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It was silent all night.

Early the next morning, Tsunade yawned as she walked out of her house. She went to the lake and stretched, highlighting the beautiful body curve.

She read at night with the light on and just finished reading all the content in the scroll, and only slept for less than four hours.

'That bastard, will not have such perseverance.'

Thinking of this, Tsunade was a little proud and looked at the next house.

To her surprise, Kisame got up earlier than her, only to look at the huge body of Katsuyu.

Something is wrong with this guy.

Tsunade frowned when she saw him. In fact, she noticed yesterday that after Kisame saw Katsuyu's body, he became a little strange.

"Hey, what are you looking at?"

She walked to Kisame and asked with a puzzled face.

Kisame didn't turn his head, he continued to stare at Katsuyu and said, "Don't you think the slug sage is beautiful?"

"?!"

Tsunade pupils expanded, and her expression was full of shock and confusion.

'Beautiful?'

It was very difficult for her to understand how Kisame found Katsuyu beautiful.

Ordinary people will instinctively feel fear and disgust when they see such a behemoth. Tsunade is very familiar with Katsuyu, but at most she thinks that Katsuyu is more cute than beautiful.

Kisame seemed to see the doubts in Tsunade's heart, he finally turned to look at her, and said with bright eyes:

"Big is beautiful! Look, her body is more than 400 meters long, and 100 meters wide and high. Isn't it beautiful enough for such a great and amazing creature? You may not believe it. Yesterday The first time I saw Katsuyu's body, I…."

Kisame, who looked like a giant, blushed, looking like a shy little boy who was just beginning his love life.

"You, what are you talking about?"

Tsunade opened her eyes wide with a ghostly expression on her face, seemingly frightened by Kisame.

Kisame took a deep breath and was silent for a moment, then he approached Tsunade and confided to her nervously:

"When I laid in bed yesterday, I thought about it all night, and finally confirmed my heart. I... like Slug sage, and I want to be with her."

"…"

When Tsunade heard this, she was so shocked that she took a few steps back, her chin was about to fall to the ground, and she couldn't say a word for a long time.

Meanwhile Kisame was still talking to himself with a frenzied expression:

"I must learn senjutsu, absorb natural energy like slug sage, and learn the concept of Eight branches jutsu, so that I can evolve into a creature as great as her. At that time, I will be qualified to pursue her..."

'Snap!'

Tsunade slapped Kisame in the face, trying to "wake him up".

She hurriedly glanced at Katsuyu, and after confirming that it hadn't noticed the situation here, she stood on tiptoe, grabbed his collar and whispered:

"Hoshigaki Kisame, are you out of your mind, why do you have such...crazy thoughts?"

"I'm serious, Tsunade."

Kisame frowned and looked at her with a serious expression. Judging from his expression, he was definitely not joking with Tsunade.

"But, you... Katsuyu... the two of you..." Tsunade said incoherently, because it was really hard for her to imagine the scene of Kisame and Katsuyu being together.

"Do you know how strong is Katsuyu?"

Kisame suddenly asked Tsunade.

"This...of course she is very powerful. Even a tailed beast will appear insignificant in front of her. In the Shikkotsu forest, Katsuyu is invincible."

Tsunade was stunned for a moment, but replied.

As a ninja who signed a contract with Katsuyu, even if she tried her best, she could only channel a small part of her body each time, less than one-tenth.

If Tsunade could summon Katsuyu completely, she would have swept the Ninja world and unified the five villages.

"Then I'll ask you again, what is her character?" Kisame asked again.

"Wise and docile."

Tsunade thought about it for a while, and described Katsuyu's character in two words.

Indeed, the slug sage has a famous temperament. It is not only gentle in temperament, but also very friendly to people. This can be seen from the fact that it calls Tsunade and Kisame as " sama".

Katsuyu is a honored Sage, not only is it's status much higher than the two, but also older than the two, by many generations.

