Fire Beneath the Earth - Imagine Zuko x Earthbender! Reader, Part I
Synopsis/Request: I liked the dynamic between Zuko and Kyoshi, an earthbender; they remind me of a princess x knight vibe with genders swapped. I'd love another story about them, please?? Her discovering she's a lavabender (I find that sub-bending very incredible).
The ship moved through the dark sea with the steadiness of a blade slicing through fabric. Its prow cut through the deep waves in clean motions, leaving behind white trails that vanished almost the moment they were born. The late afternoon slowly dissolved across the horizon, staining the sky with burnt copper, ancient red, and violet shadows scattered between the clouds. It was a severe kind of beauty — the kind that did not invite admiration, only respect.
The wind blew damp and cold from the ocean, yet beneath the salt it carried something unexpected: the dry scent of old ashes, heated stone, and distant sulfur. As if the island, still many minutes away, was already announcing its presence before it could even be reached.
Ahead, Roku Island emerged through the sea mist like a memory made flesh. Dark, jagged against the blazing sky, with the volcano rising at its center like a sleeping sentinel. Motionless only to those who did not know how to listen. Because even from afar, there was a silent threat within it — a promise of restrained power.
Zuko stood alone at the bow.
Arms crossed, posture rigid, his weight distributed perfectly to withstand the rocking of the ship without even thinking about it. It was the kind of balance born from years in combat, years on the run, years spent living as though the world might demand a reaction at any moment.
His red cloak snapped behind him in sharp bursts of wind. The dying light of dusk carved shadows across his face and deepened the mark of his scar even further. Whenever he thought too much, his expression hardened like that — as if his mind pulled every muscle inward.
And he was thinking too much.
About the council he had left behind in the capital.
About the problems waiting for him upon his return.
About peace, which demanded more effort than any war.
The sound of your footsteps came behind him across the deck.
Neither hurried nor hesitant.
The footsteps of someone who never asks for space before entering it.
Zuko did not turn around.
You walked the way you fought: with precision. Every movement seemed simple until truly observed — then it revealed absolute control. Shoulders aligned, chin lifted, spine straight, center of gravity always steady. The green and gold paints of your Kyoshi armor emphasized your presence rather than softening it.
There was no crown on your head, no title accompanying you on that ship.
And yet there was something about you that resembled royalty more than many nobles could ever hope to convey.
Elegance built through discipline.
The kind of presence that never needs to announce itself.
You stopped beside him, turning your eyes toward the island.
For a few seconds, only the sea spoke between you.
Then Zuko broke the silence without looking at you.
“You’ve been staring at me for five minutes.”
Your answer came immediately, smooth as polished stone.
He let out a low sound, almost an irritated sigh.
“I’m glad to exceed expectations.”
You crossed your arms, mirroring his posture — fully aware of it, and choosing to do it anyway.
Your eyes traveled to the distant volcano.
“Do you always get this dramatic near burning mountains... or is that reserved for special occasions?”
Zuko turned his head just enough to glance at you.
“Only near irritating people.”
You nodded with false solemnity.
“Then today you’re surrounded by danger on all sides.”
The corner of his mouth almost lifted.
A minimal movement, nearly invisible.
You saw when he tried to hide exhaustion behind rigid posture.
You saw when anger was only poorly translated concern.
You saw when silence meant internal war.
And especially, you saw when he was about to smile and abandoned it at the last second out of sheer pride.
On the outside, you seemed carved from polished stone. Cold at the surface. Steady. Impeccable. Everything about your body suggested discipline and restraint.
Inside, however, there were geological faults no one could see.
Affections compressed until they became too dense to touch.
Heat kept hidden for so long that you no longer knew whether it could ever escape without destroying something.
Maybe that was why Zuko irritated you so much.
He had the terrible, insufferable, and dangerously rare habit of noticing cracks.
Even when you had spent your entire life trying to hide them.
You looked away toward the horizon.
“There’s still time to order the captain to turn this ship around.”
“You were the one who insisted on coming.”
