They would become more protective of each other. Neji, being the older (or at least more experienced) one, would likely feel a sense of responsibility for Sakura. Sakura would look up to Neji and his skills. For example, in a fight, Neji would instinctively move to shield Sakura from harm, and Sakura would do whatever she could to support Neji, like healing his injuries immediately.
As siblings, they would have a different kind of loyalty. It would be a family - based loyalty. They would be more likely to forgive each other's mistakes easily. If Sakura made a wrong decision during a mission, Neji would be more lenient and help her correct it rather than just criticize. And Sakura would be more accepting of Neji's sometimes - cold exterior, knowing that he has a soft spot for her as his sister.
Their relationship as siblings would mean Naruto might not be so obsessed with winning Sakura's love. This could change his focus and make him more dedicated to protecting their family. Sakura, on the other hand, would be more protective of Naruto from the start. It could also lead to different team dynamics in their ninja teams.
One possible plot could be that they discover their sibling relationship later in life. Maybe there's a mystery around their family that gets uncovered. For example, Neji could have been separated from his family early on due to some clan politics. Sakura, on the other hand, grew up not knowing she had a brother. When they find out, they have to adjust to this new reality and face the reactions of their friends. Neji might be protective of Sakura in a different way now, and Sakura could learn more about her family's past through Neji.
At first, they might be a bit at odds, as they have different personalities. But as they face challenges in the past, they start to rely on each other more. Neji's calm and strategic thinking complements Sakura's determination and quick - thinking in medical emergencies. They gradually develop a mutual respect and a deeper friendship.
They would become more protective of each other. Naruto, who has always been protective, would be even more so now that Sakura is carrying their child. Sakura, on the other hand, would be more aware of Naruto's safety as well, knowing that their family depends on him.
Well, their relationship as brothers would likely make Naruto more protective of Neji. In the original story, Naruto was always trying to prove himself to Neji. But as brothers, he would be more concerned about Neji's well - being. This could change the way battles play out, as Naruto might take more risks to keep Neji safe.
In the high school fanfiction, Neji and Sakura's relationship could develop in a rather unexpected way. Suppose there is a school dance. Sakura is all excited about it but doesn't have a partner. Neji, who is not really into such social events, is somehow convinced to go. They end up being dance partners. At first, it's a bit awkward, but as they talk during the dance, they find out that they have a lot in common. They both have big dreams for their future as ninjas and are willing to work hard to achieve them. This dance could be the starting point of a closer relationship, where they start to hang out more often and support each other in their school and ninja - related activities.
Their relationship would change in many ways. They would start sharing more responsibilities, like taking care of their home. Neji might rely more on Tenten's opinions and vice versa. There would also be a new level of intimacy. They would know each other on a more profound level, and this could lead to a stronger emotional bond. They would also have to deal with the expectations of their friends and family as a married couple.
Their relationship would become more domestic. They would have to rely on each other more for daily things. For instance, Syaoran might cook breakfast for Sakura on some days, and Sakura would do the laundry. They would also be more open with their feelings, not holding back like when they were just dating.
Their relationship would become more intimate in a different way. Instead of just the bond of comrades or lovers, they'd now be parents - to - be. Sasuke would likely become more protective of Sakura.
In this fanfiction scenario, their relationship would be a game - changer. Naruto would have a family connection from the start, which could impact his search for recognition. Sakura, as his sister, would likely be more involved in his growth and training. Their combined skills and the support they give each other could lead to them taking on different challenges in the Naruto universe. They could also form a stronger front against common enemies.