Perhaps there's a dark magic artifact that Hermione has discovered. Draco and Zabini, fearing she'll expose it or use it against them (even though she has no such intention), kidnap her. As time passes, they all find themselves in a race against time to either destroy or protect the artifact, depending on its true nature.
One idea could be that Draco and Zabini kidnap Hermione for some sort of political gain in the wizarding world. Maybe they think her knowledge or influence can be used to their advantage. For example, they could be part of a group that wants to change the power structure at Hogwarts and believe Hermione holds the key to making it happen.
Another plot could be that they misinterpret Hermione's actions as a threat to their families. So, in a rather extreme move, they kidnap her. However, as they keep her captive, they start to realize that she's not the enemy they thought she was. This could lead to a complex relationship dynamic where they have to decide what to do with her.
For Hermione, her character would be fighting against this unjust situation. She would be using her wits to try and escape. Meanwhile, Draco and Zabini may start to have second thoughts as they see Hermione's strength and determination. Maybe Draco's motivation changes from self - interest to a more complex mix of respect and fear for Hermione.
The plot could take a turn where Zabini is initially seen as the bad guy because of the kidnapping, but in reality, he is trying to protect Hermione from a greater threat. Maybe there's a prophecy that involves Hermione and Zabini, and the kidnappers are trying to stop the prophecy from coming true. Another possible twist is that Hermione's kidnapping leads to a discovery of a long - lost magic that Zabini's family has been searching for. This magic could change the balance of power in the wizarding world, and now Hermione is in the middle of it all.
At first, Hermione would be shocked. But then, she would quickly compose herself. She could play along with Draco and Blaise for a while, pretending to be compliant while she actually gathers information about their motives and the place where they are holding her. She might also try to turn them against each other by highlighting their differences in goals or personalities. Given her intelligence, she would surely come up with a clever plan to get out of the situation.
A common plot twist is that Hermione actually has a hidden power or ability that she reveals during her captivity. For example, she might be able to use a type of magic that Draco and his associates didn't expect, which gives her an upper hand in the situation. This could lead to a change in their relationship dynamic, from captor - captive to something more like equals.
One idea could be that Scabior kidnaps Hermione to use her knowledge for some dark wizard's plan. Maybe he's been promised a great reward. Another could be that he mistakes her for someone else at first but then realizes her true value.
Well, a plot might involve a magical artifact. Hermione discovers it first, but Blaise, being possessive, wants to be the only one associated with it through Hermione. So he tries to control her access to it and the research around it. Or perhaps there's a magical competition, and Hermione is the star contestant. Blaise gets possessive, fearing she'll get too close to the other competitors, so he acts as her self - appointed protector throughout the event.
One interesting plot twist could be that Draco saves Hermione not out of pure altruism but because he discovers a dark plot against the wizarding world that Hermione unknowingly holds the key to solving. So, by saving her, he's also saving himself and his family from a greater threat.
A third idea is that Blaise and Hermione are chosen to represent Hogwarts in an inter - magical school competition. They have to train together and overcome their differences. As they face challenges in the competition, they realize their mutual respect and admiration for each other's skills, which gradually turns into a romantic relationship.
One possible plot twist could be that Draco actually has noble intentions behind the kidnapping. Maybe he's trying to protect Hermione from a greater threat that she's unaware of. For example, there could be a dark wizard targeting her specifically, and Draco, despite his past enmity, decides to take matters into his own hands to keep her safe.
Often, a plot twist could be the discovery that the baby is part of some ancient prophecy. This throws Draco and Hermione into a whole new set of challenges as they try to protect their child and fulfill the prophecy. Also, there might be a plot twist where Hermione's Muggle - born status causes problems. Some in the wizarding world might try to use the new baby as a way to target Hermione and her family again, despite her relationship with Draco.