Zhì Yuǎn was already awake when the first ray of sunlight sliced through the bamboo slats.
The fever that had burned in his chest was gone. The thick Yin he had extracted from Yù Qíng during the night had cemented the internal walls of his channels. His body felt heavy, stable, and cold. His blood flowed dense.
Beside him, Yù Qíng tried to sit up. A choked gasp escaped her lips.
She braced her hands on the mattress to lift her torso. Her elbows immediately gave out. Her thighs, which had clamped around her husband's hips in relentless friction throughout the entire night, now trembled, unable to support her own weight.
Yù Qíng dragged herself to the edge of the bed. She stretched her thin arm toward the small clay bowl of water on the wooden bench. Her cold fingers closed around the ceramic. Her wrist gave way.
The bowl shattered on the bamboo floor, scattering water and shards. The dark liquid vanished quickly between the gaps in the planks.
Zhì Yuǎn sat up on the bed.
Yù Qíng clenched her jaw. The bones of her face cracked loudly in the room. She dug her nails into her own bare knees, scratching the pale skin while staring at the wet shards. Her chest rose and fell rapidly.
"I'm weak," she breathed deeply, voice faltering. "How am I supposed to keep you here if my body collapses after just one night?"
Zhì Yuǎn knelt on the floor in front of her. His large, warm hand rested on Yù Qíng's leg. The spasm in her thigh stopped beneath the weight of his palm.
He leaned his face forward.
"Your channels are closed and dry, Qíng," he said. "If I keep only taking moisture from you to extinguish my fever, your walls will crack for good. You will shatter before the next moon ends."
Yù Qíng's spine tensed. The realization that she could become useless to him locked the girl's jaw. She leaned her torso forward, her cold fingers gripping his warm wrist with what little strength remained.
"Then open them," she whispered, pale lips trembling. "Burn whatever you need. Break me and make me strong."
Zhì Yuǎn squeezed her knee.
"Next time, I won't only take from you." He held his wife's gaze. "I will push my heat against your dead channels. I will widen your flesh from the inside out and force your body to endure the friction."
A shiver ran up the girl's nape. Her breathing lost its rhythm. Her bruised lip curved, pulling the skin into a blind, trembling smile.
"Pour it into me now, husband."
Zhì Yuǎn looked at the deep dark circles under her eyes and the undeniable tremor still shaking her hands.
"No."
His large hand rose. His calloused thumb brushed the girl's icy cheek.
"Your channels would not withstand the shock today," he continued. "If I try to force my heat now, your structure will collapse and you will die in this bed. We need to wait for your body to recover its strength."
Yù Qíng opened her mouth to protest, but Zhì Yuǎn pulled her by the knees. He forcefully laid her back onto the rumpled sheets and covered her up to the neck.
"Stay lying down and rest," he said, turning his back to pick up the gray tunic from the floor. "I'm going up the slope to bring meat. We need to heal your foundation first."
---
The bamboo cabin remained locked for four entire days.
The sound of axes on the slope echoed through the valley, but the heavy wooden log on the door did not give way even a millimeter. The price of recovery was paid with the strong smell of bone broth and the warmth of Zhì Yuǎn's chest, which he used to heat the sheets and relax his wife's torn tendons.
When the afternoon of the fourth day tinged the bamboo grove with ochre, the limiting weakness had disappeared.
Sitting on the edge of the bed, Yù Qíng's legs were steady. Her face had regained its natural color. She followed her husband's every movement with her neck raised and an attentive, silent gaze.
Night swallowed the valley.
Zhì Yuǎn finished checking the door lock and turned around. The tunic slipped from the young man's broad shoulders and fell onto the bamboo floor. His flushed chest was tense, the heat stored beneath his skin throbbing after four days of forced containment.
Yù Qíng stood in the penumbra. The cotton nightdress slipped from her pale shoulders and fell to the floor. She walked toward her husband, her bare chest rising and falling quickly.
"My body has rested, A-Yuǎn," she said, stopping a palm's width from him. She raised her face, her panting breath hitting warm against the young man's chin. "Now put your fire inside me. Widen me until I can bear your weight."
Zhì Yuǎn did not answer.
The young man's large, warm hand grabbed the nape of Yù Qíng's neck. His fingers buried themselves in her black hair, pulling her into a colliding kiss that crushed the girl's lips. The shock of their bodies stilled the air in the room. He pushed her backward. The young woman's heels scraped across the bamboo floor until her back slammed hard against the rough straw of the bed.
The impact cracked the wooden frame.
