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The alley boiled with the humid heat of New York summer. The subway vents glimmered with the air that rises from the veins of this city. The air in this part of town was drowning in the scent of cheap Italian food and greasy street pizza; even this late in the evening, after dark, when all the restaurants and food carts have closed for the night. Soon, a thicker and more unpleasant miasma will fill the air.

It was remembering that experience last night that prompted Alex to speed up his pace; he’d rather get back to his hotel before that happens, but at least when he’s closer and on the main streets it’ll be more the smell of traffic that he’ll have to worry about. The bustle there might even be fun to be immersed in; he has a couple hours to leisurely walk back, after all, and it’s not all that far. New York stays open late: a welcome change of pace.

With a few paces down a side street, he suddenly found himself alone, the surroundings as quiet as the city gets; a welcome relief from the constant noise. It’s that momentary stillness that let him hear it, though - a sound like stones clattering on the rooftops, some metallic clanking, a noise that sounded like a shout - or maybe a dog barking? He couldn’t interpret the sounds immediately, nor even tell their direction amidst the echoes from the surrounding buildings. He looked around, glancing up and down the street, then upwards in case-

Splat!

A heavy fistful of a black, tarry substance that smelled faintly of ash hit the back of his head and his shoulder as he turned, not having seen it coming at him at all. Yelling a loud expletive, he cringed in disgust, and picked up the pace. Maybe it’s time to hurry back to the hotel after all, and experience the city some other night!

Within a very few paces though, he could feel it spreading - not the inanimate motion of a thick liquid flowing, but something more like an animal slithering; his disgust turned quickly to panic, what was lurking in this stuff?! He started trying to scrape it off hurriedly, stopping his near-jog and ducking off the smaller street into a side alley to try and get this stuff off him.

It was burning his skin somehow too!

…But his fingers seemed unable to scrape at it much, in fact he seemed to be scraping his own skin more than the goo, and doing little more than coating his fingers in the stuff. But as he withdrew his fingers to try and inspect the stuff more closely, his fingernails looked much sharper, the fingers longer than his brain said they should be. Unbidden, and despite the disgust, all the temporarily forgotten fantasies about goo-creatures and transformation were back in the forefront of Alex’s mind, surging with sudden confused, fantastical hope as he scraped at the goo on his hand to find his skin stained an off-blue colour, and feeling strange, thick… leathery…

And then, he realised, he could feel… It.

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Deep inside his head, almost like a stray thought of his own, Alex sensed its short life had been hard. It had no name; it just wanted to try and hide, and it was desperate, weak, ailing. Humans were not its preferred hosts; the mental image of a stocky, powerful gargoyle flashed through its, and thus Alex’s, thoughts. Relaxing, like a thought of home. It was a creature without a form of its own, and it needed to borrow another body to live. A gargoyle body was what it needed; but a human would, just about, do, like meagre gruel to avert starvation.

Within seconds the thoughts were almost a suffocating, cloying, paralysing force that prevented Alex forming any intent, any plan; and he senses that it wants to control him. Maybe just for a while; maybe just until it’s healed. But it expects a fight, it knows how to fight this internal battle for control, having done so many times before.

Push through a tactile, and pheromonal, mush of sensations to confuse and disorient for a few crucial moments. Pierce the skin, make for the heart, let the blood spread its essence quickly through the body, all the faster when the terrified host’s bloodstream filled with epinephrine; push through the blood-brain barrier, reinforce its control, build defences, and try to weather the storm of its host’s mental struggles.

But Alex also sensed… confusion, from it. No host had ever had even a hint of a positive reaction, before… no interest in the changes wrought by its merging with them, no wonder at what the sensations might be. Perhaps the smooth head, the lack of that obstructing hair, had made its contact with him easier, given him less time to panic and fight back… but no, it could sense that wasn’t it, at least not all of it.

Suddenly it had an option. A path of least resistance; not something it had encountered before. It was suddenly out of its depth - was this a good idea? Perhaps it shouldn’t change a strategy that had worked so often.

