Polymorphed Incubus

Story by GryGry on SoFurry

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#5 of Adult

I was playing with the idea of polymorphing D&D style and wondered what might happen if a more powerful being managed to retain their self will and some power afterwards. And then I wondered for what reasons slimes might just be absolute perverts. Here's what my gremlin brain came up with. Any friendly feedback is welcome and appreciated! This can also be found on my FA here.


Chipped bricks and crumbling mortar makes for an unassuming entrance to a supposed deathtrap, a small tunnel open in the side of a coastal cliffface. High up above on the clifftop, covered in trees and thick foliage, is where the ruins of an old castle lie, now dilapidated. The theory is this is an old secret escape tunnel for the royalty that lived there, the only entrance known into the underground network below it dubbed the Treasurer's Folly.

The story I was told is a treasurer found old plans for the castle's architecture and thought valuables might yet exist under there. A team of adventurers were then hired to investigate. They failed to return. The rescue party sent to retrieve them failed to return. Hired mercenaries sent to investigate failed to return. Now there's a reward posted for discovering the lost souls within this place and their downfall, and every so often another bounty hunter trying their luck does not return. And I am so desperate for coin I have no choice but to try myself.

Inside the tunnel is dark and wet. I light a torch as I delve inside, water having seeped in from the nearby coast. The walls look more or less intact, but the floor has a thin layer of cold fluid covering the bottom. Good thing my boots are watertight. As I walk, I see it's not a layer of water but some kind of viscous fluid. Stepping further in, I see it dripping from the ceiling, the path widening out into a carved hallway rather than brickwork that stretches far beyond my line of sight.

That problem becomes less so as a blue glow suffuses the fluid, lighting the entire chamber as it begins to rain down rapidly in small droplets from the ceiling. I notice large globs hissing as they hit my torch, darting aside right as a huge cascade rains down where I was a moment ago. The fluid alters and adheres to the entrance, blocking it off and leaving little choice for myself but to run forward as it begins to shift and flow towards my person. Unsheathing my longsword, I cut down large strands that begin to form between the walls and ceiling in a haphazard fashion in an attempt to block my path.

Strangely, the stuff becomes more solid underfoot the deeper I go. Armor and weapons as well as scraps of clothes are stuck to the walls, floor, and ceiling, some brought to bear by tendrils that strike out. To make matters worse, the floor begins to shift, sucking at the soles of my boots and attempting to grab me with fluid tentacles. Moving fast is one of my few advantages, sidestepping, slicing, and darting between the seeking goo. Eventually, I'm forced to leave the torch behind when a tendril grasps it.

Running up stairs now, I push off walls to make corners without slowing down, doorways flowing closed behind me as I move higher and deeper within. After another flight of stairs, I enter a wide open chamber, and beneath the thick layers of slime, there lies gold and gems of many colors, a small treasure trove. In the center lies a gravid blob glowing, the entrances to the room closing off.

A human, eh? A voice says in my head, light, smooth, and captivating. You're the only one of the 'warriors' sent to set foot in here. And handily so, might I add; you're quite fast for what you are.

_ _ "Thanks..." I say warily, panting for breath and lowering out of my offensive stance for the moment. "And what are you?"

Well, isn't it obvious? I'm an incubus.

"I can agree you're as slimy as one."

Heh. A polymorphed incubus, to be precise.

_ _ "Oh? How did that happen?"

Why, you're the first to ask! Thank you. That castle above this place, of which I'm going to hope you know of if you are confident enough to run headlong in here; it once belonged to a rich noble. I had his heart twisted around my finger, and very long story short his brother was a mage that turned me into a slime to save him while his will wasn't yet entirely mine own. I'm not sure how much time has come to pass, or what happened after, but I slowly regained my wits after draining the first of the men to come through this little dungeon.

_ _ "Drained?"

I'm an incubus yet still. I feed on life essence, but annoyingly enough I can't absorb it to gain more power, so I just sit and collect now. It's all the more ironic that you're a small morsel in comparison to some of the strapping fighters to come through. Almost not worth the effort. But... what can I say? The effort is the fun part with these things!

Tendrils strike from the walls, from every corner and spot there is room, forming a veritable wall that strikes from all sides. My legs are immediately bound and constricted from the floor, but I slice at the encroaching tentacles, one after the other. They dissolve and strengthen the ones below me, their cold touch flowing beneath my leather armor and up my legs. Refusing to be beaten like this, I slam my sword into the floor and bellow with exertion, flame summoning along my body before blasting outwards.

