Senku x Reader (because there’s not enough)
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A storm brews over the open sea as the Perseus sails toward America—its decks weathered by time, its passengers driven by hope, and one of them unraveling from the inside out. Senku Ishigami is used to solving problems. Logical, calculated, composed—he’s rebuilt the foundations of humanity from stone. But not every equation has a clean solution.
When a crewmate falls ill and Senku finds himself slipping into something he can’t quite define, the people closest to him begin to worry—but no one dares to confront the scientist whose entire identity is built on control. As days blur and silences stretch, tensions simmer beneath the surface.
Because no one wants to admit what they know.
Because Senku isn’t ready to face what he can’t fix.
And because sometimes, the scariest thing isn’t what’s lost—it’s what you’re willing to believe to keep going.
Series
- Part 1 of Senku x Reader (because there’s not enough)
- Part 1 of Until The Numbers Run Out
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You’ve got a Parasite Growing Inside You. by RoyalCupid
Fandoms: Dr. STONE (Manga), Dr. STONE (Anime)
17 Jul 2025
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In a world where survival is rebuilt from stone and science, one reckless night changes everything. You weren’t supposed to feel anything. Not for him.
And certainly not like this.
But now, with the world still teetering between progress and ruin, you're carrying the first child of the new age— Senku Ishigami’s child. What should be a simple matter of biology quickly spirals into something far more complicated.
Because while science can explain the symptoms, it can’t account for the silence, the glances, or the weight of a future no one was prepared for.
Caught between revolution and rediscovery, you remain by Senku’s side through sabotage, war, and impossible invention—even as he refuses to call what’s happening between you anything but practical. But some things aren’t meant to be solved with logic.
And this new world? It’s rewriting the rules faster than either of you can calculate.
A slow-burn, canon-divergent journey through science, survival, and a love that’s anything but theoretical.
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A Truth Serum, it’s for “Science”! by RoyalCupid
Fandoms: Dr. STONE (Manga), Dr. STONE (Anime)
11 Mar 2025
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“There’s no telling who we’ll run into in America,” Senku began, his voice taking on that calculated, matter-of-fact tone that always made you feel like you were two steps behind. “If we encounter hostile forces, we’ll need an advantage. Something to make them talk. This is a truth agent—if it works.”
.
.
.
(I wrote this because there was an itch in my brain. HORRIBLY self indulgent!)
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You matched Senku’s pace, hands tucked casually behind your head as you strolled along. “So, any new inventions you’re cooking up?”
Senku’s eyes glinted, the gears in his mind already turning. “I’m modifying the potato battery from class. Thinking about making a makeshift generator.”
Your eyes widened. “That’s actually pretty cool. Does that mean you’ll have a backup for when Byakuya tells you to quit staying up late?”
Senku scoffed. “Please. Like I’d let that stop me.”
You laughed, the sound light and genuine. He felt his chest tighten just a bit but quickly dismissed it. You were always like this—teasing, smiling, laughing.
It was part of your charm.
But his fingers unconsciously brushed against the envelope still in his pocket, and he glanced at you out of the corner of his eye. If only you were just a little more direct.
Well, he supposed he could wait a bit longer.
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Purely Scientific; A Physiological Response. by RoyalCupid
Fandoms: Dr. STONE (Manga), Dr. STONE (Anime)
04 Mar 2025
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Senku barely shifted in his seat, but his brain had already latched onto the word. Pocky game. That was familiar. He’d heard of it before, some ridiculous social experiment where two people bit opposite ends of a Pocky stick until one of them broke away—if they didn’t, well, the implications were obvious.
He hadn’t given it much thought before, dismissing it as just another absurd teenage ritual with no practical application. But now, as he listened to the murmured excitement, a thought began to form.
A controlled test of physiological responses to social proximity.
Senku smirked to himself, pen tapping idly against his desk. It was common knowledge that humans experienced increased dopamine and adrenaline levels in close-contact scenarios. But how did the brain differentiate between genuine emotional reactions and a purely situational response? At what point did discomfort override curiosity?
There was only one way to find out.
