One possible plot could be that the reader is a new ninja in the Naruto world. They accidentally stumble upon Kaguya's hidden lair. Kaguya, instead of seeing the reader as a threat, is intrigued by this new presence. She decides to test the reader's skills and knowledge. The reader, in turn, has to use their wits and any ninja techniques they've learned to survive and perhaps even gain Kaguya's respect.
Well, it could involve Naruto having some unique powers inherited from Kaguya. Maybe he discovers his true lineage gradually and has to deal with the expectations and the secrets that come with it. He might face new enemies who are interested in his connection to Kaguya, or he could use his new - found heritage to bring about a new era of peace in the ninja world.
Well, one possibility could be that Naruto, with his Saiyan powers (assuming some sort of crossover mechanic), has to deal with Kaguya in a new way. Maybe he forms a harem that includes characters related to Kaguya's story. The plot could involve battles against new threats while also exploring the relationships within the harem.
The relationship could start with fear. The reader, knowing of Kaguya's power, would be afraid. But as they interact more, they might find a sense of pity for Kaguya, who has been alone for so long. This could lead to a more understanding relationship.
One possible plot could be a crossover where a Saiyan somehow ends up in the Naruto universe during the time of Kaguya. Maybe the Saiyan's power is sensed by Kaguya and she sees it as a threat or an opportunity. The Saiyan, with their battle - hardened nature, could get involved in the Naruto characters' fight against Kaguya, adding a new dimension of power and strategy to the battle.
Maybe in the fanfic, Naruto, as a genin, has to face an enemy who was once an acquaintance of Kushina. He uses the stories he has heard about her to outwit the enemy. He could recall how Kushina was known for her quick thinking and apply that to his battle strategy. This would not only be a way to defeat the foe but also a way to connect with his mother on a deeper level.
One possible plot could be that Samui, a character from Naruto, is involved in a mission where she has to deal with a mysterious 'hinta' which could be some sort of valuable item or a secret code. Along the way, she teams up with other Naruto characters, and they face various challenges to uncover the truth about 'hinta' and protect it from falling into the wrong hands.
One possible plot could be that Naruto accidentally stumbles upon Hinata in the hotspring. Hinata is initially shy and embarrassed, but Naruto, being his oblivious self, doesn't fully understand the situation at first. Then they start having a conversation about their ninja training and goals, which deepens their bond. And Hinata realizes that Naruto has a newfound respect for her as a strong ninja.
The plot could involve Naruto delving into the history of his family and Kaguya's past. He could learn secrets that were long buried, and this knowledge could be used to either save the ninja world from a new threat or to bridge the gap between different ninja clans that have been at odds because of Kaguya's actions in the past. Naruto's new status as Kaguya's brother could be a catalyst for great change in the Naruto universe.
Well, it could be that Naruto is in a near - death situation, poisoned or severely injured. Kaguya, having a change of heart, decides to save him. She might use her chakra to heal Naruto's wounds and restore his strength. It could also be that Kaguya saves Naruto from a trap set by an ancient evil that she has knowledge of. She steps in because she realizes Naruto's importance in the balance of the ninja world.
One possible plot could be that Naruto, in his godlike state, tries to understand Kaguya's past and motives more deeply. He might use his newfound power to communicate with her on a different level, perhaps even showing her a different way of seeing the world. This could lead to a redemption arc for Kaguya, where she starts to regret her past actions.