One possible reason could be that some fans might want to explore different character dynamics. In many fanfics, Sakura is often paired with Sasuke. But if the story focuses on Sakura avoiding Sasuke, it could be to break the typical mold. Maybe the writer wants to show Sakura's independence and growth outside of her relationship with Sasuke. For example, she could be on a journey of self - discovery and Sasuke represents a past she wants to move away from.
It could also be due to a change in Sakura's character perception. If the fanfic writer views Sakura as a stronger character than she is often portrayed in relation to Sasuke, avoiding him could be a way to assert her strength. She might see Sasuke as a distraction from her goals, like becoming a better medical ninja or achieving a higher level of combat skills.
Well, one reason could be that in the original Naruto series, Sakura has a complex relationship with Sasuke. In fanfiction, especially 'lemon' ones which often involve adult or inappropriate content, Sakura might be written to avoid Sasuke to stay true to her character's original sense of propriety. She was always more focused on Sasuke's well - being in a non - sexual way in the official story.
One possible reason could be that Naruto has his own goals and missions that he is so focused on that he tries to avoid distractions, and Sakura might be seen as a distraction in some sense. For example, he is always aiming to become Hokage and improve his ninja skills, and any personal relationship drama could get in the way of that.
Well, it can create a lot of tension. If Sasuke is used to Sakura being around or having certain feelings for him, her avoidance can make him question things. This can drive the plot as he might try to figure out why she's acting this way.
One reason could be to create shock value. By having two main characters kill another important character, it grabs the reader's attention. Another could be to explore a very dark and alternate version of the Naruto universe. Maybe the writer wants to show how far characters could be pushed in extreme situations.
It could be because of a dark power corrupting Sasuke. Maybe an ancient evil force takes over him and makes him see Sakura as an enemy. In some fanfics, this kind of external influence can completely change a character's actions. Also, it might be related to Sasuke's pursuit of power. If he believes Sakura is standing in the way of his ultimate power - seeking goal, he could be driven to kill her.
One possible reason could be Sasuke's focus on his revenge. His thirst for vengeance against Itachi might make him blind to Sakura's feelings and neglect her as he is constantly preoccupied with getting stronger to achieve his goal of revenge.
Maybe to explore different character arcs. The writer might want to see how Sakura would develop as a character if she strayed from her loyalty to Sasuke. It could also be a way to introduce new characters or relationships into the Naruto fanfic world.
In a fanfic, Sasuke's association with dangerous elements might make Sakura scared. For instance, if he teams up with a group of rogue ninjas. Also, his emotional state could play a role. If he is consumed by revenge and his anger is constantly boiling over, Sakura, who cares about him, might be scared of his self - destructive tendencies. Additionally, if Sasuke were to develop some sort of mind - control ability that he struggles to control, Sakura would surely be frightened.
Maybe in the fanfic, Sasuke has done something to betray Sakura's trust. For example, he might have left the village again without considering her feelings.
One possible reason could be that Sakura has finally grown tired of Sasuke's aloof and cold behavior towards her. She might have realized that she has been constantly chasing after him while getting little in return, so she decides to ignore him as a form of self - preservation.