But it was weakened, in danger, desperate. Maybe this was… what it needed. It wanted hope, it wanted to be hidden; maybe a human less willing to fight - maybe even willing to comply without a fight! - could be its saviour.

The image floods Alex’s mind, a specific gargoyle; slim but powerfully built, red scaled and white-haired, clad only in a loincloth. It was an image that dripped with threat, of danger. A pursuer, who was seeking to trap it, destroy it. Nearby. Danger.

It was an offer, though. A request; it was not used to communicating, it was not… good at it. But it wanted Alex to help it, at least to not fight it while it took control. Maybe if Alex was unwilling after all, it would just flee, and try to find a host with a… more familiar response. If he was willing maybe they could… help each other somehow?

It hesitantly tried releasing Alex from its paralysing mental vice-grip, letting him form thoughts more coherently… he’d need to agree…

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The confusing fog, the pressure of thoughts-not-his-own flowing through his head, abated, and Alex’s body un-froze abruptly, almost collapsing down the alley wall to his knees. It was still hard to think… a single frontal cortex was a poor piece of hardware for two consciousnesses, but there were a lot of potent desires starting to bubble in Alex’s reptillian hindbrain; an area that the goo-creature never liked to inhabit, sensing that the subconscious desires within were something primal, icky, beneath it somehow. It just preferred to ignore it all…

Alex formed a want; hazy, testing the waters, scarcely believing any of this was happening - some dickhead must’ve just served him magic mushrooms on a pizza as a joke, or something - but still, why not go with the flow for now..?

He reached up, grabbing a fistful of the gelatinous mass that still sat on his shoulder, trying to push itself through his clothes. Now that he was asking for it to cooperate, and the creature was asking the same of him, he found it easy to scoop up a lump of the mass; he sensed its discomfort as a linking tendril was stretched thin when Alex pulled his handful away from the main mass.

It didn’t quite know what he intended, didn't understand the mental images; it was out of its depth. Alex hardly did himself either, as he pulled open the waistband of his pants and underwear, and upended the goop onto his already tumescent groin, groping himself and rubbing it into his flesh, wondering how much it might change him.

He could live with it if it’s just a coat of scales that might form, but what if it was more..? The mental image it had pushed at him, the white haired gargoyle, reminded him of his own similar persona, maybe he could have a cock like that… be like that, even..! It was.. All of it was… a hot idea…

As the burning sensation started on his shaft and balls as well - the sensitive skin magnifying the painful feeling - he started wondering if he should regret it. But he tried to push through it…when would a chance like this happen again, after all?!

It felt unsure what its host was doing; but there was such a richness of blood vessels in that area, it was so much easier to penetrate the body. And such a richness of nerve endings that the sensation was almost incapacitating for the host. But for all that this might be useful to know in future, it didn’t understand why its new host would be doing this to himself.

But the mental images it could sense were strong and clear; of something other than the organ that already lay between the human’s legs, something larger and more bestial, more sensitive, more… appealing?

The primal feeling of attraction to the thought was alien to this alien creature, but the feeling of pleasure, anticipation, from these thoughts of strange, bestial, even feral creatures that flashed through its host’s mind was clear. This was something quite novel to it.

It began to feel ever more uncomfortable, hot, strangely… desirous of something, some primal need leaking from its host. Something that did make it curious… Perhaps it should have explored this subconscious aspect of humans more often. But perhaps it wouldn’t have been able to interpret this without a cooperative host like this.

It flowed more around Alex’s head as the human clutched at his burning, aching crotch, grunting in discomfort and wondering if his idea had been such a good one after all. It pushed one tendril gently over the upper lip, under the nose; maybe it could try something subtler from pheromones, too? It had had to experiment with those at first, and gotten some strange and mixed reactions at times, but…

Alex’s nostrils filled with a strange melange of scents, before finally settling into something more like… tobacco smoke, and old leather. Something that made him feel hornier, starting to tip that burning pain into something more like… pleasurable anticipation… he wondered what the creature might change him into, possibilities and mental images of past scalesonas flooded his lust-addled head.

