"Yin Seal: Release!"
Tsunade was absolutely right.
With so much chakra allocated to the wood clones learning the sealing techniques, Kiyoshi had less than thirty percent of his own chakra left, prompting him to decisively release the Yin Seal.
For days, with his extraordinarily rapid chakra recovery, he'd been filling the pool within the Yin Seal, accumulating a substantial amount of chakra.
It was now more than ten times his usual full capacity.
Enough for him to indulge.
"Multi Wood Clone Jutsu."
In a deserted forest.
Kiyoshi whispered the words.
With a swish, a dense growth of wood vines sprouted, forming over a hundred wood clones instantly.
"Everyone, for the sake of our wonderful future… I leave the rest to you."
He drew nearly all the chakra from the Yin Seal in one go.
Each wood clone was given twenty percent of his maximum chakra, far more than the ones left at the inn to practice the simple sealing jutsu.
This power was roughly 3 times that of Tsunade and infinitely more than Kakashi's.
This wasn't the feeble, flimsy shadow clone method that Naruto would use in the future when training as the Nine-Tails Jinchuriki.
If he wanted, Kiyoshi could create thousands of wood clones, but that wasn't necessary.
For him, the most ideal training model was to maintain a powerful and chakra rich clone.
"This is the Flying Thunder God Jutsu formula. Follow it for your training."
He carved a symbol onto a large tree, turning to address the numerous clones before him.
"Every ten minutes, we'll enter the shared training mode to consolidate and exchange our Flying Thunder God progress."
This was Kiyoshi's unique "Shared Training Mode," developed over the past two years.
His real body acted as a memory bank, allowing the clones to upload memories, experiences, and insights without dispelling.
This information would be stored, filtered, and corrected by his main body, then redistributed as filtered information to the clones.
In this way, the clones trained with unified guidance, avoiding mistakes, while he analyzed and processed the data to optimize their training further.
This method maximized efficiency and minimized chakra loss, capitalizing on Kiyoshi's advantage to achieve peak training effectiveness.
Only someone with Kiyoshi's abilities, a man who had lived two lives, wielding the Eternal Mangekyo Sharingan with overwhelming spiritual strength, could handle such an immense influx of information.
Anyone else would be exhausted after the first attempt to share and consolidate information.
Even Naruto, with his Sage Body and Nine-Tails chakra, could handle physical exhaustion in the short term but not mental fatigue. For him, conventional training would be better.
Kiyoshi developed this shared mode not only for training ninjutsu and forbidden techniques but also to aid in the development of new ones.
The wood clones became his efficient assistants.
"No problem!"
"Leave it to us!"
"Rest up, boss!"
The wood clones were full of energy, eagerly replying as they started practicing the Flying Thunder God Jutsu.
They began with the basic formula and time passed steadily as they repeatedly shared information, progressing at a surprising rate.
In less than an hour, the first stage of the Flying Thunder God was fully mastered.
"Poof!"
Kiyoshi, digesting the success data from his clones, vanished on the spot, reappearing before one of the clones with a space-time mark.
"Perfect! Now, on to mastering the second stage of the Flying Thunder God."
He was overjoyed, ordering the clones to continue.
With most ninjutsu he'd learned, Kiyoshi mastered them quickly without much effort, so he hadn't used shared mode for jutsu practice.
He mainly used the clones to study the insights and notes on secret and forbidden techniques from the Uchiha clan's archives.
This approach had already benefited him greatly, building a solid foundation over the past two years.
However, he underestimated the efficiency of this shared training mode.
---
Back at the inn.
Tsunade had returned to her room, feeling a strange mix of anxiety and impatience.
"Can that brat really pull it off?"
Gazing out into the dark night, Tsunade muttered, "It's impossible. The Flying Thunder God isn't just any jutsu; this space-time jutsu has only ever been mastered by granduncle, and Minato.
Even if Kiyoshi has a knack for it, there's no way he'd learn it so quickly."
"Besides, if he completes the training, he'll be so exhausted he won't even be able to stand."
Recalling his once mischievous hands, a blush crept across her face.
He wasn't that little kid from two years ago anymore—he'd grown up, too quickly.
In her room, Tsunade's thoughts were a storm of hope and apprehension. As his teacher, she wanted Kiyoshi to succeed, but a part of her dreaded losing their bet.
With him growing daily, he'd become irresistible. If they spent too much time alone together, she worried she'd cross the line.
"Just five more minutes."
Looking at the clock as it neared nine, she exhaled in relief. "Looks like he failed."
But then, without warning—
A kunai shot through the window.
Tsunade tensed up, her sharp gaze alert.
The next moment, a black figure blurred in, catching the kunai with the special formula.
"Kiyoshi?"
She stared, stunned, at the familiar, beaming face in front of her.
At some point, this brat had grown taller than her.
"Was that… the second stage of the Flying Thunder God?"
Though she hadn't mastered the jutsu, she knew enough about it.
The first stage involved using a fixed space-time mark for teleportation. The second stage required throwing a kunai with the formula, then instantly moving to it to attack.
The difficulty spiked tremendously between the two stages.
Yet Kiyoshi had mastered both stages in under three hours.
It was unbelievable.
"Hehe… don't compare me to others, Tsunade-nee." Kiyoshi threw his arms around her, hugging her close.
He looked into her face with eager anticipation. "No backing out on our bet now."
Looking at his radiant smile, though slightly tinged with exhaustion, Tsunade felt her heart soften.
She sighed, gently pinching his cheek. "You brat, when have I ever backed out?"
---------------
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Extra Chapter~
Early morning.
On the tatami mat.
Tsunade woke up.
Rubbing her sleepy eyes.
She looked down at the certain someone nestled unceremoniously in her arms.
