There might be some extremely niche and dark fanfics that involve such a plot, but it's not something that is mainstream or widely promoted. Most fanfics in the Naruto fandom tend to focus on more positive relationships, character development, or alternative storylines that don't involve such tragic and self - harm - related concepts. If it does exist, it would likely be in some less - known or more edgy fanfic communities.
It is highly unethical. Fanfiction often has a wide readership, and depicting a character like Sakura killing herself can be seen as glorifying or normalizing suicide, which is a serious real - world problem. There are many other positive and healthy storylines that could be explored instead.
In the fanfic, Sakura might be talking to herself about Sasuke because she's facing a difficult decision that involves him. For example, if there's a new threat in the ninja world and she has to decide whether to send Sasuke into danger or keep him safe. She could be weighing the pros and cons while muttering to herself, thinking about Sasuke's skills but also his well - being. And her feelings for him are also clouding her judgment, so she's trying to clear her head by talking it out to herself.
I really hope there isn't such a disturbing fanfic. Self - mutilation is a very serious and dark topic, and it doesn't align with the positive aspects of the Naruto series. Most fanfics focus on more positive relationships and storylines between the characters.
Another idea for this fanfic could be that Sakura has lost her mind because of her unrequited love for Sasuke. She might be talking to herself about all the times she tried to get his attention but failed. She could be in her room, surrounded by memories of Sasuke, and saying things like 'Why don't you see me, Sasuke? I'm right here.'
There's a fanfic called 'Melodies of the Heart'. In it, Sakura's humming serves as a form of self - comfort while she's on missions away from Sasuke. As the story progresses, Sasuke realizes how much he misses her humming when she's not around. It's a really sweet and emotional story. There are also some fanfics that explore how Sakura's humming can be a source of healing for Sasuke, especially when he's dealing with his past traumas.
Educating the fanfic community about the importance of positive and healthy storylines could also help. If writers are aware that such content is not acceptable, they may be less likely to create it. Also, moderators of fanfic communities can be more vigilant in screening for such content.
The plot might involve Sakura having a dream about Sasuke leaving her again. When she wakes up, she starts talking to herself. She's trying to convince herself that Sasuke has changed and that he truly loves her now. She might be going through all the events that led to their current relationship and how they overcame their differences. She could also be thinking about how to make their relationship stronger in the future through her self - talk.
In a Sasuke - centered fanfic, Sakura humming to herself could signify her longing for Sasuke. It could be a way for her to express her emotions that she can't put into words. Maybe she hums the tunes that remind her of the time they spent together.
If in a Sasuke fanfic, one possible reason could be unrequited love. If Sakura feels that Sasuke will never return her love and she has exhausted all hope, she might sink into despair. Another reason could be if she feels she has failed Sasuke in some way, like not being able to protect him or help him in his goals. Maybe she blames herself for his continued pain or suffering and sees no way out but to end her own life.