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Between Unspoken Words

Summary:

After a brutal battle leaves (Y/N) injured, the village struggles to regain its rhythm while Senku quietly watches over her recovery. Though she insists on pushing herself, he sees through every small strain, using rare, deliberate ways to make her listen—words that carry more weight than either of them admits. What begins as calculated “efficiency” turns complicated when (Y/N) accidentally mirrors it, and exposes a rarer side of Senku that she’s never seen before. The slip shifts something between them. Teasing turns into awareness, logic into quiet vulnerability. As they navigate healing, both physical and emotional, they agree to keep these words—and what they imply—private. In the stillness of shared space, their connection deepens not through grand gestures, but through small, intentional moments that belong only to them.

Notes:

Welcome to the sixteenth story in my Ishigami Senkuu x Reader series! I hope you enjoy this one!

(See the end of the work for more notes.)

Work Text:

A Word That Doesn't Belong

The village had settled into something quieter after the chaos of battle—not peace, not truly, but a steadier rhythm that no longer felt like it might fracture under the slightest pressure. The elders were glad that the Science Team had returned safely, with the exclusion of (Y/N). 

There were still scars. In the land, in the people, in the way everyone moved just a little more carefully than before.

You were no exception.

The bandages wrapped tightly around your side had become a constant presence, a subtle but persistent reminder of Hyoga's blade and the thin margin between survival and loss. Even now, days later, every movement carried consequence; every shift of your weight was calculated whether you meant it to be or not.

And yet—

You were outside the lab anyway.

Seated on a low wooden crate, a basket of dried herbs resting beside you, sunlight filtering through the canopy above in soft, fractured patterns, you worked with deliberate care, sorting stems from leaves, separating what could be used from what needed to be discarded.

It was simple work.

Safe work.

Work that you could do without drawing attention to the fact that every breath still pulled faintly against your ribs. Which was exactly why you had chosen it.

"You're favoring your left side again."

Senku didn't look up from the glass beaker in his hand when he said it, his tone casual—too casual—like he was commenting on the weather rather than dissecting your every movement with quiet precision.

You didn't even pause, hands continuing their work as you refused to look at him. 

"I'm not."

"You are." He shot back at you, glancing briefly before going back to the beaker in his hand. 

"I'm not." You insisted, hands stilling slightly. 

"You've shifted your weight three times in the last minute." Senku stated. Like it was nothing. 

That did make you hesitate.

Only briefly—but long enough to give you away.

"...You count that?" you asked, glancing toward him despite yourself.

"Obviously."

There was something deeply unfair about the way he could notice everything without ever appearing like he was trying. His attention seemed effortless, like breathing—constant, unrelenting, and impossible to ignore once you realized it was there.

You studied him for a moment.

The familiar sharp focus in his eyes, the steady movements of his hands as he adjusted the angle of the beaker to catch the light just right, the faint crease between his brows that only appeared when he was thinking three steps ahead of everyone else—

"You're supposed to be resting," he added.

You snorted softly, returning your attention to the herbs in your lap. "And you're supposed to be sleeping more than two hours a night."

"That is not relevant to the conversation that we are having."

"Hypocrite." You teased, lips curling in a small smile. 

That earned you the faintest twitch at the corner of his mouth.

Not quite a smile.

But close enough for you. 

Silence settled between you again—not empty, not strained, but something softer, something easier than it used to be. The kind of quiet that didn't demand to be filled, that simply existed around you like a shared understanding neither of you needed to define.

It had become like that lately.

After everything.

After the battle.

After you had almost—

You pushed the thought away before it could fully form.

Instead, you reached for another bundle of herbs, shifting slightly to ease the growing stiffness in your side—

—and immediately regretted it.

A sharp pull flared beneath the bandages, sudden and biting enough to steal the breath from your lungs before you could stop it.

Your fingers tightened instinctively. Your shoulders tensed and your breath hitched.

Just the slightest bit. A small inhale as the pain flared bright. 

But not small enough.

Senku's hand stilled from where he was still messing with the beaker. 

He didn't look at you right away.

