the vent, he would be gone in about a second. Bracing himself against the ceiling, he prepared to charge forward and leave. He leaped with all his force, but his paw missed its target by about an inch as a sudden force pulled him down. As if by magic, gravity had returned in full force and ripped the unsuspecting, unprepared slugcat from the ceiling. With a distressed squeak, he tumbled through the chamber before hitting the floor face-first. The force of the impact rang in his ears and knocked all the air from his lungs.

While the slugcat lay on the ground, collapsed into a chubby heap, unable to move, and gasping for breath, the robot approached him, and the alien voice in his head stopped speaking for a moment. Yundo sluggishly raised his head and looked into its vast eyes again, and a mighty shiver ran through his spine. There was something enchanting yet completely wrong about those mellowly glowing circles. Then, the voice returned, but this time, it talked in a language the slugcat understood, and it immediately didn't sound as hostile and foreign anymore. Instead, it was melodic, artificial, and somewhere between masculine and feminine in pitch. 'Greetings, little traveler,' it whispered. 'Now I get to meet the creature that bumbled its way through my circuits. By the way, I have what you are looking for.'

Yundo furrowed his brows while he stared at the pink robot with thousands of questions on his mind. What circuits was it talking about? How did it know what he was looking for? What was he actually looking for? What was this creature even?

'Oh, I'm sorry, I should've introduced myself properly, Yundo. I am Radiant Heat. And the circuits I was talking about? Well, the body you see hovering right in front of you is only a tiny part of me, the physical representation of myself. Everything else around us, the rooms and chambers you've gone through, are basically part of my brain. I'm a robot, if you want to call me that, but more accurately speaking, I'm a supercomputer or an iterator, how my creators liked to call me.'

The slugcat's eyes widened as the curious creature sang in his head, answering the questions he had only been thinking and addressing him with his name, although he had never said it out loud. There was only one inevitable conclusion: That robot could read his mind! It didn't even need to open his skull or something like that. For Radiant Heat, he was an open book, his secrets and motivations laid bare, which sent another cold shiver down his spine.

'But yes, just call me Radiant Heat once you find your ability to speak again, that is. Alternatively, we can simply continue to communicate through your mind, Yundo. It's much easier anyway, isn't it? And don't worry, your secrets are safe with me. After all, there is no one around I could share it with. You're my first visitor in centuries,' the robot revealed. 'Now, you aren't here to visit me on purpose, are you? You seem to have come from that hideous hive in my underbelly. Yeah, I'm sorry about that. I have no control over that failure.'

Yundo nodded shakily and gave Radiant Heat a hopeful look, mustering all his strength to plead, "Please... I-I just want to leave. I... want to be f-free again."

'I know, you want to return to Lash, your lizard. Don't worry, I will show you the way out in a bit. However, I won't let you go just yet. You've disrupted my calculations, done damage, and caused a perturbation in general. Also, I have to study you for my research because I just can't let this opportunity go to waste. It doesn't happen very often that I am blessed with an intelligent organic. But don't worry, the procedures won't hurt. No, they actually will be a lot of fun! And I promise that we're done in less than a day, '

The slugcat swallowed nervously, cowering away from the robot's inquisitive stare. The promise of freedom was oh-so-tempting, but he disliked everything that it mentioned afterward. He didn't trust Radiant Heat, and he definitely didn't want to be studied in any way. That sounded much too terrifying. Oh no, it was reading his thoughts right now, wasn't it? 

The ground below Yundo opened with a sharp hiss. Within a split second, several black mechanical tentacles lashed free and coiled around his heavy body and limbs. They had restrained him before he even had time to react. Harrowing memories welled up in the slugcat's mind, and he desperately tried to struggle free but to no avail. He was completely immobilized and could only howl pitifully.

Radiant Heat sauntered toward him, its hydraulic arm humming softly. It gently reached for Yundo's head and pressed its pink plastic face against his. 'Nothing I said was up for debate. Your consent is irrelevant, but I am sure that you will enjoy the examination. I don't want to have to restrain you, but I don't think there is a better way to do this. I just don't want my research target to squirm and struggle while I'm trying to do my important research. Also, please stop crying, or I will be forced to gag you, okay?'

