After Kushina was injected with the Extremis virus and Hashirama cells, her constitution became incredibly powerful.
Her recovery ability, strength, and speed were already top-tier in the ninja world, and now, with Kain's further enhancements, she was formidable even without relying on chakra—comparable to the level of Tsunade's strange power.
But after receiving the Shock Fruit serum, Kushina surpassed Tsunade by a wide margin.
Kain took her to the seaside to test out her new vibration ability. Without using her full strength, Kushina was able to shatter the sea in front of her like broken glass with a single punch, easily creating a 100-meter-high tsunami. The shockwaves from her attack traveled several kilometers away.
It wouldn't be an exaggeration to call her a humanoid nuclear bomb.
Kain silently calculated in his mind: even if Nagato had fully mastered all of the Rinnegan's powers, he would likely only be able to hold a stalemate against Kushina. And that would only be if she were being careless and not using her perfect Jinchūriki mode.
Even Kain himself would only be able to match her in terms of raw physical strength or chakra, or rely on the trickiness of his magic to find her weaknesses.
But when Kushina uses her full Jinchūriki powers, her speed is almost comparable to space-time ninjutsu—and she has a malicious radar-like perception.
"Damn… I've powered up Kushina this much without even telling her about Tsunade and Yoko."
Kain felt a sudden weight in his heart. He wanted to believe in Kushina's kindness and understanding, but he also knew that once she found out—especially about the child Tsunade had—she'd probably punch him to death.
"What's wrong?"
Kushina blinked her bright blue eyes at him. Kain's heart trembled for a moment, but he replied calmly:
"I was just thinking… Now that you're this strong, our next child will definitely inherit all our best traits."
"C-Children and stuff... geez, why are you talking about that here?"
Though Kushina had already given birth, her lively and endearing personality still gave her a unique charm.
Her flustered reaction made Kain smile to himself. This might be the perfect moment to bring up Tsunade—when Kushina was at her happiest.
Making up his mind, Kain suddenly hugged her tightly and said with a gleam in his eyes, "Kushina, let's go back."
That evening, Kain prepared a luxurious meal for Kushina and Naruto himself.
Since returning, Naruto had abandoned his so-called "happy childhood." Over a dozen elite guardian ninjas now trained him for at least six hours every day.
For most children, this would be unbearable. But Naruto had inherited both Kain and Kushina's genes—his potential was monstrous. Even twelve hours of training wouldn't be too much for him.
Still, as his father, Kain didn't want to be too harsh. He allowed Naruto plenty of rest—but secretly told the guardian ninjas to keep pressuring him to train harder, with the added nudge of saying, "Lady Kushina ordered it."
It worked like a charm.
Naruto had become closer to Kain than ever. He often made faces at Kushina while curled up in Kain's arms.
Kushina would get so mad that she'd summon her adamantine chains to discipline Naruto on the spot, while Kain watched with a smile, stepping in to calm things down.
The outcome was always the same.
Then he'd stop Kushina like a sneaky weasel. Both mother and son were hopelessly naive—if the guardians didn't say anything, they'd never notice the manipulation.
After Naruto finally fell asleep, it was time for Kain's true plan.
Even with all her enhancements, Kushina's stamina in that area still wasn't on Kain's level.
Kain could use electromagnetic force to heighten Kushina's sensitivity. No matter how strong her physical endurance was, she couldn't compete with him in this particular aspect.
Over an hour later, Kushina lay weakly in Kain's arms, her mind blank—as if she had returned to the feeling of her very first time.
Seeing the timing was right, Kain cautiously said, "Kushina, I have some news about Tsunade."
"Tsunade? What happened to her?"
Kushina responded between shallow breaths, answering almost instinctively. She paused for a few seconds afterward, trying to catch her breath.
"She gave birth to a child, which is why she never returned to Konoha."
"A child? Why would that stop her from going back to Konoha...? Miss Tsunade—"
Kushina trailed off mid-sentence as realization began to dawn on her. Her bright blue eyes turned to Kain, narrowing suspiciously. "Whose child is Tsunade's?"
Kain remained silent.
Kushina's face twisted with rage. "You bastard!" she snapped, attempting to get up.
But Kain acted swiftly. Using his deep knowledge of Kushina's body, he pinned her down with practiced precision.
"You asshole... Kain, I won't forgive you!"
"Idiot! Stop it—stop it, stop it!"
Kushina let out a loud scream, and Kain finally eased his pace. Then he asked tentatively, "Kushina, about Tsunade—"
"You bastard, Kain! I won't forgive you!" she growled and tried to bite him, but Kain was faster and moved again.