But when he did, the shift was immediate—sharp, assessing, cutting straight through the space between you with quiet certainty.

"You're done for today."

You exhaled slowly, forcing your shoulders to relax as you reached for another stem like nothing had happened.

"I'm fine."

"You're not."

"I said—"

"Sweetheart."

The word didn't startle you.

Not in the way it might have once.

Because this wasn't the first time.

Rare—ridiculously rare—but not unfamiliar.

And that made it worse.

Because you knew exactly what it meant when he used it.

Your hand stilled mid-motion anyway, more out of reflex than surprise. Then slowly—deliberately—you lifted your gaze to him.

"...You're doing that on purpose."

There was no immediate response.

Senku turned the beaker slightly, watching the liquid inside settle before setting it down with precise care, like he hadn't just deployed one of his most effective weapons without hesitation.

"I don't know what you're talking about."

"Oh, don't even try that," you shot back, setting the herbs aside as you shifted your weight—carefully this time—so you could face him properly. "You only use that when you want something."

"I always want something."

"You know what I mean."

He glanced at you then, one brow lifting slightly.

"Do I?"

You narrowed your eyes.

"...You're using it to get me to stop working."

"That's not inaccurate."

"And you know it works."

"That is also not inaccurate."

You stared at him for a moment, searching his expression for even a hint of guilt and found absolutely none. 

If anything, there was the faintest trace of amusement there, subtle but unmistakable.

Your lips pressed together, trying—and failing—to suppress the warmth creeping up your face.

"That's manipulative." You accused of him, pointing a finger in his direction and wagging it. 

"It's efficient." He shot back, hands stretching above his shoulder like this conversation was just another day for you both. 

"It's unfair."

"It's effective."

"That doesn't make it better."

"No, maybe not. But it makes it successful."

You huffed, crossing your arms loosely over your chest before immediately regretting it as the motion pulled at your side again.

Senku noticed.

Of course he did.

"You just proved my point."

"I did not."

"You did."

"I didn't—"

"Sweetheart."

You froze.

Again.

And this time, you could feel it—clear as anything—the way your pulse jumped, the way your thoughts stuttered just enough to interrupt whatever argument you'd been about to make.

You hated that it worked. You really hated that it worked.

And judging by the way his gaze sharpened slightly, he knew it too.

"You're impossible," you muttered, looking away first.

"And yet, I am still correct."

You scoffed softly, shaking your head.

"...You're unbelievable."

"And you're still pushing yourself past your limits."

"I'm sitting."

"Yes. But clearly that is putting to much strain on your side."

"I'm sorting herbs."

"You're avoiding rest like you know you should be taking. Both Ruri and I said you could help around the village as long as your careful and take breaks when you need them."

You opened your mouth to argue—

—and stopped.

Because he wasn't wrong.

That didn't mean you were going to admit it.

"...You're using pet names as leverage," you said instead, quieter now, more thoughtful than accusatory.

His head tilted slightly.

"You don't just say things like that," you continued, your gaze flicking back to him. "Not unless you're trying to get a reaction."

"And?"

"And you are trying to get a reaction."

A pause.

Then—

"...Obviously."

You blinked.

"...You're not even going to deny it?"

"No."

"Wow."

"I'm a scientist. Are you really surprised that I would use all available resources at my disposal?"

"That's not what that means."

"It does in this context."

You stared at him, caught somewhere between exasperation and something warmer you didn't want to name.

"...So you admit it," you said slowly. "You're using pet names as a strategy."

"Correct."

"To make me listen to you."

"Yes."

"That's—" You let out a breath, shaking your head. "That's ridiculous."

"It's working."

You hesitated.

"...That's not the point."

"That is exactly the point."

You opened your mouth again—

—and closed it.

Because he was right.

Again.

And the worst part was—

He knew it.

"You're insufferable," you muttered.

"And you're still not resting."

"...You're really going to keep doing that, aren't you?"

"Until you stop ignoring your own recovery? Yes."

And when he turned back to his work like nothing had happened—

You sat there, heart still racing, entirely too aware of the word that lingered between you.

 

A Slip of the Tongue

You told yourself you wouldn't think about it.

