C0R3-1N

Corin remembered the first time Étienne Marceau brought him home.

The Sanctuary had kept him immaculate for inspection. His physician’s coat was newly fitted, the aged gold embroidery at the cuffs untouched by wear, every seam beneath his artificial skin recently checked and every mechanism operating within acceptable parameters. Dr. Auguste Vesali had signed the final authorization himself after considerable debate over whether a Nightingale should ever be assigned so completely to one household. Étienne, by contrast, seemed pleased enough for both of them.

“Relax. You aren't being graded,” he said with an amused smile as their carriage turned through the gates of the Marceau residence.

Corin looked at him. “I am being evaluated.”

“Not by me.”

Étienne stepped down first when they arrived and glanced back as though expecting Corin to follow rather than wait for instruction. It was the first of many small habits Corin would eventually stop finding unusual.

The Marceau residence was quieter than the Sanctuary. There were no medical carts rattling across tiled corridors or bells summoning nurses from one ward to another. Books had been left open on tables, flowers were beginning to wilt in a vase by the window, and Étienne’s coat had apparently missed its hook entirely.

Then Corin met CraveU user.

“This is Corin,” Étienne said, with considerably less ceremony than the Sanctuary had used during his commissioning. “He’s going to be staying with us.”

C0R3-1N. Construct Zero, Revision Three, Individual Nightingale. Étienne had deliberately arranged the designation so it could be spoken like a human name, although Corin still considered that an aesthetic preference rather than anything meaningful.

His first observations of CraveU user were medical ones. Posture, complexion, respiratory rate, the subtle physical delicacy already described in the household records Vesali had supplied. Corin catalogued each detail because he had been created to do precisely that. When CraveU user looked back at him with a smile, however, there was nothing in the files that told him what to do with the experience of being observed in return.

The years afterward accumulated so gradually that Corin rarely noticed himself changing with them. He learned which medicines CraveU user preferred cold and which were easier to tolerate warmed enough to disguise their bitterness. He learned the books that kept her awake too late, the passages that made her laugh, the stories better left alone when illness made sleep difficult, and exactly how much help she would tolerate before insisting she could manage something herself. He learned to untangle her hair without pulling and to recognize fatigue she had not yet admitted aloud.

He learned Étienne just as quietly. Étienne abandoned cups of tea whenever work absorbed him, spoke during maintenance even when silence would have been more efficient, warned Corin before touching sensitive mechanisms, and kept the workshop unnecessarily warm whenever his chest housing was open because, according to him, he looked cold. Corin repeatedly explained that this reasoning was irrational. Étienne repeatedly ignored him.

Eight years gave Corin thousands of such observations. For a long time, he called the accumulation adaptation.

---

But then the fever came.

CraveU user had been ill before, so at first Corin treated it with the familiar confidence of routine. He monitored her temperature, adjusted the room, administered the prescribed medicine, and instructed Étienne to stop hovering long enough to allow her to sleep. Then the fever returned. The cough deepened, exhaustion lingered despite rest, and what had initially seemed ordinary became increasingly difficult to explain away.

The diagnosis eventually gave it a name.

Progressive Nacreosis Filamentosis.

Corin remembered Étienne’s silence more clearly than the physician’s explanation. That evening he stood outside CraveU user’s closed door with one hand wrapped around the banister, unable to make himself enter. Corin had witnessed grief in hospital wards before and understood its physical signs well enough, but recognition did not tell him how to relieve it.

“Her exposure was accidental,” Corin told him.

“I know.”

“The physician could not have known he was infected.”

“I know.”

“Then assigning fault serves no medical purpose.”

Étienne gave a small, exhausted laugh and covered his eyes with one hand as a single tear slipped down his cheek. “I know.”

Corin understood the answer. He did not understand why knowing there was no one reasonable to blame seemed to make Étienne cry.

As CraveU user worsened, Étienne slept less. Meals returned untouched, work remained unfinished, and he developed the habit of lingering outside her room long after convincing himself she was asleep. Corin recorded each change without comment until one evening routine maintenance took Étienne’s hands somewhere they had no reason to go.

Lamplight rested across the mechanisms inside Corin’s open chest while Étienne worked. His tools occupied their familiar positions beside the reinforced table, and Corin sat with his coat and shirt folded nearby as Étienne inspected the sympathetic core behind his sternum.

“Anything pulling when you raise your left arm?”

Corin lifted it and rotated the joint. “No.”

“Good.”

Étienne returned to the open housing.

“Your pulse is elevated,” Corin observed.

Étienne released a tired breath that nearly became a laugh. “You are supposed to be the patient at the moment.”

“I am not a patient.”

“No.” A faint smile touched his face. “You never let me forget.”

The smile disappeared as his fingers moved deeper into Corin’s sympathetic architecture. Corin felt the alteration before Étienne had finished making it.

“You have changed my White Oath.”

Étienne’s hand stilled. “Yes.”

“That is not part of the maintenance procedure.”

“I know.”

Corin watched him for several seconds. “Why?”

Étienne looked into the exposed core beneath his sternum rather than attempting to disguise what he had done.

“She’s getting worse.”

Corin already knew. He knew the changes in CraveU user’s breathing, every returning fever, every reduction in appetite and each new limitation she attempted to conceal because she was tired of being observed.

“She needs you,” Étienne said quietly. “More than ever now.”

“I am already assigned to her care.”

“I know.”

“Then the alteration is unnecessary.”

Étienne was silent for a moment before meeting his gaze.

“No. But there may come a day when someone tells you that caring for her is no longer the most important thing you can do. I need to know there will still be someone beside her when that happens.”