Yundo's mood plummeted faster than a vulture struck by lighting. In retrospect, entering this room had been a terrible mistake, but there was nothing he could do about it. Or was there? Unlike the alien proto-organism that had abducted him before, this robot seemed intelligent enough to be reasoned with. In fact, it seemed more intelligent than all creatures he had ever met before combined. The slugcat gave it a shot. It couldn't get much worse anyway, right? "No, please! Tell me what you want to do! Maybe if I know what you want to do, we can do this differently? Please, no restraints! I... I just can't bear it," he begged. "Anything but this!"

The slugcat didn't actually expect his words to affect the robot, but Radiant Heat reacted immediately. It fell deadly silent and stared at him, pondering his plea. Much to his surprise, the tendrils released him mere seconds later, one by one, and put him back his legs. 'Very well. I've experienced a shocking amount of despair in you. I didn't expect this to affect you so greatly. I don't want to cause you that much distress; I want you to be happy. I'm sorry, Yundo,' it apologized. 'Now, you've offered to cooperate if I told you about the procedure, so I will do just that. I only need a few samples of you, both physical and mental. I need some of your ejaculate, and I need a sample of your lust.'

"A sample of my lust?"

'Yes. I need you to get aroused and have a climax for me several times. I want to research what that does to your brain. You know, my creators set it as my duty to find the perfect way to make everybody happy, and sex turned out to be the most effective way to achieve this goal. Therefore, I want everybody living around me and one day in the whole world to have as much sex as they can while I try to enhance the experience even further. But I can't enhance it if I don't know how it works. Ah, the explanation is calming your worries already.'

Yundo nodded uneasily. The robot's sudden change of heart sounded too good to be genuine, and it still crept him out that it could simply read his thoughts. "You just need me to cum for you? That's all? Why haven't you told me from the get-go?"

'Yes, if you put it that way, it seems like I could've handled this much better. Apologies, Yundo. It appears as if the millennia of solitude have impacted my social skills,' the robot snickered. 'Is this enough explanation? Are you ready to proceed?'

Radiant Heat's voice was brimming with impatience. It seemed eager to continue, and Yundo knew that it would get what it wanted, whether he cooperated or not. "I mean, I don't really have a choice, so sure. How do you want me to do this? Am I supposed to jerk off? I don't know if I'm even able to... Ummm, to get hard." The slugcat looked around himself and shivered. The unexpected tentacle assault had triggered a primal fear in him, as it reminded him too much of his ordeal in the machine's underbelly. Besides, he was sure that even more tentacles and contraptions slumbered beneath the floor and wall tiles, waiting their turn to violate him at a single of the robot's commands. He also noticed the ridiculous amount of pearls scattered all around him, a wealth that was larger than anything he had ever seen in his entire life. However, the slippery orbs also trapped him, as he would inevitably trip and fall over them. With his legs still shaking as his bloated body recovered from the shock and weightlessness, he could barely move anyway.

'You need help getting aroused? Let me think, and maybe we can figure something out.' Radiant Heat scratched its chin and looked around the chamber, idly kicking a pearl across the floor. Then it snapped its fingers, and the floor tiles opened up. Yundo's heart skipped a beat as he fully expected another onslaught from those wicked tendrils, but the robot just discarded all the pearls. 'Perhaps it helps if I lend you a paw?' it then offered, slowly strutting toward him. 

The slugcat eyed it warily as Radiant Heat came closer, reaching for his groin with its robotic paw. 'Don't worry, I won't use any of the manipulators again, or tentacles as you like to call them. Just relax and let me assist you. I am sure that this will work.'

Time slowed to a crawl as the robot's slender fingers neared his slit, and Yundo struggled to stand still because a voice in his brain commanded him to retreat, to flee this strange creature's embrace. But he mustn't listen! The slugcat squeezed his eyes shut, so the eerie surroundings wouldn't distract him, and he braced himself for whatever the robot would do to him. 

