Suprise suprise: Obito lives?

Shisui and Sasuke are still walking to the Uchiha hideout "Shisui I appreciate you helping me but I want to take care of Itachi on my own" Sasuke said. "Sure if you need me I'll be on the roof if you need me," Shisui said before he grabbed his special kunai. threw it up on the roof and teleported on the roof.

Sasuke enters the hideout. "Sasuke what do you see with your Sharingan," Itachi asks. "I see you dead Itachi" Sasuke replies. The two begin fighting as Sasuke attempts to strike with his Chidori Sharp Spear; Itachi uses his Early Sacrifice technique to jump on Sasuke's shoulder, evading the attack and spins Sasuke around before slamming him into a wall. As Sasuke hits the wall, he prepares his Chidori and rushes towards Itachi. Just as Itachi expects Sasuke to thrust him with it, Sasuke disperses the lightning chakra through his Chidori Current and uses the opportunity to leap into the air and impales Itachi with his sword.

As Itachi falls on the ground below, he muses that Sasuke has grown strong and disintegrates into a flock of crows. Sasuke realises that Itachi has been using a Genjutsu, but it turns out that the Sasuke that was fighting is also an illusion; the real Sasuke sneaks up from behind Itachi and runs his sword through him. As Itachi coughs up blood, Sasuke demands to know who else from the Uchiha clan survived. When Itachi further questions his demand, Sasuke reminds him that he was told he would be the third to awaken the Mangekyō Sharingan, meaning there was someone else out there other than Itachi who possessed it. Believing that this person aided Itachi to take out the police **** in the clan's massacre, Sasuke pushes the blade further through Itachi's torso as he demands to know who it is so that he may kill that person as well. Itachi responds that it is none other than Madara Uchiha, the co-founder of Konohagakure; Sasuke recalls the Nine-Tailed Fox telling him that he reminded the tailed beast of Madara from the elder days.

Sasuke finds Itachi's claim of Madara Uchiha being a co-conspirator of the Uchiha Clan Downfall to be a farce since Madara was the co-founder of Konohagakure and thus should be long dead. Itachi reminds Sasuke that one's reality is merely another's fantasy and that the truth is that Madara is still alive, whether he would like to believe it or not. As Sasuke has his sword impaled through Itachi's back, he tells Itachi that his Sharingan has matured to a point where Itachi's Genjutsu won't work on him; Sasuke then turns around and fires a Chidori Sharp Spear at the real Itachi, who is sitting behind him, missing Itachi's face by inches. The brothers are unaware that their bout is being witnessed by Zetsu, who wonders why they haven't begun their clash already.

Realising that his life's goal is finally in front of him, Sasuke removes his bandages as he launches a volley of shuriken at Itachi, who fires his own back. Sasuke rushes towards Itachi with his sword, who blocks it. As they remain locked in each other's grip, Itachi's shadow clone comes from above, throwing kunai towards Sasuke. Forcing a snake to burst out of his cursed seal, Sasuke uses the snake to shield himself and leap backwards. Using the Unsealing Technique, Sasuke summons a fūma shuriken and hurls it at Itachi, who blocks it with a kunai. However, Sasuke managed to imbue the fūma shuriken with his Lightning Release, running his Chidori through it; the process destroys the Itachi shadow clone.

Using his Mangekyō, Itachi arrives before Sasuke and kicks him into a wall, trapping his arms and feet. He asks Sasuke to forgive him as he seemingly removes Sasuke's Sharingan eyes. Itachi manages to extract Sasuke's right Sharingan eye and attempts to remove his left eye as well, only for Sasuke to enter into the second stage of his cursed seal, using his only remaining wing to push Itachi away. Itachi, though, uses a shadow clone to bind Sasuke from behind while he approaches his brother and attempts to pull his left eye out. The entire ordeal, however, is revealed to be Tsukuyomi, a Mangekyō Sharingan genjutsu that Sasuke is able to break through, much to the shock and surprise of Itachi

As Itachi is on his knees, reeling from the pain in his eyes, Sasuke unseals and summons two fūma shuriken, which he hurls at Itachi, hiding the second shuriken in the shadow of the first. Itachi barely manages to avoid being sliced by the two shurikens when Sasuke pulls the shuriken with wire strings, stabbing Itachi; Itachi is revealed to be suffering from a blurry vision after having used his Tsukuyomi. Upon seeing his dazed brother, Sasuke mocks his visual prowess before using his Fire Release: Great Fireball Technique at Itachi. Itachi is barely able to evade it, leaping into the air, only for Sasuke to rush towards him with his Chidori in hand.

