One possibility could be that they are being mind - controlled. Maybe an enemy has found a way to manipulate them into attacking their own village. They might be used as pawns to create chaos in Konoha.
Perhaps there is a powerful and dark force that has threatened the lives of their loved ones, like their children, if they don't attack Konoha. Naruto and Hinata are very family - oriented, and in order to protect their family, they might be forced to do something as drastic as attacking their own village. But they would surely be trying to find a way to expose the real threat and save Konoha at the same time.
Maybe a plot where there's a new student at Konoha High School who seems to be a threat to the harmony. Naruto, being the hero - like character, steps up to figure out what's wrong. Hinata, secretly in love with Naruto, supports him from the sidelines at first. But as the situation gets worse, she also joins in, and together they solve the mystery and in the process, their relationship blossoms.
One possible reason could be to seek a new life away from the politics and pressures of Konoha. Maybe they feel restricted by the village's rules and expectations. Another reason might be for a personal adventure. They could be in search of something that Konoha can't offer, like a new type of ninja training or a mysterious power source. Also, it could be related to protecting their family. If they sense some kind of threat to their family within Konoha, they might choose to leave to keep them safe.
Sasuke would likely be very conflicted. He has a deep bond with Naruto, and he would not want to fight him, but he also has loyalty to Konoha. He might try to reason with Naruto first before taking any aggressive action.
In such a fanfiction, they might leave Konoha to start a new life in a peaceful place. Maybe they are tired of the shinobi life full of battles and politics in Konoha. They could find a small village by the sea and build a simple house there, living a quiet life away from the chaos.
One possible plot is that there is a breach between the Naruto universe and the Hellsing universe. This causes chaos as demons from Hellsing start to invade Konoha. Naruto, being the hero, tries to figure out how to stop them. Alucard arrives, not entirely as an ally at first. But as they both realize the common threat, they join forces. Naruto learns about the different nature of the enemies from Alucard and adapts his ninja skills accordingly.
Perhaps the fanfiction could focus on Naruto's adjustment to the new environment in Konoha. He'd have to get used to the different training facilities, local customs among the ninja clans, and the overall layout of the village. For example, he might struggle at first to find his way around the various training grounds and meet - up spots for ninja teams. But as he explores, he discovers hidden gems in the village and forms closer bonds with the villagers.
It could also be a sparring session gone wrong. Naruto might be training with the Konoha 12, but his new and powerful techniques are too intense. This causes the others to feel threatened and they end up in a full - on fight. Naruto would then have to control his power and show his friends that he doesn't mean to harm them.
Well, it could be about Naruto being wrongly accused and turning against Konoha. Maybe some false evidence is planted against him, making the villagers see him as a threat. So he decides to oppose Konoha to clear his name.
In a 'naruto conquers konoha fanfiction', perhaps Naruto could be pushed to the edge by the corrupt system in Konoha. He might decide to take over to bring real change. He could use his powerful jutsu and the loyalty of his friends to overthrow the old regime and install a more just rule.
In a dark 'naruto executed by konoha fanfiction', it could be that Konoha, fearing Naruto's power, decides to execute him. Maybe they believe false rumors spread about him. It's a very tragic and dark take on the Naruto universe.