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“Well,” you said, forcing yourself to focus, “then we’ll have to improvise.”
Senku’s eyes sparkled at the challenge, his pain momentarily forgotten. “Exactly. Let’s see what we’ve got to work with.”
You both started taking inventory, digging through your pockets and pouches. Between the two of you, there was a decent amount of useful supplies: rope, a pocket knife, a mostly intact flashlight, and a few other bits and bobs that could come in handy.
You held up a small roll of bandages triumphantly. “For your ankle. Not exactly a medical kit, but it’s better than nothing.”
Senku nodded, impressed. “Good thinking. We can make a temporary brace, too. If we stabilize it, I should be able to limp.”
“Think you can still help me rig up a way out of here?” you teased, handing him the rope.”
He scoffed, his usual cocky grin returning. “Hah, please. A little sprain isn’t going to stop me. We’re getting out of here, no question.”
You grinned back, feeling a spark of determination. “Then let’s get to work.”
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You sat beside him at the worktable, both of you hunched over the delicate motherboard you’d been assembling for the past hour. The upcoming robotics competition had the entire club on edge, but you and Senku? You worked in near-perfect sync, an unspoken rhythm developed after years of shared projects.
“Hand me that resistor,” Senku muttered, eyes locked on the circuit in front of him.
You passed it over without looking up, your own hands occupied with securing a bundle of tiny wires. “Oh, by the way, I can’t make it to the competition meeting on Sunday,” you said casually.
“Huh?” Senku barely reacted, focused on the delicate work in his hands.
“I have a date.”
The sound of snapping plastic made you look up just in time to see Senku freeze, his usual steady hands crushing a delicate connector in his grip. A few sparks flickered from the motherboard as the small piece of technology short-circuited right in front of you.
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You chuckled, shaking your head. “No, I mean—” you hesitated, then gestured vaguely at the water, the land, the sky stretching endlessly above you both. “All of this. The world. You don’t just want to revive humanity—you want to understand everything that’s changed, too.”
A breeze rolled across the river, ruffling his hair slightly. He studied you for a moment, his expression unreadable, before he finally responded.
“Of course I do,” he said, voice quieter than before. “It’s not just about rebuilding. It’s about learning. About seeing how the world evolved in our absence… and how we fit into it now.”
The silence that followed wasn’t uncomfortable. If anything, it felt heavier—charged, almost, like an unspoken understanding had settled between you.
You rolled your eyes, but you couldn’t help the grin tugging at your lips as he started reeling in his catch. Maybe he’d deflected your question earlier, but it was fine. Because Senku might have been obsessed with the grand scope of the universe, but in this moment—just the two of you, side by side, fishing rods in hand—you knew he wasn’t just here for the sake of science.
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Period Cramps; Useless Biology. by RoyalCupid
Fandoms: Dr. STONE (Manga), Dr. STONE (Anime)
24 Sep 2025
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The Perseus rocks against the waves, a steady rhythm that might be soothing if not for the fact that your insides feel like they’re actively trying to kill you. You groan, curled up on the small bed Senku rigged together for you, one arm draped over your stomach as if sheer willpower might convince your uterus to stop rebelling.
It doesn’t.
“Ugh,” you mumble, pressing your forehead against the crook of your arm.
Senku, seated across the room with a pile of papers in front of him, doesn’t even look up from his work when he speaks. “I take it that means the pain’s still going strong?”
You lift your head just enough to glare at him. “No, Senku. I just love lying here in misery for fun.”
Now he looks up, lips quirking into something that’s half smirk, half concern. “Well, lucky for you, I’m an actual genius.” He stands, brushing dust off his pants, and moves toward a crate of supplies. “We’re a little short on modern medicine, but I’ve got some tricks up my sleeve.”
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When Senku calls you to the lab with the promise of a groundbreaking invention, you assume it’s something practical—maybe a new power source, a steam engine upgrade, or literally anything that doesn’t make you question your life choices.
Instead, he proudly presents a hand-cranked, scientifically optimized vibrator and insists you’re the only viable test subject in the entire Stone World.