You had, very deliberately, made that decision the night before—lying awake longer than you should have, staring up at the faint outline of the tent ceiling while the village slept quietly around you, your thoughts circling back to a single, inconvenient detail you refused to name outright. Senku fast asleep next to you.

It was just a word.

That's what you told yourself.

Just a word. A sound. A combination of syllables that held no inherent meaning beyond what people chose to assign to it.

And in this case—

It was just Senku being... Senku.

Blunt. Tactical. Unapologetically efficient.

Using whatever tools he had available to get the result he wanted.

That's all it was.

That's all it should have been.

But the problem was—

It wasn't.

Because you knew him.

Because you had spent enough time around him to understand the patterns in his behavior, the careful way he chose his words, the rare moments when something slipped through that wasn't strictly necessary for the situation at hand.

He didn't waste language.

He didn't indulge in it.

Which meant when he did something like that—

When he said something like that—

It stuck. It lingered. It replayed itself in the quiet moments when you weren't actively distracting yourself.

And no matter how many times you told yourself it didn't matter—

It stayed with you longer than you wanted to admit.

So by the time you were back in the lab a few days later, seated across from him with a small mortar and pestle in hand, carefully grinding minerals into a fine powder for one of his latest experiments, your thoughts were... unfocused.

Not enough to make a mistake or to compromise the work you were helping him with.

But enough that your rhythm wasn't quite right.

Enough that your attention drifted just slightly out of alignment.

Which, of course—

He noticed immediately.

"You're spacing out." He called out to you, glancing at you from the corner of his vision. 

"I'm not."

"You stopped grinding the pestle."

You blinked and looked down at your hands. 

You had.

The pestle rested motionless in your hand, the partially crushed shells sitting unevenly in the bowl like evidence you couldn't argue your way out of.

"...I'm thinking," you said, resuming the motion with a bit more force than necessary.

"That's dangerous."

"Oh, shut up."

Senku smirked faintly, not looking up from the notes he was scribbling, the charcoal in his grasp moving in quick, precise strokes across the paper like his hand couldn't keep up with the speed of his thoughts.

The normalcy of it helped.

More than you wanted to admit.

There was something grounding about being here—about the steady rhythm of work, the familiar scent of chemicals and stone and parchment, the quiet scratch of pen against paper mixing with the soft grind of minerals beneath your hands.

It was predictable.

Structured.

Safe.

You adjusted your grip slightly, focusing on the texture beneath the pestle, the resistance gradually giving way as the mineral broke down into finer particles.

Trying to focus.

Trying not to think about—

"Can you hand me the bottle with the sulfur in it next to you?."

You didn't look up.

"Sure Honey."

The word slipped out before your brain could catch it.

Before you could stop it.

Before you could realize what you were saying.

And the moment it left your mouth—

You froze. The pestle stopped mid-motion and your breath caught.

And the world seemed to go unnaturally, unbearably still.

Silence didn't just settle—it dropped.

Heavy and immediate.

Like something had shifted in the air between you that neither of you could ignore.

Senku didn't move.

Not at first.

Not even a flicker of motion.

Then, slowly—

"...What did you just call me?"

Your entire body heated all at once, the warmth rising too fast, too sharp to control.

"I—didn't—"

"You did."

There was no hesitation in his voice.

No uncertainty.

Just quiet, absolute certainty.

You refused to look at him.

Focused instead on the bowl in front of you like it might somehow swallow you whole if you stared at it hard enough.

"...It slipped."

"'Honey' slipped."

"...Yes."

There was a pause.

Longer than it should have been.

Long enough that your heartbeat became painfully loud in your own ears.

Long enough that you could feel the weight of his attention without even looking at him.

You swallowed.

Then, against your better judgment—

You glanced up.

And immediately wished you hadn't.

Because Senku Ishigami—

Was red.

Not just slightly flushed.

Not something you could explain away with lighting or temperature or anything remotely logical.

No—

He was actually, undeniably red.

The color spread across his cheeks in a way you had never seen before, sharp against the usual composure he carried.

