The food in Robotropolis was dense, processed shlock. Greasy and carb-heavy, every bite felt like swallowing stones. That's not to say it wasn't satisfying; Carthis had always preferred calorie-rich foods, having a particular fondness for proteins like meats and cheeses, but eating it constantly had its consequences. No one, no matter how used to it they were, could eat this stuff forever and be completely fine.
His black dress shirt was strained at the lower section of his stomach, the buttons pulled tight over the swell of his packed guts. He sighed heavily, resting one hand on the console in front of him while the other mindlessly rubbed his bloated stomach. His tight pants cut into him, and the feeling of fullness was weighing him down significantly. It was a pain; he was supposed to be monitoring for those feisty little mobians, the ones who kept making a fool of the already-rather-amusing Dr. Robotnik. If one were to ask him, he'd say Robotnik didn't need any help with that task. Unfortunately, no one asked, and Robotnik certainly wouldn't have wanted to hear it if they did.
Metal digits tapped mindlessly on the console as he closed his eyes, feeling the weight of his guts pull him down. He'd been sitting before, but his clothes made it too uncomfortable; they pressed hard into his stomach, cutting a visible indent in his belly now even when standing. Nothing had moved for days now, and his greedy nature kept him coming back for more and more factory-produced garbage. Cheese burgers and pies and meatloafs, subs and box pasta and whipped cream-topped pastries...
"Urg..." Carthis winced, feeling his stomach bubble under his hand. He wasn't paying attention to the screens anymore. Maybe he'd have better luck with his stomach after a nap? He felt tired enough for one, that was for sure. Sleep did aid digestion, didn't it?
His guts groaned ominously, prompting him to glance down. A full week and only now getting some movement? He'd barely even been able to fart the last three days, so he supposed that wasn't helping. He shifted his stance somewhat, widening it, in an attempt to relieve some of the pressure. No luck; just more growling.
"What are you huffing and puffing about?" came a booming voice from behind, jolting Carthis into standing up straight. He wipped around, locking his hands behind his back and straightening his shoulders as the usually-menacing Dr. Robotnik stomped into the security room.
"What, sir?" Carthis asked, sweating.
"You were leaned over that control panel like you'd just run a marathon," Robotnik grunted, shoving the smaller man aside and waltzing up to the security screens. Carthis stumbled, but caught himself quickly.
"Was I? Sorry..." Robotnik didn't look like he was in a good mood, which, all things considered, was quite normal. His growling drowned out the noise from Carthis' stomach, at least.
"Anything? Anything at all?" Robotnik's mechanical eyes were focused on the center screen before turning back towards his on-again-of-again lackey.
"Nothing," Carthis confirmed, though he hadn't been watching for the last... hour or so? He'd been more focused on his stomach issues than searching for Freedom Fighters. This wasn't his usual job anyways; most of the time he flitted in and out of Robotropolis as he pleased, providing the occasional bout of support for the man who had "cured" many of his ailments with a partial roboticization. Not that Robotnik had intended for it. As a matter of fact, Carthis had done it himself, but he still found himself grateful for the technology and resources Robotnik's regime provided.
He also had a crush on the oversized lug.
Carthis wasn't shy about it, either. He flirted pretty openly with Robotnik, he thought, but he wasn't certain that the tyrannical tub of lard had ever noticed. Even hanging off his arm usually just got him tossed aside by one of Robotnik's tantrums. Maybe he was straight? That didn't seem likely. Carthis had seen how Robotnik looked at anyone with power. Sure, he saw other men in power as a threat, but he absolutely ogled the more effeminate-looking figures of power.
He didn't think he looked very manly. Carthis bound down his chest, had prominent hips, and long, dark hair. His voice, altered by the roboticizer, did sound a bit more androgynous now, but he was still easily mistaken for a woman. It happened often enough; he didn't really care too much. What was important was being able to crush anyone he wanted to, at any time, with his robotic augmentations. That was his gender; a "fuck up the annoying people, do whatever I want," kind of gender.
"...so we'd have to... are you listening?!"
Whoops, Robotnik had been talking. He usually tuned him out anyway, so it probably wasn't too important.
"Yes, your density," he quipped, wondering why Robotnik tolerated all the weird nicknames his bots gave him.
