Well, one possibility is that Naruto's ability to melt the fireball reveals a new and unexpected power within him. This could lead to Kakashi taking a special interest in training Naruto further to explore and control this power.
It's possible that Naruto has unlocked a special bloodline limit. This bloodline limit might give him the power to manipulate elements in a way that can counter and melt the fireball. For example, if it's a water - based bloodline limit, he could use highly concentrated and superheated water to melt the fireball.
Well, it could be about Naruto developing some new jutsu that involves melting substances and he uses it to protect Tenten in a creative way. Maybe during a battle, Naruto's new power creates a sort of protective coating around Tenten, which is made of the melted material. It could also be a story where Naruto accidentally discovers this ability while trying to save Tenten from a dangerous situation.
Well, it could be about Naruto developing a new jutsu that involves melting a special substance and using it to coat Tenten's weapons for added power in battle. Maybe Naruto discovers a unique chakra - based material that he can manipulate in this way, and Tenten is initially skeptical but then sees the great potential in it for her combat style.
Naruto was able to dispel the fireball with a boeken because he had trained hard and had a deep understanding of his powers. He made a split-second decision and executed the move perfectly, surprising everyone.
It could be an action - adventure genre. With Naruto's new power of melting and coating, there would be lots of exciting battles and dangerous situations. They could be on a quest to find a way to control or master this power, facing off against various enemies along the way.
There could be a villain from another village who has heard about Naruto's unique ability to melt and coat. He targets Tenten because she is often seen with Naruto and is the one with the upgraded weapons. This villain has a power that can disrupt the chakra flow in the coating, causing it to malfunction. His goal is to steal the technology behind Naruto's ability and use it to strengthen his own village's military, which would disrupt the balance of power in the ninja world.
Well, one similarity could be their determination. In the fanfic, like in the original series, both Naruto and Kakashi are very determined. Naruto is always striving to become Hokage and Kakashi has his own goals and missions he's dedicated to. They also might share similar combat styles in the fanfic, perhaps Naruto starts to adopt some of Kakashi's strategic thinking during battles.
One funny fanfic could be about Kakashi trying to teach Naruto some new jutsu, but Naruto keeps getting distracted by the local wildlife. For example, he spots a bunny and chases after it, leaving Kakashi exasperated.
Well, considering the popularity of the Naruto series and the creativity of its fans, it's very probable that there is a 'naruto beats kakashi fanfic'. Fans often like to play around with power dynamics and character relationships in fanfics. They might write such a story to show Naruto surpassing his mentor in a battle, which could be an interesting take on the characters' development.