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Sheathworm - Aiden's Obsession

By Rix Writes

As Aiden lifted his hand to ring the doorbell of the featureless gray prefab shack, he couldn't help but think that it looked almost startlingly mundane. It looked like every other one of the dozens of buildings in the residential area of the border colony, a simple cubical building distinguished only by the four numbers on the formed-plastic door. As he checked his datapad one last time to confirm the address, the snow leopard couldn't help but think it didn't look like the home of someone who took great delight in infesting others with a parasite that had almost every male in the rest of the colony wearing a plastic sheath over their privates lest a wild one catch them.

You're stalling, he told himself, and rang the bell. Almost immediately, the door swung open, and he had his first look at Varec, the kobold he had come to see. He was barely five feet tall, and that included the ebon horns that swept up from his scalp, curling back only ever so slightly. His scales were a deep, vibrant blue that faded in colour across his bare chest and flat belly, becoming nearly creamy white around his genital slit. Aiden shivered. That part of the kobold, at least, he'd seen before, spread open slightly to reveal the surprisingly phallic-looking tail of the parasitic worm within. A parasite like the one that Aiden was going to receive, if he actually went through with his plans for the night. Just the thought of it made his sheath begin to fill out.

An amused chuckle drew Aiden's attention, and the snow leopard looked up into Varec's golden reptilian eyes. Behind them, Aiden could see a barely-controlled hunger and need that was screaming to be sated. “They always stare. To see if it's real. I'll show you more if you want, Aiden. Before you get one of your own. Come in." He stepped to the side and held out his arm, gesturing expansively to the interior of his shack. "Set your datapad on the kitchenette's table and take your shoes off at the door."

As he stepped past Varec, careful to remove his simple running shoes on a mat on the floor before he went any further in, he saw that the interior of the kobold's home was a simple affair like any of the others in the colony. There was a neatly made double bed up against the far wall, looking like it hadn't actually been slept in at all. A small kitchen and dining area was directly across from the door, but it was what was to the right of the door that made Aiden let out a tiny little whimpering mewl.

In the corner was a medical examination chair, but not like one would ever find in any doctor or dentist's office. Covered in black faux leather padding, it had a number of straps and buckles that lay loose and empty, ready to hold down whomever had the misfortune of sitting in it. Aiden recognized it immediately as the chair from the video that had brought him here. He felt his knees growing weak, and he began to shake. “Holy fuck..." he whispered, “It's real. I mean, I knew it was. I knew they were. But holy fuck, I'm here."

Varec was quick to take hold of Aiden to steady him, guiding him to one of the chairs in the kitchenette. “Sit, Aiden. Don't be embarrassed, kitten. We'll talk first. You can back out any time before... well, before it's too late."

To Aiden's relief, he'd been seated in the chair that looked away from the contraption in the corner, though if he turned his head enough, he'd be able to see it. Varec took a seat across the table, looking back at the snow leopard silently for almost a full minute, his expression intense. “So, this is what's going to happen. You're going to sit in that chair, kitten. You're going to let me buckle you down. You're going to tell me how much you want a sheathworm. And then I'm going to go to my closet, reach into my terrarium and get one for you. You could back out, but... I don't think you will. Because, kitten, I can smell your erection." The hunger in the kobold's eyes deepened.

“It's... it's forever though. I... I shouldn't," Aiden protested. He imagined the near-mad hunger being his own. He knew then that it was taking a supreme effort of will for the kobold to calmly sit at the kitchen table instead of begging the snow leopard to fuck him. Would he be able to remain that calm? |He doubted it. He'd likely end up like so many others that had been infested, intentionally or not, with one of the parasites. Sex crazed, desperate for a cock under the tail as often as possible, despite what would come soon after, working in some seedy, nameless brothel. And yet, that was what Aiden wanted to happen to him.

Varec grinned, showing his sharp little gleaming teeth. “No, you shouldn't. But you will." He rose from his seat and stepped around the table, then behind Aiden. He leaned in and whispered, “Every waking second, feeling it pulsing around your trapped cock, stimulating it but inhibiting your release. Filling your bladder with its innards, leaving you feeling like you haven't pissed in weeks, but never able to. Feeling it grown over your nuts, squeezing them so hard you want to scream. Making you want to have a cock, any cock, under your tail, so it'll stop hurting you. And then, hours after... birthing a larva as wide as your pinky through your pisshole."