"Hmph," the overlander turned back to the screens, furrowing his brow. The fingers of his non-robotic hand tugged mindlessly at his mustache, belaying himself as if in deep thought. "I'd have thought they'd come through by now, after laying that rations-trap."
"Rations-trap, sir?"
"Ah-HAH! You WEREN'T listening!" oh, whoops! "The rations-trap! I laid out a collection of rations with the claim that it was from 'a friend who supported the good fight!' Bah! They took them, but I haven't heard from them since. You don't think it's killed them, do you? I'd much rather add that Sonic to my trophy room as a roboticized slave."
Carthis tried to think back on the week's events. It was always the same thing with Robotnik and the Freedom Fighters: lay a trap, get the trap triggered, almost manage to look as if he'd win, then get humiliated by Sonic or Sally. They must have been in the "almost managed to look as if he'd win" phase, then.
"What was to happen when Sonic took the rations?" Carthis asked, shifting his hips uncomfortably as his voice blotted out a particularly loud gurgling from his stomach.
"They were poisoned, of course!" Robotnik answered proudly.
"Poisoned? But not enough to kill them?"
"No, no, most certainly not. I wanted to force them out to seek medicine. Unless all of them ate the rations at once, I suppose. Then they'd probably be out of commission all at the same time... I hadn't thought of that. Wouldn't they take turns? So that they could attack Robotropolis at different times, or take shifts in defending Knothole?"
"I think you've overestimated their military capabilities, sir," Carthis muttered under his breath. Those Freedom Fighters were all just teenagers, right? One of them was the son of the head of the former royal guard, but that didn't mean much. The oldest one was still probably seven or so years younger than himself. And Robotnik was twice his age... Despite that, Robotnik seemed to simultaneously over and underestimate the Freedom Fighters all in one go. Maybe Robotnik's coup succeeding was a fluke, at least, in this universe.
"They've done so much damage to my factories, I should think they'd do the bare minimum of military defense!" Robotnik bellowed, slamming his mechanical fist down onto the console. The resulting CLANG shook the room, staggering Carthis and almost knocking him off his feet. Robotnik was massive, anyone who tried to claim he wasn't a heavy-weight powerhouse was out of their minds. For Mobius' sake, had no one seen that hammer he dragged around?
He didn't manage to catch himself, landing hard on his ass. His metal leg clanged against the similarly metal floor, disorienting him. Dazed, Carthis brought his hand up to his head, trying to make the ringing stop. He didn't notice how badly the movement had upset his stomach; it burbled low and angrily before letting out a terrible groan that signified a great deal of internal shifting. His hand went from his head to his stomach, a muffled moan escaping him before he gritted his teeth to cut it off.
It was another few seconds before he returned to himself proper, feeling that the room had become disturbingly silent. Glancing up, Carthis saw Robotnik looking down at him with a mix of emotions he couldn't quite read. Confusion for sure, but otherwise, he didn't know.
"Ah... sorry, sir," Carthis muttered, wincing as he felt his guts contract. Huffing, he shifted to stand up, feeling pressure mount deep within his stomach. It hurt, and he took a moment longer to stand up because of it.
Robotnik was still looking at him with that... sort of perplexed stare. The fact that he hadn't said anything deeply worried Carthis. He could take a beating if that's what Robotnik wanted to dish out, but he wasn't sure he could manage one right now. In fact, he could barely manage to stand up straight, feeling his intestines getting kicked into overdrive by the quick movement from before. He could feel his body clenching, his lower belly twitching visibly as he felt the ripple of another contraction move through his guts. His face started to heat up and he quickly waved his hand, dismissing the awkward situation as best as he could.
"W-well, if you have no need of me," he took a step backwards, trying to put some distance between him and Robotnik. Now he saw annoyance flash over the man's face, and he felt that he ought to get out of there while all of him was still in one piece. Carthis turned on his heel and bolted out the door and vanished around the corner of the hall in a random direction. Any direction that wasn't towards Robotnik.
He finally came to a stop at one of the storage rooms, squeezing into the broken mechanical door with some difficulty. If his metal arm and leg weren't bad enough, his stomach sure was. Pressing his stomach between the frame and door made him groan, pressure building in his colon and pushing out towards his ass.
