Alright I am gonna make an exception and publish this chapter even though I didn't reach the goal. And it doesn't seem like I will anytime soon. This chapter was already published on https://m.fanfiction.net/ and the link was on my "Conversations" page, if you checked it then you've already read this.
As Aizen lay in his room late at night, he couldn't help but feel a sense of excitement coursing through him. He had finally gained access to a new power, "Dimension Teleport," that would allow him to train for days, even weeks, in his own dimension while only a few hours passed in the real world. This would be the perfect opportunity to hone his skills and prepare for the challenges that lay ahead.
Closing his eyes, Aizen focused his energy and said the words, "Dimension Teleport: Time -Infinite!" Nothing happened. A moment of frustration passed before he tried again, this time saying, "Dimension Teleport: Time -1000000." Still nothing. Aizen's lips twisted into a scowl as he muttered under his breath. He tried one more time, saying, "Dimension Teleport: Time -100." This time, a portal opened up before him.
If he was right, then time would flow 100 times slower in this dimension than in the real world. That meant he could train for 25 days here and only 6 hours would pass in the real world. Aizen stepped through the portal, his heart beating faster with anticipation.
As he looked around, Aizen saw that the dimension was filled with trees, a green field, and flowers. It was beautiful, and he couldn't help but feel a sense of peace and contentment wash over him. But his peaceful reverie was soon interrupted by a bright light that engulfed the entire dimension.
When the light faded, Aizen saw that he was not alone. Standing before him was Kami.
"We meet again, Aizen Sōsuke," Kami said, a smile on her face. "How have you been?"
Aizen felt a sense of unease wash over him. "That is unnecessary," he said. "Now tell me: why have you come here?"
Kami's smile faded slightly, but she didn't seem offended by Aizen's coldness. "Aw, that's quite a cold greeting," she said. "Anyway, I came here to tell you about your powers. They require certain requirements to unlock. I will tell you what powers are possible to unlock. But first I shall provide you with information of this world. Here you go" Kami said and tapped Aizen's forehead, a bright light engulfed the dimension and after the light vanished nothing changed.. From the outside at least, inside Aizen's mind, a load of information just entered his mind.
After the information was sorted out -
"First is the Rinnegan, but unfortunately, I can't tell you what the requirements are because that is forbidden."
Aizen's eyes widened. The Rinnegan was a legendary power that many had sought after for centuries. He couldn't believe that it was within his reach. But then a smile peaked his lips
Kami continued, "You can maybe unlock the Rinne-Sharingan, but that's just a small chance. And there are many more; I can't tell them all, that will take a lot of time."
Aizen's mind was blown, the Rinne-Sharingan is a power that's not possible to unlock without Ōtsutsuki blood, but he has a chance of unlocking it, even if it is small. There is still a chance.
As Kami spoke, Aizen's mind raced with possibilities. The power he could unlock, the things he could accomplish... it was all within his grasp.
"Oh! And here is a parting gift from the god of love," Kami said, and a pink light with a little bit of red in it engulfed Aizen.
"What is this power the god of love gave me?" Aizen asked.
"Oh, it's just the power to make one person fall in love with you. It only works once, so use it wisely," Kami said before vanishing. Aizen felt a smirk form on his lips. This power could prove to be quite useful in the future.
But first, he had to train. "Let's get to training," he said to himself. "This body is still weak. But I can make use of that fox. I just need a certain eye."
"I can sense your thoughts," Kurama said. "There's no need for the sharingan. I've decided that you are worthy of my power, and thus I shall cooperate with you."
Aizen was surprised. "Wait, you have no seal?" he asked.
"No, the shinigami gave me a warning and he didn't seal me, he just put me inside you," Kurama said. "My name is Kurama."
"Okay then. Kurama, you shall help me forever and I shall reward you. I can free your brothers and sisters. Is that a deal?" Aizen asked, knowing exactly where to hit.
"Yes, that's all I ask for. We shall begin training; let's start with physical training. I shall fuse with you. It will take one week, but the longer you go, the better it is. If it's past 500 years, then it can increase your chakra pool by a lot," Kurama said.
"In this dimension, time moves 10000 times slower than usual," Kurama added.
"Well, that's a good thing. Since I was also in a dimension where time moves 100 times slower, I can train with you for 6.944({100*10000*6}÷24÷30÷12÷10÷10) centuries. That's a lot," Aizen said
"Alright, I am going to do it. Well then, see you 694 years later," Aizen said and fell unconscious.
"Oh, and you're going to feel unimaginable pain," Kurama said. "It's going to multiply by two every year. And every 100 years, it's going to multiply by 1000. Every 690 years, it's going to divide by 0.00069. In short, you're going to feel unimaginable pain, but it's amplified by 2011594202.9 times. You're going to survive because you're immortal, but still, it's going to hurt very badly. Good luck." Aizen didn't say anything, but he couldn't help but wonder what he had gotten himself into.
690 Years Later(In Aizen's mindset) -
He was screaming like crazy. The pain was unbearable, and he felt like he was being torn apart from the inside out. He couldn't think, couldn't breathe, couldn't do anything but scream.
Last day of Torture -
On the last day of his torture, Aizen finally woke up. He had gone back to his appearance before 'reincarnating'. "That was like hell. The last few days were worse than hell itself, but in return, I got my previous appearance back. I can't stay in this form in the real world. I have to find some way to go back to Naruto Uzumaki's form," Aizen said. "Welcome back," Kurama said. "You can use transformation jutsu." "Ahh, that's a good idea"
Note: Aizen is gonna be a bit OOC in this
"Ahh, that's a good idea," Aizen said. He transformed into Naruto and said, "Good, now I can continue my job."
Aizen knew he had changed during his time in training. The pain and suffering had hardened him. He had spent countless hours in there, pushing his body to its limits in order to become stronger. The harsh training had taken a toll on him, but it had also made him more determined than ever to achieve his goals. Aizen knew that in order to succeed, he needed to become the best ninja he could be.
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That's it for this chapter, next chapter "Chapter IV". See you next time.