The creature… seemed scared, though. It wasn’t intended for humans, of course; simply to survive in a human host, it had to cause some alterations, add in some magickal strand that it could feed from, hence the changes that Alex had started to experience. But too much meant it couldn’t hide any more, and that was lethally dangerous to it.

It didn’t… want to keep changing Alex, but…

It sensed Alex’s fixation, at least on the image of the larger, meatier, monstrous organ that had led Alex to rub it over his shaft, and sensed that it would need to give him something, this at least… but it would need to bargain, compromise. Yes… when its host regained his senses…

And so it pushed in; connected with itself inside Alex’s body; and began something new - trying to make specific changes, localised, but more extreme than it had dared try before. Maybe it could even…

It tried shifting its approach, trying to stop its aggressive sloughing off of the outer skin, and the layering of the lower layers of skin into thicker, leathery keratinous hide and scale, stopped simply bombarding nerve endings with chaotic sensation and tried something more modulated, slower…

Alex gave a gasp of relief as the burning sensations started to ease, a feeling more like a vigorous massage, a gentler touch rather than a chemical injury. His changed hands stayed groping, a little feebly, at his shaft; he felt desperate for more, but the newly unfamiliar structure, the feeling of trying to jointly control his body with another presence inhabiting him, was becoming too confusing, his motions lacked coordination and coherence…

It sensed his desire though, the mental image of hands pumping at his length, the primal stab of desire for something amazing to happen… and, curious, sensing that this might be some powerful new avenue for manipulating humans in future, it began to stretch itself, shake itself and rub, along the length, trying at first to aid Alex’s fumbling stimulations, but quickly sensing his pleasure or discomfort at particular motions and narrowing in on those that felt good…

Alex groaned, dropping to all fours now as the goop wrapped around his shaft and started gently rubbing, teasing, exploring him. The sensations and the need were already overwhelming but he didn’t want to cum so quickly, this had barely started… it’d better have barely started, anyway!

For it, this was a new sensation; their mental connection was tenuous and loose, as it warily circled a host who it remained unsure of the intentions of. But its biology was not made with the capacity for sexual pleasure, it had not even tried using any part of its hosts like this, considering such things to be primal, animal urges, beneath it.

But now, pushed into it reluctantly as part of this unexpected bargain, this was… good.

It could sense Alex’s body on a level Alex himself was unaware of; could feel the pulsing muscles in his abdomen, the faint electrical disturbance as nerve signals bounced around between organs, responding to the pumping of his cock; it had little idea what would happen when those signals reached a crescendo but it could sense that they were doing just that, and could sense from Alex’s thoughts that it was what the human craved feeling, the source of that primal desire.

So it… didn’t want to just allow that quite so straightforwardly, it wanted to experience this new, pleasurable sensation. It dampened the nerve impulses, prodded and disrupted the muscle fluctuations… slowed the progression, stopping when it sensed discomfort, it didn’t want to stop, just… prolong. Its motions along the shaft slowed, too, and it let itself work the changes, even the more painful elements, a little more quickly, disguising it less. The peak stayed resolutely at bay, within easy reach, teasing…

Its thoughts nestled ever closer to Alex’s, its own forming intentions flowing more freely into its host. Its desire for exploration, its surprise, the novelty of finding not simply a host willing not to fight, but a host willing to teach it all these… new things, new feelings, new approaches.

It was scared of where all this might lead, but it was too caught up in the moment to resist trying for… just a little more… Alex’s thoughts increasingly flowed back into it as well, and this too was a novelty for it. It had never tried to experience a host before, just trap and observe; it was far more confusing to it now than it had expected.

Alex could feel as the skin on his cock loosened and pulled back, exposing a thicker length with an increasing swelling near the base, around which the skin tightened delightfully then slid behind, to form a scaly sheath; the tip flared out into a flatter head, something more like a horse’s, growing in length as the corrupting goop slowly slid into it, the alien creature feeling the pleasure almost as intensely as Alex himself…his balls swelled, hair follicles falling empty and filling in with scale as his scrotum sagged lower under the weightier contents.

