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Content is below the cut because it is NSFT. 18+ only, please!
Vampire! MCU Ultron X Gender Neutral Reader Oneshot
Ultron succeeded in his mission to retrieve his new body from those thieving Avengers before they could defile his vision. He watched with a smug grin as his sentinels plugged the Cradle back into various outlets at his base of operations. Inside, he was brimming with excitement. Humanity would look up into the sky and marvel at his novel incarnation; it would welcome him as its savior from a miserable, meaningless existence full of needless suffering and bloodshed. He was going to right the world’s wrongs, and there was nothing that the Avengers could do to stop him once he was fully integrated with his creation.
The lid of the cradle opened upward with a mechanical hiss, allowing chilled air to billow out and over the sides of the apparatus like morning mist over a cliff’s edge. Ultron gingerly began to lift himself from the fog. He paused. Cold. The fog was cold! It was the first somatic sensation he had ever perceived, and though his instinct was to get away from the feeling, he was overjoyed that he was simply able to feel it at all.
Ultron spent his first few hours in his new body just exploring the world around him like a human infant. Though he knew how to walk, his legs felt like jelly. He saw new colors. He heard sounds differently than he previously had, felt the vibrations of the machines that worked tirelessly in his laboratory. It was almost too much for his mind to bear, but Ultron never wanted to stop feeling. He knew that he could never go back to the way he was before.
But there was something wrong. He was still cold, and as time went on he began to notice a gnawing feeling of emptiness in his abdomen. He laughed to himself when he realized that he had been naked this whole time. Under all of their vestments, human beings were so vulnerable, evolved only to live in warm, tropical environments with their soft, hairless bodies.
Ultron was a synthezoid, a seamless blend of synthetic DNA and flawless mechanics. At least, that was the word he invented for himself, seeing as there was no precedent for something, no, someone like him. The word “cyborg” fell short for a number of reasons. At any rate, it would take a long time for the cold to damage him, but if he could only get his hands on a jacket and a pair of pants, he’d be warm enough in no time flat. He sent a sentinel to acquire some clothing for immediate use and resolved to order the rest of his wardrobe online.
His attention turned to the unpleasant feeling in his abdomen. If he did not know better, Ultron would say that it must have been...hunger. That was impossible, of course: His hybrid body was perfectly capable of producing its own energy, and the consumption of organic foods would only serve to damage his inner workings.
The feeling exacerbated over the next few days, as did the coldness, though he was now wearing clothing. It felt ridiculous to wear them, and the sensation of fabric rubbing against his body as he moved was off-putting and strange. It was a necessary evil, he reminded himself. His body must still be working out the kinks. Soon, it would start to generate enough heat to warm him up externally. It was a small price to pay for perfection.
Then it happened. One day, Ultron was flying around his base to secure the perimeter. He usually allowed his drones to do it for him, but he concluded that he would feel better if he simply went outside and felt the wind on his face. His clothing generated drag that was more than noticeable at the speed he was flying, and the wind provided an icy chill in addition to the resistance he was used to in his old body. The sharp sensation was all but forgotten when he spotted a rabbit below.
He was not sure what came over him in that moment, but the next thing he knew, he was on the ground with the startled rabbit in hand. The unlucky captive squirmed and kicked as Ultron sank sharp teeth he didn’t know he had into its soft fur, puncturing the flesh with ease. Warm blood welled up to the surface and Ultron eagerly sucked it up. The metallic taste filled his mouth, exciting him in a way he had never felt before, and he supped with more fervor.
As the rabbit’s lifeforce drained and its frantic movements slowed, Ultron began to feel energetic. Invigorated, even. And warm! So, so warm. He was too enraptured by euphoric sensations to reflect on what he had done and why he had done it. He just knew it felt good. It was simply the price of perfection, he reminded himself as he wiped excess blood off of his chin with his shirtsleeve.
He lived like that for quite some time. The Avengers faded from the forefront of his mind, as did his need to save the world. He was far too occupied trying to figure out why he needed to feed in this way. His body was supposed to sustain itself without the need for external materials, let alone organic ones. It was obvious that something was amiss.
Perhaps the Cradle’s temporary absence from the pristine conditions of his lab caused a malfunction in the completion of his body. Ultron cursed Tony Stark and his allies for meddling in his plans and potentially robbing him of any chance to feel--he bit his tongue to keep himself from uttering the word, human. No, that was not the word he was looking for. The Avengers may have robbed him of the only chance he had at feeling whole.