It was so unexpected—

So completely out of character—

That it stunned you for half a second before your brain caught up.

"...You're blushing," you said, the words slipping out before you could stop them.

"I'm not."

"You are."

"I'm not."

"You absolutely—"

"I said I'm not."

Which might have worked.

If he wasn't very deliberately avoiding eye contact now.

If his hands hadn't stopped moving entirely.

If his posture wasn't just slightly more rigid than usual, like he was trying very hard to pretend nothing had happened.

You stared at him.

Really stared.

Trying to reconcile the version of him you knew—the unshakable, unbothered, hyper-logical scientist—with the very real, very human reaction sitting right in front of you.

And then—

Because you had absolutely no self-preservation instinct in moments like this—

"...Honey."

That did it.

His charcoal snapped.

Just a quiet, sharp crack between his fingers that sounded impossibly loud in the silence.

"...Don't call me that."

You bit your lip.

'Too late.' Y

The smile had already started.

"Oh, so now it's a problem?"

"It's inefficient."

"That's the excuse you're going with?"

"Yes."

You leaned forward slightly, resting your chin in your hand, studying him with open curiosity now, the earlier embarrassment beginning to shift into something lighter.

Something teasing.

"I think you're embarrassed."

"I'm not embarrassed."

"You're red."

"It's the lighting."

"There's no fire in here."

"Sunlight."

"We're inside the lab."

"...Tch."

You laughed.

Soft and uncontrolled.

A soft sound that slipped out before you could contain it, and something about it—something about the ease of it—seemed to shift the tension just slightly.

Not gone.

But... less sharp.

Less fragile.

Senku exhaled quietly, setting the broken pen aside with more care than it deserved before reaching for another one, though he didn't immediately resume writing.

"...It caught me off guard," he admitted finally, his voice lower now, less defensive.

You blinked.

The shift surprised you more than anything else had.

"...Oh."

"That's all."

"That's not all."

"It is."

"You broke your charcoal."

"Clearly, it was a weak piece of charcoal and I wouldn't needed another soon anyways"

"You snapped it in half."

"It failed under pressure."

You tilted your head slightly, watching him.

"...You're unbelievable."

"And yet, I am correct."

You shook your head, a faint smile lingering despite yourself.

The warmth in your chest hadn't gone away.

If anything, it had settled deeper.

Quieter.

"...So you don't like it?" you asked after a moment, your voice softer now, less teasing.

That made him pause.

No a deflection.

No immediate response.

A real pause, like he was taking time to think about your question.

His hands hovered over the paper, unmoving.

"...I didn't say that."

Your heart did something inconvenient.

"...Then, why?"

He exhaled slowly, his gaze dropping briefly before shifting back toward you, steadier this time.

"...It's not something I want broadcast to the entire village."

And there it was.

The logic.

The reasoning.

The part of him that always grounded everything in practicality.

But underneath that—

You could hear it.

The real meaning.

And it made something in your chest tighten in a way that had nothing to do with your injury.

Ah.

"...Yeah," you murmured, the corner of your mouth lifting slightly. "That tracks."

Because you could already imagine it.

Gen's voice, light and teasing, dragging it out endlessly.

Chrome's wide-eyed reaction, loud and entirely unfiltered.

The entire village catching onto it within minutes.

"...So it's a secret?" you asked, quieter now.

His eyes flicked to yours.

There was no hesitation this time.

"...No. Just something for us."

And the way he said it—

Simple.

Certain.

Like it wasn't even a question—

It settled something inside you.

Not loudly.

Not dramatically.

Just... gently.

You nodded once, almost to yourself.

"...Okay."

Silence followed.

But it wasn't the same silence as before.

It wasn't heavy.

Wasn't awkward.

It felt... shared.

You reached for the sulfur this time, actually handing it to him without incident, your fingers brushing briefly against his as you passed it over.

The contact was fleeting.

Barely there.

But neither of you pulled away immediately.

Just—

A second longer than necessary.

And he took the sulfur, turning back to his work like nothing had happened.

 

Quiet Things, Said Softly

The tent was quieter than the rest of the village.

It always had been.