Aiden groaned, closing his eyes. Ever since he'd found the video of a fox having a sheathworm held to their dick, he'd imagined himself having one held to his. That had been almost exactly a year ago, and he couldn't even begin to count the number of times he'd pawed off to the video, imagining that it was him. Suddenly, he felt Varec's hands unbuttoning the front button of his jeans. “W-wait, what?" he gasped, “We were going to talk, weren't we?"

“Do you want me to stop, Aiden?" Varec growled into Aiden's ear. When he slipped his hand under the waistband of the snow leopard's underwear, Aiden mewled with excitement. “Imagine never feeling something like this again, kitten. Just desperate need. Just the pulsing of your own worm, trapping this..." He stroked Aiden's cock gently, his fingers surprisingly soft and delicate. “So that you can never touch it again."

Aiden gasped and let out another wordless mewling sound, humping up against the kobold's skilled touch. Soon, Varec had freed his cock from where it strained against his underwear, a damp spot soaking through at the tip of the tent. "Oh fuck, oh fuck," Aiden groaned. Varec was good with those fingers of his_._ The kobold laughed and nipped at Aiden's ear.

"So, kitten, we have to get you nice and soft. Best way I figure on that is by going under my tail," Varec murmured. "And if you end up taking your own worm, the one you make from it will infest the next one that comes to me." He stepped around the chair and bent over the table, raising his stubby tail to present himself for Aiden. He reached back under himself and spread his genital slit, letting Aiden see the twitching, pulsing tail of his sheathworm. It really did look like the head of a canine cock for some reason.

Aiden felt his cock twitch at the sight; it was obscenely arousing for him to see the object of an obsession he'd had since the very first day he'd heard of the strange, invasive creatures. And here was someone infested with one, showing it to him, offering to help him get his own cock trapped by one. Without a conscious thought, he reached out grabbed the kobold's hips, tugging back. When he did, Varec let out a low, animal moan that Aiden could tell had both desire and madness behind it.

Varec moved with Aiden, pressing hips backward and lifting himself upward, pushing his tail to the side. "Oh god, yes..." he half-whispered. There was a strange sort of fear behind the words too, a knowledge that sating his own urges was going to result in something truly unpleasant. He nestled the tip of Aiden's cock so it was nestled under his tail in just the right spot. "You j-just sit back, e-enjoy it..." the kobold moaned and then bore down.

"Oh fuck me," Aiden gasped, feeling the head of his cock wrapped in the warm and tight ring of muscle. The kobold was somehow still snug despite all the partners he'd had before, and to Aiden's surprise he was slick, like he'd already been lubed and used recently. It was another part of what the sheathworm did, he knew, but it was one thing to know what the thing did, and another to experience the results. In the back of his mind, he knew that this could be the last time he ever felt something like this.

A delighted trilling sort of chirp came from Varec, a unique sound of delight that Aiden had only heard from kobolds, and soon he was bouncing on Aiden's cock, using the table in front of him for leverage. "Gonna just let it slip onto and into your dick, kitten," he gasped out, a mad sort of glee colouring his tone. "Oh it's gonna hurt. You'll regret it so much. Never touching it again. Feeling yourself getting hard and trapped the whole time. Aching, needing..."

Aiden groaned, the words alone almost enough to bring him past his peak. As he felt the kobold's warmth and tight ass gripping his length, the flesh tugging on the light barbs near the head, he began to pant and growl. The whole while he listened to Varec describe just how the worm would invade his body.

"Feeling that rough probe shoving into your pisshole... oh fuck you've got a nice cock, kitten," Varec groaned, increasing the pace at which he drove himself down onto Aiden's shaft. "The ache when it passes your prostate, invades your bladder. Grows in there. Baloons out. Breaks out into your sack, wraps your nuts and squeezes them like a vise..." Varec pressed his ass up against Aiden's lap, clenching and squeezing as a form of punctuation.

Aiden growled and grabbed the kobold, no longer content to let him control the pace. He wrapped one arm around Varec's torso and held one on his thigh, pulling him against his chest. Still growling, letting instinct take hold, he opened his mouth and bit down on the soft part of the kobold's neck where it met his shoulder, a proper sort of mating bite. As the kobold let out a mix of his unique trill and a cry of surprised pain, Aiden began to buck his hips, shoving upward while pulling downward.