The slime fizzles and hisses, water boiled out of it and desiccating all that is touched by the heat in mere moments.

Wh-what? Ah, that feels strange. I expected pain but this is quite nice, actually! Let's see how long you can keep it up, little human! They purr, the mass itself begin to rise towards the ceiling.

Great. They're a pervert even when being burned alive. Flaming sword in hand, I cut and hack through the goo towards the blob as he sends forth tendril after tendril. I can barely keep it all at bay, swinging time and time again as my harms become tired and shaking. I rush forward and make it to the blob, concentrating my flame to one hand and plunging it up into his hanging form.

No, wait! Don't do thaaa- He yells, the ball of flame flashing.

Then it winks out, entirely subdued somehow.

"Shit..." I sigh, breathing heavily and unable to withdraw my hand no matter how hard I tug.

I'll admit, that was a little mean of me to get your hopes up. My apologies little human. Ah, well, let me cheer you up!

That was my last-ditch attempt and the flames along my body and sword flicker out, leaving me in the glow of the slime as it flows around my legs and body. I let out a small cry as his main form suddenly falls, its weight crushing down and forcing me to the floor. I feel myself pass through the outside layer and into the blob itself, goo flowing under my armor and underclothes before ripping it free. Slime surges under me and I am propelled upwards towards the surface, panting as I break into open air and then gasping the breathes out just as fast as the slime breaches my tight ring. It forces its way up inside my anus and into the belly beyond, quickly filling me up.

I sputter and struggle, but the thick fluid holds me in place as tendrils reach down to withdraw my arms and hold them tightly in place above my head. Try as it might, the goo cannot get under the grip on my sword and eventually gives up.

Shhh, shhh. It's okay, little one. You did your best. Relax now, it's over for you.

_ _ I don't give a reply, trying weakly to shake off the tendrils and fight back to no avail.

Or struggle and I'll fuck you harder. Personally, I love doing that, buuuut you don't seem the big blustering type that deserves being taken down a notch, so it's not as fuuuunnn.

_ _ I yelp as the slime begins to move inside me, roiling in my belly and rubbing against my now hyper-sensitive prostate and drawing a reflexive moan from my lips. I'm powerless but still refuse to give up even as it feels like a dragon is forcing me down on its rigid, spiny dick... each plate rubbing inside me as it breeds me full... I shake my head vigorously, snapping out of it, but the damage is already done, and the tendril conforms to my brief fantasy.

I shudder as I feel pressure along the tip of my dick, forced erect by the stroking goo, and it suddenly spills into my urethra, flooding it tightly full as it travels down and deep inside of me. I groan, feeling my balls bloat and widen, claimed by the invasive substance as more flows up inside my ass and begins to swell my belly.

"W-what purpose does... this serve?" I demand, struggling to keep focus with so much strange and intense stimulation all at once.

My entertainment, of course~

I feel a stroking sensation over every bare patch of skin, massaging and pressing against every erogenous zone while little tendrils feel over my bare skin. Two small ones keep trying to lazily flow into my ears, forcing me to keep moving my head back and forth as I'm played with like a toy. Finally, the pressure becomes too much and the tendril inside my rump begins to hammer into me. Pushed over the edge, I hiss and whine, unable to stop myself from shifting my hips so I might be properly fucked as the slime is forcefully pumped out of my balls in heavy white gushes.

Therrre we go. That's what I wanted to see out of you! He chuckles, sounding close enough to be whispering in my ear. You know, you'd make a terrible thrall to harvest. I think... I'll just use you for my own enjoyment. Until another batch of these so called 'adventurers' come along.

"Nghh," I groan, regaining my senses and returning to my previous struggle.

Oh-hohoho! Lively as of yet, you are. Goooood~

The goo flows right back down my balls and fills them yet again, this time even more and stretching them to a slightly bigger size as my prostate is given no break whatsoever. Continuing to be assaulted and entirely overstimulated inside and out, my already fried brain begins to break down. Yet, being so close I can sense some kind of disruptable signature throughout the fluidic form, magical in nature.

With my free hand, I snap my fingers, generating a spark that floats gently downwards to the goo.

Hmm?

The point it touches begins to fiercely glow, the light spreading throughout the body of goo in a matter of a second before branching out into the tendrils in the room and going beyond through the slimed doorways.

What have you done?! I-I'm breaking down! I can't feel myself anymore!