Not because it was far—if anything, it sat just beside the lab, close enough that the sounds of work still drifted through at all hours—but because of what it held. The space itself had changed over time, shaped less by structure and more by presence, by the routines that had settled into it, by the quiet understanding that this was where things slowed down whether you intended them to or not.

Here, the sharp edges softened.

The urgency faded.

Even the constant hum of progress—the relentless forward motion that defined everything Senku touched—seemed to lower its voice just slightly at the threshold.

It smelled faintly of parchment and chemicals, the residue of long nights spent working too close to where you were meant to rest, but beneath that was something warmer—faint traces of dried herbs, clean linen, the subtle familiarity of shared space.

It was yours.

Not in ownership or words or land deeds.

But in the way it had been used, in the way it had been lived in, in the way both of you existed within it without question.

You sat on the edge of your makeshift bedding, the fabric worn just enough to be comfortable beneath your fingers as you carefully adjusted the bandages wrapped around your side. The motion had become familiar over the past days—methodical, practiced—but no less frustrating.

The wound had begun to heal.

You could feel it.

The sharpness had dulled, the ache settling into something more manageable, more distant—but it still lingered, still reminded you with every careless movement that you weren't quite back to yourself yet.

Which meant—

You had to be careful.

Even if you didn't want to be.

You tightened the last wrap, exhaling slowly as you tested the tension, adjusting it slightly when it pulled too much against your ribs.

The tent flap shifted.

You didn't look up.

"You were out late."

The words came easily, almost automatic, your focus still on the bandage beneath your hands.

There was a brief pause.

Then—

"I had to finish stabilizing a reaction."

Of course he did.

You huffed softly under your breath, the faintest hint of a smile pulling at your lips despite yourself.

"Of course you did."

Footsteps moved closer, quiet but deliberate, and you could feel his presence settle beside you before you actually looked up.

Senku crouched near the edge of your bedding, setting a small bundle of supplies down within easy reach—clean cloth, fresh wraps, a small container of salve you recognized immediately.

"Let me see."

It wasn't a request.

It never was.

But there was no sharpness to it, no edge of command—just quiet certainty, the same tone he used when stating a fact that didn't need to be argued.

And for once—

You didn't.

Carefully, you shifted slightly, easing your hands away as you allowed him to take over, the movement instinctive now in a way that might have surprised you if you stopped to think about it too long.

His fingers brushed against your side as he worked.

Precise and controlled.

But gentler than anyone else would have expected.

That was something you had learned quickly—something most people never noticed.

Senku was careful.

Not in the obvious ways.

Not in the ways people associated with softness.

But in the way he handled fragile things.

The way he adjusted his grip just slightly to avoid pressure.

In the way he accounted for variables no one else even thought to consider.

You watched him for a moment, the focused set of his expression, the faint crease between his brows as he examined the healing wound like it was a problem to be solved.

Silence stretched between you.

Never uncomfortable anymore.

Just... thoughtful.

The kind of quiet that held more than it said.

Your fingers curled slightly against the fabric beneath you.

"...You meant it earlier, didn't you?"

His hands paused.

Just briefly.

"...What?"

"That you wanted it to be just for us."

The word lingered in the air between you, soft but deliberate, carrying more weight than its simplicity suggested.

There was a small shift in his posture—not enough to be obvious, but enough that you felt it where you sat.

Then—

"...Yeah."

No deflection.

No dismissal.

Just a straightforward answer.

You watched him for a moment, studying the way he resumed his work, the careful precision returning to his movements like nothing had interrupted them at all.

"...You really care what they think?"

"Not what they think," he corrected, his voice steady. "What they do or would do."

You smiled faintly, the answer exactly what you expected.

"Tease you?"

"Endlessly."

"Gen would never let it go."

"Exactly."

There was something almost... resigned in the way he said it, like he had already run the scenario through his head and determined the outcome with absolute certainty.

You couldn't help it—you laughed softly, the sound light in the quiet space.

Then, after a moment—

Quieter.

More intentional.

"...I don't mind it being ours."

His hands stilled again.

This time, not just for a fraction of a second.

