It could also be related to some sort of family or pure - blood related matter. Draco's family might have some connection to Hermione that he has just discovered, and he's trying to keep her in place to sort out the implications of this connection, which might involve protecting her from other dark forces or just making sure she doesn't interfere with his family's plans.
One possible reason could be that Ron has deep - seated feelings for Hermione that he's not fully aware of yet. In the story, he might be subconsciously drawn to her and thus won't leave her alone.
Maybe there's some sort of plot or secret that he doesn't want Hermione to expose. He might think that by keeping her close, he can prevent her from telling others. For example, if he's involved in some sort of illegal or unethical magic practice and he believes Hermione has figured it out.
It's also possible that other characters would get involved. Harry and Ron, being Hermione's closest friends, would surely notice her absence. They could come to her rescue. There might be an epic battle of magic between them and Draco, or they could try to reason with Draco, appealing to his better nature if he has one.
She could also start to negotiate with Draco. Given her intelligence, Hermione might try to understand Draco's motives and then use reason to persuade him to let her go. She might offer alternatives or compromises that would satisfy both of their needs.
One possible reason could be his Slytherin pride and the long - standing rivalry between Gryffindor and Slytherin. He might have said something mean to Hermione in the heat of that rivalry. Another reason could be jealousy. Maybe Hermione is achieving more academically or getting more recognition, and Draco, being a proud pure - blood, can't stand it.
Well, perhaps the werewolf is attracted to Hermione for some special reason. Maybe it's her magical power or her kind heart. In the fanfiction, it could lead to a series of dangerous situations for Hermione, like she has to constantly be on guard against the werewolf's unexpected approaches.
One possible reason could be a feeling of betrayal. Maybe he found out some long - hidden family secrets that made him lose trust in his family. For example, if he discovered that his parents had made a deal with some dark force in the past that had negative consequences for him or the village.
One possible reason could be that he has faced a lot of misunderstandings within the family. Maybe his family has certain expectations that he can't meet, and over time, this has led to his coldness. For example, if his family doesn't understand his dreams or ambitions, Naruto might feel alienated.
There's also a chance that it's a werewolf from another wizarding community that has come to Hogwarts and has fixated on Hermione. This werewolf could be on a mission, perhaps sent by a dark wizard, and Hermione just happens to be in his path, and he won't leave her alone as part of his orders.
In the fanfiction, it could be related to family values. Draco comes from a family with certain beliefs about blood purity. Hermione being a Muggle - born might be seen as beneath him by his family's standards. So, Draco might abuse Hermione as a way to show his superiority based on those wrong family - instilled ideas.