Author note: I do not own Naruto.
Itachi stood staring at the moon on his way back to his "home" from an A-ranked mission. He had been told to go home and sleep. A lot of villagers respected the Uchiha clan. He didn't; he couldn't stand his "family". He hated his father. The man planning an attack on the village he lived in. The man who couldn't stand childhood innocence. Years ago his father used to shun a family member named Obito because he believed in friendship. Itachi had always wanted to meet his relative, but his father never allowed it. It was too late now; he had died during a mission before Sasuke had been born. His father also ignored Sasuke on a daily basis. As he stared at the moon, he wondered who he'd side with if there was a war between his clan and the village. The only people in his clan he cared about were Sasuke and Mikoto. His mother had cared about him and had tried to give him a childhood. But she would never go against her husband. She was afraid of Itachi. She had been for years. That's why she wanted another kid. Then she had Sasuke. Itachi should've been jealous, but instead he was happy for his mother. Now she'd have an innocent child, unlike him. Itachi had promised himself he'd keep Sasuke from becoming like him. In the village there were other innocent children that could become friends with Sasuke. Itachi made up his mind.
A month later Itachi and a masked lunatic stood outside the Uchiha compound. The masked lunatic requested to be called Madara. Itachi only accepted his help so he would be done by midnight. The masked man was bloodthirsty; he made them all suffer to the point some ended their own lives to escape the pain. Itachi would forever have their screams in his mind. By the time they finished, it was still awhile until midnight. Itachi dismissed "Madara" and continued on. He walked into his "house" alone. His father stood in front of his mother. Itachi used Mangeyko Sharingan on him to make him see what he did to his children. To make him feel their pain. Mikoto stared, even more afraid than usual. Itachi looked her in the eyes and apologized. Her surprise was obvious. She grabbed a sword that had always been displayed in the room. She looked him in the eyes and said she's the one who needs to apologize to him. Itachi could only watch as she finishes herself off with the sword. He stood in the room with both his now deceased parents. He went outside to wait for Sasuke to arrive. It was a Friday, Sasuke's training day. He wouldn't make it back until midnight or later. When Itachi heard the scream, he knew Sasuke was there. He watched as Sasuke entered the house, into the room where their parents were. He watched as Sasuke collapsed to the ground. Itachi entered, guilt increasing when Sasuke asked him what kind of monster would do this before he saw the blood. The blood Itachi was soaked in. The blood of their family members. Itachi used Mangeyko Sharingan on Sasuke to make him see what Itachi wanted him to. A false image of what happened. Sasuke screamed in agony. This was one thing Itachi couldn't help him with and Itachi hated it. The person that was so protective of Sasuke was the one that would change him. Everything besides that fact was a blur to Itachi as he left. All he remembered after that was that he had been crying and Sasuke had followed him and he had told Sasuke to hate him and kill him. Sasuke lost consciousness and Itachi dropped him at the entrance of the compound. As Itachi was leaving he looked at his surroundings of the Hidden Leaf Village for the last time. In his pockets he had a picture of him and Sasuke he had forgotten to take out, a leaf, and a drawing of ninja weapons from Sasuke. Those would become extremely precious to him. As he crossed the border, he was officially a rogue ninja. He used a kunai knife to make a line through his headband.
(Should I make a continuation?)