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mephisto-reporting · 3 months ago

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The Engineer's Gravity - Yandere! Caleb

Plot: You're a biomechanical engineer in Caleb's fleet, incharge of repairs of prosthetic parts. What happens when you become the subject of the Colonel's obsession? Based on this request. Pairing: Non MC Mechanic! Reader x Yandere! Caleb Note: This story is with slightly darker themes. I do not want people to come at me saying Caleb isn't like this. Yes, I know. This is a Yandere! version of Caleb. Please keep that in mind. If you want to be a part of my taglist, please let me know in the comments, DMs or inbox. Content warning: Yandere male, implied deaths, mutilation, mentions of blood, possessiveness, gaslighting, voilence

CALEB'S POV

The faint hum of the Farspace fleet’s engines was a constant background noise, a rhythm that Caleb had grown accustomed to. It filled the silence as he walked down the dimly lit corridor toward the engineering bay, his gloved left hand flexing instinctively while his right hand remained eerily still. It wasn’t the arm itself that unnerved him anymore. No, he’d gotten used to the weight, the cool touch of the synthetic skin against his chest when he rested his hand there. What grated on him was the maintenance—the vulnerability of needing someone else to keep it functional.

The first time he’d come to the mechanic for maintenance, he had been indifferent, as he was to most things in his life. The arm was a tool, no more. Just another part of the machine that was Caleb, the Colonel. She was just another cog in the vast machine of the fleet, a means to an end. He barely remembered their first meeting beyond her clinical efficiency and soft voice, far removed from the barked commands of his officers or the detached drone of his superiors. She’d introduced herself simply, a name he didn’t bother committing to memory at the time, and had begun her work without wasting a second.

He’d sat in silence, his arm stretched out on the diagnostic table, his gaze fixed on the wall as she meticulously checked the connections and replaced worn components. She’d asked him questions—about the arm’s performance, any discomfort he’d noticed—but he’d only answered in monosyllables. He wasn’t trying to be rude; he just didn’t see the point.

She had been… different.

No. She spoke with compassion, with a voice that held an undercurrent of something human. When she’d first touched his arm to inspect it, there was no clinical detachment in her touch—no cold professionalism. Instead, there was a softness, a care.

But she kept showing up, week after week, her presence a constant thread in his routine. She didn’t just maintain his arm; she paid attention. She noticed when he was tense and adjusted her tone accordingly. When she worked, she hummed under her breath—a tune he couldn’t place but found oddly soothing. And unlike the professor who saw him as little more than a prototype for their next experiment, she treated him like a person.

Caleb first noticed it when she spoke to the other fleet members. The soldiers and officers with Toring chips embedded in their bodies, their minds augmented for efficiency but stripped of their individuality, were often treated as tools. Most of the crew barely acknowledged them, but she… she smiled at them. Asked about their day. Made sure they were comfortable during her examinations and modifications.

It wasn’t long before Caleb began to see her differently.

Their interactions changed subtly over time. He found himself lingering in the engineering bay longer than necessary, watching her work under the sharp white lights. She was focused, hands deft as they manipulated wires and micro-tools, her brow furrowed in concentration.

“You’re due for recalibration next week, Colonel.” she said during one session, not looking up from the neural interface she was fine-tuning.

“I’ll be here,” he replied. Then, after a pause, “You’re good at this.”

She glanced at him, surprised. “I’ve had a lot of practice.

“No,” he said, shaking his head. “Not just the work. The way you… treat people. You’re good at that, too.”

Her lips parted slightly, and for a moment, he thought she might dismiss the comment. But instead, she smiled—a soft, genuine thing that made something unfamiliar stir in his chest. “Everyone deserves to be treated like they matter.” she said simply, turning back to his arm.

He didn’t respond, but those words stayed with him long after he left the bay. Caleb watched her closely, taking note of every smile, every laugh, every time she showed kindness to someone else. It made something dark curl in his chest.

The first time Caleb intervened on her behalf, it was almost instinctual.

He was passing through the mess hall when he heard the sharp edge of Lieutenant Varro’s voice. “You know, for all your compassion, you take forever with repairs. Maybe stop coddling the freaks and do your job faster.”

Caleb froze, his blood turning cold. He rounded the corner to see Varro towering over her, his expression smug. She was holding a tray of food, her shoulders tense but her expression calm as she replied, “I do my job thoroughly, Lieutenant. If you’re unhappy with my work, you can file a complaint.”

