Another possibility is that there's some sort of misunderstanding or magical influence. For example, a spell could have been cast on Ron that makes him act out of character and steal the cloak. He might not even be fully aware of his actions.
Maybe Ron is jealous of Harry and wants to have something that belongs to him for a change. The cloak gives Harry a certain freedom and mystery, and Ron might be longing for that kind of experience.
Harry might be really angry with Ron and it could damage their friendship. They've been through a lot together, and stealing something as important as the cloak is a big betrayal.
There could be a 'Harry punches Ron' fanfic to explore different character interpretations. Maybe the writer wants to show a more impulsive and hot - headed Harry, or a Ron who has done something really wrong that would push Harry to such an extreme. It can also be a way to break away from the typical, harmonious view of their relationship and see how they would deal with such a violent rupture in their friendship.
Another possibility is that in the fanfic's unique plot, there could be some sort of magical influence or dark magic at play. Perhaps a spell was cast on Ron that made him act out of character and punch Harry. It could also be part of a complex plot where Ron is being controlled by an outside force to create drama between him and Harry in the context of the Drarry relationship.
The plot could start with Harry realizing he has deeper feelings for Hermione than just friendship. He might start spending more time with her, which causes tension between him and Ron. Eventually, he could confess his feelings to Hermione, and she might be conflicted because of her relationship with Ron.
There are several possible reasons. It could be due to a misunderstanding about a prophecy or a magical object. For instance, if Ron accidentally breaks a magical heirloom that Harry believes could be important in fighting Voldemort, Harry might be so angry that he ignores Ron. Also, it could be related to Ron's family. If Ron's family does something that Harry disapproves of, like siding with the Ministry when Harry thinks they're wrong, Harry could start ignoring Ron.
The cloak could change his life by making him more confident. If he's able to use it to his advantage, like sneaking into places he normally couldn't, he might gain a sense of power. For example, he could overhear important conversations that give him an edge in his studies or in dealing with bullies at Hogwarts.
Because their friendship is so deep - rooted. They've been through so much together, like facing Voldemort. So, even if Ron makes a mistake, Harry knows the overall value of their bond.
It might be because of a misunderstanding. In some fanfics, a false rumor could spread about Harry. Ron and Hermione, believing it to be true, might decide to distance themselves from him. Say, there's a rumor that Harry is involved with dark magic in some way, and they, being the 'good guys', think they need to stay away.
Yes, there are some out there. Some fanfictions explore this alternative relationship dynamic in interesting ways. They might rewrite the story's events and character interactions to make it seem more plausible for Harry to be with Hermione instead of Ron.
The cloak could make Naruto more confident. If it has special powers, he would feel more capable and in control. For example, if it gives him the power of invisibility, he might start to take more risks in battles and become bolder in his strategies.