In Shin Uchiha's view, the Byakugan and Sharingan were actually eyes with two different origins, so fusing them would be quite difficult.
The Byakugan came from Kaguya Ōtsutsuki, who carried the bloodline of the Ōtsutsuki Clan. Her second son, Hamura Otsutsuki, had later inherited that bloodline and passed it down.
On the surface, the Sharingan also seemed to have come from Kaguya Ōtsutsuki. It had then passed to her eldest son, Hagoromo Otsutsuki, who later became the Sage of Six Paths, eventually giving rise to the Uchiha Clan.
In truth, a closer look revealed that both Kaguya Ōtsutsuki's Rinnegan and the Sage of Six Paths' Rinnegan had come from the God Tree Fruit, which later became the Ten-Tails.
Kaguya Ōtsutsuki had only awakened the Tomoe Rinnegan after eating the God Tree Fruit.
The God Tree had produced that fruit only after absorbing the essence of the entire planet through some means.
Thus, in a sense, the Uchiha Clan's Sharingan could be called a product of this world, or its chosen child.
The Byakugan, on the other hand, belonged to the bloodline of the alien Ōtsutsuki.
That was why Shin Uchiha believed there were still some risks in fusing them.
However, the moment he saw Tsunade, Shin Uchiha felt completely reassured. After all, the Byakugan was a level below the Sage Body, and now that he possessed a Sage Body, he could surely take much more punishment than before.
When Shin Uchiha entered Tsunade's bedroom, she got out of bed and came over to meet him.
Faced with the worry in her eyes, Shin Uchiha pulled her into his arms, kissed her red lips, and reassured her with a smile:
"Tsunade, don't worry. It won't be a big problem."
Even after hearing his words, Tsunade remained deeply uneasy. After all, the