Naruto: Unlocked the Mangekyō because I was afraid of death

My name is Uchiha Waku, I am a time traveler, I am a coward, I am very afraid of death. When I learned that I traveled to the Uchiha clan, I was always worried about when that filial son would exterminate the clan.
For this reason, I became the first licker of Konoha, licking Uchiha Itachi crazily, and was often bullied by other clansmen, but I endured it. Compared with death, what is this?
But why are you still unwilling to let me go? I have become a running dog of the village like you, why do you still want to kill me?
Uchiha Itachi: Because of your cowardice, you are not worthy of the glory of the Uchiha clan!
When Uchiha Itachi inserted the cold knife into my body, my Mangekyo finally awakened…