In a Naruto serves Orochimaru fanfiction, the plot could revolve around Naruto's growth in a different environment. Orochimaru might see Naruto as a valuable asset not just for his power but also for his unique ability to make friends and gain loyalty. Naruto, while serving, could learn different jutsu or ninja techniques from Orochimaru's side. However, he would constantly be at odds with Orochimaru's evil intentions. He might try to influence Orochimaru's followers to turn away from the dark path, which would create a lot of internal conflict within Orochimaru's organization.
Well, Naruto serving Orochimaru in fanfiction might involve Naruto being put in a situation where he believes he has no other choice. Orochimaru could be using some powerful jutsu or artifact that Naruto needs to access for a greater good, like saving the entire ninja world. So, he has to work under Orochimaru's command for a while. And during this time, Naruto would have to struggle with his own moral code as he's associated with a known villain.
One possible plotline could be Naruto being forced to serve Orochimaru due to some sort of blackmail or threat against his friends in Konoha. Maybe Orochimaru has some information that could endanger Naruto's loved ones if he doesn't comply. Another aspect could be Naruto initially pretending to serve while actually trying to find a way to take Orochimaru down from the inside. This would add an element of mystery and deception to the story.
Another aspect could be the psychological impact on Sasuke. Orochimaru's abuse might make Sasuke question his own worth and his path. He could be constantly in a state of fear and self - doubt, and the fanfiction could explore how he overcomes these negative emotions and finally stands up against Orochimaru.
A possible plotline could be Orochimaru's redemption. He realizes the error of his ways and joins Naruto in protecting the ninja world. He could use his vast knowledge of jutsu and forbidden arts to help Naruto against new threats.
Perhaps Naruto starts to have a connection to Orochimaru's other experiments or creations. He might find himself in a situation where he has to either help or fight these other 'products' of Orochimaru's mad science. Also, the fanfiction could explore how Naruto's friends react to what has happened to him. Do they trust him still? Or are they afraid of what Orochimaru might have turned him into?
Another plotline could be that Orochimaru is forced to train Naruto. Maybe the Hidden Leaf Village has some sort of leverage over Orochimaru. During the training, Naruto discovers some dark secrets about Orochimaru's past and his experiments. This knowledge could help Naruto in his future battles not just against Orochimaru if he turns on him, but also against other enemies who might have similar ideas. Naruto might also gain some new physical abilities from Orochimaru's training, like enhanced speed or strength.
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.
Perhaps the female Naruto joins Orochimaru because she wants to learn more about the secrets of the ninja world that she believes Orochimaru can unlock. She may be curious about the darker aspects of ninjutsu that are not taught in the normal ninja academies. But then she discovers that Orochimaru is using her for his own immoral experiments. She then teams up with some of Orochimaru's former followers who also want to break away and they plot to take him down from the inside.
One possible plotline could be that Sakura, perhaps under the influence of some dark force or a misunderstanding, physically attacks Naruto. This could be due to a false belief that Naruto has done something terrible to their village or friends. Another plotline might involve Sakura's words hurting Naruto deeply. For example, if she tells him that he will never be good enough or that she doesn't really consider him a true friend after all. It could also be that Sakura's actions in pursuit of Sasuke end up causing Naruto pain indirectly, like if she constantly ignores Naruto's feelings for her while she chases Sasuke, making Naruto feel unimportant and hurt.
Another plotline could be a more psychological exploration. Orochimaru has always been a bit of an enigma, and his love for Naruto could be a way to explore his own humanity. Maybe he has a change of heart because of Naruto and starts to question his past actions. This could lead to a journey of self - discovery for Orochimaru, while Naruto is left to figure out how to deal with this new side of his old enemy.
Well, in such a fanfic, a plotline might involve Naruto's friends trying to rescue him. They could discover Orochimaru's lair where Naruto is being experimented on. Meanwhile, Naruto himself could be developing new and unexpected powers as a result of the experiments, which he then has to learn to control. And there could be a race against time for Naruto's friends to reach him before Orochimaru's experiments cause irreversible damage.