One possible plot could be that Naruto accidentally gains the ability to control Hinata's body due to some strange jutsu gone wrong. He then has to figure out how to reverse it while dealing with the situations Hinata was in at the time. For example, if she was in the middle of a mission, Naruto has to complete it through her body without anyone suspecting.
Well, one possibility could be that Naruto discovers a new power related to silver. Maybe it's a special type of chakra that he can control and it gives him unique abilities like creating silver - based weapons or shields. He could use this new power to defeat powerful enemies or to protect his village in a different way than he usually does.
It could be that Hinata publicly humiliates Naruto. She might expose some of his deepest insecurities in front of the whole village. Since Naruto has always been striving for the village's acceptance, this betrayal from Hinata, who he loves, would be a huge blow to his heart.
One possible consequence could be a change in Naruto's power level. If Hinata can control the seal, she might be able to regulate the flow of power from it, which could either enhance or limit Naruto's abilities.
One possible plot development could be Naruto having to deal with Sasuke's relationships. For example, he'd have to interact with Sasuke's friends in a different way than Naruto would normally. He might also discover new things about Sasuke's past that even Sasuke himself was not fully aware of. And Naruto's own skills and abilities might be affected by being in Sasuke's body, leading to some interesting battles or training sessions.
Perhaps Naruto is cursed and transformed into an animal. Hinata, being kind - hearted, takes him in as a pet. Along the way, Naruto, in his animal form, still has his ninja skills and tries to communicate with Hinata. Hinata starts to understand him better than ever, and they develop a unique bond that is different from their normal relationship in the original story. It could also involve Hinata having to hide Naruto from other ninjas who might see him as a strange or dangerous creature.
Perhaps in the fanfiction, Naruto punishes Hinata because he thinks she's being too overprotective of him. He might tell her to stay away from him during battles for a while. However, Hinata then gets into trouble on her own mission, and Naruto realizes that her 'overprotectiveness' was actually her way of showing love and care, and he feels bad for his punishment.
One possible plot could be that Naruto and Hinata face a new threat to the Hidden Leaf Village. They have to work together, with Hinata using her Byakugan skills to detect the enemy's movements and Naruto using his Nine - Tails chakra for powerful attacks. Along the way, they also focus on raising their family, teaching their kids the importance of ninja values.
One possible plot could be that Naruto and Hinata find out about the pregnancy and they are both overjoyed. They start preparing for the baby's arrival, with Naruto being super protective of Hinata. He might go on missions less often to be around her. Hinata, on the other hand, could be seen knitting baby clothes and daydreaming about their future family life.
It could also be a misunderstanding. Hinata might be under some sort of mind - control or false impression. For example, an illusion is cast on her that makes her believe Naruto has become evil. As a result, she takes actions against him that he perceives as betrayal. In this case, once the truth is discovered, they would likely reconcile.
Well, perhaps in the fanfic, Naruto is away on a mission when Hinata discovers she's pregnant. She then has to deal with the initial shock and excitement all by herself. But she's strong, and she starts taking care of herself and the unborn baby. When Naruto returns, he's overjoyed and vows to protect his family even more fiercely. And they could have a little ceremony in the village to celebrate the upcoming addition to their family.