Caleb’s steps faltered, his jaw tightening. A cold, simmering rage filled him as he turned to look at the man. He wanted to snap his neck right then and there, but he couldn’t let her see this side of him. Not yet.

So he smiled instead. A cold, calculating smile that sent a chill down Varro’s spine.

“Lieutenant,” Caleb said, his tone deceptively calm. “A word.”

Later that night, Varro didn’t return to his quarters. Whispers spread through the fleet about an "incident" during a routine maintenance check. Caleb made sure it looked like an accident—a malfunction in Varro's own bionic enhancements. No one questioned it, least of all her.

She remained blissfully unaware of the lengths Caleb went to for her.

As the days turned into weeks, Caleb’s obsession deepened. He found himself lingering in her workshop longer than necessary, watching her every move. She would smile at him, her eyes warm and kind, and Caleb would feel something he hadn’t felt since he left home for the DAA. A strange, aching need to keep her close.

“You know,” she said one day, her voice light, “you don’t always have to come here for repairs. You can just... visit, if you want.”

Caleb froze, his gaze locking onto hers. Did she know? Had she figured out how much he craved her presence? But her smile was so genuine, so innocent, that he realized she didn’t suspect a thing.

“I’ll keep that in mind,” he said, his voice steady.

He told her about his family one evening, when the workshop was quiet and the rest of the fleet was asleep. He spoke of the girl he had grown up with, her fiery spirit, and the way she had carved a place for herself in Linkon.

“She is strong…” Caleb said, his voice low. “Stronger than anyone I’ve ever known.”

She listened intently, her expression soft. “You must miss her.” she said gently.

Caleb hesitated. Did he? The memory of that girl felt distant, overshadowed by the woman sitting in front of him.

“I don’t think about her much anymore.” he admitted. “There are... other things on my mind.”

He didn’t elaborate, and she didn’t press.

But Caleb couldn’t stop thinking about her. He thought about the way her hands moved over his arm, the way her laughter echoed in the workshop, the way she seemed to light up the cold, sterile corridors of the fleet.

And when he saw other officers talking to her, laughing with her, something in him snapped. He didn’t like the way they looked at her. He didn’t like the idea of anyone else getting close to her.

Caleb began to manipulate things behind the scenes, ensuring that no one spent too much time with her. He assigned officers to tasks that kept them far away from her workshop. He spread subtle rumors, casting doubt on the intentions of anyone who showed too much interest in her.

She never noticed. She never questioned why the workshop seemed quieter, why fewer people came to her for help.

And Caleb made sure it stayed that way. In the privacy of his quarters, Caleb would sit in the dim light, his bionic hand flexing involuntarily as he thought about her. She was his. She didn’t know it yet, but she belonged to him.

And he would do whatever it took to keep her safe. To keep her close.

Even if it meant destroying anyone who stood in his way.

YOUR POV

Lately, you’d noticed something strange.

The crew didn’t treat you the way they used to. At first, it was subtle—an officer averting his gaze when you greeted him in the corridor, a technician hurriedly ending a conversation when you approached. Then it became more blatant. People gave you a wide berth in the cafeteria, whispers died the moment you entered a room, and the occasional sidelong glances you caught were laced with something unspoken.

Fear.

It didn’t make sense. You’d always prided yourself on being approachable, on treating everyone with the respect they deserved. Sure, your work was demanding, and your position as the fleet’s biomechanical engineer meant you often had to be firm when it came to protocols, but you weren’t cruel. Far from it. You treated the crew like people, not machines.

But now? It was as though you carried some invisible aura that screamed danger.

And then there were the... incidents.

The first time, you brushed it off as coincidence. Lieutenant Gregor had been reassigned to another fleet without warning, just days after he’d mocked you during a team briefing. You’d chalked it up to bad luck or his own poor behavior catching up to him.

But then it happened again.

And again.

Officers and fleet members who dismissed your concerns, who snapped at you during high-stress missions, who made snide comments about your methods—they all disappeared. Some were reassigned to far-off posts, others were suddenly discharged for disciplinary reasons, and a few even suffered freak accidents that left them unfit for duty.

The pattern was impossible to ignore.

The only constant in all of this was the Colonel.

Or just Caleb, as he’d asked you to call him when it was just the two of you.

“Colonel” felt too formal, too distant, he’d said one evening as you adjusted the fine motor controls on his bionic hand. He’d leaned back in the chair, watching you with an intensity that made you feel both self-conscious and oddly comforted.

