She might say she did it for a good reason, like to protect Harry from something.
Hermione could explain that she stole because she was desperate. Maybe she thought that whatever she took from Harry was going to be used in a dangerous way if it stayed with him. Or perhaps she had a premonition of some sort and thought she was acting in his best interests, even if it seemed wrong at the time.
Well, Harry might feel betrayed. He could be really angry at Hermione and it might strain their friendship. He might demand an explanation right away.
She could also try to reason with the Death Eater. Hermione is known for her intelligence and ability to think on her feet. She might try to appeal to any sense of humanity the Death Eater might have, reminding him of the consequences of following Voldemort's evil path.
In many such fanfictions, Hermione might first be in disbelief. Then she could become extremely protective of Harry. She might use her intelligence to find ways to help Harry heal, like researching magic that could soothe his emotional scars. For example, she could look into spells that erase bad memories or ones that promote emotional well - being.
She might become more open - minded. Hermione was always a bit of a know - it - all, but finding out she's a Zabini fan could make her realize there's more to the wizarding world than she thought. She may start to question some of her pre - existing beliefs and be more willing to accept different magical practices, especially those associated with the Zabini family.
Often, Harry will offer her a handkerchief or a tissue if there is one available. He might also put his arm around her in a comforting gesture. In 'The Common Room Crisis' fanfic, he does just that and then stays with her, listening intently as she pours out her feelings. He is patient and understanding, which is in line with his character in the original books. He tries to make her laugh or at least smile by sharing a joke or a funny memory. This shows his deep friendship and care for Hermione.
Another way it could develop is that it could create a rift among their friends. Some friends might support their relationship, while others, like those who have always shipped different pairings, could be against it. This could lead to some interesting plot twists and drama within the fanfiction story.
In such a fanfiction, Hermione might first be shocked to see Harry in that state. She could scold him gently for getting drunk, as she is usually the more level - headed one. Then, she would probably try to sober him up, perhaps using a spell or getting him some water and food.
In some fanfictions, Hermione might find out she is a Malfoy due to a spell gone wrong. For example, a spell that was meant to reveal family lineages got mixed up and suddenly she has a connection to the Malfoy family in the magical world created by the fanfiction writer. It could also be a result of a hidden prophecy that links her to the Malfoys in an unexpected way.
She might be initially defensive. Hermione is a proud and independent character. So, when Snape finds out about her arm, she could be worried that he'll use it against her in some way, like taking away house points or using it as an excuse to give her extra work.
She could be shocked at first. Just imagine, she thought she knew her family all this time, and then bam, she's adopted. She might be angry too, especially if she feels she's been lied to. But also, she could be curious and eager to find out more about her real family.