Inside the rather small (for Robotropolis, anyway) storage room, Carthis leaned up against some of the boxes labeled "SCRAPPED BADNIKS." His hands immediately went to his stomach, trying to sooth the now growling mess that was his guts. His belly cramped and he doubled over, unable to prevent a harsh blast of gas from escaping his backside. It echoed loudly in the metal room, much to his chagrin, and lasted for five or so seconds.
"Ugh, now you want to start moving?" he hissed down at himself, frustrated. Carthis tentatively half-sat on one of the lower boxes, his ass mostly on top of it but his middle remaining relatively unbent for now. If he sat down he'd have to undo his pants, and there were a whole slew of reasons he didn't want to do that right now.
Carthis grunted, feeling his stomach bubble only a few seconds before another loud fart ripped from his cheeks. He blushed furiously, angry at himself and his body for the most basic functions. It also felt good; the relief of pressure gave him another reason to turn red, as he shifted to spread his ass open more so that he could let out a volley of short, hot farts that made his legs shake. He couldn't stop; some seal had been broken and now he was spewing as much toxic gas as the Robotropolis factory smokestacks.
He brought his hand up to his face, covering his nose and mouth as he clenched down, forcing out another eight-second burst of flatus. His gritted teeth stifled a moan that threatened to escape him, and his hand quickly dropped down to start rubbing his stomach.
Fuck... he felt hot, and not just because he'd trapped himself in this room with nothing but his own, vile ass to keep him company.
It wasn't a fetish he talked about, but it might've been one of the reasons he didn't bother to seek out healthier options. Robotropolis food backed him up for days, but the shit he'd take after was so utterly mind-blowing that he'd cum just from the contractions alone. It was fucked up and gross and he couldn't bring himself to care, especially when his present company was particularly foul themselves. Robotnik wasn't really shy about anything, after all. Not that he was too vulgar, either... he had a sense of decency, even if it was pretty warped. But he didn't eat with any grace, nor did he seem to mind when he'd sweat like a pig after working on his robots for hours on end.
Robotnik was gross. So was Carthis. He thought that kept things pretty simple.
Brrrbbbgl
Carthis sat up straight, leaning back and gently resting his hand on his stomach. The buttons looked more strained than before, but he couldn't imagine why. It must have been the angle; there was definitely less in him now than there had been before, at least, gas-wise.
"Smart move, coming to a glorified supply closet..." he muttered to himself, glancing at the door. It was one of those automatic sliding ones, and it had been broken since he got there earlier that week. There wasn't anything important in here, so it must not have been high on the repair-bots to-do lists.
It allowed for a crack just big enough for Carthis to squeeze through, and a view into the hallway. He could hear the marching of security SWATbots pass by down the hall, as well as the usual metallic droning one could always hear when in Robotropolis. The factories clanged and bashed all their own, but they were far enough away that it was background noise to him.
The noise in the foreground was more offensive, he thought.
brrrrrrrrrrrrrrrrt
Carthis blushed, grumbling to himself. This was stupid. As soon as he could reign in his ass, he'd head to the bathroom in his quarters. He quite liked that about Robotnik; he seemed aware that Carthis would come back often enough to warrant his own room. It was bare-bones but it was more than any other living thing in Robotropolis got, save for Robotnik himself.
Thoughtfully, Carthis glanced back down at his stomach, listening to it rumble in discontent. His... expulsions... were starting to slow down, meaning the relief they allotted him was lessened significantly. He felt bloated and uncomfortable, his stomach cramping at semi-consistent intervals. Maybe if he just...
Carthis gently pressed down on his belly, wincing immediately. A low, silent hiss of gas left him, heating up his ass significantly. It felt uncomfortably hot, causing him to shift his hips in an attempt to get comfortable again. His thighs- one metal and thus much more uncomfortable than the other- pressed hard into each other. The feeling of fullness and the relief of pressure being released had his hips twitching for another reason. He could feel his boxer-briefs become slick at the crotch, and, thankfully, nowhere else.