The goo loses rigidity and I'm dropped, falling into a deep puddle as the light dims and the fluid becomes clear. My legs are shaking terribly but manage to stand up, staggering over to a wall I might lean against as I watch the last of the incubus dissolve. Breathing a sigh of relief, I close my eyes and rest for a moment, opening them again to the sound of something moving in the water as it rapidly boils away without heat, becoming a white mist that begins to churn.

I cover my face with an arm as it the mist is sucked towards something in the room, spraying me with a fine drizzle of water and leaving the entire the area faintly glowing with soft light as the last of the vapor is gone. Slowly, I lower my arm and see a form stretching their arms and legs, soft white flesh being covered rapidly with black fur as a tail sprouts and paws widen outwards on bending legs. The incubus lets out a deep, satisfied breath, breathing in through a wide button nose on a feline muzzle. He turns to me, as if just remembering I am there, his eyes a deep emerald green framed by generous amounts of fur along the jaw and two big, pointed ears.

Pushing a long lock of black hair out of his eyes, the tall cat saunters towards me. I raise my sword warningly, struggling to even hold it up as he approaches. I'm shaking with cold, ashamed and my will wavering. He stops and regards me for a moment before raising an arm, the entire room going dark.

"Shhh," He breathes abruptly in my ear, a ripple that melts my resolve to keep the sword raised. "I'm not going to hurt you. You don't need that anymore."

Clawed fingers turn my chin to face him, his breath hot on my skin as he leans forward and gently kisses me. A long, forked tongue glides along my own as he wraps his arms around me, fingers playing across my back. Slowly, almost grudgingly, my sore fingers relax and my blade clatters to the floor. With a pleased purr, his tail wraps around my waist while his touch goes lower, fingers stroking across the length of my manhood and then below to grasp my still achingly full balls.

"I'd like the contents of this back too, little one," He croons, lowering himself down and gripping my hips as his tongue lavishes affection after affection on my swollen testicles.

His touch is intensely warm and alights lust in me, my shaft quickly hardening in his fingers. Starting with a few pumps of the hand to ensure I am ready; he takes me into his mouth. Whiskers tickle my crotch as he easily slides all the way down and laps at my balls once again, squeezing them with that wonderful tongue as he sucks on my shaft. My knees buckle and I slide down the wall, his hold on me not breaking once as he lowers himself to the floor and continues to slurp.

My breath comes out in short huffs as I begin to make little humps into his mouth, his warm tail ticking across my face and promising so much more if I give him what he wants. With a low whine, I shudder, his mouth a tight vice around my dick as he massages my orbs. Cum gushes into his mouth, infused with the essence he left behind when reforming. Not a drop goes to waste as he repeatedly swallows, loudly and with purring pleasure. His milking continues for longer than I knew possible, the muscles in my groin left sore when he finally pulls his mouth away.

Rising, he wraps his arms around me once more. I feel the air shift, but the dark remains, the two of us free floating in space with only him as my lifeline for physical touch. I could almost cry with relief as he pulls me against his body, legs entwining with my own and gripping my icy shape tightly.

"This form I wear," He says, sharing his warmth with me. "It belonged to that one man you once saw, but could never have, right? He would never look your way. Not towards one of the few remaining members of a race destroy for its aggression and impetuousness."

"Mhm..." I agree.

"You tried everything. Changed your way of talking, walking, even to the point your cute little moans sound like a cat. But he never noticed. And now you're stuck taking mercenary work to afford travel chasing after him. It's sad, but cute. Since you helped me greatly, little one, I'll return the favor. I thought I was stuck as that gloopy form for eternity, but now I'm free and can finally make use of all that I collected. Open yourself to me; let me into your deepest desires and I shall do the rest."

Charmed as I am, it's like second nature to simply relax and nuzzle into his fur, taking a deep breath of his scent as sharp teeth sink into my neck. I feel fur erupt across my body, teeth growing and sharpening beneath my tongue as a muzzle forms and my ears grow upward. A tail sprouts and claws force out of my fingertips, legs shifting, lungs widening, and body growing taller. It doesn't feel like long when he pulls his teeth free, leaving a stinging bite in its place.

"Damn, I'm good," He huffs, taking a deep, aroused breath. "Such a beautiful creature, I would keep you to myself in a heartbeat."

I feel his shaft hardening and grinding against my own, his fingers running over my sensitive barbs as he strokes the two of us.

"I know what you want," He chuckles. "Even if cats got your tongue. Don't be ashamed."

His tail wraps around my own and I raise myself up to sit on his stomach, feeling his erection hot and slick with pre against my cheeks. But I don't know how to proceed.

"Ahhh, I see," He remarks, grabbing my hips. "You'd like some direction is all."