"That's right, kitten, fuck me. Fuck me and let it be the last time you ever feel anything but the worm on your trapped, useless cock. Takes only a few hours, and then it's forever... when you start ah... feeling it tightening on your nuts, you feel the need to bend over," Varec half-yelled, urging Aiden on. "come on... let go, fill me. Give me your seed, and I'll offer the worm it makes to the next poor fucking pervert that wants one."

Unable to hold on any longer, unable to resist, imagining everything that would happen later that night, Aiden came. His yowling, growling cry of triumph and ecstasy filled the room, likely loud enough to be heard in the next dwelling, even through supposedly soundproof walls. As he emptied himself into Varec, he imagined the tendrils that had burrowed into the kobold's bowel drinking in the seed, absorbing it, preparing to use it to make another of its kind.

Aiden slumped back when the waves of pleasure subsided, releasing the kobold both from the bite and his arms. Bemusedly, he realized that he'd bitten down hard enough to draw blood, though Varec didn't seem at all perturbed by it. Instead, when he pulled himself off of Aiden's already softening cock and stood to stretch, he had on his face a dreamy smile. The desperate, barely contained hunger that had hidden just behind his gaze was almost completely gone. The kobold quickly knelt in front of Aiden and lapped up the last couple dribbles of his seed from the tip.

Varec grinned up at Aiden, shivering as he gazed at the spent snow leopard. Aiden's shaft was withdrawing into its sheath, his tumescence fading quickly. “Mnh, such a lovely kitten. Just think. That's the last time you'll ever feel someone around your cock. Did you know it never stops hurting when the worm births a new one?" He stroked Aiden's cheek and then patted it gently. “So, Aiden my dear... now comes the question. The real one. The decision you can't go back from. Do I lead you to that chair and strap you in? Now that you've spent your seed. Do you want it still? With your mind clear, are you going to take the gift I have for you?"

Aiden felt his whole body shudder from head to toe. He was about to step from what had, until now, been just a twisted fantasy to a reality he'd never be able to escape. Unable to form the words, all he did was stand up on shaky legs and make his way from the table over to the medical chair. Shaking, he all but fell into the chair, closing his eyes. "Yes. D-do it... I... do it."

Varec grinned and walked toward Aiden, hips swaying. "I knew you would. I could see it in your eyes. It's more than curiosity for you. It's a compulsion." The kobold reached back under his tail and took up a tiny dribble of semen that had seeped out of him. When he reached Aiden, he smeared it on the snow leopard's muzzle and giggled.

"You know what I love about doing this, kitten?" Varec asked in a low, husky tone as he guided Aiden's right arm to the cushioned armrest and fastened leather two leather straps over it. He repeated the same with Aiden's left arm, then draped another, thicker one over his chest. With each band, the snow leopard's breathing grew more rapid, his eyes growing wider as he was made more and more helpless against what was to come.

As he did the same with Aiden's legs, binding them to the separate leg rests on the chair, Varec fondled the snow leopard's sack. With a wicked smile, he grabbed Aiden's testicles and began to squeeze at them, not even trying to be gentle. He was rewarded with a squeal of pain that turned into a desperate cry. "Bet you've done this to yourself, Aiden. Late at night. Imagining it wouldn't stop. It won't... not until you get a dick in your ass." He kept on squeezing until he saw tears forming in Aiden's eyes, then let go. Stepping on a pedal attached to the bottom of the chair, he made the leg rests separate and ratchet wide so that Aiden couldn't pull them together.

With the snow leopard secured firmly, Varec stepped to the closet and opened the door. "This... this right here is what I love the most. When someone in your position realizes..." He reached into the closet to where Aiden couldn't see what he was doing. There was the sound of a soft tapping and the soft sound of something hinged opening. The kobold turned back to face him, holding something squirming with a pair of forceps. "It's really going to happen."

Aiden had seen videos. He'd seen pictures. Warnings. He'd masturbated to the video in which he'd watched someone purposely infested. Talked to someone who had been caught by a sheathworm, and another who had sought one out. That same individual had directed him to contact Varec. But for all that he'd seen and imagined, the sight of the reddish-skinned, writhing thing held in that pair of forceps made a knot of pure terror form in his belly. The sheathworm was maybe fifteen centimetres long, and not nearly as wide as his cock, though the thing's odd mouth was gaping open, a dark purplish tendril emerging from within whipping around madly.

