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.
A possible motive could be a creative exploration of the 'what - if' scenarios. Maybe the writer wants to see how the story would unfold if Sasuke completely lost his way. Another motive could be to create a sense of high - stakes drama. Since Sakura is an important character, her death at Sasuke's hands would be a huge shock.
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.
One possible motive could be that Sakura is brainwashed. Maybe an enemy uses some kind of mind - control jutsu on her and she becomes a puppet to kill Sasuke. Another could be extreme jealousy. If she felt that Sasuke was slipping away from her in some way, in a very dark and twisted version of the story, it could lead to her killing him.
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.
It's relatively rare. In the Naruto fandom, Naruto, Sasuke, and Sakura are central characters with complex relationships. Naruto and Sasuke are rivals but also friends, and Sakura is part of their team. Most fanfictions focus on their growth, friendship, or romantic relationships. Killing off two such important characters goes against the general positive and growth - oriented themes that many fans prefer.
Generally, fans have a mixed reaction. A large portion of fans who support the Sasusaku relationship feel betrayed or disgusted by such fanfictions. They feel that the characters have been misrepresented. On the other hand, a small group of fans might view it as a way to explore the limits of the characters and the Naruto universe. But overall, it is a very controversial topic within the Naruto fan community, with more fans leaning towards not accepting this kind of extreme deviation from the original story's character arcs.
Sakura may initially be paralyzed by fear, but then her love for Sasuke and her own determination to survive could kick in. She might try to counter - attack in a non - lethal way, hoping to subdue Sasuke rather than harm him. She could also call out to their shared memories in an attempt to stop him from actually killing her.
Perhaps Sasuke was testing Sakura's loyalty or strength. He may have thought that if she couldn't withstand his aggression, she wasn't worthy of being in his life. Also, his own inner demons, like the hatred he carried from his past, could have flared up and led him to almost kill her without fully realizing what he was doing.
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.