One possible fanfiction could be that Orochimaru in his snake form slithers around Sakura while she is in a forest training. Sakura, being the strong - willed ninja she is, doesn't show fear but instead tries to analyze Orochimaru's motives. She might be on a mission to retrieve some important information related to Orochimaru's experiments, and this encounter is an unexpected turn. As Orochimaru coils around her, she uses her medical ninjutsu knowledge to try and find a weak point in his snake form.
One plot idea could be that Orochimaru, in his snake form, coils around Sakura while she's on a mission alone. She manages to use her medical ninjutsu skills to fend him off. Another could be a scenario where Orochimaru is actually protecting Sakura from other threats while coiling around her in a strange, yet protective way. Maybe there's a curse on Sakura and Orochimaru's coiling is the only way to suppress it for a while.
The plot could involve Orochimaru using his snake form to trap Sakura as part of a test. He wants to see how she will react under pressure. Sakura, being resourceful, uses her surroundings to her advantage. She might break a nearby branch and use it as a weapon against the snake form. This could lead to a series of exchanges where Orochimaru is impressed by Sakura's tenacity and starts to have second thoughts about his initial intentions towards her.
Sakura could react with fear at first. After all, Orochimaru is a very dangerous and unpredictable character. But then she might gather her courage and try to use her strength to break free. She could use her punches, which are quite powerful, to hit Orochimaru's snake body.
In some Orochimaru lemon fanfic, he might be portrayed as having a more seductive or alluring side. However, this is a very unorthodox view compared to his original character in the Naruto series. His intelligence and cunning nature might still be emphasized, but in a more sexually charged context which is not really in line with the official Naruto story.
In some fanfictions, Orochimaru might develop a sense of loyalty towards Naruto. After being around Naruto for a while, he could see Naruto as someone worthy of his loyalty. This could lead to him being more open to working with the Hidden Leaf and helping Naruto in his various missions. He might even sacrifice his own interests to protect Naruto at times, which is a complete turnaround from his initial character.
Well, in some fanfictions, Orochimaru might use some forbidden jutsu. He could have combined his knowledge of resurrection techniques with some unique chakra sources. Maybe he found a way to reverse the death process by using the power of the snakes he has a connection with. For example, he could have used the regenerative abilities of the snakes' chakra to bring Naruto back to life.
In some fanfics, Naruto might use his new and powerful jutsu that he has mastered over time. Maybe he combines his Sage Mode with the power of the Nine - Tails in a unique way that Orochimaru can't counter. For example, he could use the Nine - Tails' chakra to enhance the range and power of his Sage Mode attacks, and then catch Orochimaru off - guard.
Well, in some versions, Naruto might use his new and improved Rasengan techniques. He could have combined it with his Sage Mode powers to overpower Orochimaru. Maybe he also uses his quick thinking and the element of surprise, since Orochimaru is always so full of his own schemes.
One possible reason could be Naruto's unique power. Naruto has the Nine - Tails within him, which is an extremely powerful and mysterious force. Orochimaru, being a character always interested in power and forbidden jutsu, might be obsessed with Naruto in fanfiction because he wants to study or even obtain that power for himself. Also, Naruto's strong - willed personality and his ability to change the people around him could be fascinating to Orochimaru who has always been somewhat of an outcast in the Naruto world.