One possible scenario could be that in this fanfiction, Harry discovers that Hermione is being bullied by some dark - minded students at Hogwarts. He steps in immediately, using his skills and the respect he has among his peers to put an end to it. Maybe he threatens the bullies with exposure to the professors if they don't stop.
Well, it could start with Hermione showing signs of distress. Harry notices and starts to investigate. He finds out that there's a group of Slytherins who are using dark magic to mentally abuse Hermione, making her doubt her own abilities. Harry then challenges them to a wizard's duel and wins, forcing them to stop their abuse.
He could use his position of authority. Snape might confront the abuser directly. Since he's a teacher, he has the power to intimidate and put a stop to any immediate harm. He could also give Hermione a safe place to stay, like his own quarters (if it's within the rules of the fanfiction world).
Well, perhaps he uses his influence in the wizarding world. Maybe he has some connections or knowledge that allows him to intervene and get Hermione out of the abusive situation. For example, he could use his status among the pure - blood families to put pressure on the abusers.
One scenario could be that Draco witnesses Hermione being bullied by some Death Eater - sympathizing students. He steps in and uses his quick wit and knowledge of magic to outsmart them. Another could be in a situation where Hermione is being wrongly accused of a crime and is facing abuse in the form of unjust imprisonment. Draco, having some influence in the Ministry due to his family, intervenes and clears her name.
Well, Draco could save Hermione from abuse in fanfiction by first recognizing the signs of her abuse. Then, he might secretly provide her with protective spells or magical items. For example, he could give her a charmed amulet that wards off dark magic and physical harm. He also might use his knowledge of the Dark Arts to counter any curses or hexes that the abusers might use against her.
They might face magical justice. In some fanfictions, the Ministry of Magic could get involved and strip them of their magic, or at least put them under strict surveillance.
Well, in some versions, Minerva might notice Hermione's withdrawn behavior in class. For example, she could see that Hermione is no longer as eager to answer questions or participate as she used to be. This change in her normal enthusiastic self could be a sign that something is wrong at home or in her personal life, leading Minerva to suspect abuse.
Well, in many such fanfictions, Harry might use his magic skills. He could cast a powerful stupefy spell on the troll to stop it in its tracks and then quickly lead Hermione to safety. Maybe he also uses his quick thinking and knowledge of the Hogwarts corridors to find a hiding place where the troll can't reach them.
After Harry saves Hermione, their relationship could evolve in a more complex way. There could be a newfound respect between them. Harry might have a sense of pride in being able to protect her, and Hermione may feel a bit more vulnerable around him. This could lead to some awkwardness at first, but as they work through it, they become closer. They might start spending more time together, not just for school or magic - related things, but also just to be in each other's company. Their friendship could become the cornerstone of their lives, with Harry always being there to protect Hermione and Hermione always being there to support Harry with her knowledge and wisdom.