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The argument, as most arguments did in the Uchiha-Senju household these days, started over the thermostat.
“It is scientifically proven,” Tobirama stated, his voice the epitome of calm, infuriating reason as he adjusted the dial downwards, “that a cooler ambient temperature promotes better sleep and reduces inflammation in aging joints.”
Madara, swathed in a thick, ridiculously plush purple robe that made him look like a disgruntled aubergine, glared from his armchair. “It is also scientifically proven that I am a master of the Great Fireball Jutsu and you are a man made of water and spite. I am cold, Tobirama. My Uchiha blood is thin and requires warmth, not this arctic tomb you insist on cultivating.”
“Your blood is perfectly normal,” Tobirama retorted, not looking up from his task. “You are just dramatic.”
“My drama is the fire that forged this village!” Madara declared, gesturing grandly with a hand that was currently holding a half-eaten rice cracker. Crumbs flew.
Tobirama’s eye twitched. “Hashirama’s wood style and my administrative prowess forged this village. Your ‘drama’ nearly got it burned down five separate times. And you’re getting crumbs on the rug I just programmed the cleaning seals to vacuum.”
At sixty-eight and sixty-seven respectively, Madara Uchiha and Tobirama Senju were, by all accounts, retired. The position of Hokage had been passed to a bright young Sarutobi, the village was stable, and their legendary days of war were long behind them. This, in theory, should have led to a peaceful, golden era for the two most powerful (and cantankerous) shinobi of their generation.
In practice, it meant they had far too much time on their hands.
Madara’s retirement consisted of terrifying the next generation of Uchiha children under the guise of ‘teaching’ them the Great Fireball Jutsu, and writing his memoirs (currently on volume seven, “The Incompetence of the Feudal Lords and Other Assorted Fools”).
Tobirama’s retirement, on the other hand, was a terrifying extension of his lifelong work. Freed from the constraints of village R&D budgets and ethical oversight committees (which he had created and could therefore artfully ignore), their home had become his personal laboratory. His twin passions remained the creation of new jutsu and the ever-expanding possibilities of fuuinjutsu. Lately, his focus had shifted from the battlefield to the homefront, a project he privately titled “Optimizing Domestic Life Through Sealing Arts.” Madara called it “a waking nightmare of sentient appliances.”
“It’s not balanced! It’s biased towards the water-bending icicle I had the misfortune of wedding!” Madara groused, standing up. His knees popped audibly. He ignored them. “I’m turning it back up.”
“If you touch that dial, Madara, I will recalibrate the rice cooker to make only bland, unsalted porridge for a week.”
Madara froze, hand hovering over the crystal. His Sharingan spun to life out of sheer, petty indignation. “You wouldn’t dare.”
Tobirama’s expression was flat. “My entire life has been a monument to daring. Do not test me on matters of porridge.”
A tense silence filled the room, broken only by the gentle hum of the chakra-powered refrigerator. Madara, the Ghost of the Uchiha, the man who had faced down armies, slowly lowered his hand. He was not afraid of any man, but a week of bland porridge was a horror beyond reckoning.
He settled for a compromise. “Fine. But I’m using the prototype.”
Tobirama sighed, the sound of a man who knew he was about to regret something. “The Self-Warming Tea Cozy is not ready for field testing. The heat regulation seal is… volatile.”
“I am a Uchiha. I can handle a little volatile heat,” Madara sniffed, stalking into the kitchen.
He returned moments later with a steaming mug of tea, upon which sat a knitted cozy interwoven with glowing sealing tags. It was pulsing with a gentle, orange light and emitting a low, ominous hum. Madara placed it on the table next to his armchair with a triumphant smirk.
They sat in silence for a few minutes. Madara read his book. Tobirama analyzed a scroll detailing a new barrier jutsu. The tea cozy continued to hum. Then, it began to vibrate.
“Is it supposed to be doing that?” Madara asked, peering at it suspiciously.
“The kinetic energy output is slightly higher than my projections,” Tobirama murmured, not looking up. “It’s probably fine.”
It was not fine.
The hum escalated to a high-pitched whine. The orange glow intensified to a blinding white. A thin spiral of smoke began to rise from the wool.
“Tobirama,” Madara said, his voice dangerously low. “My tea is beginning to boil. Inside the mug .”
Tobirama finally looked up, his eyes widening fractionally. “Ah. The feedback loop must have engaged. Channel your chakra into the seal for ‘stop’—the kanji character on the top!”