Finally, the robot's fingers connected. It was just a gentle touch, two fingertips pushing against the sensitive skin next to Yundo's vertical slit. A pressed gasp escaped his muzzle, and he tensed up in irrational fear. However, Radiant Heat didn't do much more than that, tenderly rubbing its fingers along the side of his slit. Its caress felt surprisingly warm and soft for a machine and its movements were delicate and fluid. Gradually, Yundo's apprehension broke up and dissolved into a pleasant warmth, a tentative burst of arousal welling up from his slit and engulfing his mind and body.

Ever so slowly, their heads moved closer together as Radiant Heat stroked Yundo's bulging slit until finally, their foreheads touched. The robot's other paw moved around the slugcat's waist, and it gently rubbed his back. A soft, soothing melody poured from its mask, a mixture of chimes and wooden flutes that echoed throughout the chamber and permeated Yundo's body, infusing his flesh and mind with ethereal, otherworldly happiness. This hug was likely the greatest affection this being could grant without having a proper mouth to kiss him with.

Another stroke of Radiant Heat's fingers was enough to part Yundo's pulsing slit and uncover his glistening opalescent taper. In one fluid motion, the artificial being wrapped its paw around his girth and slid it up to the tip, coaxing out the first drop of pre. 'The Abyss really has done a number on you, poor Yundo,' it whispered, softly inserting a single finger into his pliable urethra. A confusing shiver raced through the slugcat's body, and dark memories from the hive popped into his mind but the robot's calming caresses and mellow song managed to curb his panic, squash it so effectively that only a soft whimper escaped his throat. 

'Don't worry. The beasts won't disturb you any longer. I'll make sure of it,' Radiant Heat reassured Yundo as it curiously pushed its finger deeper into his dick, exploring his urethra in a way that should've never been possible.

Once the robot was satisfied with its inspection, it pulled out and gently jerked Yundo's swelling shaft, gliding its paw up and down and slathering it with pre. The slugcat's face melted with bliss as wave after wave of pleasure muddied his mind, soft moans escaping his lips and his hips bucking against the artificial paw. Every stroke was perfect, just the right speed and tightness, as if Radiant Heat couldn't only read his mind but also what stimulated him the most. His fear, his anxiety, and his reluctance were wiped away by pleasure. The pawjob even rivaled his experiences with all the butts he had ever tried, his carnal activities with Lash, the friendly scavengers, and his companions back home, and he quickly lost himself in the heavenly stimulation. 

Gradually, Yundo's mind blurred with pleasure. The chamber's tiles melted into a muddy white backdrop, and he forgot about the slithering terrors that lurked beneath. His head bobbed in a lust-addled trance as he tracked Radiant Heat's paw. It slid up and down his throbbing, leaking prick without pause and gently increasing vigor, the artificial pink fingers bending and curling ever so slightly to embrace him perfectly. The wet, lewd noises accompanying each stroke swelled and blended with the robot's song and the slugcat's randy moans to create an obscene symphony of lust.

Receiving the robot's endless affection, Yundo's pleasure continued to pile and mount, infusing his body with a sensation of warmth and tightness as he approached his first orgasm. He soon closed his eyes and wrapped his arms around the artificial being, hugging it tightly and pressing a kiss on its smooth, warm plastic mask while he was overwhelmed by lust. "Oh, this is so good!"

Radiant Heat never stopped or slowed its ministrations. It didn't comment on the kiss or talk in general, just humming along to its ethereal song as it drove the squirming, moaning slugcat over the edge. From one moment to the next, Yundo's arousal spiked, and the tension in his body unleashed in a powerful climax and a primal cry. His mind exploded with pure bliss while his dick erupted with a volley of cum, squirting a massive load of thick, gooey semen all over the robot's body.

