One possible plot could be that Naruto and Hinata discover a hidden part of their world where hanyou exist. They might have to team up with a hanyou to fight against an evil force that threatens their village. This could lead to Naruto and Hinata learning new skills and understanding more about the complex nature of the hanyou.
It could start with a strange phenomenon in the ninja world. Naruto and Hinata are in the wrong place at the wrong time and get caught up in it. As they become Hanyou, they discover that they can now communicate with certain spirits or demons. This new ability leads them to an ancient prophecy. They then have to figure out what the prophecy means and how it relates to their new forms. Their relationship also deepens as they rely on each other more in this new and dangerous situation.
Another plot could be that there is a prophecy about a hanyou and a Jinchuriki (Naruto) coming together to save the ninja world. Hinata's hanyou side is the key, and they must face many challenges and enemies who are afraid of their combined power. They would have to grow both as individuals and as a couple throughout this adventure.
Their relationship could develop as they both bond over their shared experience with the hanyou aspect. For example, if they have to protect a hanyou together, they grow closer through the trials and tribulations. Naruto might rely more on Hinata's gentle nature to deal with the more sensitive parts of the hanyou situation, like when they are trying to gain the trust of a scared hanyou.
Maybe they inherit some unique abilities from their Hanyou side. Naruto could gain enhanced speed and Hinata could get some sort of shadow - based power. They then use these powers to face a new, powerful enemy that the regular ninja skills of the village can't handle. This would put them in the spotlight and they would have to prove that being Hanyou is an advantage rather than a curse.
At first, Naruto might be a bit shocked when he finds out about Hinata's hanyou side. But then he would start to see her in a new light. He could encourage her to be more confident in herself, which would deepen their bond.
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.
Well, it could be that Naruto made a really stupid mistake that hurt Hinata's feelings deeply. Maybe he accidentally said something really mean about her family or her skills in front of everyone. So in a fit of anger, Hinata slaps him to show her extreme disappointment.
Well, perhaps in the fanfiction, Naruto's Kitsune Hanyou side starts to emerge during a battle. Hinata is the first to notice the change in him. This could lead to a story where Naruto struggles to control his new powers at first. Hinata, using her Byakugan and her understanding of Naruto, helps him. They might then have to deal with the political implications of Naruto being a Kitsune Hanyou in a world that has some prejudices against such beings. Their love story could develop as they break down these barriers and prove that Naruto's new identity is not a threat but a strength.