“Just Caleb,” he’d said, his voice softer than usual. “When we’re alone.”

You hadn’t thought much of it at the time. Over the past few months, he’d become a steady presence in your life, someone you found yourself looking forward to seeing.

And lately, he seemed to be around you more than ever.

It wasn’t just during maintenance sessions anymore. He’d stop by your workshop for no apparent reason, lingering by your workbench as you tinkered with your tools. He’d accompany you on supply runs, his tall frame a protective shadow at your side. When the fleet docked at Skyhaven for shore leave, he invited you to join him for coffee or walks through the market district. He’d cook for you and bring you meals to your residence in Skyhaven, unprompted.

It felt... nice.

You couldn’t deny that you enjoyed his company. Caleb had a dry sense of humor that never failed to catch you off guard, and there was a steadiness to him that you found grounding. Still, there was something about him—something you couldn’t quite put your finger on.

The way he always seemed to know when someone had upset you. The way his gaze lingered on you just a little too long, as if he were memorizing every detail. The way his voice dropped when he said your name, like it was a secret only he was allowed to keep.

You tried to push the thoughts aside. Caleb was your superior, your colonel. He’d never given you any reason to distrust him. And yet...

One evening, as you recalibrated the sensory feedback in his arm, you decided to bring it up.

“Have you noticed how people have been acting lately?” you asked, keeping your tone light as you adjusted a tiny screw. “It’s like they think I’m some kind of... I don’t know, threat or something.”

You glanced up at Caleb, expecting him to shrug it off with one of his usual dry remarks. Instead, his body tensed, just for a moment. If you hadn’t been watching him so closely, you might have missed it.

“What makes you say that?” he asked, his voice carefully neutral.

“It’s just a feeling.” you said, turning back to his arm. “People avoiding me, whispering when they think I can’t hear. And then there are the reassignment orders. It’s like anyone who crosses me is... gone.”

There was a long pause.

“It’s nothing.” Caleb said finally. “Tensions have been high since the last Deepspace tunnel exploration. People are on edge.”

You frowned but didn’t press the issue. Maybe he was right. The fleet had been through a lot recently, and stress had a way of making people act strangely. Still, something about his explanation didn’t sit right with you.

“Yeah,” you said, forcing a smile. “That makes sense.”

But it didn’t. Not entirely.

Still, you knew better than to poke your nose where it didn’t belong. You’d learned long ago that asking too many questions could lead to trouble, and trouble was the last thing you needed.

So you stayed in your lane, focusing on your work and pretending not to notice the way Caleb’s presence seemed to permeate every aspect of your life. You told yourself it was fine, that his increased attention was nothing to worry about. After all, you trusted Caleb. He’d always been kind to you, always treated you with respect. And if his gaze lingered a little too long, if his touch was a little too gentle when he handed you a tool, if his smile held a hint of something darker—you ignored it.

Because Caleb was the only person who hadn’t changed. The only person who still treated you like... you.

The ship was silent at night, the hum of its engines a low, constant thrum beneath your feet as you walked through the dimly lit corridors. You’d been restless, the bitter taste of Lieutenant Reese’s words still fresh in your mind. The new Lieutenant had been transferred to Caleb’s fleet three weeks ago and was already causing tensions within the hierarchy of how things ran in the fleet.

“Guess even engineers need quotas filled, huh? They really let anyone take up space on this ship these days,” he had sneered during a systems check earlier. “Bet you’ve only kept this position because someone up high likes the way you look.”

His smirk had twisted into something crueler as he leaned closer. “Face it. You’re not here because you’re good—you’re here because you’re convenient.”

The humiliation burned as much now as it had then. You clenched your fists at the memory, your footsteps echoing softly against the metal floor. You’d worked too hard, poured too much of yourself into your work, to have it dismissed so callously. And yet, his words lingered like a stain, refusing to be scrubbed away.

You were so lost in thought that you almost didn’t hear the sound.

A muffled grunt. A crash.

And then—a sickening crunch.

You froze. Every instinct screamed at you to turn back, to return to your quarters and pretend you hadn’t heard anything. But your curiosity—or perhaps some misplaced sense of duty—compelled you forward. Quietly, you padded down the corridor, following the noise until you reached a maintenance bay.

What you saw made your breath catch in your throat.

Caleb stood over Lieutenant Reese, who was slumped against the wall, blood smeared across his face. The lieutenant’s arm hung at an unnatural angle, his body trembling as he let out a pained whimper. Caleb’s hand was clamped tightly around Reese’s throat, his grip firm but not enough to choke.

