Sasuke might feel frustrated. His attack was thwarted, and he may see it as a sign of his own weakness compared to Naruto. This could fuel his desire to get stronger even more, leading to him seeking out more intense training or even darker powers.
Naruto has a lot of skills at his disposal. He could potentially summon Gamabunta, the giant toad. Gamabunta could take the hit of the Fire Ball for Ami. Or Naruto might use his shadow clone technique. He could send a bunch of clones towards Sasuke's Fire Ball, and the combined force of the clones could either absorb or redirect the Fire Ball away from Ami.
Ami could potentially be someone with a special ability or connection to Naruto. Maybe she has some knowledge that is important to the village or to Naruto personally. That's why Naruto is so determined to save her from the fire ball. It's also possible that she is related to one of Naruto's friends or mentors, and that's what draws Naruto to her rescue.
One consequence could be a change in the relationship between Naruto and Sasuke. Sasuke might become more enraged or, on the other hand, he could start to question his actions. As for Naruto and Ami, their bond might grow stronger. Ami would likely be very grateful to Naruto, and this could lead to a closer friendship or even something more in the future of the fanfiction.
Well, in most cases, Naruto might use his signature jutsu like the Rasengan. He could either deflect the fire ball with it or use his incredible speed to get to Ami before the fire ball hits her. Maybe he also uses his shadow clones to create a distraction for the attacker while he rescues Ami.
Well, in the fanfiction, Naruto might use his own jutsu, like the Rasengan. He could quickly form it and counter Sasuke's fireball, thus saving Ami. Maybe Naruto's quick reflexes and his determination to protect Ami play a big role here.
One consequence could be that Ami becomes deeply indebted to Naruto. This could lead to a strong friendship or even a romantic relationship depending on the nature of the fanfiction. She might also become a valuable ally to Naruto in future battles or challenges he faces.
One consequence could be that it changes the way his peers view him. If the fanfiction has some unique or unexpected ideas, it might make them see Naruto in a whole new light. Maybe it could even inspire some of them to start writing their own fanfictions. However, there could also be those who are critical and might tease him about it.
Maybe Sasuke is being manipulated by an evil force that wants to get at Naruto through Hinata. Since Hinata is important to Naruto, targeting her would be a way to hurt Naruto.
Perhaps Naruto has some sort of premonition about Sasuke's danger. He follows his gut feeling and finds Sasuke trapped by Haku. He then uses his Uzumaki bloodline power, something that might be enhanced in fanfiction, to disrupt Haku's chakra flow and save Sasuke.
One possible plot is that Naruto uses his ninja skills in a creative way. For example, he could use the Transformation Jutsu to transform into someone the fangirls would be more interested in, like a famous singer or actor in their world. While the fangirls are distracted by this new 'celebrity', Naruto grabs Sasuke and they make their escape. Another aspect could be that Sasuke is initially reluctant to be 'saved' by Naruto because he doesn't want to seem weak. But as the situation gets more out of hand, he realizes he needs Naruto's help. The two then have a heart - to - heart conversation after escaping the fangirls about how Sasuke feels about his new - found 'fame' among the fangirls.