"Ugh... okay, let's just... do this slowly..." he muttered to himself, moving his ass back onto the box a bit. With both hands he braced himself against it, slowly raising himself onto it and into a sitting position. Immediately he could feel his pants cut into his stomach, his arms wrapping around his middle as he leaned forward and-
PPPHHHHHHHRRRRRRRRPPPPPPPPPPPPPSHSHTTFF
"Yipe!" he jolted upright, clenching himself shut as hard as he could as he felt the last ten-second fart begin to sputter dangerously at the end. The room stank of sewage now, and he couldn't quite keep his ass completely closed, little worrying-sounding farts bubbling and hissing out of him in quick succession. He squirmed where he sat, pushing himself down hard into the metal box and screwing his eyes shut.
There was a creaking noise that, at first, Carthis paid no mind to. Robotropolis made all sorts of weird noises. Besides, he was too busy with his own problems to worry about some wayward badnik getting scrapped, or whatever construction was being done. He bit down on his bottom lip, focusing on keeping his body in check when he felt something very heavy press into his stomach.
"H-haaa!" he jolted, his back hitting something metallic as he tried to shift away from whatever was pressing on his belly. Whatever it was grabbed him by the back of the head, keeping him staring forward in shock. He could feel hot steam on his neck, making it feel wet. Or, well... it was wet, rather, as something hot and greasy slid along the length of it and up to his jaw.
Carthis shuddered, his need for the toilet momentarily forgotten. A hand groped his stomach, making his body twitch in a weak attempt to get away. Another bout of flatus left him, this one broken up as it was being forced out of his guts. His face must have been beat red by now, and he could feel tears prick at the corner of his non-mechanical eye.
"H-huh?" he couldn't move his head, but if he looked down, he could see a thick, gloved hand kneading his stomach as one might knead bread. The feeling of it made him stammer out something akin to a moan, his hips twitching as he watched the invasive appendage snake around his middle and pull him against something massive, warm, and plush. "S-s-sir?"
"Shut up," Robotnik growled into his ear, his mustache tickling his cheek.
Carthis didn't know what to do. He was getting the attention he wanted from Robotnik, but it had happened so quickly and so unexpectedly that he wasn't sure how to react. Plus, he had to keep a great deal of his mental processes dedicated to not shitting himself, no matter how badly his body wanted to void itself of its load, or how completely Robotnik's hand was mashing his insides with its rough ministrations.
"Nng," his mechanical eye started to flash, changing from its normal red iris to a sort of pixelated firework. Carthis feared he was going to short circuit if this kept up, but Robotnik seemed keenly aware of that.
"You've done this more than once, haven't you? You come into my city, greedily eat up all of my food, then get off to it when I'm not looking. I had my suspicions the first time, but I thought I was just being perverse. But each subsequent time, you gorged yourself fatter until there was no way for me to miss your shirt straining over your stomach..."
His voice was low and husky, filled with vile desire and entitlement.
"But no, see?" he squeezed Carthis' middle, eliciting a squeak from the smaller man, "I was right. You were doing it. On purpose. I can't begin to describe how revolting that is."
"Hnng... nng... but you..." Carthis muttered, "...are here... aren't you?"
"I suppose I know my way around a toxic waste dump," Robotnik chuffed, making Carthis glance away in embarrassment.
"S-so..." Carthis didn't know what to say, or what Robotnik wanted him to do. All he knew was that there was a lot less gas in his stomach now that the overlander had manhandled it out of him, and a lot more of everything else.
"You had to pick the worst spot, didn't you? I'm not dragging you all the way to my chair," Robotnik scolded, making Carthis wince. "Stand up. We'll do this the hard way."
"The-hard-way?" Carthis asked, dazed as Robotnik began moving him around as if he was weightless. He was flipped around, his head and torso dropped onto the box he'd been sitting on and his ass pulled up against Robotnik's plush form. Well, plush, relatively speaking; he could now most definitely feel something hard against his ass, and it wasn't any of his robotics.
Robotnik's hand was back on his stomach in an instant, the other pressing him down at the shoulder. Notably, Robotnik was keeping Carthis' metal arm caged under his own. That was smart, he figured; no retaliation from his flesh-and-blood body parts could possibly hurt the mountain of a man that was Robotnik. His mechanical leg was knocked off balance, too, but that had more to do with how wide his superior had forced his legs. So wide that there was no way he could successfully clinch himself shut.
