Perhaps a plot where Hanabi is framed for a crime she didn't commit. Naruto believes in her innocence and sets out to prove it. They have to investigate the real culprit while also dealing with the distrust of the village towards Hanabi. This would create a lot of drama and tension in the fanfiction.
A plot idea could be that Hanabi discovers a new power within herself and Naruto helps her to master it. This could involve them training together and facing some challenges during the training process.
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.
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.
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.
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 congratulates Hanabi on becoming a strong ninja. Maybe she has just achieved a new rank or mastered a difficult jutsu. Naruto, being the friendly and encouraging person he is, throws a small celebration in the Hidden Leaf village for her. He gives a speech about how he has seen her grow and how proud he is of her progress.
Perhaps in the fanfiction, Hanabi becomes Naruto's maid as part of a mission. The Hyuga clan wants her to keep an eye on Naruto for some reason. Hanabi initially resents this role but as she spends time with Naruto, she sees his kind heart and his determination to protect the village. This changes her perspective and she becomes more dedicated to being his maid and also his friend.
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 a story where Naruto, Hinata and Hanabi go on a mission together. They face a powerful enemy and have to rely on each other's unique skills. Naruto uses his Rasengan, Hinata her Byakugan and gentle fist techniques, and Hanabi shows off her improved skills compared to her sister. Through this adventure, they grow closer as friends and Naruto might start to see Hanabi in a different light too, while still being in love with Hinata.
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.