Held as I am, he is free to angle his dick and align it with my tailhole, piercing it with a quick thrust and sinking inside me with a satisfied purr. I blink in surprise as I make a similar sound by pure instinct, only growing in volume as I feel his own barbed dick grind inside me, invading ever deeper until his balls press firmly against my toned cheeks. By then I'm practically vibrating the two of us with my purring. He laughs and gropes my butt, drawing a submissive moan out of me.

Pulling out a little and thrusting in again, he starts a slow, gradual pace that gives me time to adjust until I'm easily rolling my hips and spearing myself down into each hump. He fills me perfectly, knowing exactly how to press my buttons and picking up the pace as I grow to need more and more. Finally, I can't take it anymore and slam myself down, making little crying noises and begging him to breed me as I begin to cum, and the incubus does not disappoint. Pounding into me, he breeds me for all I'm worth, pumping heavy, thick ropes deep inside until it begins to pour out and across our groins. It only provides more lube as his balls begin to slap wetly against my ass.

Instead of slowing down, he flips over and pulls me with his tail to bring my own barbed, still cumming dick against his back entrance. I sink all the way in with a single thrust, making him yelp in surprise, and wildly hammer fuck his blissfully tight tailhole with enough force our balls audibly slap together as I bring us both yowling to a second orgasm. And then a third before I flip him back over and clamp my maw down on his penis, eager to empty him again and again. Grabbed and spun, he brings his mouth in full force down on my own dick and humps up and into my maw, pushing all the way into my throat repeatedly until I am gagging wetly around his length and feeling it swell with cum. It fires directly into my belly before welling up, leaking out of my nose as he drinks my own ample load with ease.

We switch position again and again, rutting like feral beasts until we're both wet, sloppy, and thoroughly exhausted.

"Fuck..." He exhales. "I think that's the first time I've ever felt satisfied."

I burble out a reply of some sort, nose buried in his neck and purring fiercely.

"We'll _certainly_meet again sometime, little one, but I must go now. Keep the treasure; I have no need for it. And I suppose you may have the prisoners."

"They're still alive?" I ask, feeling like I've broken out of a deep sleep as I raise my head.

"Of course. I'm an incubus, not a bloodthirsty savage. Every single one of them without so much as a bruise, might I add!"

"Good... good good," I murmur.

"Rest now. Oh, and you may call me Argus. Toodles~"

I wake up in the chamber and sit up, rubbing my head and inadvertently scratching the back of my new ears. I let out a little purr and give a start, coming to realize these changes weren't some kind of illusion. The glow is nearly gone but there's just enough I can find my sword and the remains of my clothes. There's enough left to fashion a loincloth and I briefly leave the dungeon to grab my rucksack left near the entrance. As I come out, I find myself facing an armed group of guards dressed in heavy armor and wearing colorful scarves that mark them as a unit of elite guards.

Their captain was in the middle of instructing them as they all turn to look at me walking out of the tunnel. The captain turns around and widens his eyes in surprise at my appearance.

"Greetings..." He says carefully. "How deep did you go inside those ruins?"

I give him a reply and completely slur it with my new mouth, rubbing my jaw again before managing to comprehensibly say "Enough."

The soldiers are a mixture of males with a few females, most of them elves with a few bestial races, including the captain who is a big wolven figure.

"Enough? Does that mean you found the fate of those who entered?"

I nod, stating "Incubus. It fled."

"An incubus? Strange. Have you found survivors?"

"Haven't," I struggle for a moment to pronounce the work correctly. "Looked. I think. There are."

"You clearly need rest. Our medic will attend to you; we'll take it from here," He asserts.

I nod and sit on a rock while the medic asks me a few questions, my grasp on speaking quickly improving. He concludes my speech troubles are just due to a magic charm. I nod along, digging through my rucksack for a change of spare clothes. Luckily, I didn't pull them out for the medic to see they are now too small for me. The guards return roughly half an hour later with over a dozen men and women found deeper within.

"We were sent to finally handle this situation since it was growing out of control. But you handled it, so the treasure within is yours to keep," The captain explains. "You've done us a great service; I fear we may have fell to an incubus as well, so I'll arrange for the coin to be moved for you."

"Thanks," I nod.

"You're clearly not from around here. So, it's the least I can do. What's your name, by the way?"

It occurs to me my old debts are no longer binding if I don't tell anyone what has come to pass.

"Fikhir," I reply, picking a foreign tribal name common in the north.

"I get the feeling you're going to do great things, Fikhir."