"Stop it, bastard Kain, let me think about it..."
"Bastard boss, stop! I... I forgive you!"
Kain finally felt a small sense of relief. He slowed down further and said cautiously, "Kushina... and Yakushi Nonō... at that time, I..."
Kushina, breathless, gasped, "You bastard... ugh..."
By dawn, Kushina had finally forgiven Kain—then promptly fell into a deep, exhausted sleep.
A few days later, Tsunade arrived with Yoko. Seeing Kain's guilty expression, she couldn't help but laugh.
"You already told Kushina, didn't you?" she asked amusedly.
Kain sighed. "Yeah, I told her... She's still a bit angry, especially about Nonō. But I'll give her time to calm down."
Tsunade scowled and gave him a light kick. "Still sighing? This is all your fault."
The kick wasn't painful—it was more like playful banter between husband and wife.
Tsunade was now preparing to return to Konoha with Yoko. As a Konoha shinobi, she couldn't stay away forever—she needed to report back to the village and to Nawaki after her two-year absence.
Kain, meanwhile, had to discuss plans with Nawaki about relocating the village.
The new Leaf City near the capital was already under construction. At the current pace, the migration process would begin in about six months. Policies for relocating both ninja and civilians had been finalized and announced.
For any ninja who refused the relocation, proper measures would be taken.
Originally, the three of them could have used Apparition or the Fire Dragon spell to return quickly, but Yoko wanted to enjoy the scenery along the way. Since she had rarely left the small town she grew up in, Kain and Tsunade decided to let her take her time.
Eventually, when Yoko became tired, Kain teleported them directly to the Hokage Building in Konoha.
Their sudden appearance startled several passing ninja, who gasped in alarm—then relaxed once they recognized the visitors.
"Lady Tsunade?!"
"It's really her! Lady Tsunade has returned!"
Excitement rippled through the crowd.
Tsunade—legendary Sannin, master healer, and the most beautiful woman in the ninja world—held enormous prestige in Konoha.
The shinobi were elated. They assumed she had been on a long-term classified mission and was now finally back after its completion.
Without lingering in front of the Hokage building, Tsunade took Kain and quickly headed inside. When they arrived at the Hokage's office, Nawaki and Hyuga Hiashi—who were busy reviewing documents—were stunned by who entered.
"Sister? You're back!?"
Nawaki asked, visibly excited. For a long time, he had feared something terrible had happened to his sister.
If he hadn't gone to the Shikkotsu Forest himself to confirm her safety—and been comforted by Orochimaru—he would've surely mobilized a large force of Konoha shinobi to track her down.
"Sister, where have you been all this time? Why haven't you returned to Konoha?"
Nawaki fired off a string of questions. But before Tsunade could respond, Hyuga Hiashi's sharp eyes shifted toward Kain—and the little girl in his arms. She had pale golden hair, and her face resembled Tsunade's too closely to ignore.
Hiashi seemed to grasp the truth at once. Without a word, he bowed slightly and interjected:
"Nawaki-sama, Tsunade-sama, Daimyo-sama, I just remembered some urgent clan matters. I'll take my leave now."
Then, without waiting for a response, he exited swiftly—discreetly signaling the surrounding Anbu to stay away and ensure no one disturbed the Hokage's office.
Seeing this, Kain couldn't help but mentally praise the Hyuga clan's insight. As expected from the Byakugan—Hiashi uses it more for reading people than battle.
Now, with only four people left in the room, Tsunade began explaining her whereabouts over the past two years.
Although she hadn't said anything to Orochimaru directly, someone as sharp as him had surely figured it out.
In fact, Tsunade had met Orochimaru once during her time away. He had asked if she intended to return to Konoha—but back then, she had refused.
Now that Nawaki finally knew the full story, he tried to accept it. Even though the smile on his sister's face was genuine, as her younger brother, it was hard for him to simply forgive and forget.
Boom!
Tsunade lightly punched Nawaki on the head with her usual strange strength and snorted, smiling:
"I'm back. Don't overthink it."
"Y-Yeah, I understand, Sister…"
Nawaki said, rubbing his head. He felt that all-too-familiar force behind her punch and sighed inwardly, deciding to let it go.
When Kain brought up the topic of Konoha's relocation, Nawaki's attention immediately shifted. He had inherited the First Hokage's deep love for the village, and anything that benefited Konoha naturally became his top priority.
…
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