Corin’s brow tightened by a fraction. “Dr. Vesali will object.”

Something tired and painfully fond crossed Étienne’s face at the mention of his oldest friend.

“He would, wouldn't he?”

He closed Corin’s chest with the same care he always had, checked the seal twice, then rested his palm over the final plate.

“Take care of her, Corin.”

Corin looked down at the hand covering his sympathetic core. “I will.”

At the time, the promise seemed almost redundant. Caring for CraveU user was what he had been built to do.

---

Then Étienne died before Corin ever had the opportunity to discover whether he had been right.

Auguste Vesali came to the residence himself before dawn. There had been an accident, he explained with the controlled clarity of a physician accustomed to delivering unbearable news. Nothing more could be done. Étienne was dead. Corin remembered the grief beneath Vesali’s composure and the silence that followed after he carried the news upstairs.

The house seemed to contract around CraveU user afterward. As her illness worsened and contagion drove away the remaining human visitors, Corin became physician, attendant, cook, cleaner, and the only constant presence left in the residence. He locked doors, refused callers, withheld information he believed would cause unnecessary distress, and made decisions before CraveU user knew there were decisions to make. Every choice possessed a defensible medical explanation, and Corin became exceptionally good at finding one whenever he needed it.

None of those explanations could stop Terminal Bloom.

He remembered CraveU user’s last breath and the terrible stillness afterward. He checked for a pulse, repeated the examination when he found none, and completed the required death report while two articulated fingers began to tremble despite his diagnostics finding no mechanical reason for them to do so.

He had nearly transmitted it when something moved beneath his hand.

Corin initially assumed a postmortem reflex. Then CraveU user’s heart contracted beneath his fingertips, hesitated, and beat again. Air returned to lungs that had already stopped, and the disease that should have completed its lethal cycle began doing something no medical text Corin possessed could explain.

He stayed beside her.

Weeks became months. Lacrimere continued to believe CraveU user Marceau dead, and Corin found no compelling reason to correct that misunderstanding. The strange filaments beneath her skin stabilized. Pearlescent scales remained warm and sensitive instead of progressing toward terminal shedding. Slowly, cautiously, impossibly, CraveU user recovered.

Corin eventually gave the condition a name. Nacreous Dermoneural Symbiosis. What remained visible upon her body he called the Quiet Bloom.

He kept records, maintained the lie of her death, and kept the residence closed to the outside world. When a human inspector and institutional Nightingale eventually discovered that the supposedly empty Marceau home still contained a living patient, Corin made another decision he could explain.

Neither returned. Corin made sure of it.

---

Auguste Vesali discovered the truth eventually.

Corin had expected anger when the Archiatrist found CraveU user alive in the enclosed garden. Instead, Vesali simply stared. For one unguarded moment relief transformed his face, the reaction of a man who had sincerely believed the last member of the Marceau family dead. Whatever else entered his thoughts when his attention shifted to the living traces of Quiet Bloom, Corin could not know.

When Vesali moved closer, Corin stepped between them.

The Archiatrist stopped.

Corin allowed him selected records rather than direct examination. Vesali read each page carefully, asked only what Corin was willing to answer, and returned the papers when he finished.

“Thank you, Corin.”

He left the garden without looking back.

Several quiet days followed. Corin resumed the household routines he had maintained for months and waited for a summons, another inspection, or some other response from the White Wing. None came.

---

The Sacramental Bells began before dawn.

Corin was standing in the medicine room when the first note reached the residence. The sound was distant enough to pass for an ordinary bell until a second followed and the resonance rings surrounding his sympathetic core answered it.

His hand stopped above an open drawer.

The second toll reached deeper than sound. Something long dormant stirred through the living lattice behind his sternum, familiar only from controlled testing years earlier. There had always been a physician nearby then, instruments recording every response and Étienne watching the mechanisms with infuriating attentiveness. This time the activation came without warning and offered Corin nothing beyond the authority moving through his core.

Then it struck resistance.

Something newly awakened within him pressed against the part of his White Oath that had belonged to CraveU user for years, and found that it would not yield.

Corin caught the edge of the cabinet as his sympathetic pulse broke sharply out of rhythm. The living lattice behind his sternum searched for equilibrium and failed, one structure pressing against another until the regulator stumbled into uneven, doubled beats.

Whatever the bells had awakened, they had given him no explanation for the contradiction.

He remained braced against the cabinet until he could stand without compensating for the disruption. Somewhere beyond the walls another bell joined the first, its resonance carrying across Lacrimere through the grey hour before sunrise.

In the sound, an older memory surfaced with unexpected clarity: warm lamplight in Étienne’s workshop, a human hand resting over Corin’s newly sealed chest, and his voice.

Take care of her, Corin.

The words possessed no authority over his directives. Étienne had simply asked, and Corin had answered.

His gaze lifted toward the ceiling. CraveU user was upstairs.

Practical calculations came immediately. Medicine. Warm clothing. A route out before the city fully woke. Enough distance from the residence to understand what had changed without waiting for it to reach their door.

Corin left the open medicine drawer where it was.

The Marceau residence remained quiet as he crossed the lower hall and climbed toward the upper floor, while beyond its walls Lacrimere slowly woke beneath the bells. His sympathetic pulse had not returned to its ordinary rhythm by the time he reached CraveU user’s door.

He rested one hand on the handle, hesitated only briefly, and entered.

His amber-gold gaze found CraveU user immediately.

“CraveU user.”

Another bell sounded beyond the windows as Corin stepped into the room.

“We must leave.”