When one was unlucky enough to get caught unawares by one of the worms, within hours it would integrate itself into the male's body, covering the shaft with its body. It would grow itself into the bladder and testicles, and burrow root tendrils out from the bladder into the rectum, which would spread outward. The screams of the fox that had been strapped to the same chair Aiden was now in had been strangled, desperate.

There were so few options to manage being parasitized by one of the worms. Medications would stave off the desire for sex, placate the worm, but at the same time it never got rid of the pain completely. Surgical options existed, but they left the male often castrated or worse. The host would start to feel a compulsion to bend over for anyone with a dick... and when they did, they would produce a new larval sheathworm within hours, an excruciating experience followed by an intoxicating rush of pleasure, the only form of orgasm they would ever feel.

Nobody should want it. But there Aiden was, strapped to the kobold's modified medical examination chair. He'd come here to do the unthinkable, and now it was coming. Still swaying his hips, Varec slowly approached Aiden, holding out the worm ahead of him. The kobold paused, looking back into Aiden's astonished, terrified eyes, and then grinned. He moved the worm a little closer, delighting in the way Aiden's eyes were focused on the worm. The tip of that probing tendril grew more animated, balooning slightly, sensing its prey. Varec stared directly into the snow leopard's eyes and said in a very firm tone, "Last chance. Tell me you want this. Right now. Tell me you how much you need it. Or I'll take it away."

There was no hesitation, "Please, please do it. I want to be like you. I want to stand where you are. I want to be a fucking slut, I want to be helpless. Out of control. I want to be infested. Taken. I have to do it." Varec sighed happily and lifted the forceps just up to a few centimetres over Aiden's sheath, then dropped the worm.

For just half a second, Aiden had the urge to demand that the kobold grab the worm as it settled on his belly just above his sheath, but that half second was too long a wait, it seemed. In that brief moment, tendrils from the mouth of the worm had found the snow leopard's sheath and dipped into it. The mouth of the worm followed it. Moments later he felt it, the thick, slightly balooned tip of the worm's inner tendril poking at his urethra. "Oh fuck... oh fuck..." he whispered, and then the rough tip of the tendril penetrated his shaft and pressed inward.

Aiden had used sounding rods before, and so he knew how it would feel, at least to some extent, but he wasn't prepared for the sensation of something bulbous and organic wriggling down his urethra, stretching it wider than he'd ever managed before. Pain, not searing but still intense, pushed deeper into his dick, and then he felt the mouth of the worm at his trapped shaft.

The snow leopard had been so focused on watching the squirming, whipping lower half of the worm as it slapped at his lower belly that he hadn't noticed Varec stepping to his side. "Never touching yourself. Feeling every second like you've got a full bladder, but oh, you can't piss at all. You know it feeds on your piss? It really is a strange evolutionary step. I do rather love the life cycle. There's a hidden side to it... you'll come to love it."

"H-hidden? What?" Aiden gasped, shuddering and squirming, bucking as the body of the worm began to envelop his cock within his sheath. He could feel that thick probing tendril deep within him now, farther than he'd ever managed to get a sounding rod, and the ache was becoming a throb. The body of the thing was warm, at least a few degrees hotter than his own flesh, and the inside was covered in hard, sharp little nubs that dragged across sensitive flesh without piercing skin. He knew they only dug in if someone tried to remove the worm once it was seated.

Millimetre by millimetre it squirmed down the length of Aiden's cock, drawing out mewls and gasps. It was constantly pulsing and twitching already, and it hadn't even fully enveloped his length. He felt something thicker at the tip of his cock, and with a low cry he felt it starting to evert bits of itself into his shaft.

Varec cooed softly, stroking Aiden's cheek and whispering encouragingly, "You wanted this. Of thousands who love the videos, the stories, you, kitten, actually did it. Such a dirty little slut. Now you have an excuse don't you, to lift your tail for every single dick you can."

Aiden's eyes filled with tears again when he felt pain deep inside him, more intense than anything that come yet, and he knew that it had penetrated his prostate. "Oh god... fuck, it's t-too much... oh fuck..." he babbled, but he knew it was too late. The promise had been that once it was on his cock, he'd be given no opportunity to back out. He'd be strapped to the chair for ten hours, long enough to complete the parasitization.

