It could also occur because of a deep emotional realization. Maybe Sasuke has a moment where he realizes that all his pursuit of power has left him empty, and he looks back at the pure friendship he had with Naruto. Naruto, on his part, has always wanted Sasuke back. He might find Sasuke in a moment of vulnerability and simply offer his friendship again without any judgment. This sincere offer could break through Sasuke's defenses.
One way their reconciliation could happen is through a common enemy. For example, if a new and powerful foe threatens the Hidden Leaf Village and the entire ninja world. Naruto and Sasuke would be forced to put aside their differences and work together. Their shared love for their village and the people in it would be a strong motivation. They might start by grudgingly collaborating on battle strategies, but as they face challenges together, they would gradually remember the bond they once had as friends.
The ninja world would become more united. With Naruto and Sasuke as friends again, the two most powerful ninjas in the world would be a symbol of peace and cooperation. Other villages would be more likely to form alliances and work together on issues like trade, security, and sharing of ninja techniques. The threat of war would be significantly reduced as no village would want to mess with the combined power of the Hidden Leaf Village led by Naruto and Sasuke.
In fanfiction, Naruto and Sasuke might become friends when they have to protect someone important to both of them. Let's say it's a young orphan who reminds them of their own difficult pasts. Naruto's positive attitude and Sasuke's protective nature would kick in. They would work together to keep the child safe. Through this shared experience and the emotions it stirs, they start to see each other in a new light and become friends.
In some fanfictions, Naruto might be indifferent to Sasuke if the author wants to explore a different dynamic. Maybe Naruto has had a life - changing experience that makes him focus more on other things like the well - being of the village as a whole rather than just Sasuke. It could also be due to a misunderstanding or a new friendship that overshadows his previous intense connection with Sasuke.
In a fanfiction scenario, perhaps a love interest could be a cause. If Naruto fell in love with someone who had a strong hatred for Sasuke, and Sasuke refused to make amends or change his ways for Naruto's sake, it could create a rift. Also, if Sasuke's power-hungry nature made him try to steal Naruto's power source, like the Nine - Tails, it would be a huge betrayal and could result in Naruto severing their bond.
Maybe in this fanfiction, a powerful enemy attacks the village and Naruto and Sasuke are the only ones who can stop it. In the process of fighting together, they start to understand each other's pain and dreams better. They see how much they have in common and gradually start to think of each other as brothers.
In some fanfiction concepts, Sasuke might betray Naruto due to his unwavering pursuit of power and a different view of the ninja world. Sakura could be involved perhaps out of misguided loyalty to Sasuke. It could start with Sasuke believing Naruto is a hindrance to his goals and Sakura following Sasuke's lead, breaking Naruto's trust.
They could go on a journey to find a way to heal any negative effects of the Sharingan on Sasuke. Naruto would be by his side every step of the way, providing emotional support. As they travel, they face various challenges, and Sasuke uses his Sharingan to analyze the situation while Naruto uses his brute strength. Their combined efforts make them an unbeatable team.
Well, in some fanfictions, when they meet again, Sasuke and Sakura could go on an adventure together. They might face new enemies and in the process, rekindle their relationship. Sasuke could show his protective side for Sakura more than ever, and Sakura would be there to support Sasuke both emotionally and in battle.
Sometimes in fanfictions, character development takes a dark turn. The friends might have their own personal goals that conflict with Naruto's. They could see Naruto as an obstacle to achieving those goals. Or perhaps there was a long - hidden secret that came to light, which made them change their attitude towards Naruto, leading to the so - called betrayal.
One possibility is that Naruto might have made a great sacrifice that his friends didn't fully understand at first. Maybe he had to go on a dangerous mission alone and was presumed dead. His friends, in their grief and shock, gradually started to forget about him as they moved on with their lives. For example, they could have been so focused on protecting the village from new threats that they didn't have time to dwell on Naruto's absence.