"Burn, burn, burn for me!" Beneath the shade of a tree, Sora muttered incessantly while clutching a leaf.
With a sudden crackle, the leaf in his hand spontaneously combusted.
Having succeeded once, he tried again, infusing another leaf with Chakra, and achieved the same success.
"Finally, I've succeeded. My Chakra has undergone Nature Transformation. Now it's time to see if the theory Mom and I researched actually works."
Sora impatiently mobilized the Chakra within his body.
The previously attribute-less Chakra suddenly became scorching hot.
If anyone had witnessed this scene, they would have surely cursed Sora for being an idiot.
Attempting Chakra Nature Transformation inside one's own body was incredibly dangerous, even with the gentlest Water Nature Transformation.
The body's meridians were exceptionally fragile; a single mistake could lead to severe injury at best, or becoming a cripple or even dying at worst.
However, Sora had the confidence to do so.
Over the days spent learning Nature Transformation, his Chakra control had improved once again, reaching a level infinitely close to Shizune's.
In terms of Chakra control, even an ordinary Jonin might not be more skilled than him.
Consequently, Sora could achieve the most powerful ninjutsu with the minimum amount of Chakra consumption.
Thus, even if his Chakra reserves weren't vast, they were enough for him to use freely.
"Chakra like fire, blood like steel, forge for me!"
Sora intended to strengthen his Vitality and, in the process, continuously enhance his control over his own blood.
He wanted to develop a technique, or perhaps even a Bloodline Limit, to control the moisture or even the blood in others' bodies.
If he couldn't even control the blood in his own body, how could he have the ability to control others?
Sora aimed to use Chakra infused with Fire Nature Transformation to temper his own Vitality, making it grow as vigorous and powerful as a flame.
Chakra was originally a form of energy, a combination of physical and spiritual energy.
It could be said to be the most nourishing substance, though using it this way meant it had to be re-refined and wouldn't recover naturally.
But Sora didn't care about that. Since he had hit a bottleneck and couldn't refine more Chakra anyway, the worst-case scenario was simply refining it all over again.
"So hot!"
Sora felt as if he had fallen into a furnace. His entire being felt like a piece of fine gold being continuously tempered.
This was a method for tempering Vitality specifically designed for someone like him with a dual Fire-and-Water constitution, which he and Tsunade had researched.
He felt his body's Vitality steadily decreasing under the tempering of the high-temperature Chakra, as if he were being bled.
His face, which should have been pale from the lack of blood, was instead flushed red due to the intense heat of the Chakra.
"No, it really is too much of a strain. Fire alone is too extreme; it must be combined with water. I have to master both Nature Transformations and use them simultaneously!"
Sora felt as if his entire body was enveloped in flames, his skin turning bright red.
At that moment, a jade-like hand pressed against his shoulder, and Chakra filled with life energy began continuously repairing the damage caused by the high-temperature Chakra.
"You... sigh, I really don't know what to say to you. Didn't we conclude our research by saying we'd use Fire Nature Transformation Chakra to temper Vitality while using Water Nature Transformation Chakra to protect the body and blood, assisting in the control of the fire to reach a realm of harmony between fire and water? You've only just mastered the Fire Nature Transformation and you're already acting so recklessly."
Tsunade spoke crossly.
To be honest, she was quite surprised by Sora's bold hypothesis.
Although she had helped finalize the method, the core concept was something Sora had come up with himself.
She had merely assisted in perfecting it, using her own experience to compensate for his lack of it.
When they first researched this method, she had been shocked.
She hadn't expected that the hypothesis Sora made years ago would actually be put into practice by him today.
"I just wanted to see if our research was correct. Mom, look at my body." Sora felt a mix of anticipation and nervousness.
His haste was driven by the desire to see whether his method was flawed.
If it wasn't, then even pure fire tempering should show some effect, though it wouldn't be as good as the harmony of water and fire.
"Your Vitality is severely depleted. Clearly, the Fire Nature Transformation Chakra from just now evaporated a lot of your blood. Wait... how can this be? Your Vitality—"
Tsunade spoke calmly at first while checking him, but her expression soon turned to surprise. After a moment of contemplation, she continued.
"Although your Vitality is severely depleted, the remaining Vitality is incredibly concentrated.
If you can fully replenish what you lost and make all your Vitality like this, your physical fitness will improve again.
At that time, it's very likely you'll break through the shackles of a Genin and step into the Chunin level."
"That's great! This proves our research direction was correct. This method really can temper Vitality," Sora said.
"Don't get too ahead of yourself. The path is correct, but it lacks the gentleness and nourishment of water. Tempering with fire alone is too extreme; one mistake and you could die from Vitality depletion.
So until you master Water Nature Transformation, you absolutely cannot do this again. Now what you need to do is replenish your depleted Vitality."
As Tsunade spoke, she actually pulled open her clothes and pressed Sora's head toward her.
Sora, familiar with the routine, held onto Tsunade.
"Lucky you. You're this old and you still take advantage of your mom. You're truly a child who won't grow up!"
Ten minutes later, Tsunade covered her majestic figure again, straightened her clothes, and spoke to Sora with mock annoyance.
"Wasn't this your own invention, Mom? There's no food that can compare to this."
Sora was a bit embarrassed at first, but then he thought that since he had grown up on this and even Tsunade wasn't self-conscious, why should he be?
Ultimately, Tsunade was doing this for his own good and had sacrificed much for him.
Truth be told, this was much faster than drinking nutrient solutions, though it depended on who the source was.
Only someone like Tsunade, with the Senju Clan physique and being a Kage-level expert with terrifyingly vast life force, could produce such an effect.
Otherwise, Sora's body wouldn't have developed so well.
For an ordinary person from Earth to have their body grow to such a level in such a short time was inseparable from Tsunade's nourishment.
"Of course. Mine is unique," Tsunade said narcissistically.
She was clearly very proud of the method she had devised.
If viewed without any impure thoughts, this was indeed a very suitable method for Tsunade and Sora.
Furthermore, Sora had been raised on this since he was a child, a natural process for humans, so he had no impure thoughts.
It was just that he required it for a longer period and still did it frequently even as he grew older.
Seeing how Sora had transformed from someone with a terrible physique into having such a monstrous body in a short time.
It was clear that Tsunade's method was indeed effective, and her contribution was indispensable.
...
Author's Note:
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