He might meet the future versions of Naruto and Sakura. Their relationship with him could be very different in the future, perhaps they are now leaders of the village and Sasuke has to adjust to their new status.
One common theme is Sasuke's struggle to admit his feelings. When he's jealous, it shows that he actually cares more about Sakura than he lets on. Another theme could be misunderstandings. He might misinterpret Sakura's interactions with others as something more than friendship.
In these fanfictions, Sasuke often becomes more responsible. He was once a brooding and solitary ninja, but as a baby daddy, he has to think about someone other than himself. For example, he might start to plan for the baby's future, which is a big change from his usually self - centered ways.
Sasuke's character often develops in terms of his loyalty. By saving Naruto, he shows that his loyalty to their friendship is growing stronger. He may start to question his previous lone - wolf attitude.
In some fanfictions, there are scenes where Sakura is in danger and Sasuke realizes just how much she means to him. For example, if Sakura is injured while protecting Sasuke, Sasuke's reaction of guilt and his newfound determination to always be by her side can be an extremely emotional part of the story.
One possible reason could be that he overestimated his abilities during a battle in the Wave arc. Maybe he took on an enemy that was much stronger than he thought and got fatally injured. Another reason could be that he sacrificed himself to save Naruto or someone else. It's also possible that there was some sort of betrayal within the group they were with, and Sasuke was caught off - guard and killed.
The relationship often becomes more strained. Sasuke's punishment can make Sakura feel resentful at first. But over time, it can also lead to her becoming more independent as she tries to prove herself to him.
Many fanfictions show Sasuke's sadness through his flashbacks. He constantly relives the day his clan was massacred, and these memories haunt him. Writers often use these flashbacks to highlight his internal pain, which affects his relationship with Sakura as he sometimes pushes her away because of it.
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