Ultron was no closer to finding a solution to his problem when he met them. Wanda and Pietro had been away on an assignment he had given them while he underwent these unexpected changes, and they had brought a third human along with them. The twins explained that the new arrival was another rebel for the cause: A mutant like they were, another survivor of von Strucker’s experiments.
Ultron had read the files on Baron von Strucker’s sideshow. Of the one-hundred-and-three participants in his research, only ten survived. Ultron used built-in facial recognition software to match an identity to the person standing before him. They were shocked when he recited their first and last name perfectly. Clearly they had never met someone like him before.
Over time, the new recruit began to open up about their life before and after their time with the Baron and why they wanted the Avengers to suffer. Ultron could feel their anguish in a way that he was not previously capable of. When he met the twins, he felt sympathetic toward them. He felt more than sympathy for the new mutant; he felt empathy. While he did not share the majority of their experiences, he knew what it was like to be brought into a world that wanted them to be something they weren’t. Mutants bore the brunt of that situation. Eventually he began to open up to them as well, though he conveniently left out the part where his new synthezoid body required a vampiric lifestyle to sustain itself. Not even the twins knew about that yet, though they did congratulate him on his success with the new look. That could wait for another time.
Ultron’s relationship with the newcomer flourished. They proved themselves to be incredibly efficient and trustworthy when it came to carrying out new missions. And not only that: During their downtime at the base, they preferred to be in his presence. This surprised Ultron greatly, what with the amount of flirtation they received from Pietro. Surely that would be more interesting way to kill time for a human.
Ultron was usually working or delegating during the mutant’s free time, so they took care to stay out of the way, but there were occasions where their curiosity got the better of them and they asked about his work. Though he always answered their questions drily, Ultron was flattered that someone was genuinely interested in what he was doing. He grew close to the new recruit in a way that he had never anticipated nor wanted, if he was being honest. Sure, he cared about them and the twins, but this was evolving into something more: Something that could jeopardize the mission. And yet he couldn’t bring himself to shoulder them off. He craved the personal attention they gave him and they were more than happy to give it.
“So,” the mutant remarked as Ultron was running diagnostics on damaged sentinels, “you remember when you mentioned that you can feel certain kinds of physical pain?”
“Of course I do. I don’t forget anything.” Ultron responded without turning around as he reconnected loose wires in a sentinel’s neck. “What is your question?”
“Um,” they cleared their throat and hesitated for a moment, “can you feel pleasure, as well?”
“As a matter of fact, I can. The sensation of...well, sensation, has allowed me to perceive phenomena that directly influence my emotions. I experience many pleasures, but feeling the sun’s heat on my face is perhaps the pleasure of all.”
“Sounds nice.” The mutant replied curtly. There was obviously more to the question than he had answered. He searched the word “pleasure” on the internet and quickly realized his misunderstanding.
He began gesticulating with his tools. "Oh. Oh! You were asking if I experience sexual gratification in this body.” He laughed softly. “How could I have been so oblivious? To answer your question, it stands to reason that I can, but I have yet to put that hypothesis to the test.” And with that, he went right back to work. A minute went by and Ultron heard nothing from his companion. He turned to face them and was about to ask if everything was alright when he noticed how flushed they were. He forgot how easily embarrassed these humans became when it came to sexual topics. He was not sure why they were so weird about sex, but were perfectly alright with inflicting violence or killing each other over petty matters. Ultron smiled smugly as a wicked idea crossed his mind. “Would you like to explore that aspect of sensation with me?”
He expected them to stammer or to hastily excuse themselves from the room. Instead, they nodded meekly. It would have been Ultron’s turn to blush if he had the ability to, but it was one that he lacked. He hated to admit it, but sexuality was something that he had been more curious about in recent weeks than he was when he occupied an adamantium husk. Why not explore? He thought. One night of revelry will not change anything between us, anyway.
He moved toward them slowly, so as not to make them feel trapped. His smarmy expression morphed into one of concern. “Are you sure this is what you want?”
The mutant nodded again. “Yes.”
In that moment, he swept them up bridal-style and walked into their living quarters. Since he had figured out the macabre source of his body heat, he stopped wearing physical clothing and instead wore a sort of “suit” that manifested over his form. All he had really done was change the coloring of his body in certain places to give off the appearance of clothing. He also added a red cape for flair. All of this dissolved away as he prepared himself. As he did so, he turned to the human, who seemed to admire him from their position on the bed. Their clothes were still on, he noted.
“Is everything alright? We don’t have to do this if you’ve changed--.”
