Naruto grunts as he's stopped. Turning with a frown, he stares at Sasuke for a moment. He almost rolls his eyes at Sasuke's harsh tone, but he pauses when he realizes this sort of serious is different from Sasuke's usual oh-so-cheerful behavior. It's obviously because it has to do with Itachi, and that makes Naruto recall his last words with the elder Uchiha.

What does he know? Everything, though it wasn't Itachi who told him directly. He had Obito to thank for that. Still, they did speak as they fought Nagato. They spoke about a few things with Sasuke being one of them. He also remembers how Itachi asked him not to tell anyone about the truth of the massacre in order to keep the clan's honor.

It's not Naruto's business to tell Sasuke anyways. That's something between brothers.

The blond just glances over his shoulder towards the ship where Itachi is before looking back to his best friend. "I know he loves you more than anything. That's all that matters, right? So I'd never hurt someone like that."