The sages in Mount Myoboku look down on all living beings from above, and the white snake sage in Ryuchi Cave is cruel and extremely happy to eat people.

Only Katsuyu is willing to put down her status and get along with human ninjas, as gentle as an angel.

"So, why do you still need to ask?"

Kisame stared at Tsunade and carefully compared her with Katsuyu, "Tsunade, the slug sage is more than ten times stronger than you, and has a better personality than you. Ten times, you can't deny it, can you? Even a woman like you is pursued and liked by so many men, why can't Katsuyu have admirers?"

In Kisame's view, Katsuyu is undoubtedly the most powerful creature in the ninja world, and her character is of a good wife and mother, and her voice is gentle and pleasant. She is the only ideal girlfriend in his heart.

At the very least, she definitely blew up a woman like Tsunade.

"Yes, but Katsuyu is not human..."

Tsunade was stunned by Kisame's words, and subconsciously retorted.

"Your world view is small."

Kisame shook his head, expressing disappointment at Tsunade's intellectual level, and asked directly, "What does it matter if Katsuyu is not a human being? Can't there be true love between species? And, precisely because Katsuyu is not a human being, I like her more. She is a beautiful creature that is more advanced than human beings, powerful and immortal, and this is what I dream of being."

These words are from his heart.

He already has a woman in the ninja world, Yukino. But in this relationship, Kisame is more loved and relied on, and mixed with some physiological needs and impulses.

Before that, he had not subjectively and strongly liked a certain woman, and even the beautiful Tsunade, who was loved by everyone, had not really moved him.

Kisame originally thought that as he went further and further on the road of "inhumanity", he would gradually lose human emotions and desires, and then lose love.

He thought that he was destined to embark on a lonely evolutionary path in the end.

Until he saw Katsuyu, he saw her incomparably huge body, and the powerful strength and vitality contained in that body.

At that moment, his heart was pounding, and he was deeply attracted by the unique beauty in her, and he fell for her.

This is love at first sight.

From that moment on, Kisame decided that Katsuyu would be his dream partner, the perfect "woman" he wanted to get no matter what.

Thinking of this, he whispered to Tsunade with a dull face:

"Please don't tell the slug sage about my feelings for a while, so as not to cause unnecessary trouble to her. I'm not strong enough now, I just want to watch her silently in the dark, until one day, I also become as great as her, and in the moment I will fully express my heart."

Tsunade came back to her senses and stared at Kisame silently for a while.

After a long while, she looked serious and responded with a warning:

"Don't worry, I won't say it. And from now on, I'll keep my eyes on you, lest you do anything perverted to Katsuyu."

In her opinion, although Katsuyu is very old, it has stayed in the Shikkotsu Forest for thousands of years and rarely goes to the outside world, so its personality is very simple.

Although Tsunade couldn't understand the so-called "cross-species love", it would be bad if he did strange things to Katsuyu and scare it.

"Tsunade-sama, Kisame-sama, you both got up early."

At this time, a three-meter-high Katsuyu clone swayed a pair of tentacles and climbed over from not far away.

Tsunade glared at Kisame and warned him to stay away from Katsuyu, and not hit on her.

Under Katsuyu's guidence, the two are about to officially begin their senjutsu training.

Last night, after reading Hashirama Senju's experience on Senjutsu, both of them understood the function of the hot spring in front of them.

As Katsuyu said, the first step in learning Senjutsu is to soak in hot springs.

The two need to soak their bodies in the hot springs for several days or even longer.

In this process, the spring water rich in natural energy will be gradually absorbed by them, and then the cells in their bodies will be "naturally activated".

When they reach the state of natural activation, their cells can passively absorb natural energy, just like breathing, and become an instinct of their bodies.

At that time, the two of them will be able to enter sage mode instantly as long as they put their hands together anytime.

In contrast, Mount Myoboku's sage mode, which takes a lot of time to prepare to activate every time, seems inferior.

