Well, it could be that they have their own motives. Maybe they believe they know better than Harry in certain situations or they're trying to follow some greater plan that involves controlling his actions.
Maybe it's because they think it's for Harry's own good or to protect him from some perceived danger.
One reason could be that they think Harry is too impulsive and they want to guide him. Or perhaps there's a hidden agenda related to the magical world's politics that requires them to keep a tight rein on Harry.
Sometimes, Dumbledore might try to control Harry by manipulating the information he gives him or influencing his decisions without him realizing it.
Harry might initially be confused. He has always looked up to Dumbledore, so when he realizes Dumbledore is trying to control him, he could start to question everything he thought he knew about their relationship. He may become more rebellious as a result, trying to break free from Dumbledore's influence and make his own decisions.
As mentioned before, a powerful dark wizard could be one of the characters. This dark wizard might see Harry as a threat or a tool to achieve his evil plans and thus tries to control him. He would use all kinds of dark magic and cunning strategies to bend Harry to his will.
It could be that Dumbledore has some strategic or protective reasons. Maybe the electives Harry chose initially could expose him to greater risks or prevent him from developing crucial skills needed later on.
One reason could be that Hermione is overly worried about Harry's safety. Since he's always in the middle of dangerous situations, she might think controlling his actions can keep him out of harm's way.
It could be that Dumbledore is afraid of what Harry might do if left to his own devices. Harry has a lot of power, and Dumbledore may worry that he could be swayed by the wrong people or ideas. So, in an attempt to keep Harry on the 'right path', he resorts to trying to control him. But this also shows a lack of faith in Harry's character and judgment.
It could also be that Dumbledore has some secrets that he's afraid Hermione will uncover if she's left to her own devices. Hermione is known for her inquisitive nature. So, to keep these secrets hidden, he attempts to control her. For instance, if there are some hidden aspects of Hogwarts' history or certain faculty members that he doesn't want exposed, he might use control over Hermione to prevent her from delving too deep.
No, it's not common. Usually, fanfiction focuses on positive relationships between characters, especially Harry and the Weasleys who are often portrayed as a close - knit family. So this would be a rather unusual and dark theme.
The relationship becomes more protective. The Weasleys will be more cautious about Harry's well - being.
At first, the Weasleys might try to reach out to Harry. But as he continues to avoid them, they could start to feel rejected. This might lead to some resentment building up, especially among the younger Weasleys who don't understand why Harry is acting this way. For example, Ron might be really frustrated as he considered Harry one of his best friends.