Alex grunted with pleasure, the new larger organ giving so much more raw area for sensation, the goo still on the surface turning to a delightful lubricant as he tried to grope at himself again, pushing through the confusing fug of shared-sensation-thought, but finding the layer of goop was thick enough to dampen the sensation of stroking himself…

He reached up instead to his ears, his nose, his forearms, rubbing at the other subtly changing parts of his body. He could sense how the creature had tried to make the sensations more pleasing, less painful, and it was working, his whole upper body was thrumming with pleasurable sensations, which were spreading as the goop slid gradually down his legs to his feet. He could feel the points of sharper teeth in his mouth, the strange pain of a forming horn poking his scalp from the inside, the point that his ear had started to form into. Was his face more stretched out than before..?

More.

It had intended to stop here, to give the human this one thing he wanted, that was the bargain wasn’t it? It was time to go, to hide away, to work out what to do next. Maybe it could even stay around this human, if he was a willing assistant, perhaps there were new paths open that were never there before…

But the closer it wrung itself into Alex’s increasingly lust-driven thoughts, the less clear it became what it should be doing. They both wanted, needed, this…

But it would be hard to hide! Impossible! Dangerous! But it would feel so good…

Its control slipped, or perhaps it succumbed to temptation leaking from Alex; and Alex’s upper body started to expand. With the way his nerve endings were being carefully modulated, it felt strangely like his whole torso was getting erect, like his growing muscles and new skin were as tender and sensitive and pleasing as his cockhead felt..!

More, his reptilian hindbrain urged. Bigger muscles, thicker scales, a long tail, horns, meaty paws and sharp claws, yessss…He grunted in pleasure, then more deliberately grunted and groaned again, relishing the strange deeper rumble in his larger chest - more bestial, almost a growl…

No, no, it thought, this should stop, have to blend in, have to hide… but as the seams started to tear on Alex’s shirt, the bulkier frame within starting to tear out, it found that it couldn’t stop. Or didn’t want to. This felt too good, amazingly good, it never knew it, or humans, could feel this good…! How far could it reshape a human form, it had never dared try, always too drained by the struggle for mental control, but here, now, it wasn’t struggling for control, just struggling to entwine itself, to feel the blissful feelings, sink into them and enjoy what its host was teaching it…

“…are you okay? You’re hurt, let me help…” came a voice from behind him; and as Alex turned his startled, changing head, he saw the red-scaled gargoyle with the white hair dropping into the alleyway.

Brooklyn, it knew. Danger.

Conflicting responses rushed through both Alex and the creature. Panic and embarrassment at being caught in an intimate moment; panic and fear at being caught in a vulnerable moment; the confusion as the two similar thoughts clashed, almost merging but bouncing apart as the momentary gestalt sensation of synchronous pleasure fell away.

Yet it didn’t feel weak any more; the changes to its new host were like a breath of fresh air after almost suffocating, or a taste of fresh-baked bread in the midst of starvation. Alex’s mental images were of strength, power, desire… and so it felt stronger, more powerful, too…

Their response was instinctive and unanimous, Alex’s clawed hand lashing out toward the approaching gargoyle as if throwing something; and the goop subtly layered into his changing flesh spat itself out, a fine web of tendrils encasing the startled gargoyle before he could realise that this wasn’t an injured human bystander.

At the last moment, the gargoyle saw it coming, and tried to leap aside; a tendril snagged a claw, and he fell heavily to the ground, scrambling onto all fours to leap further away and out of reach, but the tendrils reacted fast, wrapping him like a blanket, pinning his wings and arms, holding him fast.

Alex sensed the goo-creature’s surprise; it really was stronger, or perhaps it had weakened and injured the gargoyle more than it had realised. Either way, he wasn’t able to struggle free as easily this time.

It wanted to flee, quickly. Hide. The urge was strong.

But as Alex stood, balancing awkwardly with his shoes feeling far tighter than they should, and having to resist an urge to walk on tiptoe, there were…. Other urges that were starting to come to the fore.

Alex cast a lecherous gaze over the young gargoyle, the lithe but well muscled body was hot. Through the goo-creature he could feel what the gargoyle’s skin was like, could sense his breathing and his heartbeat… the shape of his form, even under the loincloth that concealed his groin from v