Inside the laboratory.
Senju Tobirama was unaware that his actions had just been witnessed by Senju Hashirama and Uchiha Madara.
Tobirama skillfully placed Renye, whom he held in his arms, onto the experimental table, then secured his limbs to prevent muscle reactions during the experiment.
After completing all of this, Senju Tobirama looked at the unconscious Renye with satisfaction and pulled out the "Uchiha Observation Manual" from his Pregnant.
The page he opened read:
"Rebellious Shadow Clone?"
Ever since Renye learned the Shadow Clone Jutsu, the Shadow Clones he created have been problematic to varying degrees.
While they had no impact in combat, they exhibited serious issues in daily behavior.
Sometimes, they were so rebellious that they would voluntarily dispel themselves.
Most importantly, Renye's Shadow Clones showed him absolutely no respect!
They called him 'old man' without any respect whatsoever!
They were even more evil than those wicked Uchiha!
Senju Tobirama once asked Renye about this, and the boy claimed he didn't know, stating it had been this way since the very first Shadow Clone he summoned.
Even for a knowledgeable master of forbidden jutsu, this was the first time he had encountered such a situation.
He had been busy researching other matters before and didn't have time to deal with the Shadow Clone issue.
This time, he specifically brought Renye in to clarify this matter.
Senju Tobirama leaned in close to observe Renye, rapidly scribbling notes in his notebook.
"This kid's physical fitness is getting stronger and stronger."
"It seems my initial hypothesis was correct; his physical functions have indeed improved significantly."
"I wonder if he can eventually catch up to Big Brother?"
After discovering the secrets of the Senju and Uchiha, he wondered if the fusion of their bloodlines would lead to changes?
So, Senju Tobirama secretly conducted a series of experiments, studying his own blood and Renye's blood samples.
He did indeed discover that the fusion of the two bloods—
Could make body cells more active and powerful than before the fusion.
The accelerated cell division enhanced physical recovery and mental strength, and the Chakra volume was extraordinarily vast.
Far exceeding that of ordinary Senju and Uchiha clan members.
After long-term observation confirmed no danger, he secretly injected some of his own blood cells into Renye's body.
This was the reason for the significant changes in Renye's body over the years…
As the experiment continued, Senju Tobirama was shocked to find that the cells in Renye's body were slowly increasing in number each year!
Perhaps it wouldn't take many years.
Renye could reach the same level as Big Brother.
What shocked Tobirama even more was that—
Those divided cells could also produce new cells to continue dividing!
Cell division producing new cells…
This meant that Renye's body would age much slower than usual.
According to his estimations, Renye's lifespan could reach between one hundred and one hundred and twenty years.
These cells were still slowly increasing year by year, and it was still unknown how long he would ultimately live.
Upon learning of the changes in Renye's body, Senju Tobirama realized he had personally created a monster.
His first thought at the time was to kill Renye.
If this kid continued to grow, he might very well become a second Uchiha Madara!
Uchiha clan members' minds were prone to extremism, and if Renye were to go astray one day, almost no one in the Ninja World would be able to stop him.
Although reason told him to nip the danger in the bud, looking at the unconscious Renye, he ultimately gave up.
By then, he had spent several years with Renye and had long since accepted this Uchiha brat in his heart.
Naturally, he couldn't bear to kill him.
Ultimately, this matter was caused by him, and this Uchiha brat was innocent…
Senju Tobirama decided to teach this child well and absolutely not let him go astray.
If Renye were to take an extreme path one day, he would personally end his adopted son's life!
Fortunately, after ten years of living together, Renye had never caused him any worry.
This kid not only loved the Village and cared for his comrades, but his cooking was also delicious, and he had made great contributions on the battlefield, becoming a perfect Hokage successor.
He was very glad he hadn't killed Renye back then; this kid was truly different from other Uchiha.
His thoughts drifted back to the present, Senju Tobirama looked at the unconscious Renye, a slight smile on his lips, "You really didn't disappoint me, kid."
Saying this, he continued to write down the unfinished data.
Upon observation, he found that it was likely Renye's mental strength that had issues, leading to the rebellious thoughts in his Shadow Clones.
This kind of problem was very rare, so much so that Tobirama wondered if the kid's mental strength had always been problematic?
Or did the problem only appear after the experiment?
Currently, there was no specific solution; he could only wait until daytime to ask the kid.
He would see if the problem could be resolved then.
Senju Tobirama glanced at the time, it was still early, and the sleeping potion's effect was still ongoing, so he prepared to continue observing the cell division.
He unbuttoned Renye's shirt, revealing his defined muscle lines, and took out a syringe to draw a small amount of blood from his chest.
As soon as the needle was pulled out, the puncture wound healed instantly.
Senju Tobirama redressed Renye and, holding the syringe, turned to the experimental table.
…………
In the dense forest at the edge of the Senju Clan Land, Senju Hashirama and Uchiha Madara were hidden behind a tree.
"Where exactly did Tobirama take that child?" Uchiha Madara was growing impatient. "Why aren't they back yet?"
They had waited for several hours, and it was almost dawn, but they still hadn't seen the two return.
Madara was already displeased with Tobirama, and now he felt even more that the other party had malicious intentions.
That guy was definitely doing something shady.
"Madara, don't be impatient," Senju Hashirama said with a hearty smile, trying to ease the atmosphere. "Tobirama should be back soon."
"Renye is Tobirama's adopted son; he would never do anything to harm Renye…"
Before he could finish, Madara coldly interrupted him.
"Of course you trust him. But don't forget, he is Senju Tobirama, the guy who distrusts the Uchiha to his very core."
Although he didn't care about these clan members, he was still dissatisfied with Senju Tobirama's actions.
After all, he himself had been guarded against by Senju Tobirama quite a bit back then.
That feeling made him very uncomfortable!
"Madara, calm down, something like that won't happen," Senju Hashirama quickly reassured his close friend, worried that he would get impatient and choose to leave the Village.
He had finally managed to coax Madara over; he hadn't even tasted Renye's cooking yet, so how could he be willing to leave just like that?
Even if he had to go, he should at least eat first, right?
He had been craving this for two years.
Uchiha Madara snorted and began to close his eyes and rest.
Just then, faint footsteps were heard in the distance.
Senju Tobirama was seen carrying the unconscious Renye, slowly walking towards the Senju Clan Land.
He was completely unaware of the two people hidden in the forest.