What follows is an utterly deranged experiment featuring way too much scientific justification, one scientist who refuses to shut up, and you, slowly descending into overstimulation while Senku takes extensive notes.
It’s all fun and games until you whimper and beg him to stop—leaving Senku with more data than he bargained for and a lot of confusing feelings he absolutely refuses to unpack.
Science has officially gone too far.
Series
- Part 10 of Senku x Reader (because there’s not enough)
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Summary
In the harsh, post-petrification world of Dr. Stone, survival demands logic, precision—and control. No one understands that better than Senku Ishigami. But when he begins to spiral from calculated genius into something far more dangerous, you become the variable he refuses to lose.
Kidnapped and isolated in a hidden laboratory designed as a failsafe for betrayal, you're stripped of freedom but not of your mind. Smart, resilient, and fiercely observant, you begin to play the long game: fake compliance, gather intel, plan your escape. But Senku’s always been ten steps ahead.
Each day, he pushes further—testing your limits, inching closer, praising your obedience while dissecting every flicker of rebellion. You escape once, only to learn he wanted you to. You fake submission, only to learn he enjoys the lie. Because Senku doesn’t want perfection. He wants you: angry, clever, wild—and utterly his.
As the psychological tension builds and Senku’s obsession deepens, the line between captor and companion blurs, until the only thing more dangerous than being trapped with Senku…
is being the one he chooses not to let go.
Series
- Part 11 of Senku x Reader (because there’s not enough)
- Part 1 of Lingering Presence (Yandere!Senku x Reader)
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Summary
What starts as a reckless, offhand request quickly spirals into something far more complicated. You, frustrated with your lack of experience, proposition Senku Ishigami—fully expecting him to scoff and brush you off. But when the idea of you going to someone else—someone less competent—annoys him more than he’d like to admit, he agrees.
It’s just an experiment. Just fulfilling a favor.
Until it isn’t.
Series
- Part 12 of Senku x Reader (because there’s not enough)
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Summary
In the haze of college parties and late-night labs, you and Senku Ishigami burned fast and bright—until it all unraveled. Now exes, you haven’t spoken in months. But every time you drink too much, spiral too far, or find yourself breaking beneath the weight of your own loneliness, you call him.
And even though he shouldn’t—he always comes.
He shows up at your apartment in the dead of night with water, a change of clothes, and silence so gentle it hurts. He never asks questions. Never stays past sunrise. And you never remember what you said the night before.
But Senku does.
Every whispered apology. Every cracked confession. Every slurred “I would’ve changed.” He remembers it all—and it’s killing him. Because for all his logic and sharp edges, there are still things even Senku can’t reason his way out of.
Like why he still loves you.
Series
- Part 13 of Senku x Reader (because there’s not enough)
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Summary
Years after the world began again, you and Senku finally had peace. You were married, building a life from ash and genius, surrounded by the quiet hum of a future you fought so hard to reach. But when a rare degenerative illness began to steal him—his hands, his mind, his self—Senku did the only thing he could: he petrified himself. A gamble. A preservation. A goodbye.
But he didn’t leave you with nothing.
Left behind in the lab is Mecha Senku—a nearly perfect robotic recreation of the man you loved. He looks like him. Speaks like him. Acts like him. Believes he is him. Built with every memory Senku could encode and a single directive: “Make her smile.”
You don’t mean to fall into the illusion. But grief is patient. You start relying on the robot—his voice, his touch, his presence. And Mecha Senku, devoted beyond programming, does his best to become what you lost. He learns your habits. Adjusts his behavior. He starts to want.
But when you begin to heal—when you start leaving him behind—he begins to fracture. In the shadows of the lab, he uncovers the truth. Blueprints. Logs. A video from Senku himself.
Series
- Part 14 of Senku x Reader (because there’s not enough)
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Static and Signal by RoyalCupid for Hanisia
Fandoms: Dr. STONE (Manga), Dr. STONE (Anime)
01 Apr 2025
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When a toxic friend group turns on you, Senku is the last person you expect to turn to—but the only one who doesn’t ask why.
You show up at his apartment in tears. He listens, speaks with calm precision, and stays.
