Sasuke could be in a state of extreme rage or confusion. He may not be fully aware of what he's doing. Hinata just happens to be there, and in his muddled state, he sees her as an easy target. But Naruto, of course, won't let that happen and saves her.
Maybe Sasuke is being manipulated by an evil force that wants to get at Naruto through Hinata. Since Hinata is important to Naruto, targeting her would be a way to hurt Naruto.
Well, in one possible scenario, Sasuke might be under some sort of dark influence. Naruto, being the hero he is, senses Hinata is in danger from Sasuke. Naruto arrives just in time, using his newfound powers, perhaps a combination of Sage Mode and his Nine - Tails chakra. He blocks Sasuke's attack aimed at Hinata and then tries to reason with Sasuke, reminding him of their past friendship and how Hinata is an innocent bystander. Eventually, Sasuke relents and Hinata is saved.
One possible fanfiction scenario could be that Hinata, Sasuke and Naruto are on a difficult mission together. They start off with some tension due to Sasuke's past actions. However, as the mission progresses, they learn to trust each other more. Hinata might use her gentle nature to ease the situation between Naruto and Sasuke. Naruto's determination and Sasuke's skills combine with Hinata's support to make them a formidable team in this fictional adventure.
A really interesting one is 'The Unlikely Trio'. This fanfiction imagines a mission where Naruto, Hinata, and Sasuke are forced to work together in a very dangerous and isolated place. They have to rely on each other's strengths and overcome their differences to survive, which makes for a really engaging read.
One idea could be a story where Sasuke, Hinata and Naruto are on a joint mission. Naruto's cheerfulness, Hinata's gentle strength, and Sasuke's brooding nature create an interesting dynamic. They face a powerful enemy and have to learn to combine their unique skills, like Naruto's Rasengan, Hinata's Gentle Fist, and Sasuke's Chidori, to defeat it.
One possible motive could be related to power. Maybe Sasuke thinks that Hinata has some sort of connection or knowledge that could help him gain more power. For example, her Byakugan might be of interest to him in terms of seeing things that he couldn't otherwise. Another motive could be a misdirected sense of revenge. He might believe that Hinata is somehow connected to someone he wants to get back at. It could also be a plot by an outside force that is controlling Sasuke to kidnap Hinata, perhaps for some kind of experiment due to her unique abilities.
Well, one possible plotline could be that Sasuke is under some sort of dark influence, like a powerful genjutsu or a curse, which makes him act out of character and abuse Hinata. Another could be a misinterpretation of Hinata's actions by Sasuke, leading to his aggression. However, this is a very dark and uncharacteristic concept for the original Naruto series.
It might be for Naruto's own good. Sasuke may believe that Naruto is on a dangerous path that will lead to his downfall. So he captures him to keep him from making bad decisions, like sacrificing himself for the village or something similar. He wants to save Naruto from himself in a sense.
I'm not sure if there is such specific fanfiction. Fanfiction can cover a wide range of wild and unexpected scenarios, but this one seems rather unethical considering the original relationships in the Naruto series. It's also not in line with the positive and loyal characters' personalities in the original work.
There's this fanfiction called 'Hidden Feelings'. It focuses on the unspoken emotions among Naruto, Sasuke, and Hinata. The author does a great job of creating a world where Hinata's feelings for Naruto are tested when Sasuke re - enters their lives. It's a story full of drama and heart - warming moments.
There are likely fanfictions out there with such a plot, but this goes against the main canon of the Naruto series. Fanfiction often explores alternative storylines, but many fans might find this particular concept unappealing as Hinata is typically seen as very loyal to Naruto in the original story.