Who knew how much time had passed.
Raien was enjoying his rare moment of sage time.
And Mikoto—unable to refuse him—continued to give him a gentle massage.
The bedchamber was filled with an ambiguous, slightly oppressive atmosphere.
Mikoto straddled him.
Her loose kimono was half-covered and half-revealed, her fair skin glowing softly beneath the dim lamplight.
Raien's hand rested lazily on her slender waist, carrying the calm satisfaction of someone who believed everything was firmly under control.
At that subtle moment—
Outside the heavy, intricately carved wooden door of the bedchamber, a clear, youthful childish female voice suddenly rang out without warning:
"Aunt Mikoto… are you inside? Have you seen Big Brother…?"
The voice was crisp, lively, and unmistakably familiar.
Like a splash of cold water, it instantly shattered the sensuous atmosphere in the room.
Uchiha Mikoto stiffened violently.
Like a startled rabbit, she abruptly sprang off Raien.
Her movements were so fast they almost left afterimages.
In her panic, she grabbed the loose kimono that was slipping from her shoulders and hastily wrapped it around herself, trying desperately to conceal the shameful marks left on her body.
Her cheeks instantly burned red, her eyes filled with embarrassment at being discovered.
Raien was momentarily stunned by the sudden interruption—
but then he found it amusing.
He watched Mikoto clumsily pull her clothes tight.
His gaze swept over the faintly visible fair skin she hadn't managed to fully cover in her haste.
A realization dawned on him.
No wonder Mikoto's kimono always felt "empty" inside when she wore it.
It was clearly designed for his convenience—
so he could "favor" her at any time.
That thought made the corners of his lips curl upward with a playful, triumphant smile.
"It's Hikari," Raien said calmly, his tone deliberately gentle.
"I'm here. Come in."
The door was pushed open.
A slender figure stepped inside.
She was around eighteen years old, her youthful features still carrying a hint of softness, but her figure already fully developed.
She wore a fitted dark-purple short kimono that hugged her curves just enough to be provocative without being excessive.
Her long black hair flowed smoothly down her back, the ends slightly curled.
Her face was exquisitely delicate, like finely sculpted porcelain.
Large, obsidian-like eyes shimmered with clarity and intelligence, no longer innocent—
but sharp, aware, and unsettlingly calm.
Beneath that beautiful exterior, there was something deeply contradictory.
A trace of world-weariness and cold indifference flickered occasionally in her gaze—
utterly incompatible with her youthful appearance.
That contrast created an overwhelming presence.
Dangerous.
Captivating.
She was Uchiha Hikari.
After Raien ascended the throne, he had spared no expense.
Using the vast resources of the Land of Fire, he scoured ancient records, excavated forbidden ruins, and hunted legends across the entire ninja world.
He even mobilized his eight hundred death guards for a carpet search.
Finally, in an ancient sealed land hidden by time and powerful barriers, he found her.
Breaking through seals jointly laid down long ago by the ancestors of the Senju Clan and the Sarutobi Clan, Raien personally shattered the prison that had bound her for years.
He pulled this forgotten Uchiha "weapon" out of the cold darkness beneath the earth.
When light once again entered Uchiha Hikari's eyes after years of confinement, Raien was the only figure she saw.
From that moment on, he became her salvation.
Her anchor.
Her absolute reliance.
And in return, Raien gained his greatest trump card—
a weapon powerful enough to challenge Konoha itself, and even cast its shadow over the entire ninja world.
No one understood better than him what kind of world-destroying power slept within this seemingly delicate young woman.
That terrifying pupil power, born from the deepest layers of the Uchiha bloodline, was an ultimate weapon capable of making any enemy tremble.
Uchiha Hikari walked toward the bed.
Her nose twitched slightly, as if catching a familiar scent.
Her sharp eyes shifted between Raien and Mikoto.
Then she sniffed again.
Immediately, understanding flashed across her face—
followed by clear displeasure.
"…This smell."
She tilted her head slightly, lips pursed.
Her gaze darkened, irritation surfacing plainly.
"You two were just… doing something fun again."
Her tone was accusatory—
not childish, but openly dissatisfied.
She stepped closer to Raien, looked straight at him, her eyes full of grievance.
"Why didn't you call Sister Izumi? And why didn't you call me?"
Her brows knit together.
"Does Big Brother only like Aunt Mikoto now? What about me?"
Her arms crossed under her chest, emphasizing her curves, her expression unmistakably jealous.
She looked exactly like someone whose territory had been violated.
Raien and Mikoto exchanged a brief, helpless glance.
Under Raien's obsessive care and the resources he poured into her, he had tried to compensate for the years Hikari had lost while sealed away.
As a result, she had regained much of the emotional expression she should have had—
but she also became extremely dependent on him.
That dependence gradually twisted into an almost pathological possessiveness.
Any intimacy Raien shared with another woman, in her eyes, was a betrayal that demanded compensation.
Uchiha Mikoto reacted immediately, her face still flushed.
She waved her hands in panic and unhesitatingly shifted the blame.
"Hikari, Aunt Mikoto didn't steal anything! It was His Majesty… he insisted…"
Her voice grew softer and softer, filled with helplessness and shame.
Raien looked at Hikari's eyes—
sharp, resentful, and filled with a very clear message: You're biased. You don't care about me anymore.
A headache instantly formed.
If he failed to placate this woman, the consequences might be even more troublesome than Konoha launching an attack.
Raien let out a silent sigh.
Sometimes, ruling an empire felt easier than managing his own household.
...
Author's Update 18+ 📢
The fanfic Naruto: Raised by Kushina, Took His Brother's Wife – Part 1 is now officially fully completed!
It is now available on Patreon for all tiers, including the lowest Tier 1.
The complete Part 1 has been uploaded on Patreon.
📚 Category: Naruto 18+
🔗 patreon.com/Shadow_demon_007
Thank you all for your continuous love, support, and patience for this story 💙