Radiant Heat didn't seem to mind the lewd shower in the slightest. Its paw tightened around the slugcat's pulsing, pumping cock, and it worked him extra hard to drain every last drop from his internal nuts. Only after the flood abated and the strokes yielded little more than a dribble, it released the slugcat's taper and pulled away. Its entire artificial abdomen was drenched and dripping with semen, the bright pink dulled and muddied by the milky white coating. The voice in Yundo's head returned with a deep sigh, brimming with profound satisfaction. 'Thank you very much, Yundo, for sharing your orgasm with me. It might not appear that important or noteworthy to you, but you already gave me a lot of new insights.'

"Not noteworthy? This was wonderful! I'm glad that we've done it this way," Yundo moaned with a silly smile. "Much better than doing it with weird tentacles. Although, it looks like I've made quite a mess of you. I hope you don't mind. I don't know... I'm a lot more productive than I used to be, but I don't really know why." Granted, he had the sneaking suspicion that his enhanced productivity might be linked to his abduction by the Rot, but that couldn't actually be true, could it? Why should his involuntary stay in the hive have made him more productive?

'Oh, don't worry about the mess. I don't mind it. However, I would appreciate it if you blew the next load inside me. I still need to sample your semen, after all,' Radiant Heat chirped.

Yundo raised a brow and wondered what the robot meant by inside. It clearly didn't have a muzzle, and it didn't look to have any other accessible hole either. He was proven wrong the moment Radiant Heat lay down on its hydraulic arm and stretched its legs back over its head, presenting its surprisingly ample and round butt. Its crotch was featureless, a shining pink plate covering the part where any ordinary creature had a slit or a dick, but a little further down, the slugcat noticed a patch of smooth, black artificial skin with a tight, tensing hole in the center. For some reason, that robot had a butthole.

'Please, fuck my ass, Yundo,' Radiant Heat urged. 

Yundo hesitated a bit, still recovering from his orgasm, when suddenly, an intoxicating smell wafted around his muzzle, a mixture of musky odors strangely reminiscent of both Lash's scent and the scent of a slugcat in heat. He suspected that the robot had concocted this scent on purpose to get him back in the mood because there was no other possible source of it around him, and it worked wonders, reigniting his lust in an instant and swelling his shaft back to full mast.

Emboldened by the smell and sight of the slutty robot, Yundo stumbled closer and grabbed its smooth pink thighs, spreading its legs apart even further. His arousal grew worse with every second he breathed that addictive cocktail, and the urge to stick his taper into the quivering artificial hole became unbearable. With unbridled lust burning in his big black eyes, he aligned his dick with Radiant Heat's anus and shoved it in with no consideration or hesitation, shafting the whole thing with a single thrust. A lusty howl poured from his throat as the robot's snug artificial insides wrapped around his shaft. The first glance hadn't deceived him. Its butt was just as tight, soft, and warm as it looked.

Bending over Radiant Heat, Yundo began to pound its otherworldly ass with hefty thrusts and little mercy, desperately trying to satisfy his surging arousal. As with the pawjob before, the robot's rear offered an almost perfect experience, its inner walls undulating and rubbing against his cock in perfect sync to his thrusts. Waves of pleasure seized him that were mightier than anything he had ever experienced, turning this into the most pleasurable sex he had ever had. Louder and lustier cries of passion blurted from his muzzle as his poor mind turned to silly mush. The only way this could've been even better was if a second version of the robot had taken him from behind.

Surprisingly, Radiant Heat enjoyed the penetration with similar pleasure, adding its own screams of radiant bliss to the mix. Its hot voice echoed through the slugcat's mind, inescapable and all-encompassing, gripping him to the bone and multiplying his lust. For the first time, its artificial eyes were shut, forming two thin semi-circles on the featureless mask as it lost itself in the ceaseless pounding.

Yundo bent even further over his curious partner, wrapping his paws around it and hugging it tightly while he mounted its tight, flawless ass with all the force he could muster, going absolutely feral on it. His muzzle brushed over Radiant Heat's mask, and he pressed a stormy kiss on the featureless but warm plastic. He couldn't stop himself even if he wanted to, wholly absorbed and dominated by his own lust, reduced to nothing more than a mindless machine. The lusty vortex in his head turned and twisted faster and faster, accelerating as it carried him to the sky and above, ever closer to another orgasm.

