I fought over myself for a while, but in the end, Orochimaru won and I was forced to fight Naruto. Sure, he was annoying and I sometimes hoped to fight him, but this? This could kill him! I will lose control and use the curse mark. I'm getting unconscious… the evil will awake…I'm sorry Naruto…not literally, but I hope you understand that I didn't mean to try to kill you… when I… use… deadly… moves… Sorry…
"Sasuke! Why would you want to leave? Huh, Sasuke huh? Why?" Naruto yelled at me.
" I feel like it. Anything that happens in my life is a choice made by me. So far I didn't regret anything since leaving the village," I said simply.
" Leaving all your comrades, hurting them, killing them, just to visit Orochimaru? Why would you do that? It hurts to think that this is how it would end…" Naruto said to me. He spoke with a loud voice, but the last sentence was spoken in a soft, quiet voice that didn't sound like Naruto at all. His eyes looked dull, no life, no happiness shone in them. I hoped that Orochimaru or any of the Sound was taking over him. He then looked up and yelled, " I asked you a question! Answer me with a reasonable answer! Sasuke!" with the old bright Naruto eyes and loud, booming voice. I glared at him. And so with that, an unwelcome fight began. Not welcomed, not reasonable, or meant to be fought.
Third Person POV: Naruto and Sasuke both grew tired after an hour of fighting they were also running out of chakra. With a lot of his chakra, Sasuke punched Naruto, long and hard directly on his stomach. Naruto coughed out blood and ran out of chakra. Sasuke was expecting him to die, but instead of that, an evil red aura surrounded him. His eyes had turned red before he opened them and his teeth grew sharp. His hair looked more spiky and he looked more evil.
Right after Sasuke's thought, Naruto yelled to him, " I will even break the bones in your arms and legs if I have to, Sasuke!"
Sasuke was completely stunned at the sight of Naruto rising, having an evil aura, and yelling something horrible. Naruto isn't really like that. That is the reason he was stumped. They have never gone this far in a battle where Naruto used this strange red chakra. Sasuke then thought to himself, ' I must use the second phase of the curse mark then. He slowly changed. Sasuke's hair grew gray and longer. His eyes were different, his skin was more tan, and Sasuke had wings. This time though, Naruto was not stunned because the aura was keeping him from going crazy. Even so, Naruto yelled at Sasuke and this is how it went, " Sasuke… so you decided to use your second phase, huh? Be careful, you may be going crazy."
" I would never go crazy Naruto. Only you would," Sasuke stated, simply smirking afterwards. " By the way, seems like this red aura made you a bit smarter, huh? Thought you would not figure out that this was my second phase of the curse mark. It makes you stronger when you are with Orochimaru."
" You… how could you! Your friends like having you around! And you… you don't even care!" Naruto shouted.
" There were times when I thought that I should stay with Konoha… but there were times when I didn't. My answer is… don't. I already have a place I can go to anyways," Sasuke replied. The battle from then on was more dangerous. As to have part of the Kyubi fighting with Sasuke and a part of Orochimaru. That is how dangerous it was. That is because that was what it probably was anyways. The fight would have ended long ago if not for their new sources of power. However, the last move was rasengan against chidori. The spark from the clash of the two Justus made a slash mark across Sasuke's headband. In the end, well, of course that means that the battle ended. Naruto fell unconscious and Sasuke left, jumping off into the forest.