Amaterasu!

With a miserable scream, Itachi gouged out Sasuke's left eye and held it in his palm. Watching Sasuke cover his bleeding socket in agony, Itachi said calmly, "Didn't I tell you? Without the Mangekyō Sharingan, you could never defeat me, the one who possesses these eyes. The other one... I'll be taking that too."

Feeling the pain in his eye socket, Sasuke knew that if this continued, he would lose both his eyes. So he released the Cursed Seal. Ominous markings covered most of his body, and a massive palm-shaped fleshy wing rapidly sprouted from his back, forcing Itachi away.

"So this is the power of the Cursed Seal... But the gap between our powers..." Itachi glanced at Sasuke, then took out a small jar, tossed Sasuke's eye into it, and carefully stored it away. The next moment, Itachi's clone emerged from behind Sasuke and locked him down, calmly saying, "The difference in our ocular powers is an unbridgeable chasm."

Itachi walked up to Sasuke, preparing to dig out his other eye as well. But just then, he saw the Cursed Seal on Sasuke's body change. Like weary birds returning to the forest, all the black markings flowed into Sasuke's eyes. The next instant, two pythons burst out from Sasuke's back and pierced Itachi's body.

The surrounding scene shook and slowly faded into black and white. Under Itachi's astonished gaze, the space shifted apart piece by piece like a sliding puzzle. Finally, with a Bang!, it dispersed completely.

Sasuke stood where he was, covering his eye and panting heavily before dropping to one knee. White Zetsu, who had been watching from the shadows, saw this and couldn't help saying, "Eh... This might end unexpectedly quickly! Itachi has won."

"Why?" Black Zetsu asked.

"Because he was hit by Tsukuyomi and can't