One common theme could be redemption. Draco might be seeking redemption for his past actions, and Hermione could be the one to either grant it or help him achieve it. Another theme could be forgiveness. They have to forgive each other for all the bad blood between them over the years.
In the fanfiction, there could be a mystery at Hogwarts that brings them back together. For example, a dark magic artifact that was hidden long ago resurfaces. Draco, with his Slytherin knowledge of the castle's secrets, and Hermione, with her vast research skills, team up to solve the mystery. Along the way, they discover new things about each other and themselves, and perhaps even develop some romantic feelings, though it would be a very unexpected and complex relationship given their past.
In a Draco and Hermione reunion fanfiction, they might initially be hesitant. Draco could be ashamed of his past actions during the wizarding war. Hermione, on the other hand, might be curious yet guarded. Maybe they meet in Diagon Alley by chance. Draco could be there to buy some rare potions ingredients for his new business venture. Hermione is browsing the new books at Flourish and Blotts. Their eyes meet, and there's a moment of shock. Draco, trying to be polite, nods. Hermione, after a brief hesitation, nods back. And that could be the start of a series of unexpected interactions.
One idea could be that Ron has become jealous of Hermione's success in the wizarding world. Maybe she has a high - profile job at the Ministry and he feels overshadowed. So, in a fit of insecurity at the Hogwarts reunion, he breaks up with her.
Often, Hermione is shown as the intelligent and determined one. She might be the driving force behind solving a problem that involves Draco and the professors. The professors can be portrayed in different lights. Some fanfictions might show Snape as having a more sympathetic side when dealing with Draco and Hermione's situation. And Draco may be seen as a complex character who is trying to redeem himself in the eyes of the Hogwarts community, which includes the professors.
It could be a new chapter indeed. In the fanfiction, Hermione might be hesitant to see Draco at the school reunion. But when they meet, Draco is surprisingly charming. He compliments Hermione on her achievements, and she starts to see him in a different light. Maybe they share a dance, and it's the start of a very unexpected friendship or more.
The students would likely gossip a great deal. The news would spread like wildfire through the corridors of Hogwarts. Some students might be more open - minded and see it as a chance for a new kind of unity between houses. But many would be judgmental. The Hufflepuffs and Ravenclaws would also have their own views. Hufflepuffs might be more empathetic towards Draco and Hermione, while Ravenclaws might analyze the situation from all angles, trying to figure out how such a thing could have happened in the first place.
Well, in fanfiction, it's often about bending the rules. Maybe it could be some sort of magical accident. For example, a misfired spell that had some unexpected consequences on their relationship and led to this situation.
In a Draco and Hermione meet again fanfiction, they might start off with hostility. Draco, having grown up with certain prejudices, could initially be cold. However, over time, they could discover new sides of each other. Maybe they find themselves on the same side in a new magical crisis, forced to work together. As they do, they begin to respect each other's skills and intelligence. Hermione's vast knowledge and Draco's cunning could combine to solve the problem at hand. Eventually, this could lead to a grudging friendship or even something more, as they see past their old Hogwarts rivalries.
Well, in fanfiction, at Hermione's school reunion, Draco could show up completely changed. Maybe he's now a more humble and kind person. He might approach Hermione to make amends for their past rivalries at Hogwarts. They could end up having a civilized conversation and even discover they have more in common than they thought, like their love for magic research.