Naruto and Kisame continued to beat on each other, by now Kisame had the other half of his other arm covered in stone and it was moving down his body at a fast pace. Naruto didn't know if his chakra would last long enough for him to win but he had to hope.
Kisame and Naruto's bodies were not wasting a single movement. Kisame was trying to only hit Naruto in the most vital of areas to end him faster. And Naruto was making sure he could hit as many times as he could without being hit so his chakra wouldn't run out. Naruto didn't have much chakra left and it seemed like he would run out of chakra before he could immobilize Kisame. As they were fighting a roaring thunder dragon struck and completely erased the mountain where Itachi and Sasuke were fighting.
'Looks like Sasuke ended it, I should finish this too.' Naruto dispersed his last clone and the senjutsu chakra flowed within him and recharged his sage mode. A storm of blows in succession flew out at Kisame. Kick, thrust, palm strike, elbow, knee, fist, almost as if it would not work unless he used every move he could to kill his opponent. Kisame was dodging most of the blows but with the damage, he had received it was taking everything he had to do that and couldn't counter-attack.
Kisame was getting weaker, slower, and less skillful by the second. Now that he was almost completely stone Naruto had no trouble dealing with him. There was only one problem, he didn't have enough senjutsu chakra! Naruto ran out of sage mode! Kisame noticed this and took the opportunity to finish off Naruto.
Kisame bit into Naruto, a huge amount of blood was ripped out. 'Fox this is really bad, any ideas!' Naruto called out in his mind with an urgent voice, but there was no answer. Kisame continued to bite Naruto draining his regular chakra too, soon enough, he would die from chakra exhaustion! 'Fox!' [I'm here damn it, you better be grateful!]
Naruto was confused until he felt a wave of a familiar chakra run through his body, it was senjutsu! Naruto didn't know how he got it but he didn't waste any time before striking Kisame over and over. "Ora Ora Ora Ora!" Kisame quickly stopped moving and completely became petrified.
The water bubble around Naruto burst making Naruto fall out of it. After Naruto reached the ground he decided to ask, 'How did you manage to absorb natural energy?' [I have done it many times, it's pretty easy. I could usually give you a near-infinite amount but it's hard in this cage. If you just let me out this would be a lot easier.] 'Not until you tell me your name.' [I told you I don't have one!] Naruto laughed, "I really don't get why your so embarrassed!" this time there was no response.
-Itachi vs Sasuke-
Sasuke could barely stay conscious, there was no way he could fight! "This time, I shall show you my final trump card, the Susanoo." "The Susanoo? Another one of your abilities?" Itachi walked forward a little, "Tsukuyomi and Amaterasu, when these two powers awakened, one more jutsu bore fruit in my eyes."
Sasuke crawled back a little and leaned on the back of a rock. "Sasuke, is that it for your jutsu? If you are hiding another power, don't hold back. The real battle is only just beginning." the sky then began to clear, "So, that is only a one-time jutsu, as I expected." The Susanoo worn by Itachi started to evolve, the skeletal Susanoo he had before was now covered in armor! "What wrong? Have you used up your chakra and run out of options?"
Sasuke was going to retaliate but he felt a huge pain in his neck like something was trying to break out! The pain grew more and more and it wouldn't stop! A whitehead-type thing tried to escape from Sasuke but suddenly something wrapped around it, it was the seal made by Jiraiya!
The seal wrapped around the head and crushed it back into Sasuke, this deactivated the curse mark instantly. "I don't need you Orochimaru, I'll kill him myself!" Itachi inched forward even more, "You better hurry up Sasuke because right now, your reality is still an illusion."
"God damn it!" Sasuke felt a rage he had never felt before rising up in his body, "After all this time I'm still too weak! Too weak to kill you god damn it!" under the powerful emotions, Sasuke felt something change in his body. Blood started pouring out of Sasuke's eyes as Sasuke was screaming.
Itachi was shocked, "The Mangekyou Sharingan!" black flames summoned next to Itachi but Itachi dodged, the Black flames seemed to have jumped at Itachi but Itachi managed to block it with his shield. "You can control the Amaterasu, that must be your Mangekyou Sharingan's ability."
Zetsu was also shocked, "He blocked the Amaterasu, how? Wait, is that the Yata mirror! It's said to be able to block any attack!"
Sasuke held his eye in pain after using his Mangekyou Sharingan for the first time. Finally, Itachi used the Yata mirror to control the flames, Sasuke couldn't control his Mangekyou Sharingan. Itachi inched forward, "This is it, Sasuke. Now your eyes will be mine. I think I'll take my time to retri-" before Itachi could talk anymore he caught out a handful of blood.
Itachi then collapsed on his knees and began to cough out more and more blood. Itachi's Susanoo deformed all the way back to skeleton form but Sasuke was too weak to take advantage of it. Itachi walked towards Sasuke and extended his arms and gave Sasuke a tap on the forehead. "Sorry, there won't be a next time, Sasuke." Itachi then let out a smile as he fell to the floor lifeless, Itachi Uchiha, was dead.