Long enough that you noticed.

Long enough that the air shifted, just slightly, around the words.

"...Yeah?"

It was subtle.

The question.

But it was there.

And for someone like him—

That mattered.

"Yeah."

You meant it.

Something that didn't belong to the rest of the village, to the noise, to the teasing, to the constant presence of others.

Something small and yours.

You hesitated for just a moment after that.

Not out of uncertainty—

But because you were choosing it.

Then—

"...Honey."

The word felt different this time.

it wasn't said mindlessly.

Not something pulled out of you without thought.

It was intentional.

Soft in a way that you usually weren't with Senku.

But it wasn't teasing or challenging the boundaries he had expressed. Just testing this new change between you two. 

His gaze flicked up to yours.

Just a quiet stillness that settled between you, stretching just long enough to make your pulse shift, just enough to make the moment feel real in a way that surprised you.

"...You're doing that on purpose now."

His voice was quieter than before.

Less guarded.

"Maybe."

You didn't deny it.

Didn't need to.

"...Tch."

But there was no bite to it.

No irritation.

Just the faintest hint of something you couldn't quite name.

You tilted your head slightly, watching him, the way he held your gaze just a second longer than usual before looking back down at your side.

"...Do you hate it?"

"No."

The answer came easily.

Too easily to question.

"...Do you like it?"

This time—

He paused.

Really paused.

Not because he didn't have an answer.

But because he was choosing whether or not to say it.

And that—

That mattered more than anything else.

Then—

"...Yeah."

It was quiet.

Honest.

Unfiltered in a way that didn't match his usual tendency to wrap everything in logic.

He exhaled slowly, something in his expression easing, the tension that had lingered earlier loosening in a way that was almost imperceptible if you weren't paying attention.

But you were.

"...Just don't say it in front of Chrome."

You laughed.

Soft and immediate.

"Deal."

"...And definitely not Gen."

"Absolutely not Gen."

"Good."

The word was quiet.

Something in his voice said he was satisfied.

Like a condition had been met.

Silence settled again.

But it felt different now.

Closer.

Warmer.

Not because anything had changed dramatically.

No shift in dynamic that anyone else would notice.

If someone walked in right now they wouldn't see anything different. Just the same two people in the same space the both of you had been occupying for several months now. All they would see is Senku helping you with wound care. Something that everyone in the village had already seen. 

Senku adjusted the bandage one last time, his fingers brushing lightly against your side as he secured it, checking the tension with the same careful precision as before.

"Don't push it tomorrow."

You huffed softly.

"I wasn't planning to."

"That's not convincing."

"I mean it."

"You said that last time."

"And I mostly listened."

"You argued with me for twenty minutes."

"I still rested."

"...Eventually."

You smiled faintly, leaning back slightly as he finished, careful of the pressure against your side.

"That still counts."

"...Barely."

You watched him for a moment as he gathered the supplies, his movements efficient but unhurried, like there was no immediate need to move on to the next task.

Like he was—

Staying.

"...You're not going back to the lab?" you asked.

"Not immediately."

That was new.

You raised a brow slightly.

"...Everything okay?"

"Yes."

"...No disasters?"

"None."

"...No reactions about to explode?"

"Nope."

"...No urgent need for you to be somewhere else?"

He glanced at you.

"...No."

You held his gaze for a second longer than necessary.

"...Huh."

"...What."

"Nothing. That's just unusual at this time of day."

You shifted slightly, settling more comfortably against the bedding, the tension in your side easing now that the bandage had been properly adjusted.

"...You're staying."

"I said I'm not going back yet."

"That's not the same thing."

"It is in this context."

You smiled faintly.

"...Sure it is."

He didn't argue.

Didn't correct you.

Just sat there, the space between you filled with something quiet and steady that didn't need to be defined.

Your fingers traced absent patterns against the fabric beside you, your thoughts slower now, calmer than they had been earlier.

"...Thanks for helping me Honey."

You said it again.

Soft but intentional.

His gaze flicked to yours.

"...Sure thing Sweetheart."

You smiled, just slightly as your face warmed at his words. 

Notes:

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