In this kind of NaruHina fanfiction, it might be that Sasuke has returned to the village after a long time away, but his attitude towards Naruto and Hinata's relationship is dismissive. Naruto, who is now very protective of Hinata, can't stand Sasuke's behavior. So, when Sasuke challenges Naruto about his relationship with Hinata, Naruto snaps and beats him up. This event could then be a turning point in the story, making Naruto more determined to build a future with Hinata and causing Sasuke to re - evaluate his own views.
Well, in such a fanfiction, perhaps Sasuke has some sort of plan that involves Hinata in a negative way. Naruto discovers this and decides to beat up Sasuke to protect Hinata. It could also be part of a bigger struggle where Sasuke's actions are seen as a threat to the future Naruto envisions with Hinata, so Naruto takes matters into his own hands to stop him.
Hinata might be shocked at first. She is a gentle soul, so seeing Naruto be so violent towards Sasuke would be unexpected. But then she would probably try to stop Naruto, as she doesn't like to see people fighting. She might also feel a bit guilty, thinking that her relationship with Naruto somehow caused this conflict between the two friends.
Maybe Sakura gets angry at Naruto for some misunderstanding, like he accidentally ruins one of her important medical experiments. So she decides to beat him up to teach him a lesson.
One possible reason could be to protect Hinata. Maybe Sasuke has unknowingly made a move or decision that Naruto perceives as a threat to Hinata, so he scares Sasuke to make him back off.
Maybe Sasuke says something really offensive about their past or her skills, and Sakura just snaps and starts beating him up.
One possible reason could be a misunderstanding. Maybe Sakura makes a decision that Naruto strongly disagrees with regarding the safety of the village or their friends. For example, if Sakura decides to trust an enemy without Naruto's knowledge, Naruto might get so angry that he lashes out at her.
One possible reason could be a simple rivalry that has boiled over. Maybe they were competing for the same mission, and Naruto's determination to prove himself got the better of him. He might have seen Kiba as a threat to his goal of becoming Hokage, thinking that if Kiba succeeds in a high - profile mission, it could overshadow his own achievements.
One possibility is that Naruto's win would cause a stir in the ninja academy. His peers would start to study his techniques more closely. Kakashi might also take a different approach in training them. As for Sasuke, he could become more withdrawn, focusing all his energy on getting revenge on Naruto for this defeat. This would add a new layer of conflict to their relationship and the overall story.
One possible plot could be that Naruto and Sasuke, having grown up together, become the ultimate team in protecting the Hidden Leaf. They combine their skills and knowledge to face new threats that are far more powerful than anything they've encountered before. They might also have a deeper understanding of each other's past traumas and work together to heal those wounds while strengthening the village.
Well, one possible plot could be that Itachi, seeing Naruto's loneliness and potential, decides to adopt him. This could lead to Naruto having a new sense of family and Itachi guiding him in his ninja training. As for Naruhina, Itachi might play a role in bringing them closer, perhaps by setting up situations where they have to work together and get to know each other better.
In this fanfiction, perhaps there is a misunderstanding between Luke and Percy. Luke might think Percy has betrayed him in some way, like siding with the wrong people in the context of their fictional world, and thus resorts to violence by beating him up.