If Sasuke tries to steal from Naruto in fanfiction, it would be a very interesting plot twist. Maybe Sasuke is being forced to do so by some external power, or perhaps he has his own reasons related to his past or his thirst for power. Naruto would likely be shocked at first, but then he would try to understand Sasuke's motives. However, he wouldn't let Sasuke get away with it easily. Their friends, like Sakura and Kakashi, might also play important roles in this situation, either trying to mediate or choosing sides.
In fanfiction, if Sasuke tries to steal from Naruto, it could lead to a major conflict. Naruto might be deeply hurt, considering they are friends (or frenemies depending on the plot stage). This could trigger a chase or a battle between them, and other characters might get involved to either stop Sasuke or take sides.
Well, it depends on what Sasuke is trying to steal. If it's something like a powerful jutsu scroll, Naruto would surely fight to keep it. Naruto is very protective of his things, especially those related to his growth as a ninja. Sasuke, on the other hand, might be doing it for his own motives, like to gain power faster. This would create a rift in their relationship and set off a chain of events that could change the whole fanfiction story.
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