“I insisted on leaving the capital.”
You paused, watching the thin smoke rising from the top of the volcano.
“There’s a difference between seeking rest and agreeing to spend days on an island haunted by memories of dead Avatars.”
You turned your face toward him slowly.
Slow enough for the gesture to seem deliberate. Fast enough for him to understand the warning.
Your eyes met his without wavering.
“Are you trying to provoke me, Fire Lord?”
The way you used the title made it sound like an insult and a flirtation at the same time.
The wind passed between you, tugging loose strands of your hair and throwing the hem of his cloak backward. The ship groaned beneath your feet. The sea struck against the hull.
You held his gaze for too long to be casual.
The kind of second that stretches.
That asks for a decision.
Then you answered, voice lower:
Zuko felt his chest tighten in a profoundly inconvenient way.
Before he could reply, a shout came from the stern announcing the approach to the makeshift dock.
Ropes were prepared. Men ran across the deck. The captain barked orders.
The island now filled the entire horizon.
Black stone. Thick vegetation. Steam escaping from natural cracks in the earth. The volcano watching everything from above as if it already knew exactly who was arriving.
You stepped forward first.
“If there are hostile spirits here,” you said, adjusting one of your war fans at your belt, “I sincerely hope they choose you.”
Zuko uncrossed his arms and followed.
“If there are intelligent spirits, they’ll ignore both of us and run from you.”
“Stubbornness suits you.”
This time without hiding it.
“Then we’re dressed appropriately.”
The ship docked moments later.
And when the wood touched the stone pier of Roku Island, both of you felt the same thing — though neither of you would admit it.
As if something ancient, buried, and awakened by your presence had just opened its eyes.
The landing plank lowered slowly until it met the volcanic stone of the dock with a dry, heavy impact. The sound reverberated through the small cove in a strange way, as if the island itself had swallowed it and returned it in fractured echoes. For a brief instant, everything seemed suspended: the groaning ropes, the waves striking the hull, the hurried footsteps of the sailors. Even the sea, restless by nature, seemed to hold its movement before that dark shore.
Roku Island did not welcome visitors with warmth.
It welcomed them with presence.
The rock formations rose around the cove like natural walls, black and uneven, marked by centuries of heat and erosion. Between the stones, vegetation grew thick and stubborn, roots breaking through impossible cracks, broad leaves clinging to the rough ground as if defying fire itself. Higher above, nearly dominating the entire landscape, the volcano watched in silence.
A thin line of smoke rose from the summit and disappeared into the darkening sky.
Zuko was the first to disembark.
His boots touched the stone surface with controlled firmness, and he did not move forward immediately. He paused at the end of the plank for only a second, eyes sweeping across the terrain in one quick, precise motion.
Distance to the tree line.
Some people lost old habits when the war ended.
Others merely refined them.
The wind pulled the hem of his red cloak behind him as he moved forward a few steps, feeling the subtle heat rising through the soles of his boots. It was not intense. Not yet. But it was there, constant and quiet, like a fever the body learns to hide.
Behind him came the sound of your footsteps descending the plank.
You did not accept the sailor’s offered hand before he had even finished the gesture.
Polite enough not to be a direct insult. Sharp enough to make the man withdraw his hand instantly and decide, in the depths of his soul, never to repeat the attempt again.
You descended alone, posture impeccable despite the shifting wood. The plates of your Kyoshi armor moved with practiced restraint, making no unnecessary sound. Your face held the calm of someone who mastered their own body so completely that any ground became an extension of it.
Zuko watched the scene from the corner of his eye.
“Charming as ever,” he remarked, making no effort to hide the dryness in his voice.
You adjusted the wrap at your wrist, as though the comment deserved less attention than dust.
“And he still left unharmed. Clearly, I’m maturing.”
“The kingdom appreciates this historic progress.”
“Don’t thank me too early.”
You passed him without asking permission and walked several steps toward the edge of the black stone dock.
Your fingers touched the ground with almost reverent care.
From the outside, the gesture seemed simple. To any inattentive observer, it would have looked like an earthbender testing unfamiliar ground.