BRRRRRRRRRRRRRRRRRPPPPHHHHHHHHHHHHHHTTTTTTTTTTTTTT!
Carthis shuddered, his stomach clenching and forcing out more gas in this new, better position. He felt more and more bubble to the surface, vibrating against the thin, flexible material of Robotnik's body suit. He couldn't tell, but he imagined a wet spot forming on its crotch, his sparking optic flickering into a pixelated heart.
"You like to be tossed around? Or just crushed? "
At this, Robotnik leaned forward, pressing his weight down onto Carthis. The smaller man wheezed, his cunt shuddering as a white-hot BLORCH was forced out of his guts. He could feel Robotnik rutting against his ass, apparently unconcerned with potentially dirtying them both.
"R-Ro-bot-nik!" Carthis stammered, shivering as if he'd been tossed into the tundra, knock-kneed and disoriented, "i-if you k-keep-!"
The weight lifted, but so did Robotnik's metal arm. Carthis tried to prop himself up on his, but felt his pants yanked down before he could get his bearings. All Robotnik had to do was tug open the button to the left; he didn't wear any clothes over his mechanical parts. His underwear was treated similarly, bearing himself to Robotnik, though the latter would have to step back to get a good look at him.
There was an awkward moment then, as if Robotnik was appraising him. After another few seconds he heard a dismissive "hmph" from the tyrant, before something thick and hot was shoved into his cunt.
"I thought I'd figured out what you were. Guess I hadn't," Robotnik muttered with some sick amusement. "No matter. This is just fine with me."
His fingers were already the size of someone's prick; fat and wide, but rough from his work on machinery. One already felt like a lot, but a second was pushed in shortly after the first, the two sausages scissoring inside of him to work him open.
"How long were you going to pine after me for, hm?" he asked, and Carthis could hear the smirk in his voice. "I'm not stupid, you know. But what time do I have for that sort of thing? I run an empire. But I suppose I'm not above temptation..."
Robotnik slammed his fingers into Carthis, pulling almost completely out before doing so again. Carthis couldn't keep his legs straight, his knees pulling inward and his body slumping over the box as he staggered against Robotnik's forceful hands. At least he was using the one made of flesh.
"Then I thought, ‘why not?' Especially if you were going to keep up your little habit... I wanted to catch you in the act, though. I wanted to make sure to humiliate you for it. For being a perverted little freak who thinks he can just come in and out of my kingdom like he owns the place."
"So I made sure to personally inspect everything you ate. I slipped in a few things, too. Something to make your little jaunt here in Robotropolis last a bit longer... clearly it worked. You're so backed up you're practically experiencing labor contractions. Maybe I went a bit too far with that..."
His otherwise calm musing was offset by his furious finger-fucking, and much of what he said went right into one ear and out the other.
"If it weren't for that, I might be worried right now. But don't fret; I'll let you relieve yourself. Right after I've filled this hole, too..."
The loss of his fingers was both a relief and a disappointment. Carthis took the brief respite to catch his breath, trying to process everything that had happened. His stomach rumbled ominously, his anus pushing outwards even as he clenched down. His legs were just too far apart; the resulting brrrrrpphht made his hole twitch with discomfort. His stomach groaned and lurched, producing a wetter-sounding BLRCH just after. Robotnik had been right, though; as much as he felt like he needed to shit, he hadn't soiled himself yet. Not that he was to terribly confident on the matter... in fact, Carthis could feel his colon and anal tract swelling up with something much harder than gas. His gurgling stomach seemed aware of it, too, as his flatus went from loud, boisterous expulsions to quieter poots and puffs.
He felt the start of his actual movement right at the brink, and it made him feel as if there was a massive cock up his ass. The muscles in his anus shuddered, his hole twitching rapidly as he felt one cheek get pulled back. Robotnik was observing him again, he thought. Was he going to reconsider? Carthis wanted to shit so badly. It felt so big and heavy inside of him, like a wet bag of stones, boiled down into his virtual pressure-cooker of a gut. Deeper within he could feel a wet churning, his intestines contracting and pushing down on some much-less solid matter. Luckily for Robotnik it was trapped behind the plug forming at his exit.
