A popular trope could be the 'forbidden love' aspect. Since Hermione is from a different side (the more 'good - natured' side in the original story) and Draco is from the Malfoy family, there could be stories of forbidden relationships within the family tree. It could be that Hermione's family had some sort of relationship with the Malfoys that was frowned upon in the wizarding society, but it led to the connection between her and Draco in this fanfiction - created family relationship.
One possibility could be through some sort of time - traveling or alternate universe scenario in the fanfiction. Maybe a spell gone wrong sent Hermione back in time and through a series of complex events, she ended up in a situation where she was related to Draco in that way. It's a very creative and out - of - the - box concept that fanfiction often explores.
She could stand up to him. Hermione is known for her intelligence and quick - wittedness. So she might use her sharp tongue and logical arguments to put Draco in his place. For example, she could expose his wrongdoings or the flaws in his pure - blood ideology.
In many fanfictions, Draco Jr. is often depicted as a complex character. He might inherit traits from both Draco and Hermione. For example, he could have Draco's cunning combined with Hermione's intelligence. Some fanfictions show him struggling with the legacy of his parents' past enmity at Hogwarts. He may face challenges in making friends or finding his place in the wizarding world due to the unique nature of his parents' relationship.
Draco might start to show his more caring side. For example, he could become very protective of Hermione during her pregnancy, which is a big change from his former Slytherin coldness.
A great idea could be a time - travel fanfiction. Hermione accidentally travels back in time to Draco's childhood. She has to blend in, so she borrows some of his clothes. Draco, as a child, is curious about this strange girl in his clothes. This interaction could change the course of their future relationship in the original timeline.
One popular theme could be the idea of redemption for Draco. In many fanfictions, he is shown to overcome his family's dark past and prejudice. Another theme might be the power of friendship or love that develops between Hermione and Draco, despite their initial differences. It could also explore how they navigate the complex wizarding world together, facing challenges from their respective houses and the general wizarding society.
Hermione's character might develop by becoming more open - minded. Initially, she sees Draco as just a Slytherin bully. But as the story in the fanfiction unfolds, she starts to see the deeper layers of his personality. She might learn to look beyond the house stereotypes. For Draco, he could become less arrogant. His interactions with Hermione, who is so strong - willed, make him question his own values. Maybe he starts to show more kindness and understanding.
Hermione's personality might become more open - minded. Initially, she has a very fixed view of Draco as a bully. But with the marriage contract, she has to see him in a different light. She might become more empathetic towards him. For Draco, he could become less arrogant. The forced proximity with Hermione makes him realize that his pure - blood supremacist views are not as valid as he thought. He starts to respect Hermione's Muggle - born status and even learn from her in some ways.
In a fanfiction with this theme, it could be set post - war. Draco and Hermione find themselves in a situation where they are on the run from some dark wizards who are after them for different reasons. During their escape, Hermione gets wet and cold. Draco, having a change of heart after the war, gives her his warm cloak. This act of kindness begins to break down the barriers between them, and they start to have deeper conversations, realizing they have more in common than they thought.