Grabbing the mischievous hand that wouldn't stay still, she couldn't help but roll her eyes.
In a soft yet exasperated tone, she muttered, "You brat, holding me all night wasn't enough? Show some restraint."
Yet a faint blush spread across her cheeks.
From the very start, she hadn't felt entirely comfortable.
But Kiyoshi's warm embrace made her feel immensely safe and comforted.
She even found herself not wanting to leave, secretly wishing that the night would last just a bit longer.
Especially, given that strange experience in her dream.
It dawned on Tsunade then, she was no exception to desires and emotions; she was, after all, a woman too.
"Good morning, Tsunade-nee."
The mischievous hand retreated.
Kiyoshi, his head still buried in her warmth, murmured, "It's true—only Tsunade-nee's warm and open embrace can give me peace."
"You little pervert."
Tsunade sighed, a little helpless.
She steadied herself and spoke in a more serious tone.
"Kiyoshi, now that you're in adolescence, it's normal for you to feel curious about the opposite sex. You're only drawn to me because of your hormones."
"Just remember, I'm not only your teacher, but I'm much older than you—basically an old lady at this point."
At that moment, a flicker of sadness crossed her eyes.
Inwardly, she couldn't help feeling a touch of bitterness and regret.
Having never experienced love herself, yet because of Kiyoshi, she had experienced a taste of it in her dream.
And, fatefully, at the wrong age, encountering someone who was far too perfect.
While she wasn't exactly head over heels in undying love with him, Tsunade had to admit, she didn't dislike his closeness.
In fact, she wondered if years of bottling up her emotions had left a part of her yearning for just a bit of release, a little madness.
Yesterday, she had uncharacteristically not chased this impertinent kid away.
And that shameful dream served as undeniable proof.
Was it simply the recoil from suppressing her feelings too harshly?
"Don't say that, Tsunade-nee, you're not old at all."
Kiyoshi looked at Tsunade's beautiful face.
Even her skin looked like that of an eighteen year old girl, showing no signs of aging.
He smiled, "And if no one else knows your abilities, I certainly do."
"With your medical ninjutsu skills and the Yin Seal, you could preserve your youth indefinitely."
"If you wanted, you could extend your life significantly. Maybe a thousand years is pushing it, but living a hundred or two hundred years would be no problem."
Talk of eternal life might sound like fantasy now.
But he wasn't wrong.
Tsunade, right now could already maintain her youthful appearance with ease and if she truly wanted, she could likely exceed normal human life expectancy with a little extra time and effort.
"And, Tsunade-nee, what kind of beautiful dream did you have last night?"
Kiyoshi's gaze held a hint of laughter as he gently poked the corner of her mouth, which still glistened slightly.
"You were even drooling."
"Last night?"
A jolt ran through her.
Recalling that absurd, unspeakable dream, Tsunade, despite her extensive medical experience and maturity, felt her face flush bright red, as heat rose in waves.
"You brat, get out of here."
Before Tsunade could throw a punch, Kiyoshi had already turned into a blur.
Disappearing from the room using his newly mastered Flying Thunder God Jutsu.
"Great."
Tsunade's face shifted through a mix of expressions.
Finally, she sighed deeply.
Covering her face, she muttered, "How shameful!"
The odd reaction of her own body which Kiyoshi had clearly noticed long ago.
Though he teased her, he still respected her dignity and spared her from unwanted embarrassment.
"Thanks to this, I'll probably never be able to shake off that brat again."
However, Kiyoshi's words had taken root deep within her heart.
Everlasting youth—technically, she had already achieved that.
As for age? Immortality might be a stretch, but surpassing a typical human lifespan…
For her, it didn't seem… all that impossible.
"No, no!!"
"I can't let that brat get under my skin."
"I'm his teacher, after all! That brat with those impure thoughts!"
...
Meanwhile, in the next room, Kiyoshi's figure appeared.
"Tsk tsk, who would've thought that a woman like Tsunade-nee could be so affected by a dream." Remembering Tsunade's reaction, Kiyoshi smirked.
Last night, Tsunade had most likely had some pleasant dream.
Even her long-suppressed body had shown a strong response.
Looking at the wood clones that had just about finished learning those sealing techniques, Kiyoshi took a deep breath, and reclaimed each one.
"Ha!" A surge of experience and memories poured in.
Had it not been for Kiyoshi's restful night, having fully recovered from the fatigue caused by using multiple wood clones to train with the Flying Thunder God Jutsu, he'd likely be exhausted right now.
This was more than just practicing a single jutsu together.
They had been working on multiple distinct, high level sealing techniques.
Some were even S-rank.
"It seems that as I age, my mental strength is only getting stronger."
Standing silently with eyes closed, he processed the influx of information.
Relaxing his mind a bit, Kiyoshi smiled faintly, "If this were before, I'd be exhausted on the spot."
"And with the Wood-Wood Fruit combined with the Senju lineage's perfected Yang Release, plus the Eternal Mangekyo Sharingan's flawless Yin Release."
His eyes sparkled.
Gazing out at the rising sun through the window, he clenched his right fist tightly.
"In a few years, when I fully master the powers of Yin and Yang, I might not even need the chakras of Indra or Asura to awaken the Rinnegan."
In his view, the Rinnegan's awakening traditionally required the chakras of both Indra and Asura.
But ultimately, it was simply the combination of the Sage's Yin eye and Yang body.
If he could fully control and empower both abilities, the fusion of both could naturally bring about an incredible transformation.
Granting him the legendary Rinnegan of the Sage of Six Paths.
And Kiyoshi surmised, this transformation would involve more than just a boost in his eye power.
It might signify a total, unprecedented metamorphosis.
A far cry from merely transplanting someone else's Rinnegan.
---------------
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