From the perspective of Shin Uchiha, Byakugan and Sharingan are actually two eyes with different origins. It is quite difficult to integrate them together.
Byakugan comes from Kaguya Ōtsutsuki who has the bloodline of the Ōtsutsuki Clan. Later, her second son Hamura Otsutsuki inherited this bloodline and continued it.
Sharingan, on the surface, also comes from Kaguya Ōtsutsuki, and was later passed to her eldest son Hagoromo Otsutsuki, which was later Sage of Six Paths, and then Uchiha Clan.
In fact, as long as you observe carefully, you will find that whether it is Rinnegan on Kaguya Ōtsutsuki or Rinnegan on Sage of Six Paths, they actually come from God Tree Fruit, which is later Ten-Tails.
Kaguya Ōtsutsuki also turned on Tomoe Rinnegan after taking God Tree Fruit.
The fruit of God Tree is the result of God Tree absorbing the essence of the entire planet in a certain way.
Therefore, Uchiha Clan and Sharingan can be said to be a product of this world in a certain respect, or a chosen one.
And Byakugan is the bloodline of the alien Ōtsutsuki.
Therefore, in Shin Uchiha's opinion, fusing them together is still somewhat risky.
However, after seeing the figure of Sister Tsunade, Shin Uchiha was completely relieved. After all, the level of Byakugan was still worse than that of Sage Body. Moreover, the current Shin Uchiha, with Sage Body, must be much more durable than before.
When Shin Uchiha entered sister Tsunade's bedroom, sister Tsunade also got up from the bed and greeted her.
When facing Sister Tsunade's worried eyes, Shin Uchiha held her in his arms, kissed her red lips, and comforted her with a smile:
"Sister Tsunade, don't worry, it's not a big problem."
However, Tsunade was still very worried when he heard Shin Uchiha's words. After all, the last time Shin Uchiha fused with Sage Body, sister Tsunade saw his embarrassed state.
In the end, Shin Uchiha couldn't defeat Sister Tsunade, so he came to the space with her, and Shin Uchiha built a house using Wood Release in a quiet place.
Although sister Tsunade has seen Wood Release used by Shin Uchiha many times, when he used Wood Release, she was still in a trance, as if she had returned to her childhood and saw Grandfather Hashirama Senju, who loved her the most.
Shin Uchiha also knew sister Tsunade's heartache, so he gently held her in his arms and comforted her:
"Sister Tsunade, don't worry. Although you have not awakened Wood Release, our child will definitely awaken Wood Release. When the time comes, let him carry forward Senju Clan.
Besides, if he has not awakened Wood Release, then we will continue to give birth. I don't believe it. With our bloodline, if we give birth to ten or eight of him, none of us will be able to awaken Wood Release."
Sister Tsunade was a little sad at first, but when she heard Shin Uchiha comforting her, she couldn't help but Shixiao got up and hit him gently.
"You think I'm a sow, and I'm still giving birth to ten or eight babies."
Shin Uchiha chuckled and thought about the future, "Sister Tsunade, when the time comes, it will depend on what bloodline our children have awakened. If they are Sharingan, their surname will be Uchiha. If they are Wood Release, their surname will be Senju."
Sister Tsunade heard Shin Uchiha's words and knew that he was careful. After all, Senju Clan is the only direct bloodline left to her. If all her children follow her husband Shin Uchiha and have the surname Uchiha, then Senju Clan will be the last to die.
And with the Wood Release bloodline in Shin Uchiha, plus the Senju bloodline in Tsunade, it is still very likely that the child born will awaken Wood Release, and if the child's surname is Senju, it means that Senju Clan is still inherited, although there is a high possibility that the descendants of the Senju Clan will awaken Sharingan.
Although Tsunade was moved, she still remembered the business and hurriedly urged her Shin to fuse the blood of the Hyuga Clan.
Shin Uchiha nodded, sat cross-legged on the ground, closed his eyes, and activated Dōjutsu--Copying Eye in Mangekyō Sharingan with his consciousness, so that the blood of the Hyuga Clan existing there began to merge with Shin Uchiha's body bit by bit.
Shin Uchiha's experience integrating Kekkei Genkai this time was much better than the last time. Although he could feel the burning sensation in his eyes that kept irritating him, sister Tsunade, who was standing by, often used Medical Ninjutsu to relieve his discomfort and make him less miserable.
Moreover, the most important thing about Kekkei Genkai's fusion this time was the eyes, while Shin Uchiha didn't suffer much pain on the body.
When Shin Uchiha's pain passed, half a day had passed. At this time, it was daytime, both in the outside world and in space.
Shin Uchiha only felt that his eyes were now soaked in warm water, which was very comfortable. Moreover, he also felt that his eyes had been strengthened. Although he didn't know what aspect of the strengthening, it also made him very happy.
With a thought, Shin Uchiha grabbed sister Tsunade who was standing aside and took her Teleportation to the highest point of Spatial Island.
In the gentle breeze, Shin Uchiha slowly opened his eyes.
The world displayed in front of Shin Uchiha is as if it has been switched from normal mode to ultra-high definition mode, and it is still the kind with added filters.
Although Shin Uchiha has not yet activated his Byakugan, his current visual distance has reached an inhuman level, several times greater than that of a normal person. He has truly reached the point of seeing everything clearly.
Shin Uchiha With a thought in his mind, he waved his hand gently and summoned a water curtain in front of him, illuminating his entire figure extremely clearly.
Shin Uchiha looked at his black and white eyes and breathed a sigh of relief. After all, he was Clan Leader of the Uchiha Clan. If he walked around the market with a pair of white eyes all day long, he didn't know what trouble would happen.
Even if his tribe could reluctantly accept him, Hyuga Clan's Hyuga Hiashi would not be able to resist and come to him to investigate.
After all, Hyuga Clan is very sensitive to this aspect. In order to prevent the leakage of Byakugan of the Hyuga Clan, Cursed Seal'Caged Bird Seal' was invented.
Therefore, Shin Uchiha feels that it is better not to stimulate Hyuga Clan's sensitive and fragile nerves.