In a fanfiction where Naruto and Hinata join Orochimaru, one possibility is that they are forced into it. Maybe Orochimaru has some kind of leverage over Konoha that makes them comply. Naruto, being the head - strong character he is, would likely be constantly looking for a way to escape and take Hinata with him. Hinata, on the other hand, would probably be more reserved and observant, trying to find Orochimaru's weaknesses.
On the other hand, their relationship could also grow stronger. They would be relying on each other more in this new and dangerous situation. Naruto would be even more protective of Hinata, and Hinata would be a source of comfort for Naruto. They would have to communicate and trust each other more deeply to survive in Orochimaru's lair.
Well, one possible plot could be that they join initially to spy on Akatsuki from the inside. Naruto might think he can change the Akatsuki members' minds with his talk - no - jutsu. Sasuke could be there to find out more about the secrets Akatsuki is hiding, especially those related to his family. Maybe they end up causing chaos within Akatsuki as they slowly turn some of the members towards a more positive path.
In fanfiction, Naruto joining Orochimaru could make him a more complex character. He'd be exposed to Orochimaru's unethical practices, which could make him question the ninja world's values. He might develop a darker side, but also a deeper understanding of the gray areas. Sasuke would experience a transformation too. His relationship with Orochimaru would be a strange mix of mentorship and power struggle. He could become more ruthless, but also more calculating. His interactions with Naruto in this new setting would be full of tension and moral dilemmas.
In fanfiction, the relationship between Sasuke and Orochimaru is often complex. Orochimaru saw Sasuke as a vessel for his own resurrection or as a powerful tool. Sasuke, on the other hand, initially sought power from Orochimaru to avenge his clan. However, Sasuke was always cautious and didn't fully trust Orochimaru. This dynamic creates a lot of interesting plot points in fanfiction, such as Sasuke's internal struggle between his desire for power and his awareness of Orochimaru's true intentions.
One possible motive could be the pursuit of power. Orochimaru is known for his vast knowledge of jutsu. Naruto might think that by joining him, he can gain the strength needed to protect his village better or to bring Sasuke back more effectively.
Well, in such a fanfic, Naruto joining Orochimaru would be a huge shock to the Naruto -verse. Orochimaru has always been an enemy, so for Naruto to side with him would mean a major shift in the power dynamics. Naruto could learn a great deal about the darker side of the ninja world, but he'd also be in constant danger of being used by Orochimaru for his own purposes. It would be a very different Naruto story, full of moral dilemmas and unexpected alliances.
A plot twist might be that Naruto and Sasuke discover a hidden agenda Orochimaru has that involves someone they care about deeply. For example, they find out he's planning to use Sakura as a sacrifice for some dark ritual. This would force them to quickly come up with a plan to rescue her and stop Orochimaru once and for all.
Well, perhaps Naruto and Sasuke are forced to join Orochimaru. Maybe Orochimaru has some kind of leverage over Konoha that makes them comply. In this fanfiction, they could start to learn unique jutsus from Orochimaru but also have to constantly resist his more evil intentions. They might also meet some interesting characters within Orochimaru's lair.
Naruto's character might develop a stronger sense of purpose. Saving Sasuke becomes more than just about their friendship; it could be about righting a wrong in the ninja world. His resolve to save Sasuke would make him train harder and become more strategic in his battles.