Edited, for typos and a bit of style. I (still) don't have a clue how good this is; it doesn't have much of a typical plot and I haven't got a clue if it makes any sense to anyone but me. Hope you enjoy.
Chapter 1-Sasuke
Itachi doesn't know. No one knows. And certainly not Itachi.
Definitely not Itachi.
It would just be wrong if Itachi knew what Sasuke did. It would be wrong if he knew that, in some secret, hidden part of his mind, Sasuke still loved and respected his older brother. Well, Itachi might know that, if he bothered to think about it. Sasuke could be stronger, if he really wanted to; he might have been able to kill Itachi if he had really tried.
But Itachi didn't know why. He couldn't know what Sasuke did. He didn't know that the father who'd loved Itachi so much hadn't loved Sasuke at all. He didn't know about the training that Sasuke had had, secretly, with his mother, when she taught him exactly how much chakra he had to use to pass out from chakra exhaustion but not die.
And there was no way that Itachi knew about the other training Sasuke had had, with their father, whenever Itachi wasn't home. And he definitely didn't know why their father was making Sasuke use chakra until he passed out. And he didn't know about the warning that their mother had given Sasuke. And Itachi didn't know that Sasuke had been planning to run away, because their father had told their mother that if Sasuke didn't manage to kill himself in his chakra lessons soon, he'd just drain Sasuke's chakra himself, because Sasuke wasn't talented like Itachi and a weakling wasn't allowed in the Uchiha clan. And Itachi didn't know that, no matter how much it hurt to lose his cousins and aunts and uncles and parents, and brother, Sasuke was grateful to him, because Sasuke really hadn't wanted to die, even if he was too weak.
And Itachi didn't know that that was why Sasuke had gone to Orochimaru, because he could get power there to kill Itachi, but also because he was meant to have run away long ago anyway. And because maybe, just maybe, Itachi did know and wasn't crazy. But Sasuke knew they both were. And that secret part of him, that still cared for his brother, hoped that maybe, if Itachi knew Sasuke was crazy too, when one of them killed the other, maybe it wouldn't hurt so much.
And that was the real reason Sasuke had gone to Orochimaru.
But there is no way that Itachi knows that.
