There could be. Fanfiction allows for a wide range of interpretations and alternate storylines. But it's a really extreme and disturbing concept considering the bonds that Naruto, Sakura, and Sasuke share in the official story. It would be a very different take on the characters, and most fans who love the original story would probably find it hard to accept.
I'm not sure if there is such a specific fanfic. The idea of Naruto killing Sasuke and Sakura goes against the general themes of friendship and redemption in the Naruto series. Most fanfics tend to explore positive relationships and character growth rather than such dark and out - of - character scenarios.
Yes, there are likely some fanfics out there with such a plot. Fanfiction is a creative space where authors explore different scenarios. However, it goes against the general narrative of the Naruto series where Naruto is more about saving Sasuke.
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.
Maybe in a very dark and twisted fanfic, Naruto could be possessed by some evil force. This would override his normal sense of self and his love for his friends, causing him to harm them.
In proper fanfics rather than 'lemon' ones (as 'lemon' implies inappropriate content), Naruto is known for his never - give - up attitude. He's the heart of the story, always trying to bring Sasuke back and protect his friends. Sasuke is a complex character, with his family's past haunting him, which makes him seek power and revenge at times. Sakura, she starts as a girl with a crush but evolves into a capable ninja. These characteristics are often the foundation for fanfic authors to create interesting stories that don't involve improper content.
Yes, there might be some. Some fanfics could have a plot where Sasuke is under a powerful genjutsu or dark influence that makes him turn on Sakura, which would be a unique plot twist.
No. Most Naruto fanfics tend to focus on positive relationships, growth of characters, and adventures within the Naruto universe. A plot where Sakura kills Naruto goes against the general themes of friendship and camaraderie that are central to the Naruto series, so it's not very common.
Well, in a 'sakura kills naruto fanfic', it could be that the writer wants to explore a completely different side of Sakura's character. Perhaps in this fanfic's universe, Sakura has been corrupted or misinformed in some way that leads her to believe Naruto is a threat. It could also be a very edgy attempt at creating a shock - value story within the Naruto fan community.
One possible reason could be a sudden and extreme corruption of Naruto's character. Maybe he is influenced by some dark and powerful force that makes him turn against his friends. Another reason might be a misinterpretation of a prophecy or some kind of mind - control situation.