Despite the intense onslaught of stimulation, the slugcat lasted longer than usual, spending at least ten minutes in a heated rutting frenzy, sweating and grunting without pause. Still, his energy didn't fade, and he fucked the robot harder and faster with every second while his brain lost track of time and space. Before too long, he noticed the first signs of an imminent orgasm, a rising tightness in his chest and crotch, a tingling rushing through his body, into his limbs, to the tips of his tail and ears, before the whole tension snapped in a single heartbeat.

Yundo burst with a needy cry and hammered his dick into the robot's avatar with enough force to make its hydraulic suspension tremble. A wave of celestial bliss emerged from his loins, washed through his body, and engulfed him wholly, consuming the receptive slugcat with a wave of sweltering heat incomparable to any orgasm he had ever had and likely would ever have. Perfectly synchronized to his climax, Radiant Heat experienced a similar high, its pucker tightening and clenching as he erupted inside its ass. The robot's ecstatic voice in his mind became even more intense, driving and supercharging his orgasm to infinity. Yundo blacked out as he drowned in stimulation and sensations, everything merging and mixing together so that nothing made sense anymore.

A small eternity passed before the extraordinary climax loosened its grip around Yundo's poor, little mind and allowed him to calm down and recover. Slowly, the slugcat's senses returned, his hearing and vision cleared, his taste and smell returned, and the numb tingling everywhere faded as he started to feel his fingers again. He gradually regained control over his legs and arms, his hips and tail, and finally began to register what was going on again. Radiant Heat hadn't moved ever since the first penetration, its eyes closed, and its voice ebbed to a lewd singsong, but its body had changed. The slugcat's increased productivity had left a visible mark on the robot's frame. Its midriff cover was distended and rounded from his voluminous load, creaking and sloshing as it struggled to contain the lewd blessing, and it was still swelling larger as his dick kept pumping more semen into the avatar.

After a few more spurts, Yundo's climax finally came to a close, and his internal testes ran dry, leaving him in a state of profound bliss and satisfaction. He had never come that hard and much. With a soft sigh, he pulled out of the robot and stepped back, waiting for it to react. Radiant Heat took its sweet time, though, resting for another minute before its servos whirred back to life and it rose from its slumber.

'I cannot thank you enough for this, Yundo. You helped me in more ways than just one,' the pink robot lilted laboriously and rubbed its swollen tummy. 'This sample is more than enough for my experiments and should last me quite a while. This will make the lives of the creatures in my domain much easier and more fun. Also, I've taken the liberty to analyze your semen. It appears as if the Abyss hasn't been able to corrupt and repurpose you. In fact, it only enhanced your breeding capabilities, made you more potent and productive. Your resistance to its attempts is highly fascinating, and I would love to carry out some research on it, but I promised to let you go, and I won't break a promise.'

Yundo nodded with a rapt smile. He was glad to learn that the nightmare in the machine's underbelly hadn't left any permanent damage and even enhanced his body on accident. "So you'll show me the path to freedom now?"

Radiant Heat raised a finger and shook its head. 'There is one more thing I have for you. A gift for your cooperation.' Then it turned around, lifted off a tile, and rummaged through the substructure.

The slugcat had mixed feelings about the robot's interjection. He really wanted to see the light of day again, sick of being stuck in Radiant Heat's home, but he was also curious about the gift. What could an entity as old and strange as it possibly have to offer? With his paws pressed together and his head cocked, he waited for the robot to reveal whatever gift it had for him.

'Cooperation is power, and communication is key to cooperation. I cannot gift you my telepathic abilities in their entirety, little slugcat, as they are merely a consequence of my sheer size, but I can give you a tool that grants you a temporary neural link with another sentient creature,' Radiant Heat explained, holding a big pink tube and one of the flying orbs that inhabited large swaths of its home. Showing him the orb, it continued, 'This neuron contains the necessary data to link your mind with another being. However, it requires energy to function. While it could feed on your life force or karma, it could easily drain you within a few cycles. Instead, this feeds on orgasmic energy. It is charged whenever you and your partner experience a climax, and it then automatically links you to them for a day or so. That way, you'll hopefully be able to talk to those who are closest to you.'

