"Hashirama Cells had originally been the greatest secret hidden by Konoha's higher-ups. But after the Third Hokage stepped down and Shimura Danzō was driven out, Clan Head Uchiha Shūichi also obtained Hashirama Cells from Konoha."
"It was precisely by relying on Hashirama Cells that Clan Head Shūichi could ignore the Mangekyō's flaws and maintain perfect Dojutsu Power all the way to this day."
"In fact, when your father learned that your brother had awakened the Mangekyō Sharingan, he once considered overthrowing Konoha Village. Even if his own Mangekyō went blind as a result, he could still give it to your brother and let him attempt to fuse an Eternal Mangekyo."
"Throughout history, Eternal Mangekyo were formed through the fusion of brothers' eyes. But that was only because there were originally so few ninja capable of awakening the Mangekyō Sharingan, so your father believed that the blood relationship between father and son should also be able to produce an Eternal Mangekyo."
"Unfortunately, your father and the Third Hokage ultimately perished together in battle, and the Mangekyō was damaged as well, so it was never passed down."
"However, before your father went to duel the Third Hokage, he left instructions. If you also awakened the Mangekyō Sharingan, then should anything happen to you brothers, you could fuse an Eternal Mangekyo through an eye transplant."
"Now that I think about it, he may have foreseen Itachi's fate long ago and placed all his hopes on you, Sasuke."
Uchiha Mikoto spoke so much in one breath that Sasuke was at a loss for a moment. Then Uchiha Mikoto continued, "Whether or not you receive your brother's eyes is for you to decide, Sasuke. If that truly will not work, you can also strengthen yourself with Hashirama Cells."
Uchiha Sasuke fell silent for a moment