A possible plot is that Hanabi discovers a new chakra - related technique and Naruto, being the curious and helpful person he is, offers to train with her to help her master it. Through their training sessions, they share their experiences, dreams, and fears, and a deep friendship forms. Maybe there could be some light - hearted competition between them as well, which adds an interesting dynamic to their relationship.
One idea could be that Naruto, having known Hanabi since she was younger, starts to see her in a new light as she grows older. Maybe Hanabi has become a strong kunoichi and they team up on a difficult mission. During the mission, they face many challenges that make them rely on each other more and more, and Naruto realizes his feelings for her are changing.
There could be a story where Naruto is sent on a diplomatic mission to Koyuki's kingdom. They start off with misunderstandings but gradually come to respect and trust each other. As they work together to solve political issues between their two lands, they form a strong bond. This kind of plot would focus on their characters and the world - building around them rather than any adult - themed content.
One idea could be a story where Naruto has to team up with Zetsu to face a new, powerful enemy that neither can defeat alone. They start off distrusting each other but gradually learn to work together and understand each other's motives.
Maybe in the fanfiction, Boruto discovers a secret about Hanabi's past that she has been hiding from everyone. This secret could be related to her training or a special power she has. Boruto then helps her face this secret and together they use it to protect the village from a new threat. It could show their growth as characters and how they support each other.
One idea could be that Saiyan Naruto, with his enhanced powers, has to protect Hanabi from a new and powerful enemy in the Naruto world. Maybe an ancient evil that was sealed away long ago has been released and Naruto's Saiyan abilities give him an edge in the fight. Hanabi could also be on a journey to master a new form of her own jutsu, and Naruto helps her along the way while they develop a deeper bond.
In some fanfictions, there could be a plot where Hinata and Hanabi are sent to train with a very strict and powerful sensei. This sensei challenges their limits and helps them grow in ways they never expected. The story could focus on their struggles, their determination to improve, and how their relationship as sisters evolves during this training. It could also include some flashbacks to their childhood and how they overcame past difficulties together.
Another interesting plot could be that they both get involved in training a new generation of Hyuga kids. Hinata with her gentle and patient approach and Hanabi with her more strict and disciplined style. They learn from each other's teaching methods and also help the kids develop their unique skills within the Hyuga clan's abilities.
One idea could be that Naruto and Yukino team up to train a new generation of ninjas. They combine their different skills and teaching methods to bring out the best in the young ones.
One idea could be that Naruto, after becoming Hokage, realizes his feelings for both Hinata and Hanabi. Hinata is his long - time admirer and Hanabi has grown to respect and love Naruto in her own way. They could all go on missions together where they face challenges that make their relationships deeper, like fighting a powerful new enemy that targets Konoha. Naruto has to balance his duties as Hokage and his relationships with the two sisters.
One idea could be that the fem naga is a guardian of an ancient relic that Naruto needs to protect the village. They start off as strangers but gradually learn to trust each other as they face various enemies trying to steal the relic.