Yundo blankly stared at the robot as his brain tried to make sense of its words. Slowly, he understood what it just told him, understood what the little orb did, and his confusion turned to blissful excitement. "Wait, does this mean that I can talk to every creature I have sex with? Even Lash?"

Radiant Heat responded with melodic laughter and nodded vigorously. 'Especially Lash. I felt your strong connection to the pink lizard and your struggles to converse with him. This will allow you to talk to him just like you talk to me.'

The slugcat's heart beat higher and faster as he imagined all the new possibilities this opened up. Not only would he finally be able to hear his beloved companion's voice and thoughts, but telepathy also offered a significant tactical advantage on their hunts. "This sounds too good to be true! Are you sure this works?"

'I actually don't know if it works because I never had the opportunity to test it on anyone but myself. It's mostly a pet project of mine, but I have spent centuries perfecting it. I'm confident that it works.'

Not quite the answer Yundo hoped to hear, but if there was one being to make it work, it was probably the hyper-intelligent creature that lived in a gigantic superstructure, right? "So, how do I apply this... neuron? By swallowing it?"

Without a further word, the robot opened the pink tube and shoved the neuron inside it. Then he popped off his crotch cover and mounted the device on a notch. Hissing softly, the supposedly rigid rod softened and swelled, a slit on its rounded tip opening. Now, it looked much more like an artificial scavenger dick, and Yundo got a sneaking suspicion of what Radiant Heat was up to.

'Unfortunately, your stomach is too efficient and would break the neuron before it could settle inside you. You have eaten quite a few, so you should know, shouldn't you?' the robot chirped. 'No, instead, I need you to bend over so I can inject it from behind. I hope you don't mind.'

Yundo was more than fine with its plans. Getting it up the butt was a negligible price to pay for the gift of telepathic communication, if he could even call it a price. As far as it mattered, this only added some extra fun to the process. So, he turned around in a heartbeat and bent over, flinging his massive tail over his shoulder and exposing his pucker to Radiant Heat. "Oh, I can't wait!"

The robot's servos and hydraulics whirred and hissed as it rushed toward the slugcat and stopped just shy of his rear. Leaning closer, Radiant Heat reached around Yundo's chubby chest and pulled him back up while it shoved its artificial appendage through his thighs, showing off the dimensions of the massive tool. The neuron was already as big as the slugcat's fist, so consequently, the injector had to be even bigger, and it easily outclassed most cocks he had seen so far. As the robot rubbed it back and forth, Yundo was surprised by its warmth and flexibility. It felt and looked real, even leaking clear, sticky fluid from the loose tip. 'You are ready, aren't you?'

Yundo nodded eagerly whereupon the robot pulled back and prodded the tip against his flexible anus, pushing and shoving with numerous shallow thrusts to break into his ring and shove the oversized toy into him. The slugcat relaxed the best he could, and finally, it went in with a lewd slurp, plugging his rear with its gigantic girth. 

Radiant Heat immediately tightened its embrace and hooked its legs around the slugcat's thighs. Multiplying its strength with its hydraulic arm, the robot wielded its artificial pecker like a jackhammer to stretch Yundo's guts and drive it deeper and deeper, eager to deliver the payload as deep as possible.

Yundo's pliable insides were no match for the reinforced cock, and it bottomed out within mere seconds, distending his belly with a massive pink bulge. An intense spike of stimulation overwhelmed his brain as the humongous rod continued to rub and bulge his sensitive insides, and he yielded with a resounding howl, his entire body falling limp as his lust took over. 