Sasuke's Chidori manages to hit the ceiling, creating a massive hole; Itachi uses the Great Fireball Technique both offensively and defensively, propelling himself out of the Chidori's range. As they both land on the rooftop, they both use the Great Fireball Technique, their flames clashing against one another. Itachi unleashes the Amaterasu ability from his right Mangekyō Sharingan to create inextinguishable black flames that smother Sasuke's orange flames and proceeds to burn Sasuke himself. Sasuke attempts to shield himself with his wing, only for the wing to burn off. As the Amaterasu attempts to consume him in flames, Sasuke reverts back to his normal state and uses his Chidori Sharp Spear to create a hole beneath him while shedding his skin to avoid being burned by Itachi's Amaterasu, having gained the ability to do so after absorbing Orochimaru.

Reactivating his cursed seal to its second stage once more, Sasuke uses the last of his chakra to use Fire Release: Great Dragon Fire Technique, creating a dragon-head shaped fireball that bursts through the roof, narrowly missing Itachi and firing off into the clouds. As Sasuke's cursed seal recedes once more, Itachi, using his Sharingan to gauge Sasuke's chakra levels, claims that Sasuke has lost the battle. Sasuke, however, gives Itachi a smirk and asks if he would actually come to a **** match unprepared, as storm clouds begin to rumble above them. Sasuke warns Itachi that his next technique is unavoidable, just like the Amaterasu

As the thunder clouds begin to form above them, Shisui realises that Sasuke had created them from the heat of his Fire Release: Great Dragon Fire Technique along with the heat of Itachi's inextinguishable Amaterasu. Harnessing the lightning in the clouds with his chakra, Sasuke uses his new Jutsu, in an attempt to kill Itachi and ends up completely obliterating the Uchiha Hideout.

Sasuke believes he has finally won, only for Itachi to stand up, having survived the impact due to his Susanoo, a colossal chakra guardian exclusive to those who possess the Mangekyō Sharingan in both eyes. As Itachi begins to make his way towards Sasuke, who is out of chakra, the repressed portion of Orochimaru that Sasuke had absorbed begins to take over his body. Using the Eight Branches Technique, Orochimaru's eight white snakes burst out of Sasuke's cursed seal as Orochimaru himself exits from one of the snake's mouths, thanking Itachi for lowering Sasuke's chakra enough to the point where he could break free and grateful that he has another opportunity to take over Sasuke's body.

Using his Susanoo's Sword of Totsuka, which has the ability to seal any soul and trap it forever in a genjutsu, Itachi decapitates seven of the eight snakes and manages to seal Orochimaru away, removing Sasuke's cursed seal in the process. However, this takes too much chakra, and Itachi's Susanoo is reduced to its most basic form. Itachi, coughing up blood, slowly makes his way towards Sasuke, who is unable to move away from him. As Itachi comes close to Sasuke, he whispers his last words to Sasuke and proceeds to poke his forehead before collapsing down to the floor, dead. Sasuke contemplates Itachi's last words and stares at his brother's corpse before collapsing next to him out of sheer exhaustion.

As Shisui is about to go check on Sasuke. Tobi and Zetsu appear Tobi asks Zetsu if he had recorded the event, as he wishes to analyse it later. as Tobi was about to grab Sasuke and Itachi "stop. what do you think you are doing" Says Shisui. Tobi turn around to see Shisui ready to fight with his swords out and his Sharingan ready "we didn't come here to fight. we came here to ask Sasuke and his group to join the Akatsuki so put your sword down" Tobi said and Shisui put his swords away. "I see that Itachi let you live and not just Sasuke. this makes things a lot more interesting" Tobi added.

"speaking of interesting I see you have a Sharingan yourself. so what's your name" Shisui asked before using God technique to get beside Sasuke. "wow your pretty quick. my name is Madera Uchiha" said Tobi. Shisui looked at him and said "no way Madera was fatter than you are and is Dead. what's your real name". "ok it's Tobi".Tobi said. "there isn't and never was a Tobi Uchiha. but by moving the T behind the I adding an O. would make you my other Uncle Obito." Shisui said picking Sasuke up. ''Alright you got me. My name is Obito. your look and smartness remind me of Kakashi so much" Obito said "I should Kakashi is my other uncle, so where to? " Shisui said.