Disclaimer: Not mine. Duh.
Uchiha Sasuke used to wonder what he did wrong.
Those were the days when he woke up, alone, in Oto, with no Team Seven to trust. Those were the days when he woke up in cold sweat, from nightmares far worse than he could have imagined they would grow to become. He thought, he thought he was leaving behind his fears with Sakura's tears and Naruto's blood.
He knew within a month in Oto that he had thought wrong. Without him being there to watch them, to know that they are all right, to challenge Naruto and protect Sakura, his nightmares only have new elements. Now not only is Itachi killing the clan, he's killing the only real friends Sasuke's ever had. Sometimes, it's even Sasuke himself doing the killing.
It is only holding on to the idea of home that keeps him from going mad entirely.
Uchiha Sasuke now wonders what he did right.
These are the days when he wakes up to Sakura in his arms, his kids arguing in the halls, and Naruto living just down the street. These are the days when nightmares are few and far between, and somewhere Itachi is rotting in hell. He doesn't see Sakura's tears anymore, and nothing makes him happier. Now he sees her smiles, and the times when he sees Naruto's blood are very infrequent.
When he does see it, it's okay, because Sakura can make it better now. Hasn't she always been able too? He thinks it's ultimately fitting she became a med-nin. After all, she's been healing Naruto and Kakashi all along. She was healing him too. He was just afraid to see it.
Uchiha Sasuke is no longer afraid.