Orochimaru, one of three legendary sannin was on his deathbed. He couldn't muster any strength primarily because his body was not really his.
He just had a simple goal which was to attain immortality and learn all the jutsus in the world.
To achieve that goal, he trapped Sasuke Uchiha to take over his body at the right time under the pretense of helping him get his revenge on Itachi Uchiha for killing their whole clan.
The truth is that Orochimaru was a pseudo-immortal. He made a weird immortality jutsu to ensure that he lives forever.
His immortality jutsu helps him possess others's bodies by transferring his own soul into them.
However, Orochimaru can't possess a single body for more than 3 years. That is why he was weak right now and wanted to take over Sasuke's body as fast as possible.
He was always an anomaly since his days at the Hidden Leaf. His useless master, the third Hokage, couldn't see what he was becoming until it was too late, and he became a psychopath.
He is now the most wanted man in the Hidden Leaf just like Itachi Uchiha.
'His body will be mine very soon' Orochimaru said as he felt a sudden pain in his heart and clenched his heart. He knew that he would die in a day or two if this went on.
However, at this moment, a light beam made up of lightning attacked him through the door which Orochimaru blocked with his hands.
"The nature of this chakra is! But I have never seen this kind of shape transformation," Orochimaru said as he kept looking at the door.
It was then that the door was shattered into 8 pieces, and Sasuke attacked Orochimaru at full speed with his curse mark fully activated. He definitely felt a bit weird since he had two extra wing-type arms, but he didn't care enough about it.
To him, his only goal right now was to kill his enemy. He didn't wanted to have any useless talk with Orochimaru so he went straight to the kill.
Seeing the upcoming threat, Orochimaru spits out his real body. His real body was a giant white snake made up of small white snakes.
Orochimaru attacked Sasuke with snakes but Sasuke dodged most of them and went for his head.
His sword sliced through the snakes at the front; meanwhile, his other arms protected his back. Thus, Sasuke easily reached the head of the white snake.
He stabbed the head with his sword, which went through his head and activated his Sharingan to brace for Orochimaru's last trick.
"Good, my food came to me by itself. I'll show you that I'm immortal," Orochimaru said as he took Sasuke to his own space where the ritual of his Living Corpse Reincarnation Jutsu to change bodies with his prey.
Sasuke found himself inside of what seemed to be the belly of a creature. Orochimaru appeared in front of him, almost completely covered in flesh.
"Shall we begin ?" He said as Sasuke saw some other people that appeared in the space, which were the previous hosts of Orochimaru's bodies who were all dead and covered in flesh.
"Those eyes will be mine," Orochimaru said to which Sasuke, who had his curse mark activated, chuckled.
"No, I don't think so," Sasuke said as Orochimaru realized what was happening to him.
Orochimaru's space started to become dark as Sasuke's indomitable will started to absorb him.
"No, this is my universe! I created it! This can't happen!" Orochimaru said in disbelief as Sasuke kept absorbing him.
After that, Orochimaru yapped about how he was immortal and how he was supposed to get everything, but Sasuke didn't give a shit and completely absorbed him.
"Goodbye, Orochimaru," he said as he opened his eyes since he sensed someone coming near the room.
Sasuke knew who it was. It was Kabuto, one of his most hated characters in the entire show, alongside Danzo.
[Congratulations to the Host for completing the first quest]
[Does the host wish to receive the rewards now?]
Sasuke ignored the notification for a moment because he had a more important task at hand, which was to kill Kabuto. He didn't want to be disturbed by Mangekyo's awakening.
Killing Kabuto now would save him a lot of future troubles. If he killed Kabuto right now, then there won't be any Madara to deal with.
He would only have to worry about Obito, so he patiently waited for Kabuto to arrive, which he did in just a few seconds.
A guy who had a ponytail and was wearing glasses appeared at the door and was dumbfounded.
Sasuke didn't wanted to startled him so he slowly walked towards him.
"Which one are you?" He asked to which he simply received a sword in his heart.
Kabuto slowly melted into mud and fell to the ground.
"A mud clone?" Sasuke said with confusion.
...
Some minutes ago, Sasuke was searching the area to find Orochimaru's room. He didn't have original Sasuke's memories, so he had to manually search for Orochimaru's room.
However, Sasuke had no idea that he was being watched by Kabuto from afar who found Sasuke's actions suspicious.
Kabuto trusted his instincts and sent only a mud clone to Orochimaru's room to see the results of the supposed battle.
Thankfully, he survived and lived to see another day.
"Why is Sasuke targeting me? Does he want to kill me? Either way, I should run before he finds me," Kabuto said as he ran for his life.
Meanwhile, in Orochimaru's room, Sasuke was pissed. He wanted to kill Kabuto but he failed to do so.
"I will find him," Sasuke said as he started running around to find Kabuto.
Unfortunately, he didn't know anything about the base and only went deeper into the underground base without knowing.
"Maybe I should received Sasuke's memories. At least I would have known the way out". He said as he kept looking for Kabuto.
*Boom*Boom*
"What's that voice?" Sasuke said as he turned around and went towards the area where the explosion came from.
After reaching the area, Sasuke found some boulders blocking what seemed to be the entrance of the base.
He knew that Kabuto had likely slipped away from his palms.
"What a slippery bastard," Sasuke said as he turned around and decided to receive his rewards.