Naruto: Becoming Itachi and Sasuke's Big Brother from the Start!

[Dual Male Leads (Female Transmigrates into Male) + Growth Battle + Universal Beloved + Dark] After an accidental death, I transmigrated into the world of Naruto, joining the Uchiha clan. By chance, I was adopted by Fugaku Uchiha as his eldest son—a boy who doesn't exist in the original story: Uchiha Akatsuki. You ask what it's like to be Itachi and Sasuke's big brother? I can only say it's unbearable! Fugaku: "Akatsuki, for the honor of the clan, you must graduate early!" "Yes, Father." Fugaku: "Akatsuki, for the honor of the clan, you must join the military and go to the battlefield." "Yes, Father." Fugaku: "Akatsuki, for the honor of the clan, you must join the Hokage's direct ANBU." "As you command, Fa... what?" At this point, the obedient Uchiha Akatsuki finally realizes something is wrong. If I remember correctly, these are all things Itachi should be doing! If I do them all, what will he do? Look how old Itachi is—he hasn't even grown a tear trough yet. Does that make sense? Don't be so biased, Father! Just as Uchiha Akatsuki wanted to wash his hands of it, someone tugged at his hem. He turned around to see two little tagalongs behind him: one was calm as water, Itachi, and the other was full of sunshine, Sasuke. Both kids were well-fed and sleek, having never suffered, calling out "big brother" nonstop. Akatsuki sighed helplessly. Forget it, since I'm the big brother, I'll see it through. As long as I keep pushing, things will get sweeter, right? But as he kept pushing, Akatsuki realized something was wrong again. Sweet, my ass—I got the villain script! (Righteous turns villain, fake romance, real annihilation)