However, everything has advantages and disadvantages.

After the natural activation and transformation of the body, it will also bring a side effect-speeding up the division of cells in the body.

In a person's life, the number of divisions of cells in the body is limited, only about fifty times, and then it will die.

Natural activation, although it will not reduce the number of cell divisions, will shorten its division cycle, thereby reducing their life.

Senju Hashirama with his sage body should have a very long lifespan, and it would not be a problem to live for one or two hundred years.

However, under the side effects of natural activation, even the sage body could not hold it, and died before the age of fifty.

Not to mention ordinary people, even if they reluctantly learned the Shikkotsu Forest's senjutsu, it would be good for them to live for a few years.

Katsuyu is different from humans.

It is a mollusk with a special body structure that can divide itself into small slugs infinitely, which means that its cells have no upper limit on the number of divisions.

Therefore, Katsuyu can continuously absorb natural energy for a long period of time, allowing itself to proliferate indefinitely, and eventually become the largest creature in the ninja world.

However, Katsuyu also paid a price.

Although it does not have to worry about the side effects of natural activation, it has a near-eternal life by absorbing natural energy, but the uncontrolled splitting causes its body to expand excessively, and in the end it almost merged with the Shikkotsu forest.

Back to the topic.

For Kisame and Tsunade, to overcome the side effects of natural activation, it is necessary to enter the second step, which is "balance".

They must learn to use their own consciousness to control the activated cells in the body, so that they can not only absorb natural energy every minute and every second, but also reduce the division rate to an acceptable level.

Eventually a dynamic balance will be reached.

For example, the lifespan is like the water in the reservoir, and the activated cells are like a water pipe, which continuously drains the water in the pool, resulting in the loss of lifespan and rapid death.

The solution to this problem is to turn reservoir into a flow-restricting valve and install it on the water pipe.

Usually it's a trickle, but when it's time to fight in sage mode, the valve is opened wide to maximize the flow in an instant.

It can be seen that the difficulty of Shikkotsu Forest's senjutsu is much greater than that of Mount Myoboku and Ryuchi Cave, but its power is also the greatest.

Once learned, the user can not only enter the sage mode very quickly, but also receive the increase of the senjutsu chakra, which is several times that of the senjutsu chakra of Mount Myoboku and Ryuchi cave.

After all, it is an Senjutsu performed at the expense of accelerating cell division and burning lifespan.

"Tsunade-sama, Kisame-sama, before you enter this hot spring, I want to give you one last warning."

Katsuyu erected a pair of tentacles, and her usual gentle voice became serious, "Once you start training senjutsu, it cannot be stopped, because the natural activation of cells is like cancer, and there is no way to cure it. It will accompany you for the rest of your life until the end of your life."

"I see."

Kisame nodded, his eyes burning brightly.

In his opinion, Shikkotsu Forest's senjutsu is the most powerful force in the Ninja world today. To get this power, it is natural to pay a price, even if the price is his lifespan.

Moreover, Kisame believes that there must be a solution to any problem.

After he obtained the senjutsu, he would find a way to use this power to make himself evolve again, and finally realize the leap of life level.

At that time, the side effects of the natural activation of cells may not be that bad.

"I agree."

After a moment of silence, Tsunade said solemnly.

At that time, her grandfather, Senju Hashirama, fought against his long-term enemy Uchiha Madara for a day and a night. Although he finally won, but after that battle, Hashirama also became seriously ill and died soon after.

Tsunade has been troubled for many years. With her grandfather's physique, how could he die of a serious illness? Even if he is seriously injured, he can heal himself without a seal. He is a god-like existence.

Now she finally understood that it was because of Shikkotsu Forest's senjutsu.

Senju Hashirama has been fighting for many years, and he overwhelmed the entire ninja world. But in the process, due to his frequent use of senjutsu, he also overdrawn his body too much.