But for you, it was listening.
Your palm rested fully against the warmed stone.
The world reorganized itself.
The vibrations of sailors running across the deck came first: quick, light, disordered. The dragging of heavy crates created short, repetitive pulses. The waves striking the base of the dock throbbed in natural, cyclical, familiar intervals.
And beneath all of that...
A movement too slow for eyes, too heavy for words.
Like a colossal animal sleeping beneath layer after layer of stone.
You opened your eyes slowly.
You rose without hurry and lifted your chin toward the volcano.
For a moment, only the wind replied.
Zuko looked at the dark summit, then at you, then back to the volcano.
“You know saying things like that in that tone does not help at all.”
“I’m not trying to help.”
Even so, his gaze lingered on the mountain’s peak longer than he would have liked to admit.
A thin column of steam escaped from the side, winding upward into the newborn night sky.
The captain approached soon after, holding his hat in weathered hands. The man had crossed storm seas and faced pirates, yet at that moment he looked as uncomfortable as a recruit before two generals.
“Fire Lord,” he said, bowing his head. “We’ll finish unloading the supplies and return to deeper waters. If you wish, I’ll leave two men to keep watch at the dock until dawn.”
“Do that. And keep everyone away from the northern slope. If you feel any stronger tremor—”
“Run with absolutely no dignity,” you finished calmly.
The captain blinked, caught in the middle of the sentence.
“Honestly, it’s an excellent strategy.”
The man decided silence was his greatest skill and retreated immediately.
Zuko exhaled through his nose, somewhere between irritation and restrained laughter.
“You take genuine pleasure in frightening people.”
“I don’t frighten people.”
You began walking toward the trail that climbed the coast.
“I reveal emotional limitations. The reaction varies.”
“That is a terrible sentence.”
The path narrowed between black rocks and low vegetation. The air grew warmer with every step, thick with the mineral scent of sulfur and damp earth. Thin threads of steam escaped from cracks in the ground, creating mist around your ankles.
Above you, the sky was already sinking into the dark blue of night.
“Sometimes I forget why I keep bringing you with me,” Zuko said.
“Because I’m smarter than half your council.”
“That is a low standard.”
“Because I’m pleasant company?”
He let out a short laugh.
“Now we know volcanic activity affects your judgment.”
You stopped several natural steps above him and looked back over your shoulder.
The wind carried light ash from the mountain, catching in the dark strands of your hair before disappearing.
Zuko held your gaze for far too long.
When he answered, his voice came low and unarmored.
“Because when you’re not nearby... everything gets too quiet.”
No sudden gesture. No obvious expression.
But he saw the slight delay in your breathing. The nearly imperceptible tension in your fingers near the fan at your belt. The way your eyes shifted away for a second before returning to his.
“That was dangerously honest, Fire Lord.”
You turned and continued climbing before your face revealed more than you wished.
They walked in silence for several minutes.
Not the uncomfortable silence of people who do not know what to say.
The kind that settles when two people listen too closely to each other.
The trail wound through ancient stone before opening onto a natural rise. From there, the ruins of Roku’s old sanctuary finally appeared ahead: broken columns, cracked stairways, stone blocks partially swallowed by roots and moss.
Memory surrounded by living force.
You stopped so suddenly that Zuko halted as well.
Shoulders stiffened. Attention narrowed. Breathing grew shallow.
You did not answer immediately.
Your feet felt something beneath the foundations.
When you spoke, your voice was low enough to nearly vanish into the wind.
“The mountain isn’t sleeping anymore.”
Then, from the depths of the volcano, came a deep and prolonged sound.
It was not exactly a roar.
It sounded like something immense, ancient, and contained for far too long finally beginning to move.
The sound moved through the entire island like an invisible wave.
It did not come loud at first, nor explosive like the sudden rupture of an eruption. It began deep below, low and dragging, so deep that the body recognized it before the ears did. The vibration rose through layers of rock, passed through ancient foundations, traveled across broken steps and cracked columns, reaching you through the soles of your boots and your bones.
