HTP adjacent eldritch entity
Generally speaking, the creature known as The Soldier could maintain a human appearance, for a time. Consensus among the observation and containment teams was that this was only because the host had been human once -one James Barnes- but no one was actually sure.
Mostly because no one was actually sure how much of the creature was some kind of mutation thanks to reverse-engineered super-serum and how much was due to the other experiments, the ones no one was supposed to know about but most of them did, if only because the threat of getting shoved into a portal or a cocoon in the deepest of sub-basements was an effective one.
Of course, the threat of being given to the creature to play with was just as effective, because some people didn't come back from that at all, and some came back changed, and it was why subduing it again when 'his' shape started to slip on a mission was always the preferred method of making sure it actually came back to base.
No one talked about the village in the Carpathian mountains that just went missing one day when the Soldier was late returning from a mission, nor did they talk about how it took two full STRIKE teams and the -then still new- Captain to wrangle the creature again afterwards.
That had been some years before, time was a slippery thing for the Soldier, and was definitely becoming so for the Captain, being the creature's favorite plaything had some -dubious- benefits, it seemed. Right at the moment the two of them were laying low in a safehouse, waiting for the extraction team to make contact.
The Soldier rolled his left shoulder, like the prosthetic was too heavy, or had a bad connection somewhere, which was entirely possible, but was also a sign that his shape was starting to slip. The tentacles could come from anywhere, and often did, but the mangled socket of that left arm was where they usually started first, especially when the mission was over and he had no real reason to maintain the still-human shape.
Mostly because no one was actually sure how much of the creature was some kind of mutation thanks to reverse-engineered super-serum and how much was due to the other experiments, the ones no one was supposed to know about but most of them did, if only because the threat of getting shoved into a portal or a cocoon in the deepest of sub-basements was an effective one.
Of course, the threat of being given to the creature to play with was just as effective, because some people didn't come back from that at all, and some came back changed, and it was why subduing it again when 'his' shape started to slip on a mission was always the preferred method of making sure it actually came back to base.
No one talked about the village in the Carpathian mountains that just went missing one day when the Soldier was late returning from a mission, nor did they talk about how it took two full STRIKE teams and the -then still new- Captain to wrangle the creature again afterwards.
That had been some years before, time was a slippery thing for the Soldier, and was definitely becoming so for the Captain, being the creature's favorite plaything had some -dubious- benefits, it seemed. Right at the moment the two of them were laying low in a safehouse, waiting for the extraction team to make contact.
The Soldier rolled his left shoulder, like the prosthetic was too heavy, or had a bad connection somewhere, which was entirely possible, but was also a sign that his shape was starting to slip. The tentacles could come from anywhere, and often did, but the mangled socket of that left arm was where they usually started first, especially when the mission was over and he had no real reason to maintain the still-human shape.

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The mission had gone well. The handlers and higher-ups sometimes seemed reluctant to let the Captain and the Soldier perform missions on their own, and the Captain didn’t understand why. They were a perfect team, perfectly forged by Hydra.
But in the quiet of the aftermath, during the waiting, sometimes there were… strange things. Flickers of thought and memory, like lingering tastes on the tongue or a whisper of music on the wind—tantalizing glimpses that the Captain struggled to hold on to.
They were nothing. (he wanted more. he never got more. the moment after debrief he’d be taken back to the doctors and emptied out again.)
The sound of the plates shifting in the Soldier’s metal arm drew the Captain’s attention and he looked over, performing a quick assessment of the Soldier’s status. He checked his communicator, reminding himself they still had several hours to extraction. They were in a secure location, and they were alone.
And the Captain wanted… well. No. Operative regulations dictated that the Soldier should be permitted controlled release of its human form as a sort of pressure release, to prevent an uncontrolled release, which could lead to potentially catastrophic repercussions.
The fact that the Captain found a certain level of… enjoyment in letting the Soldier relax in that manner was entirely beside the point.
“Soldier,” he said softly. “You have permission to conduct a level two release.”
Level two was partial release for non-combat situations.
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He didn't go hazy at the edges, not really, but the shift was difficult to parse, sort of an unraveling, even when it was just partial. The noise he made -especially behind the muzzle of a mask- was mostly a sigh, though it felt like it should be a hiss, even a growl, it pressed on those same parts of the human hind-brain, those instinctive parts that told a person to run away.
The Captain never seemed to have that problem, though, something that puzzled and concerned the Hydra scientists at turns, since repeated close -intimate- exposure to the creature had never built that kind of immunity in anyone else.
There was still a distinct torso, arms and head. Legs were still there somewhere as well, but not in any way that really mattered, it was the shifting, coiling tendril-like mass that seemed to erupt from his spine keeping him supported now, and it was only a moment before one of those, spade-tipped like a squid or a cuttlefish extended slowly across the space between them, wriggling along the Captain's shoulder, working in between the harness holding his shield and his uniform, chances were good that it would work down under the collar of his uniform next if the Captain didn't object.
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He didn’t care what they said. They could talk as much as they wanted, as ling as they didn’t try to take the Captain and the Soldier away from each other.