"Hmm... I don't know which I want to do first. Force you to soil yourself as punishment, or fill your stomach with seed. I suppose I'd have to wait to do the latter if I let the former happen first, wouldn't I? I don't like waiting," he growled.
Carthis felt something hot press up against his lower lips. It slicked against them for a moment, up and down, until pressing right into his clit. His non-mechanical thigh twitched, his hips shifting back to try and get a bit of friction. Robotnik rutted the head of his cock right against Carthis' bud, smearing pre and vaginal lubricant over it. When he realized how Carthis was reacting to it he kept it up, going as far as to rut his cock slit over the little bundle of nerves, as if he might be able to push it inside.
As he'd mentioned, however, Robotnik didn't like waiting. He grew bored of his rather quickly, pressing the head of his dick into Carthis' cunt.
At first Carthis assumed he didn't have much to worry about. Robotnik was probably only as big as one fat finger, if not a bit more. But as more of him pressed inwards Carthis started to have doubts. He felt himself stretching wider and wider still, until Robotnik came to a slow stop. He could hear the tyrant's heavy breathing behind him, and just as he thought Robotnik was in-
SPLAP!
Robotnik's hips jerked forward, shoving Carthis forward as well. He was held in place by his mechanical arm, which Robotnik was gripping like one half of a pair of handlebars. The other arm followed after, grabbed and held back and at his sides as Robotnik thrust himself into the smaller man.
"D-OC-TOR!" Carthis yelped, tongue lolling out of his mouth as he was filled up completely. Robotnik wasn't some macho man with a sixteen inch cock, but he was as thick around as he was fat, and his dick fit snugly into Carthis' canal. Each thrust had his head kissing his cervix, which, in a normal person, wasn't actually as deep as porn made it out to be. Six inches was usually the max, though the area was flexible.
"Th-that's right," Robotnik snarled, "cry out! Tell all of Robotropolis who's fucking you senseless!"
Arrogant as always, but Carthis didn't complain. Instead, he did as he was told; calling out Robotnik's name, clenching around his load and the tyrant's cock in an effort to both aid his impending orgasm and keep his bowels contained.
Robotnik's breathing was as heavy as one would expect it to be. He wasn't really a man of endurance, at least, not in this sense. Sweat dripped down his head and neck, pooling in spots in his suit and creating wet marks. He licked his lips, letting his tongue loll out of his mouth as he panted like a dog overtop of his sometimes-subordinate. He was already feeling that tell-tale tightness in his lower belly, his similarly-fat sack tensing up as he prepared to shoot his load into the miserable little cunt beneath him.
Robotnik came hard, gripping Carthis' arms tightly enough to bruise one and dent the other. He doubled over, putting his weight onto the poor man again as he pumped an impressive amount of seed up into his womb. More squirted out around the edges of his fat cock, dribbling down onto his balls and onto the floor. He kept pumping the other man full for several seconds, swelling his belly just enough to be visible, were it not for his already bloated state. Overlanders were like pigs; big, violent things that poured out more cum than strictly necessary, with balls that swelled with disuse and backed-up semen.
That said, Robotnik was very backed up.
The thick, sludgy substance bubbled around his cock until he slipped it out, a slow cascade of cum following. It dribbled lazily down Carthis' legs, thick enough to not rush out all at once.
Robotnik, still panting, released Carthis' arms. The smaller man immediately crumpled to the floor, down onto his knees with his legs spread, arms weakly grasping at the box to hold himself up. Semen oozed out of his cunt in a thick puddle.
Carthis looked dazed, but the heart hadn't left his optic.
"Good boy... Now, put yourself back together. You're going to meet me in my control room within the hour... and you're not going to waste any of this," Robotnik reached down to caress his bloated stomach, earning a weak moan from Carthis.
***
It was with immense difficulty that Carthis had re-clothed himself. He stank of Robotnik's sweat and cum, and his stomach felt heavier than ever before. He held his bloated belly in his hands as he walked, his gait awkward and stilted from a mix of being roughed around and the feeling of cum still leaking into his underwear. He didn't look, but he thought some was dripping down his mechanical leg. A few SWATbots gave him a weird look, and he made a point to ignore them.