The stone beneath your feet trembled.
The ruins answered with a chorus of small, uneasy noises: sand slipping through crevices, fragments breaking loose, old beams groaning, chips of stone rolling down the stairs in dry clicks. A thin cloud of dust drifted from the top of a broken archway and hung in the air for a moment before being carried away by the hot wind.
After that, everything fell silent.
Not the ordinary silence that follows the end of a noise.
A different kind of stillness.
A pause heavy with intention.
As if the entire island had held its breath.
Zuko reacted before forming a single thought.
His body moved on pure instinct: one quick step forward, another to the side, drawing closer to you while positioning himself between the more open section of the ruins and the retreat path. His eyes swept the terrain with trained speed.
Height of the remaining walls.
Possible escape routes if the hillside gave way.
Years of war turned certain reflexes into second nature.
“Tell me that falls under the category of ‘normal volcano noise,’” he said, keeping his voice steady, though tension had hardened every syllable.
You did not answer immediately.
Feet planted on the black ground, eyes closed, face tilted slightly downward as if listening to an underground conversation only you could hear.
A strand of your hair moved in the hot wind blowing from the mountain. The rest of you stayed motionless.
When you finally spoke, your voice was far too calm to be reassuring.
Zuko let out a short, humorless breath.
“Excellent. Always good to eliminate positive theories early.”
Another tremor ran through the slope, shorter this time but more concentrated. The ground vibrated as if something heavy had shifted beneath the surface. A narrow crack opened several yards below, cutting diagonally across the trail. The stone split with a dry snap, and white steam burst from the fresh fissure in uneven jets.
Something in them had changed now.
And an unsettling gleam Zuko had already learned to associate with two possibilities: imminent danger or excessive curiosity in the face of imminent danger.
“It isn’t just internal pressure,” you said.
You turned slowly toward the main structure of the ruins. The old sanctuary stood ahead in broken silhouette: shattered stairways, uneven platforms, columns toppled by time and fire.
“Something is shifting the stone beneath the foundations.”
Zuko frowned immediately.
‘Something’ as in animal?”
You stepped closer to a cracked column and placed your fingertips against the darkened surface.
“Something as in structure. Mass. Ancient movement.”
“You somehow sound worse with every sentence.”
“It’s a neglected talent.”
The wind changed direction abruptly.
Until then it had come from the sea, damp and sharp. Now it blew from the mountain, hot and heavy with sulfur, ash, and that intense mineral scent of earth forced open. The torches the sailors had left at the base of the trail flickered in the distance, their flames bending as if trying to flee.
Zuko did not like the feeling crawling up the back of his neck.
It was the same one that came before ambushes, bad decisions, or fires too large to control.
“You do realize everything here is progressively getting worse?” he asked.
“And that doesn’t bother you?”
You cast him a sideways glance.
“It bothers me. It simply doesn’t disorganize me.”
He gave a small, disbelieving laugh.
“That may be the most irritating thing you’ve ever said.”
“Impossible. I usually try harder than that.”
Another sound rose from the island’s depths.
This time it came with a heavy crack, followed by the unmistakable sound of stone collapsing under its own weight. One of the sanctuary’s side platforms sank several inches. Dust billowed upward along the edges. Fragments tumbled down the staircase.
You only knelt enough to press your entire hand against the warmed ground.
Your fingers spread across the dark rock. Your breathing slowed. Your shoulders relaxed into absolute concentration.
To anyone watching from outside, it looked like stillness.
The vibrations came in layers.
The unstable surface of the ruins.
The compressed tensions beneath the foundations.
Veins of heat winding through the mountain.
You felt the touch returned.
Not a random vibration. Not natural movement.
As if the island had noticed your presence the instant you touched it.
“What is new?” Zuko asked, growing less patient by the second.
You did not remove your hand from the ground.
“The island is listening back.”
He stared at you for a full second.
“I need you to understand how much I hate that sentence.”
You lifted your eyes to him.
No pleasure in irritating him.