As the Soldier relaxed, the Captain could feel the shift in the air. He shivered, not from any change in temperature, but from… it was difficult to describe. The texture of the air seemed to change as the Soldier unleashed his strange, inhuman self.
There was also a certain degree of anticipation which the Captain couldn’t resist.
He chuckled lowly as the tentacle began its possessive explorations. “Hello there, sweetheart. Are you checking up on me? Or are you looking to play?” He lifted a hand and stroked two fingers along the length of the appendage. “We have time, if that’s what you’re hoping for.”
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A cluster of smaller, more featureless tendrils emerged from the mass, making quick work of the harness, setting it aside, within easy reach but out of the immediate way, as the broader appendage did, indeed, wriggle its way down the back of his collar, inching down along his spine, that spade tip finally spreading flat against the small of his back, the length of the thing an easy weight, even a pressure against his spine, only slightly below the Captain's own body temperature.
The whole of it was pulsing, leech-like, not yet synced to the Captain's heartbeat, but it wouldn't be long before it was, and the creature that was the Soldier knew that was how it calmed prey, relaxed it, made it feel secure. Not that the Captain was prey, not that kind, and it was a knowledge that slipped away again almost as soon as it had surfaced.
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Opening his eyes again, he tilted his head as he considered the Soldier. After a moment, he nodded, smiling, and made his way over, closing the--admittedly smaller than strictly professional--distance between them to presumptuously straddle the Soldier's lap, resting his arms over the Soldier's shoulders with a cocky grin.
"Whatever you want, sweetheart," he said, his eyes bright and his voice husky with desire. "Can I take off your mask? I want to see you."
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Mostly it was because he liked having access to the Captain's mouth, but more than a little bit because he liked the Captain having access to his mouth.
More of those thinner, featureless tendrils had started to wind around the Captain's ankles, working slowly up his calves, not working to get him further undressed, but to keep him stable and balanced and secure right where he was. More than likely they wouldn't bother stripping the Captain bare, only moving aside what portions of the uniform were a direct hindrance.
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"There you are," he said quietly, and put the mask aside so he could hold the Soldier's face in his hands, stroking his thumbs across his cheeks. "There's my beautiful Soldier."
A name whispered in the back of his mind, just barely out of reach. The Captain knew the more he reached for it, the more it would elude him, so instead he settled into his spot, relishing the feeling of tendrils claiming him, holding him, anchoring him, and leaned in to kiss the sweet lips he'd been longing to see.
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The noise ratcheted up just a little at the kiss, one hand lifting to press flat against the Captain's chest even as the spread of the tendril at the small of his back did the same, stretching, wriggling to cover more area and pressing closer at the same time.
Likewise those around his legs curled tighter, keeping him fully secure, more winding around his thighs in the process, making sure he couldn't easily get away -not that he'd ever tried to that the Soldier could remember- and he returned the kiss hungrily, licking eagerly into the Captain's mouth. After a moment it was clear that his tongue was delving deeper than a human's would have been able to, teasing against the back of the Captain's tongue, and ready to dip deeper. It had used those thinner, more featureless tendrils to fill the Captain's throat before, apparently enjoying watching the process, so using his tongue instead was new, but familiar enough, and there was no doubt that it could do exactly the same as any other appendage.
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He was already heating up, already feeling the need for more, his hips starting to grind against the Soldier's as much as he could with all the tendrils holding him in place. He wound his arms around his lover--not nearly as flexible as the appendages holding him in place, but just as strong in their own way.
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That growl of a purr ratcheted up again as he finally drew back, breaking the kiss before withdrawing his tongue, dragging it over the Captain's lips, like he was savoring a favorite treat, which he was, in a way. His voice was rough when he spoke -since he so rarely did- just as low and insistent as the rumble emanating from his chest was, "Mine."
The thinner tendrils around the Captain's thighs had finally coiled themselves high enough to set to work getting his uniform open, loosening his pants both to draw the Captain's cock out into the warm space between them, but also enough so that the slick starting to secrete from the tendril at the small of the Captain's back would only cling to skin instead of fabric.
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“Yours,” he whispered in a raw, ruined voice. He leaned in and pressed his lips to the Soldier’s ear so any spying equipment that wasn’t already fried by the Soldier’s aura couldn’t possibly pick up what he said next.
“No one owns me but you.”
For all his loyalty to Hydra, the Captain was only truly devoted to one person.
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But he wasn't going to.
Instead the smile went a little too sharp at the edges, entirely hungry and more than a little possessive. He angled his head in again to lick at the Captain's mouth once more, cleaning him up in preparation to make a mess of him all over again, just nuzzling at his cheek before swiping the tear-tracked skin with the flat of his tongue, mostly human-shaped once more, though smoother than it would have been if he were actually human.
He drummed his fingers against the Captain's chest, left hand still just resting there the other one was... somewhere in there, the same way his legs were, though it was hardly important at the moment, especially when the left was placed to keep him where the Soldier could watch his face as the tendril at his back slid -undulated- lower, dipping into his cleft, teasing over his entrance, spreading slick as it did.
The smaller ones had settled against his thighs again, apparently content with just freeing his cock for the time being, not moving to touch him further at the moment. It was something that usually meant he was in for one hell of an overwhelm before the Soldier was finished with him.