The half a galleon could be part of a magical spell or charm. Harry and Draco might be unknowingly affected by it. They start having dreams about the half a galleon and each other. This makes them curious and they start to seek each other out to figure out what's going on.
Maybe there's a secret society at Hogwarts that uses half a galleon as a membership token. Harry and Draco both get invited, or they find out about it separately. They have to work together within this society and the shared experience of dealing with the half a galleon related tasks and rules brings them closer. For example, they might have to solve puzzles where the half a galleon is a key element.
It could be that half a galleon is a currency for an underground magical market at Hogwarts. Harry and Draco both end up there for different reasons. They both need to use half a galleon to buy something important. This shared economic situation forces them to interact. As they haggle with the vendors and try to figure out how to use their half a galleon, they start to bond over their shared experiences in this strange market.
One possible fanfiction could be where Harry bets Draco half a galleon on the outcome of a Quidditch match. Maybe it's Gryffindor against Slytherin and Harry is so confident in his team's skills that he makes this bet with Draco, who is equally sure of Slytherin's victory. This could lead to a lot of banter between them before the match and some interesting consequences depending on who wins.
In a fanfiction, Harry could bet Draco half a galleon that he can make Hagrid laugh within five minutes. Draco doesn't think Harry can do it as Hagrid is often a bit gruff. But Harry tells Hagrid a really funny story about his first encounter with a magical beast in the Forbidden Forest. Hagrid bursts out laughing, and Draco has to hand over the half - galleon. This could lead to Draco being more interested in Harry's adventures and maybe even wanting to be part of them in some way.
The fanfiction could revolve around a magical item that costs half a galleon that both Harry and Draco want. They end up in a race to obtain it. But as they compete, they start to understand each other's motives better. Draco might be trying to prove himself to his family, while Harry is just trying to protect Hogwarts. This shared understanding could lead to a new relationship between them.
In such a fanfic concept, Draco can be seen in a more dominant role compared to his usual portrayal. This challenges the traditional view of Draco as a more subservient or secondary character. For Harry, it shows his ability to be in a more submissive position, which is a contrast to his heroic, leading - role nature in the original series. It allows for a new exploration of their personalities and how they interact when the power dynamic is shifted.
It changes it a great deal. They go from being bitter enemies to having a much more complex relationship. There's an immediate connection that they can't ignore.
Fanfiction often explores it by delving into Harry's psyche. It might show how Harry's past interactions with Draco have led to this fear. For example, Draco's constant taunting and his family's connection to the Dark Arts could be factors.
In these fanfictions, their relationship often becomes more positive. Instead of being rivals, they become supportive brothers. For example, they might help each other with schoolwork or protect each other from danger.
Draco starts to become more empathetic. Usually seen as a bit of a cold character, taking care of Harry forces him to understand the feelings of others on a deeper level.
In the fanfiction, their friendship could develop gradually. At first, they might be forced to work together on a school project. Draco, who is used to being in control, might be frustrated by Harry's different approach, but as they work through the problems, they start to respect each other's skills. This mutual respect then grows into a tentative friendship as they continue to interact more in school and outside of it. They might also find common interests in things like magical creatures that they initially thought only they were interested in.
In terms of relationships, if Harry Potter is half angel half devil in fanfiction, it could have a huge impact. His romantic relationships would be complex. A girl like Ginny might be both attracted to his angelic qualities of protection and kindness, but also a bit intimidated by his devilish side. His friendships could also be strained. His more angelic actions might make some friends rely on him too much, while his devil - like moments could make others question his loyalty. For example, if he uses his devilish powers in a moment of anger against a friend's enemy, his friend might wonder if he's going too far. Overall, his relationships would be in a state of flux due to this dual nature.