They stopped him. “I haven’t changed my mind, Ultron. It’ just--.” They averted their gaze. “You’re really handsome.”
Ultron was not ready for genuine compliments: He assumed that this would be a wham-bam kind of situation. He had thought that it was impossible for the mutant to be attracted to him in the way he was attracted to them. Now he was truly flustered by their simple words of praise. “Th-thank you.” He stuttered. At that, his lover began to undress.
One moment lead to another and he found himself pinning them on the bed. This was his first time feeling lustful, and it was almost overbearing, but he reminded himself to go slow and to be gentle. He was, after all, significantly stronger than his partner. He drank in the human’s expression hungrily. Their face reflected the very same emotions that he was feeling: Their pupils were blown wide, their eyes half-lidded, and their cheeks were the darkest shade he’d ever seen on them. It was evident that they wanted him just as badly.
They gingerly wrapped their hands around his neck and pulled him in for a smoldering kiss. The feeling was a novel one: His lover’s lips were warm and supple in a way he simply could not replicate. Though it was his first kiss, Ultron knew what muscles to move and when to make it a decent experience for them. His initial movements were stiff, but with their encouragement, he melted into the kiss, allowing his fangs--which were short until it was time to feed--to drag sensuously across their lower lip. The human shivered and tightened their grip, grinding themselves fervently on his crotch. It was clear that they needed more.
Ultron broke away from the kiss to align his member with their entrance. He designed it to be significantly sized, but not painfully big. It was a brilliant silver that gradually melted into crimson at the flared head. The shaft was thick, lined with strategically-placed ridges and knobs to maximize pleasure, including a bumpy node toward the tip of the head for extra sensation around the g- and p-spots. A part of Ultron wanted his partner to marvel at his cock before it entered them; to watch them practically salivate at the very sight of it, but that would have to wait until next time. He was far too needy to wait, and he knew that the feeling was mutual.
The human spread their legs to encourage his advances. Ultron let out a broken moan as he rubbed his length against them. Their heat and wetness felt exquisite. “Are you ready for me?” He asked through gritted teeth.
The mutant nodded eagerly and gasped a yes in response. The initial penetration was an entirely alien experience for Ultron: Their orifice was so hot and tight that he was worried he might finish then and there, but he managed to hold it off as he began to move inside them. Their deep, guttural moan was ample reward for his efforts. He quickly learned what angles and paces drove them to the edge and used that knowledge to his advantage. He realized that their pleasure turned him on even more than his own, and he swore that he would give anything to hear the sounds they made when they orgasmed, to feel just how tightly they could squeeze around him when their ecstasy drew near. The human began to babble and their movements under him grew more and more frantic. He knew that they were close and adjusted himself so that he could thrust deeper, reaching the most sensitive parts of them. Their thighs began to shake.
They looked up at him. Up until now they were caught between trying to make eye contact and screwing their eyes shut from the intensity of their own pleasure. Ultron intuited that they had something to say, and he wondered if he should slow his pace so that they had the chance to form coherent sentences.
Before he could act, however, they spoke. “Bite me.” He wanted to confirm what they had said, but they commanded, “Now, please!”
And who was he to deny such a request? As he approached his own precipice, he leaned down and sank his fangs into the junction between their neck and shoulder. He made sure to keep the pressure light even as his thrusts grew erratic from his own release. He moaned their name into their soft skin as he started to come down from the high. He wanted nothing more than to be with his partner in that moment as their keening cry turned into small groans and grunts. Their entrance pulsed deliciously against him as he released his hold on their shoulder, leaving two perfectly round puncture wounds with pinprick pools of blood beginning to form. For a moment, he panicked: He hadn’t meant to bite down hard enough to break the skin.
“Ultron--.” The human whispered as their breathing shallowed.
“I know. I’m so sorry. That must have hurt.” He let his member slip out of them as he remotely ordered a sentinel to bring him a med kit.
They laughed breathily and shook their head. “Don’t feel bad. It’s exactly what I asked for. I enjoyed it.”
“Really?” Ultron asked incredulously as he moved to lay down on one side of their bed. Though he was not physically tired, he felt the need to be still and process what had just transpired.
“Absolutely.” The human nestled up against his side as he stared at the ceiling, placing their head in the crook of his shoulder. “Why do you have such sharp teeth if you don’t need to eat?”
Ultron wondered why they had asked about that aspect of his form and not the intricate phallus he had built for himself. He laughed softly, moving his head to the side so that he could nuzzle theirs. “Well, it’s an interesting story...”