That was enough to silence him.
Zuko knew your sarcasm. Knew the way you cut through conversations for sport. Knew the quiet satisfaction you felt whenever you managed to make him lose patience.
But he also knew, with uncomfortable precision, the difference between that and raw truth.
And in that moment, you were telling the truth.
The ground split without warning.
The tremor came brutal and direct, sending a violent shock through the ruins. A crack tore through the central courtyard in an uneven line, splitting ancient stone like dry clay. The sound was loud, sharp, aggressive. Entire blocks tore free from a side wall. One column tilted dangerously.
He crossed the distance between you in two strides and grabbed your arm hard, pulling you backward at the exact moment the ground where you had been kneeling collapsed.
Stone exploded around you.
Dust rose in a thick cloud, swallowing the space for several seconds.
You lost your balance from the sudden force and collided into him. Zuko caught you by the waist before either of you fell, planting his feet on the unstable ground.
When the dust began to settle, you were far too close.
His arm still wrapped around your side.
His other hand still held your wrist by reflex.
Your fingers gripped the front of his tunic at his chest.
Both of you were breathing short and fast.
Your face was only inches from his.
Fine ash had settled on your lashes. A dark streak crossed the line of your jaw. Your usual scent of leather, weapon oil, and clean herbs had been overtaken by the smell of heated stone.
For one absurd and inconvenient instant, the mountain ceased to exist.
“Let go,” you said softly.
“You were about to be crushed.”
“Do you always react badly when someone prevents your death?”
“Only when it starts becoming a habit of yours.”
He held your gaze for one second longer before slowly loosening his arm.
You stepped back, straightening your posture and adjusting your armor as if your body had registered absolutely nothing about the contact.
“Thank you,” you added dryly.
“Don’t risk hearing another one.”
Before he could reply, a new tremor moved through the mountain.
Both of you turned at the same time.
High on the volcano, between cracks near the summit, orange lines began to appear beneath the dark skin of the rock. At first thin, almost subtle. Then brighter, pulsing red and orange like veins of light running beneath black stone.
The inside of the mountain glowed.
You felt the heat reach through the ground before it touched the air.
And with it, something inside you answered.
A sudden current ran through your arms to the tips of your fingers. Your chest tightened. Your breath failed for a second. The muscles in your hands contracted involuntarily, as if recognizing a forgotten language.
You had never felt that with ordinary earth.
Zuko noticed the change in you immediately.
You could not answer right away.
You kept staring at the mountain like someone seeing their own reflection where they never expected to find it.
Another glowing line appeared at the summit.
The volcano’s inner light was growing in rhythmic pulses, almost like heartbeats.
Beneath your feet, the stone called to you in a way no earth ever had.
You stepped forward without realizing it.
His touch pulled you back to the present.
You blinked, looking first at his hand on your skin, then at his face.
Zuko’s fingers were warm. They always had been.
But now that warmth seemed to echo the same energy rising from the ground.
“Are you hearing something?” he asked, alert.
When you answered, your voice came low, disbelieving, and edged with something close to fear.
“The stone... is burning.”
Zuko did not let go of your wrist immediately.
His fingers remained closed around your skin for a second longer than necessary, firm without hurting, warm without realizing they were. The contrast between that human warmth and the growing heat rising from the ground sent something strange through your body — a tension you could not tell whether it came from the danger, the mountain, or him.
The wind moved through the ruins carrying fine ash, which swirled around you before disappearing into the darkness. High above, the volcano pulsed with orange lines growing brighter by the moment, like embers hidden beneath cracked skin.
“The stone is burning?” Zuko repeated, quieter now, trying to understand whether he had heard correctly.
At last, you pulled your arm back.
But fast enough to restore a distance that, for some reason, felt necessary.
“Good, because it sounds terrible.”
You ran a hand over your wrist where he had held you, as though erasing the trace of his touch.
“Earth has weight, density, direction. You feel pressure, faults, movement. Rock responds in a specific way.”
Your eyes returned to the dark ground.