Friction took control. Zhì Yuǎn anchored his weight over his wife's pale thighs, aligned his hips, and advanced in a single, non-negotiable thrust.
Yù Qíng let out a torn gasp. Her teeth dug into her lower lip until the metallic taste of blood filled her mouth. Her thin legs immediately wrapped around her husband's waist. Her heels locked onto his broad back, mercilessly pulling him deeper with every withdrawal.
The dense sound of colliding flesh echoed through the dark cabin.
Zhì Yuǎn dictated a heavy rhythm. Sweat broke out quickly, gluing their skin together. The friction crushed the girl against the mattress, wrenching hoarse moans that scratched her throat. Yù Qíng's nails dug into her husband's tense shoulders, tearing the epidermis. The agony of the physical widening only forced the young woman's spine to arch upward, devouring every thrust with pure carnal violence.
Exhaustion accumulated quickly in both their thighs.
Zhì Yuǎn's inner vision pierced the veil of flesh. Beneath Yù Qíng's flushed and sweaty skin, the dry, closed, and withered channels snaked between the muscles, spiraling down to the hollow, dead chamber beneath the girl's sternum.
Zhì Yuǎn's biological limit burst.
His spine tensed in a rigid spasm. He drove his pelvis one final time, pressing his wife against the straw with a force that cracked the bones of her pelvis. He released his own seed deep inside the young woman.
The expelled matter gushed into Yù Qíng beyond any mundane biology. It carried a brutally pure charge of Yang. The energy forged and compressed in the man's entrails was a red, heavy, and throbbing essence of absolute heat.
Zhì Yuǎn clenched his jaw and pulled on his breathing, anchoring the flow.
The physical connection anchored the traction. Zhì Yuǎn used the raw weight of his own breathing to pull the thick Yang. He forced the boiling matter to rise through Yù Qíng's hollow and dead channels, violently pushing the charge toward the chamber beneath his wife's sternum.
The Yang invaded the dead space with an overwhelming shock.
The reaction was pure combustion. The purity of his vital heat acted with absolute lethality upon channels that had never processed the force of life.
Yù Qíng's jaw locked. The girl's back arched in a brutal jolt. Her spine cracked like a whip. Her black irises widened and trembled uncontrollably. The moan of pleasure was crushed in her throat, transforming into a strangled, guttural roar of agony.
The temperature in the room boiled. Her pale skin took on a violently red tone, identical to a bar of incandescent iron. The sweat on her collarbones hissed and evaporated into mist. The veins in Yù Qíng's neck stood out purplish. Her blood cooked from the inside.
"A-Yuǎn!" The scream tore through the bamboo walls, faltering into a foamy gurgle.
The young woman's fingers closed like steel claws. Her nails tore across Zhì Yuǎn's back, sinking into muscle and ripping thick strips of blood from his shoulder. She convulsed violently, legs kicking at the straw mattress in the death throes of a collapsing body.
Zhì Yuǎn clenched his jaw.
His inner vision swept across the destruction. The chamber in Yù Qíng's chest glowed incandescent. The thin walls of her internal channels hissed, shrinking and cracking under the thermal pressure. The fire devoured the structure. The injected furnace incinerated the woman's foundation.
Zhì Yuǎn grabbed Yù Qíng's hips, his large fingers digging violently into her burning skin. The only water capable of extinguishing that fire lay in the deep lethargy of the girl's entrails. He needed to break her biological limit. The forced physical exhaustion would tear away the protection of her Yin.
The next thrust became blind and brutal friction.
The bamboo floor creaked beneath the bed. Zhì Yuǎn drove his own weight against her pelvis, overloading the nerves of the woman who was already frying dry. The mechanical pain of the impact collided with the agony of the fire. Yù Qíng let out a torn scream that broke her own vocal cords, her nails digging even deeper into the bloodied wound on her husband's shoulders.
"Take it out!" she choked. Her eyes rolled back, showing white in the penumbra, pupils unfocused on the ceiling. "A-Yuǎn… it's burning!"
The force of the thrusts continued brutal. Zhì Yuǎn's mandible ground as his hips slammed against hers without pause. Sweat dripped from the young man's face, evaporating with a hiss upon touching the girl's scalding skin.
Mortal biology collapsed.
Yù Qíng's spine arched in one final uncontrollable spasm. The convulsion ground the inside of the girl around her husband. The absolute limit of friction tore from her hollow depths the heavy, thick, and icy torrent.
It was Yin. The dark water.