Not yet.

“You thought you could get away with it?” Caleb said, his voice low and steady, each word laced with venom. “Insulting her. Undermining her. Disrespecting her.”

Reese tried to stammer out a response, but Caleb’s hand tightened, silencing him.

“You signed your life away the moment you opened your mouth.” Caleb continued, his tone almost conversational, as if he were discussing something as mundane as a supply requisition. “She’s worth more than you’ll ever be. Do you even understand that?”

Reese’s legs kicked weakly, his breaths ragged. Caleb tilted his head, his expression shifting from cold fury to mild disappointment.

“Pathetic!” he muttered, releasing the lieutenant’s throat. Reese crumpled to the ground, wheezing and coughing. Caleb watched him for a moment, then raised his foot and brought it down sharply on Reese’s hand. The sound of bones breaking echoed in the bay.

The lieutenant went limp, his body a lifeless heap. Caleb crouched beside him, his expression one of disdain. “Weak,” he said, his voice barely audible.

And then he turned his head, his gaze locking onto you.

The moment seemed to stretch, the air thick with tension. Caleb’s expression shifted from cold to shocked in the blink of an eye, but his eyes—the ones that had always been so warm towards you—now seemed empty, calculating.

He stood still for a moment, then took a step toward you, his movements slow, deliberate. His voice was a whisper, but it cut through the silence like a blade.

“Don’t be scared,” Caleb said softly, though there was an edge to his words. “I’m just protecting you. I would never let anyone hurt you, never.”

Your mind raced, your pulse quickening. You’d seen this side of Caleb before—quiet, intense, protective—but this? This was something else. He was different.

“Protected me?” you repeated, your heart pounding. “From what?”

“From him,” Caleb replied, gesturing to Reese’s motionless form. “He disrespected you. He questioned your worth. He hurt you.”

His gaze softened, and he took another step closer. “I won’t allow that. Not from him. Not from anyone.”

“This—this isn’t right,” you said, your voice barely above a whisper. “You can’t just—”

“I can,” Caleb interrupted, his tone firm but not unkind. “And I will. You may not see it now, but this is what’s necessary.”

You stared at him, searching for any hint of remorse, but there was none. Only conviction.

“I’ll always protect you.” he continued, his voice dropping to a near whisper. “Even when you think you don’t need it. Even when you don’t understand why.”

You took a step back, your mind racing. But even as you tried to process what you’d seen and heard, a cold realization settled over you.

He closed the distance between you, his steps soft but purposeful, until he was standing right in front of you. His face was close, too close, his breath warm against your skin. “You’ve been through so much,” he continued, his voice soothing, almost affectionate. “You don’t need to worry about the people who don’t understand you. I’ll always protect you.” He repeats. “Even when you don’t ask for it.”

You swallowed; your throat dry. You should have been afraid, terrified even. But you weren’t. A part of you was frozen, caught in the web of his words, of his gaze. He was so sure of himself, so confident, and it was hard not to believe him when he looked at you like that.

His hand reached up, brushing a strand of hair from your face, his fingers lingering just a moment longer than necessary.

“You’re mine,” Caleb whispered, his words not a command but a promise. “No one will ever take you from me. Not ever.”

You should have questioned it, should have asked him what he meant, why he was doing this. But you didn’t. Because in that moment, you realized you couldn’t escape.

Not really.

You knew who Caleb was. You knew what he was capable of. And you knew that the resources of the Farspace Fleet, the professor, and Caleb’s power meant there was no running, no hiding from him. You’d seen what happened to those who crossed you. And now, you didn’t doubt for a second that Caleb was behind it.

But what unnerved you most was the way he looked at you now. Not with malice, not with cruelty, but with something softer. Something almost tender.

“Stay.” he said, his voice coaxing. “I’ll keep you safe. You don’t need to worry about anything else.”

You swallowed hard, your mind screaming at you to run, to fight, to do anything but stand there. And yet... you nodded.

Because deep down, you knew he was right about one thing.

Caleb would never hurt you.

As long as you stayed.

He would never let anyone touch you. He would never let anyone harm you.

You were his, and he was yours.

At least, that’s what you told yourself as you stood there, the weight of his gaze heavy on you.

And as Caleb stepped back, his eyes softening, a reassuring smile tugging at his lips, you knew one thing for certain: you were far past the point of no return.

And maybe, just maybe, it wasn’t so bad.

AN: reblogs, feedback and opinions are appreciated!

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