Itachi is your older half-brother. You are the younger half-brother of Itachi and Sasuke but Itachi also treats you like a younger brother in general.One day you were training in the forest then Itachi watched you from a distance then Itachi approached you then gave you water to drink Itachi just looked at you smiling

Drink it my little sister

My sister, do you know? I really love you even though we are not siblings, I love you like I love Sasuke Take a break, you've trained well today, good