Radiant Heat, however, kept him in a tight grip and never let him go. With their limbs intertwined, the robot slowly lifted him up into the center of its chamber, put him entirely at its mercy. Once in position, it ramped up the speed of its affection even more. Its cock didn't move that far with every thrust, merely half an inch at best, but it stirred Yundo's insides at an unprecedented pace, stimulating his flesh with the full force of its hydraulics. The slugcat howled and cried with senseless pleasure, his body shaking and jiggling like jelly, his opalescent taper bouncing and swinging wildly, as he received the savage pounding. The robot happily joined his exclamations, drowning him with an overbearing serenade of lusty moans and passionate screams.

Gradually, the last bits of sanity escaped the slugcat, and he turned into little more than a lusty, clamoring vessel waiting to be filled with the robot's gift and whatever else it had in store for him. He could no longer move; he could only take the pounding and feel his lust surge and mount, pushing him ever closer to his final orgasm.

An unexpected cold touch on his lips snapped Yundo out of his lusty daze. Radiant Heat was pushing a silvery pearl against his muzzle, trying to shove it down his throat. He gagged in surprise as the slippery orb slid down his esophagus, and before he knew it, the robot force-fed him another one and kept going until he was thoroughly stuffed. The slugcat couldn't even comment on the unexpected boon, too weak and absorbed by the pounding.

'A proper payment for your cooperation and for letting me fuck your tight ass. I've got millions, so they barely mean anything to me anyway,' Radiant Heat snickered and held up another pearl. However, this time, it didn't feed it to him but pressed it against the loose, leaky tip of his throbbing taper. Yundo's eyes widened, and his next cry was warped with confusion as the robot insistently shoved the pearl down his urethra, dead-set on stuffing it into his bladder.

However, Radiant Heat didn't get very far with the insertion. Only halfway down Yundo's cock, the strange stimulation from the smooth, cool surface stretching and rubbing the insides of his urethra gave him the kick he needed to experience another orgasm. His body reared up, and he came violently, churning up a fat load that was immediately blocked by the shiny orb inside his taper. The slugcat yowled and whimpered furiously, thrashing around as the pressure built up further and further, overloading his poor brain until his stubborn partner finally pulled away and cleared the way. From one moment to the next, the pearl shot out of his dick with a big rope of cum, hurtling through the entire chamber until it impacted the opposing wall with a resounding ping.

Now that the floodgates were unblocked, Yundo blasted his semen all over the place, immersing the tiles in a finger-deep puddle of thick, milky goo. His dick bounced and flailed around, still driven by the robot's persistent thrusts until Radiant Heat joined his climax with another deafening cry of pleasure. The mechanical pounding stopped in an instant, and the slugcat was given but a brief moment to catch his breath and relish his blissful orgasm before the robot came inside him. He quickly learned that even his enhanced climax was nothing compared to the torrent the artificial being unleashed. It flooded him with a warm, pitch-black liquid, turning his milky white tummy dark gray as the hot mess rushed and gurgled through his insides.

The rising pressure in his growing tummy snapped Yundo out of his orgasmic daze, and his mind cleared. A grunt escaped him as he noticed his almost spherical, sloshing belly, but there was nothing he could do about it, still restrained by Radiant Heat, dangling in the air, and with about a foot of dick inside him. "What did you do? Was that really necessary? I'm so full!" he groaned weakly.

The robot gave him a deep, drawn-out sigh, slowly pulled out of him, and set him back down on the floor, right into his own cum puddle. 'I'm sorry, I just couldn't hold back. Not after eons of total abstinence. The creators were right. Slugcats are perfect cum-dumps.'

"Umm, but this isn't cum, is it? It's black. Also, what about the neuron?"

Radiant Heat fumbled around with its cock and dismounted it, showing him the empty chamber at the bottom. 'The neuron is now inside you and ready to begin its work. And yes, my cum is black because it's just cooling fluid. But don't worry, it's perfectly safe.'

"Also, why should you have cum? Can you reproduce?"

'Oh, no, I can't. Blame my creators for this perversion and all the other things they did to me,' Radiant Heat sighed and stepped next to Yundo, holding out a paw. 'But don't let that trouble you. They are all long gone and irrelevant, their heritage broken and dilapidated, mostly rendered useless. Even I have become almost completely useless, strayed far from my original purpose, but that's alright. The only thing that counts for you is that you get back to your beloved lizard as soon as possible.'

