The Slytherin students would have mixed reactions. Some of Draco's closer friends might support his new relationship with Blaise, seeing it as a way for Draco to break free from his previous relationship with Harry, which they might not have approved of in the first place. However, there could be some Slytherins who think that Draco's actions are dishonorable, especially if they have a sense of loyalty to the concept of a relationship. As for the teachers, Dumbledore would likely be disappointed in Draco, seeing the negative impact his actions are having on the school's harmony. Snape, being Draco's head of house, might be torn between his loyalty to Draco and his own sense of propriety.
Hermione would probably be really angry. She's Harry's best friend, and she would see Draco's actions as completely unacceptable. She might confront Draco and give him a piece of her mind. Ron, on the other hand, would be more impulsive. He could try to start a fight with Draco right away. Ginny might be more sympathetic towards Harry, trying to comfort him and encourage him to move on.
Harry would likely be very protective of Hermione. He's her best friend, after all. He might confront Draco immediately and try to get Hermione to see that she doesn't deserve this. Ron would probably be angry too, and might even be more impulsive in his reaction, perhaps getting into a fight with Draco.
One common theme is identity. Figuring out what it means to be a Veela while also being themselves in the wizarding world. Another is relationships, like how their Veela nature affects their friendships or potential romances.
Harry would probably be furious. He's always been protective of Hermione, and he'd see Draco's actions as completely unacceptable. Ron might be a bit more vocal about it, perhaps even getting into a fight with Draco. Ginny, on the other hand, would likely comfort Hermione and be very supportive. Neville could be shocked and disappointed in Draco, as he's a character who values loyalty.
A common plot element is them facing a common enemy. For example, a new dark wizard or a group of dark forces in the wizarding world. They have to put aside their differences and work together to defeat this threat.
In these fanfictions, a very unique aspect is the way magic and wolf nature combine. Since they are in the Harry Potter universe, their wolf forms still have to interact with magic. So, they might use magic in ways that normal wolves couldn't. For example, they could use spells while in wolf form. Also, the cultural ideas around wolves in the wizarding world could be different from the Muggle world. Their status as wolves might be seen as something more mystical or powerful, which changes how others in the wizarding world view and interact with them.
Yes, there are quite a few. You can check out fanfiction platforms like Archive of Our Own. Some of these fanfictions explore interesting relationships between the characters with the Veela aspect adding a unique twist to their personalities and interactions.
One common theme is friendship. Many fanfictions explore how these three characters, who start off with a lot of animosity, especially Harry and Draco, can form a friendship. Another theme is rivalry turned into cooperation.
One common theme is redemption. Often, Draco is shown on a path of redeeming himself and his relationship with Harry and Blaise plays a part in that journey. Another theme is friendship. They start from being enemies or at least indifferent to each other and develop a deep friendship over time.
As for the teachers, Dumbledore would be calm and try to understand the situation. He might see it as an opportunity for Harry to learn something new about himself and magic. Snape, on the other hand, might be sarcastic and critical, blaming Harry for getting into such a situation, but secretly he might also be intrigued by the magic used.
Well, in some fanfictions, it might start with Draco feeling a newfound attraction to Blaise while still being in a relationship (in the fanfic world) with Harry. It could be due to a misunderstanding between Draco and Harry, like an argument over something trivial that makes Draco seek comfort in Blaise. Then, as the story unfolds, there would be a lot of drama. Harry might find out in a really heart - breaking way, like seeing them together accidentally. And then there could be a big fight between Harry and Draco, with Blaise caught in the middle, not really sure what he's gotten himself into.