He was so close to shitting himself. He had to stop every now and then to relieve some pressure, no longer caring what bots were passing by or what security cameras he was in front of. He'd walk half way down the hall, stop, double over and fart, fight with his now turtle-heading load of shit, then start walking again.
By the time he got to Robotnik's control room he could barely stand. He stood to-straight in the doorway, mechanical hand gripping the frame so hard that it bent, while his other pressed his ass cheeks together. His thighs were practically glued to each other in a desperate bid to keep contained. It was futile, as he felt his bowels give a firm PUSH, opening his anus wider and beginning to press against his underwear.
"Nng, nnuh... no..." he growled, too distracted to notice Robotnik waiting patiently in his chair.
"Get over here, Carthis!" the tyrant bellowed, jolting Carthis back to reality. He awkwardly half-waddled over until he was standing in front of Robotnik, his hands balled into tight fists as he tried in vain to stand at attention. His stomach was visibly clenching down now, the bloated bulge tightening up into his body every time he had to fight off the urge to shit. Robotnik seemed deeply amused by this, if not actively aroused.
"Oh, what's the matter? Struggling? That's what you get for your wishy-washy nature," he snapped. "Now... sit."
The command was given with such conviction that Carthis didn't even think to disobey. He went to one of the security console chairs at the front of the room, sitting down heavily in the hopes that he might push his load back inside. This had the added effect of making him twitch with need, feeling as if he were being plowed from behind by a certain fat controller.
It didn't really work. Carthis was starting to tear up again. Every second that passed was another contraction, and another firm push from his bowels. His anus was opened wide by the log of shit trying to escape, and each time it moved a little further it widened more. The stretching was starting to hurt, and he couldn't feel it stopping any time soon.
"Very good. Don't worry, I'm not going to make you... well, actually, yes I am. I absolutely am, you little wretch," Robotnik sneered. "But I won't keep you from proper relief. So go ahead..." he jerked his thumb towards the bathroom down the hall. "You can try as soon as I decide you can get up."
"V-v-very g-generous o-of you," Carthis growled through gritted teeth. The energy expended to do so pushed him over the edge, and his bowels bore down on their load hard enough to force the start of the log into his pants. He yelped, squirming, until letting out a delighted moan at the feeling of relieving pressure. There was a short series of wet noises following the first push, but it was quickly silent after that. It wouldn't go any further, with him sitting down like this. His almost-orgasmic ploy at relief quickly turned to dread as he realized that, even if he DID get to the toilets, he'd have still humiliated himself.
Screwing his eyes shut, Carthis forced himself to stand. His pants were too tight to allow for any further humiliating sagging, but if he didn't hurry then the hard log still slowly pushing outwards was going to turn into something a lot less solid. He couldn't even glance ruefully at Robotnik; Carthis bolted, trying to keep from soiling himself any further as he rushed into the bathrooms.
He didn't quite make it- and didn't try to- to the toilets. Instead he yanked over a trash can, tore his pants down, and plopped his ass overtop of it. The sudden freedom shot the log of shit so hard out of his ass that it slammed into the bottom of the trash, followed by thick, snaking coils of shit. Carthis moaned and squirmed as his stomach visibly clenched, pushing out more and more of the week-long menagerie of foods he'd downed during his time in Robotropolis. Eventually the unbroken log gave way to something softer, followed by a sludgy avalanche of toxic muck that put Robotnik's factory runoff to shame.
To add insult to injury, a hot jet of piss escaped Carthis, just barely wetting his pants before he shifted himself back further on the trash can. He was too swooned to be angry, though, with his eyes glazed over and mouth open in a silent moan of bliss.
He only noticed Robotnik a few minutes later, when his eyes started to come back into focus and the contractions of his guts were getting fewer and further between.
"Happy, oh disgusting fatass?" Carthis growled, pointedly ignoring another rush of sludge spluttering out of his ass.
"Content with your punishment, yes," Robotnik grinned. "Maybe I was too hard on you, hm? How about I make it up to you... once you're done, I'll prepare a feast for us."
The sly, wiry look on Robotnik's face told Carthis everything he needed to know. He swallowed hard, sweat dripping down his brow.
"Y-yes sir."