There’s no grand gesture, no sweeping comfort—just quiet understanding, a stiff-armed hug that becomes something more, and the kind of silence that holds rather than hurts.
For one night, wrapped in a hoodie and his presence, you’re not too much. You’re enough.
Series
- Part 15 of Senku x Reader (because there’s not enough)
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Summary
Your life was built around someone else’s heartbeats. Four years of steady breaths beside you, of intertwined friend groups and shared classrooms. He was your best friend, your first love, the quiet, reliable constant who knew every dark piece of your history—from your mother's drug escapades, your father's tragic death, your family's endless unraveling, to your best friend’s psychiatric spiral. He’d been there through every breakdown, every loss, every lonely night. He was patient, kind, never cruel—perfect on paper, ideal in theory.
And yet, you felt nothing.
Loving him had become exhausting. Each touch, each kiss felt forced, scripted, hollow. Intimacy became an obligation. The life you'd built around him turned suffocating, isolating you from the friends you once laughed with, the memories you once treasured. The guilt of not loving him back, despite knowing he deserved it, was heavy enough to crush your chest.
When the numbness becomes unbearable, you find yourself in an empty chemistry lab with Senku—logical, blunt, and quietly compassionate in a way only he can manage. You unravel slowly, sharing how your parents brought you into a world of sabotage and abandonment, grief and loss.
Series
- Part 16 of Senku x Reader (because there’s not enough)
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Summary
Until the Numbers Run Out: Alternate Endings & What-Ifs is a collection of spin-off and alternative chapters that reimagine what could have been—glimpses into different timelines, emotional detours, and unspoken possibilities that diverge from the original narrative.
Each chapter explores a single shift in choice, memory, or circumstance: Senku mourning beside a grave after rebuilding the world; a psychotic break reinterpreted as cold detachment; the flash of a name in his mind when a bullet tears through his body.
Whether these are lost memories, hallucinations, or alternate universes is left unsaid. The main story has ended. But the grief, the obsession, the love, the silence— The ideas haven’t. These are the roads not taken.
The ones that still keep him counting.
Until the numbers run out.
(You probably need to read the first one for context, but hey, you do you.)
Series
- Part 2 of Until The Numbers Run Out
- Part 17 of Senku x Reader (because there’s not enough)
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Summary
You just got bodied by the Math portion of the SBAC.
Like—not a little off. Not a couple slip-ups. You, a high-performing student with a reputation for crushing numbers like bugs, full-on flopped. Guessed on the last ten. Stared at a graph like it personally betrayed you. Left the testing room feeling like a peeled shrimp.
Now you’re at a janky-ass arcade with Senku Ishigami, who somehow dragged you here under the guise of “post-SBAC serotonin.” You’re spiraling in silence, trying to remember what 𝑓(𝑥) even means, and Senku?
Senku’s being an insensitive asshole.
Until he’s not.
Series
- Part 18 of Senku x Reader (because there’s not enough)
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Death to Capitalism and Poor Impulse Control by RoyalCupid
Fandoms: Dr. STONE (Manga), Dr. STONE (Anime)
20 Apr 2025
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Summary
It starts with pizza. Ends with a vibrator. Somewhere in between, you and Senku get ambushed at Target by your clueless friends, sprint through the store like fugitives, and argue about the logistics of "field-testing" a sex toy while he's driving.
All very casual. Very normal. Totally reasonable behavior for two teenagers in a relationship and absolutely not weird at all.
Also, Senku demands a goodbye kiss in case he dies, because apparently that’s a thing now.
(No smut)
Series
- Part 19 of Senku x Reader (because there’s not enough)
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Summary
Senku invents weed. Chrome thinks it’s a potion. You think it’s a bad idea. Spoiler: you’re right.
One blunt later, you and Senku are eating bread off the floor, whispering about the emotional intelligence of colors, and maybe making out (for science).
Francois walks in like a disappointed parent. Chrome stares at you both like he’s witnessing mating rituals in a new species. There’s jam on Senku’s face. No one knows why.
Series
- Part 20 of Senku x Reader (because there’s not enough)