“This... doesn’t respond like stone.”
“Then what does it respond like?”
You hesitated for a moment.
The truth sounded absurd even inside your own mind.
“Like fire trapped inside it.”
Zuko followed your gaze to the fractured ground between the ruins. Thin strands of steam still escaped the fresh cracks. The heat was increasing gradually, steadily, almost intelligently.
He knew fire in all its moods: disciplined, chaotic, defensive, hungry, destructive, obedient. He had grown up trained to read flames the way others read human expressions.
That was not exactly fire.
But it was not only earth either.
“We’re retreating,” he decided, his voice returning to command. “Now. For real.”
“You use that tone with me as if it works.”
“When you almost died two minutes ago.”
You opened your mouth to answer, but the ground shook again.
This time it was not a sharp impact.
It was a prolonged shift, as if something enormous rolled beneath the island’s inner layers. The ruins trembled all at once. A side staircase collapsed in sequence, step by step, throwing up thick dust. A column toppled and split in half with a crash.
Both of you moved at the same time.
Zuko raised his arms in a quick arc and sent a short, precise stream of fire to deflect stones flying toward you. The flames struck the larger fragments, changing their trajectory just enough for them to pass to either side.
You stomped the ground a heartbeat later.
A wall of black rock rose before you in a movement both brutal and elegant, catching the remaining debris before it could strike. The impact traveled through your arms like an echo.
When the dust partially settled, you stood protected behind the improvised barrier.
“If you comment on the irony of me protecting you with stone while you protect me with fire, I’m leaving,” you said, breathing a little faster.
“I was thinking something more about how your dramatic timing is impressive.”
He lowered his guard first, but did not step away.
Behind the stone wall, the volcano’s orange glow reflected across his face in pulsing intervals. Light and shadow alternated over the Kyoshi paints of your armor. They made you seem less human and more like some ancient entity born from the island itself.
You noticed he was watching you.
The corner of his mouth nearly rose.
Another tremor came, more violent than all the others before it.
The barrier cracked in two dry lines.
You turned immediately, pressing both hands against the stone to hold it upright, but the next impact tore through the entire structure. Heat exploded upward from the ground just ahead.
A fissure opened in the central courtyard.
This time, more than steam emerged.
Bright orange light burst from the opening.
Both of you froze for an instant.
Thick, glowing, incandescent liquid moved beneath the crack like blood through an open vein. Molten rock bubbled slowly, pushing the edges of solid stone aside.
You stared at it without blinking.
Something inside your chest answered violently.
Your hands tingled. Your arms throbbed. The ground beneath your feet ceased to feel like terrain and began to sound like music played too loudly.
“Hey!” he repeated, louder.
Your eyes remained fixed on the glowing fissure.
The air around it warped with heat. The edges of your armor reflected orange. Your breathing had gone shallow.
Zuko grabbed your shoulder and turned you toward him.
This time you blinked, as if waking.
Your eyes met his, and there was something in them he had never seen before.
“I can feel it moving,” you said, almost in a whisper. “Every current. Every weight. Every change of direction.”
“Then use that to get us out of here.”
“That is usually your favorite phrase when you want to irritate me.”
The use of his name without provocation was enough to cut through the sarcasm.
You took a deep breath, trying to steady yourself.
“If I touch that... I don’t know what happens.”
He held your gaze for a moment.
The mountain roared in the distance.
Another fissure opened several yards to the left, spreading orange light across the ruined courtyard.
The ruins would not hold much longer.
“Then find out,” he said.
“That is irresponsible advice.”
“I’m excellent under pressure.”
“You’re insane under pressure.”
“And you’re the best earthbender I know.”
You stood still for a second.
Even surrounded by heat, collapse, and chaos, that sentence struck you with dangerous precision.
“Whatever this is... the island answered you. So answer it back.”
The world seemed to narrow.
Hot wind tearing through the night.
And him there, looking at you as though there were no doubt at all.
Then turned toward the fissure.
Knelt before the cracked stone.
And placed both hands on the incandescent ground beside the opening.
