He proceeded to use his Tsukuyomi for the first time. For 48 hours, he showed Sasuke the death of his clan. He knew how much Sasuke loved him, but this love would lead his brother to his death. If Sasuke started asking questions and found out the truth, he would proceed to destroy the village, and Itachi already knew the outcome. His brother would die. The other option was to take Sasuke away. However, the life of a missing nin, a ninja who will join the Akatsuki, is not suitable for children.
Naruto: Veil of Deception (Aizen reincarnates as Sasuke Uchiha)
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