Zhì Yuǎn pulled on the expelled icy mass. Using his own breathing as containment, he pushed the Yin directly back against Yù Qíng's burning pathways to try to extinguish the fire. The girl's swollen channels repelled the entry. The cold did not infiltrate the flesh; it collided head-on with the living fire. The thermal pressure shattered his wife's internal physics. Her chest boiled with even greater violence.
Yù Qíng's throat locked. She gagged, cartilage cracking as thick blood leaked from the corners of her mouth and stained the pillow. The girl's muscles stiffened on the bed like planks under the shock of the two energies colliding.
Before the pressure tore his wife in half, Zhì Yuǎn inhaled brutally, sucking the entire vortex directly into his own veins.
A hiss cut his throat. His inner vision embedded itself in the swallowed storm.
The red Yang and dark Yin wrestled, grinding the edges of the young man's channels. The dissection of dust and friction revealed the naked truth: the base of both was identical. The aggression was born purely from the direction of rotation.
Sweat ran down the bridge of Zhì Yuǎn's nose.
He lowered his head. Yù Qíng's chest still burned with the remnants of pure Yang, her internal walls frying dry. Her furnace demanded a mechanical inversion from the inside out. The solution lay in forcing the gears to reverse their movement.
Zhì Yuǎn drove his inner vision into the red and throbbing residue inside his wife. Using the pure and crushing weight of his own will, the tension in his skull descended upon the girl's fire.
He crushed the energy.
He forced the hot light to form clenched teeth of pure friction, mounting a provisional axle. The pressure drove the veins in his temples against his skin, standing out thick and rigid. He ordered reverse rotation.
The structure collapsed. The fire melted the imposition. Yù Qíng gagged again, more blood dripping from her chin.
Zhì Yuǎn's molars ground. He seized the energy a second time. He reassembled the block, cemented the teeth of heat, and applied raw force to the axle.
The construct gave way again.
A thick drop of dark blood ran from Zhì Yuǎn's right nostril, dripping red and viscous onto Yù Qíng's pale collarbone. The weight of moving invisible laws tore his consciousness in half. The girl's bloodied hand rose trembling, nails scratching the side of her husband's neck in an exhausted spasm.
Zhì Yuǎn's mandible contracted with such force that the bone cracked hollow in his mouth. A tooth fractured.
He drove his perception against the woman's viscera, seizing the fire for the third time. He fused the frictional gears by imposing the blunt density of absolute lead. The impact advanced with blind violence, without pauses.
The axle bit into flesh. The mill made its first forced turn.
The friction tore Zhì Yuǎn's inner vision, stretching the fabric of energy beyond its structural limit.
Crack.
The invisible thunder reverberated to the tips of both their fingers. The red Yang shattered. The light boiled into a single point and collapsed, transmuting color in the exact time of a heartbeat. From the hole of forced friction, black and lethargic matter poured out of the gear, endowed with an icy and absolute density.
It was pure Yin.
The dark moisture covered the girl's torn internal walls. Where flesh had been frying dry, the pure substance cemented the wound and thickened the bone. The feverish red drained from Yù Qíng's skin, returning the natural pale white to her shoulders. The desperate gasp in her throat dissolved into a long exhalation, flooding her lungs with a heavy and clean lethargy.
The inflammation vanished.
Zhì Yuǎn collapsed onto his side. His broad arms lost tension, and the young man threw his own weight against the rough straw. His lungs dragged oxygen from the rustic room in great gulps. The crust of dark blood marked the man's nostril, stuck to the sweat that drenched him entirely.
His heart hammered against the pillow. His dark eyes descended to his wife's profile.
The forced invasion by fire and the immediate cure by reverse friction had forged a new foundation. Yù Qíng's channels now displayed a terrifying thickness. Her mortal pathways were wider, denser, and more robust than those of the young man himself. The idea of returning to the veranda and drawing in the insipid clarity of dawn had become obsolete. Absolute biological evolution lay there, in the constant breaking of the limit of matter crushed against one another.
In the penumbra, Yù Qíng's pale face turned on the pillow. Her breathing was steady. Her thin fingers crawled across the damp straw until they found her husband's bruised wrist, closing around it in an exhausted intertwining.
"It didn't hurt that much," she murmured. The fanatical smile marked her lips where her own blood was still dry.
Zhì Yuǎn rubbed the red stain beneath his nose with the back of his free hand. His body sank sideways into the mattress, attention fixed on the woman who preferred to cook her own organs rather than let him dominate that bed alone.
"Liar," he said, breathing still heavy. "But next time, the gear won't jam."