Chapter 82: The Eye Cure Problem

The new desk in the Chief Medical Officer’s suite was not mahogany.

It was a highly practical, incredibly dense slab of brushed industrial steel. It lacked any sort of executive elegance, bolted directly to the floor with reinforced brackets.

Ren walked into the office, his dark eyes casually taking in the new furniture.

"I see Kakuzu personally handled the requisition form," Ren noted, taking a seat in the visitor’s chair.

Tsunade sat behind the steel desk, completely ignoring the joke. She was wearing her pristine white medical coat, her blonde hair tied back tightly. There was no trace of the woman who had been running on sake, coffee, and rage two nights ago. She was entirely in her element, surrounded by medical charts, tissue samples, and the heavily sealed black scroll Ren had purchased from Orochimaru.

"Roll up your sleeve," Tsunade ordered.

Ren raised an eyebrow, but he unbuttoned the cuff of his tailored grey suit and rolled the fabric up past his elbow. "Straight to business today. No pleasantries?"

"I don’t exchange pleasantries with patients who are actively going blind," Tsunade said flatly.

She opened a sterile drawer and pulled out a syringe. It was not a standard hospital needle. It was a terrifyingly thick, heavy-gauge extractor designed for deep-tissue marrow and dense chakra-blood draws.

Ren stared at the needle. "I usually require a formal contract before authorizing an extraction of that size."

"Make a fist, or I bypass your arm and put this directly into your jugular," Tsunade countered, her voice devoid of any humor.

Ren made a fist.

Tsunade tied a tourniquet around his bicep. She didn’t hesitate or offer a warning. She slid the thick needle smoothly into the prominent vein in the crook of his arm, her chakra flaring green at her fingertips to numb the immediate area. Dark, chakra-rich blood began to fill the glass vial.

"I spent the last thirty-six hours running test formulas from Orochimaru’s data," Tsunade explained, her eyes fixed on the vial. "The math is brilliant. But his methodology is psychotic."

"He was operating on a limited budget," Ren offered.

"He was operating like a butcher," Tsunade corrected sharply. She swapped the full vial for a second empty one. "His answer to rejection is brute force. He designed a serum that aggressively attacks the host’s immune system, forcibly binding the regenerative tissue to the nervous system before the body can fight back."

Ren watched the second vial fill. "Efficient."

"Suicidal," Tsunade snapped. "If I synthesized these drops and put them in your eye today, the Hashirama cells would violently root into your brain stem. You wouldn’t get an Eternal Mangekyō. You would turn into a heavily armed piece of landscaping within forty-eight hours."

Ren’s corporate smirk finally faded. "I assume you have a counter-proposal."

Tsunade withdrew the needle, pressing a cotton swab hard against the puncture wound. "I do. But the cure needs to be stabilized, and that requires three distinct components."

She tossed the used syringe into a hazardous waste bin and placed his blood vials into a specialized chakra-stasis cooler on her desk.

"First, I have to weaken the Hashirama tissue enough that it stops trying to eat everything around it," Tsunade said, leaning forward on the steel desk. "Second, I need your blood to map how your eye handles chakra. Third, I need something to reinforce the pathways around the optic nerve before any new cells touch them."

Ren glanced at the cooler holding his blood. "Timeline?"

"Weeks," Tsunade said. "Assuming the tissue samples don’t try to murder each other in the dishes."

"Timeline?" Ren asked, adjusting his sleeve.

"Weeks. Assuming the tissue cultures don’t cannibalize each other," Tsunade said.

She stood up from her chair and walked around the desk. "Look at me."

Ren looked up. Tsunade stepped directly into his personal space, her hands glowing with a highly concentrated, brilliant green medical chakra. She placed her thumbs gently on his cheekbones, pulling his eyelids slightly wider to examine his eyes.

The physical proximity was intense, but there was zero tension. It was a purely clinical, deeply unnerving examination.

Tsunade’s amber eyes narrowed as she peered into his right eye. The cloudy, milky degradation had spread slightly since her last checkup. The damage had spread from the optic nerve in thin, ugly lines.

"It’s fraying," Tsunade murmured, her glowing thumbs hovering over his skin. "The degradation is accelerating."

She dropped her hands, the green chakra fading. Her expression was deadly serious.

"This is not a negotiation, Ren," Tsunade said, her voice dropping into a hard, absolute command. "You are officially cut off."

Ren’s eyes narrowed slightly. "Clarify."

"No Mangekyō," Tsunade stated firmly. "No Black Vault. No localized space-time storage. And no using the other eye just because you think prediction is gentler. The strain still runs through the same damaged network. If you spin that pattern before I finish stabilizing this serum, the sheer chakra pressure will snap the remaining healthy tissue."

"You are taking all the fun out of surviving assassination attempts."

Ren processed the medical reality. He was about to enter a corporate war with Danzo Shimura, and his most lethal, untraceable weapon had just been legally revoked by his doctor.

"What if there is a hostile acquisition?" Ren asked smoothly. "Danzo’s Foundation has already shown an interest in auditing my lumber yards with explosive tags."

"Then you fight with your standard Sharingan," Tsunade fired back, crossing her arms. "You use a sword. You throw money at them. I don’t care how you survive, Ren. But if you activate Black Vault again, you will go permanently, irreversibly blind in that eye. I cannot fix dead tissue."

The office was quiet. The steady hum of the hospital ventilation system filled the silence.

Ren looked at the steel desk, the stasis cooler holding his blood, and the fiercely uncompromising Sannin standing in front of him. He needed the cure. He needed her to build it. And he knew she wasn’t bluffing about the consequences.

Ren stood up, straightening his charcoal vest.

"I will restrict my hostile takeovers to standard corporate violence," Ren agreed.

"See that you do," Tsunade warned, walking back around her desk to check the cooler temperature. "I will send word when the first batch of the rejection-buffer is ready for testing. Do not rush me."

"I would never rush a genius at work, Lady Tsunade," Ren said smoothly, walking toward the door.

"And Ren?"

Ren paused, his hand on the doorknob, and looked back.

Tsunade wasn’t looking at him. She was already entirely focused on the blood samples, her pen moving rapidly across a medical chart.

"If Kakuzu tries to bill my department for those blood vials," Tsunade said without looking up, "I will surgically remove his spleen."

Ren smiled faintly. "I will advise him of the liability."

Ren stepped out of the office and closed the door behind him.

The smile dropped from his face the moment he was alone.

He walked down the sterile hallway, his mind already rearranging risks, escape routes, and worst-case plans. He was officially grounded. His Mangekyō had been locked away behind a medical ultimatum.

Danzo had already shown an interest in auditing his lumber yards with explosive tags.

If the old war hawk escalated again, Ren would have to fight the next round without his most unfair weapon.

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