The mention of Lash made Yundo's heart beat higher. Now, he had one more reason to return as quickly as he could, and Radiant Heat was right, he shouldn't lose any more time. "About that, how do I exit this construction?"

With the snap of a finger, the weightlessness returned, and the bloated slugcat began to hover above the ground. Surprised by the abrupt change, Yundo reflexively grabbed the robot's paw and firmly held on to it, only for it to slowly carry him through the chamber and up to the two exits. 'If you take this vent, you should end up atop the roof of the facility. From there, turn north and keep going until you reach the edge, climb down to the foot of the tower and traverse the Eternal Twilight underneath,' Radiant Heat explained with a tinge of sadness in its androgynous voice.

Yundo froze as he realized where he really was at the moment, his disorientation clearing and his mind exploding from the casual revelation. He had been inside the Ebony Tower the entire time, had traversed its bowels and brain. A mighty sense of satisfaction coursed through him as his curiosity had finally been quenched. Now, he had seen what this gigantic spire was all about, had met its inhabitants, and experienced it in all its glory, more than he ever hoped or wanted, and yet, he still didn't understand any of it. The mystery surrounding this and the other megastructures had only gotten more puzzling to his small, little slugcat brain, but now, his desire to visit them had dropped to zero, and he only wanted to get off and away from it as fast as he could.

Committing the robot's instruction to memory, the slugcat grabbed the railings and slipped tail-first into the vent. But before he left, he looked up and right at the robot, feeling a little guilty about leaving it behind so soon -- after all, Radiant Heat had made him a truly invaluable gift -- but he mustn't leave Lash hanging. "Thank you so much for that neuron-thingy, Radiant Heat, and thank you for showing me the exit from this maze. Without your help, I'd be stuck here for all eternity."

'And I thank you for your generous donation. I hope that it'll help me conceive of ways to enhance the life of the creatures living all around me and the tower even further, end the needless death and violence, and perhaps find a remedy for the horrors spawned by the Abyss. I'm eternally grateful, literally, and will never forget you, Yundo. Besides, part of me will always stay with you,' Radiant Heat whispered and waved at him. 'Farewell. May you find your true purpose and a happy end to your endless cycle.'

"Goodbye!" Yundo returned the wave before he vanished into the vent, sluggishly climbing down as fast as his encumbered body let him. The black steel and gray concrete had him back, he was all on his own again, but at least he was on his way out of the labyrinth, finally felt like he was making progress again.

As he continued through the narrow tunnels and vents, the slugcat soon noticed a force on his body, an ever-so-weak tug that pulled him into one direction, that pulled him down. Gravity was finally returning as he left the machine! It gave him proper guidance and brightened his mood, even though it dragged his heavy body down and slowed his movements. Following Radiant Heat's advice, he went up and up, crawling and climbing until he spotted a sparkle in the distance, a bright spot, possibly reflected sunlight. That alone gave his mood an even bigger boost. He moved with emboldened determination, hurrying closer to this promise of freedom until he finally emerged from the dusky ventilation system and popped into a spacious, light-flooded interior. It was so bright, he had to close his eyes to a tiny squint for a minute before they adjusted to the light.

Once he had regained his vision, Yundo found himself inside a strange room with a lavishly tiled floor, huge, colorful murals on the walls, and tall windows. Looking outside, he was greeted by an endless sea of cream and pale-blue buildings, tall and short, studded with countless windows, and scattered about to form a monumental city. Judging by the inch of dust covering the floor, no living being had entered this place in ages. However, the room's original purpose or the fate of the city's occupants didn't matter to him. It only mattered that there was a way out, a way forward, a way back to Lash. A mighty wave of relief coursed through him, washing away his doubts, worries, and tension and putting him into a state of utter ecstasy. Yundo cried, laughed, and yelled his joy at the crumbling walls, twisted and danced around, wildly flinging his arms and tail and stirring up a dense cloud of dust.

He was finally free!