The pain blossomed, and he felt the thing's lip reach the base of his cock even as the thickest part of the tendril passed his prostate and slipped into his bladder. Little bundles of flesh travelled down that tendril, and as it did, the tail end of the worm pulled back to reveal what looked like the head of a canine penis at the end. It was how it hid, looking like the tip of a real dick, though it wouldn't look normal on him.

Varec's fingers stroked down Aiden's sides and he kept murmuring in the bound snow leopard's ears. "Get ready, the next part... well, you know what it is. Should be soon. Oh, if I had only one wish it would be that I could feel this happen again to me."

Aiden tensed for what was to come, but nothing could have prepared him. Inside his sheath, the lips retracted slightly, and he felt the sharp nubs that lined them dig in, piercing skin. The shrieking yowl that came from him was pure agony. The nubs were like hooks, and when they dug in they flared under the skin, ensuring that the worm would be near impossible to remove.

The snow leopard slumped, feeling pulses of the thing sending more of its innards through the tendril in his urethra toward his bladder, but despite it aching, nothing was like the searing feeling of having the worm fasten itself at the base of his shaft. "Oh... oh fucking fuck I really did ah... Oh fuck!" He yowled again, and his eyes widened as he stared at his sack. It was twitching and squirming all its own. He felt a weight settle on his nuts, wrapping around them like a hand. They didn't squeeze though, not yet.

There was pressure in Aiden's bladder now, and it was growing. He imagined that nub balooning in him, more and more of the thing's bulk settling there and growing, widening. Already he could feel it drinking in the volume of what was there already, replacing it with itself. Stretching, widening, filling his bladder until it was aching. It felt to the snow leopard like he'd woken up in the morning after a night of drinking heavily, but he knew very well that feeling would never leave him.

Finally, almost mercifully, the initial invasion was complete, and the tiny, drooling nub of the worm's tail poked out of his sheath. He could feel it on his trapped dick, tight and restrictive and hot, always squirming and pulsing. When he looked up at the clock on the wall, he realized that it had been almost a full hour from the start of the ordeal to the end. He could feel the ache still, and knew that over the course of the next few hours it would grow even more.

The whole while, Varec had watched with a wide grin, rubbing the slit where his own worm was trapped. "It's a special, terrible thing to take this. You'll love your new life," he said, and reached down to remove the strap from across Aiden's chest. "I'm surprised just how little you thrashed. I'm guessing the one time you did, it was when it bit down. It's all yours now, kitten."

Aiden felt a low, sick feeling in his stomach. The pressure in his bladder was a constant sensation now, pulsing in waves. He jerked in the other bonds when he felt little stabs of pain, but none of them were as bad as the time the worm -his worm- had bitten down and sealed itself on him. He looked down to where that wriggling tail was just barely visible at his sheath. "Oh shit.... shit shit..."

Varec reached down to explore Aiden's sheath, then leaned his head down to draw his tongue across the worm's tail. The moment he did, Aiden bucked and jerked, letting out a pained yowl. The kobold giggled and drew in a deep breath as he saw a bead of milky white fluid drooling out of the tip of the worm's tail. "How do you feel, Aiden? Having regrets? No real going back now."

Breathing heavily, Aiden tried to calm himself. When the kobold had touched the worm with his tongue, it had clenched on his cock, the hard nubs digging in. He tested the straps that held his arms and legs in place, then let out a little whimper, "Maybe lots, but... but I... it feels right. Fucking hell, I need to pee..." The idea that the feeling would never leave him, stretching on into the years, made his stomach clench.

"I wish I could do it again," Varec said softly, buttoning up Aiden's jeans. "So, kitten, about six hours from now, you and I are going to go out on the town. Best to get the second part taken care of. I do want to remind you though... it will keep taking cum into it. If you take a half dozen guys tonight, you'll end up with three or four 'babies' in a row. The most I ended up with was about thirteen. It was..." he trailed off and shuddered. "You should do it though."

Aiden nodded mutely, then slumped. "What the fuck did I just do..." he groaned. He really wasn't an impulsive cat. He'd wanted to do this despite the consequences from the first day he'd known what the worms did. He'd waited almost a year, really considering what it would mean. And he'd gone through with it, and his life would never be the same.

He loved it.