Madara fumbled with the cozy, which was now shaking so violently the whole table rattled. He slammed his thumb onto the glowing character for ‘stop’ and channeled his chakra, but the feedback loop was accelerating too quickly. He was a fraction of a second too late. Instead of deactivating, the cozy shot off the mug like a cannonball, ricocheted off a framed portrait of Hashirama (knocking it askew), and embedded itself in the far wall, where it burst into a small, contained, but very angry-looking fireball.
The newly installed sprinkler system, another of Tobirama’s inventions, activated immediately, dousing the entire living room in a freezing spray of water.
Soaked and sputtering, Madara stood dripping in the center of the room, his magnificent robe now a sad, clinging rag. The burned-out tea cozy smoldered in the wall. The portrait of a grinning Hashirama was now permanently crooked.
“Optimizing domestic life,” Madara said, his voice a low, trembling pillar of rage, “is it, dear husband?”
Tobirama, equally drenched, pushed his wet silver hair off his forehead. He had the decency to look mildly chagrined. “The execution was flawed, but the theory was sound.”
Before Madara could formulate a retort that adequately expressed the full depth of his fury, the front door slid open.
“Hello? We brought dango!” Hashirama’s booming, cheerful voice announced. He strode in, followed by a much more reserved Izuna, who took one look at the scene and raised a perfect eyebrow.
Hashirama froze, a box of sweets in his hand. He surveyed the flooded room, the hole in the wall, his crooked portrait, his soaking brother-in-law, who was radiating enough murderous intent to curdle milk, and his own brother, who was already pulling out a scroll to take notes on the sprinkler system’s spray radius.
“Oh, dear,” Hashirama said, his shoulders slumping. “Did you two have another… science incident?”
Izuna stepped carefully around a puddle, his gaze sharp. “Brother, are you alright? Did the Senju try to drown you again?”
“It was an accident!” Tobirama snapped, defensive. “A calculated risk in the pursuit of progress!”
“You turned my morning tea into an explosive projectile!” Madara roared, pointing a trembling finger. “This is an assassination attempt disguised as domesticity! I see through your schemes, Senju!”
“If I wanted to assassinate you, Madara,” Tobirama said with chilling calm, “you would be dead. I wouldn’t need a tea cozy.”
This, somehow, was the most romantic thing he had said all week. It did little to quell Madara’s immediate rage.
Izuna sighed, pinching the bridge of his nose. He looked at Hashirama. “This is why we don’t visit before noon. Their 'golden years' are more chaotic than the Warring States period.”
Hashirama, ever the optimist, just beamed. “Nonsense! It just shows they’re still passionate! Look at that spark!” He gestured towards the smoldering hole. “Now, who wants dango? It might help absorb some of the water.”
Later that evening, the water was gone (thanks to a water-style jutsu that unfortunately also sucked all the moisture out of Madara’s prize-winning orchids, sparking a secondary, smaller argument), the hole was patched (with a sloppy wood-style plug from Hashirama that Madara would complain about for weeks), and the crooked portrait was left as a monument to the day’s events.
Madara sat huddled by the fireplace, which he had roaring at a frankly unsafe level, wrapped in every blanket he could find. Tobirama sat at the table, meticulously dismantling the remains of the tea cozy.
“The energy conversion formula in the primary seal is completely fried,” Tobirama murmured, mostly to himself. “I should have based the regulatory matrix on a four-symbols array. The simple trigram I used was clearly insufficient to handle the recursive energy flow.”
Madara grunted from his blanket cocoon. “Or, and hear me out, you could just let me heat my own damn tea with a whisper of fire chakra like a normal person.”
“Normal is inefficient,” Tobirama replied without looking up.
A comfortable silence descended. The fire crackled. The house was warm. Madara, despite himself, felt the tension seep out of his old bones. It was infuriating. It was ridiculous. It was… home.
“Tobirama.”
“Hm?”
“The porridge tomorrow,” Madara said, his voice muffled by the blankets. “Make it with red bean.”
A small, almost imperceptible smile touched Tobirama’s lips. He set down his tools. “Your sodium intake is already too high.”
Madara peeked out of his cocoon, a single, baleful Sharingan eye fixing on his husband.
Tobirama sighed. “...But, as a concession for the... thermodynamic incident involving proprietary fuuinjutsu, I will consider it.”
Madara grunted again, a sound of supreme victory, and burrowed back into his warmth. Across the room, the village’s greatest inventor, a man who had reshaped the very fabric of shinobi life, returned to his schematics, already designing a new, better, and almost certainly more dangerous way to make their lives 'easier'. And in the quiet hum of their shared retirement, the world was, for a moment, perfectly in balance.