Well, perhaps the plot twist is that it's all a dream sequence. Harry has been under a lot of stress with the whole Voldemort situation and his mind creates this strange scenario in Potions class. Or, it could be that Blaise has a twin who is actually a good guy and Harry mistakes him for Blaise in the heat of the moment and kisses him, leading to a whole lot of confusion and hilarity.
The plot twist might be related to a love potion. Snape could be suspecting that someone is using love potions in his class. Harry's kiss with Blaise could be a result of an accidental ingestion of a love potion. However, as the story progresses, they find out that they actually have real feelings for each other that were hidden beneath the surface all along. This would create a lot of drama as they deal with their new - found feelings in the midst of the wizarding world's chaos.
Some students might be shocked. For example, Ron would probably be open - mouthed in disbelief. Hermione might be initially scandalized but then try to analyze the situation rationally. The Slytherins could have a mix of reactions. Some might be disgusted as they don't expect Blaise to be involved with Harry. Others might see it as an opportunity to tease Blaise or get some leverage over Harry.
One possible plot twist could be that Blaise Zabini's family secrets come to light during their relationship. Maybe there are dark family alliances or hidden magical artifacts in his family's history that impact their marriage. For example, an old family curse that starts to affect Harry.
One interesting plot twist could be when a potion that was meant to be a simple healing draught accidentally turns into a truth - revealing potion. This might lead to characters revealing secrets they never intended to. Another could be a potion that causes temporary magical ability swaps among the characters, like Blaise and another student, which would create a lot of chaos and new interactions.
Well, one interesting aspect is exploring Blaise's family background. Since his mother was a famous beauty and a bit of an enigma, fanfics often expand on this. For example, some might show how Blaise is influenced by his family's reputation in the wizarding society.
Maybe Chiwetel Ejiofor. He has shown in his previous roles that he can play complex characters with a lot of emotional range. For this role, he could bring out the more ambiguous nature of Blaise Zabini's dad, whether he's a good guy or a bad guy or something in between.
Their relationship might start with an unexpected encounter. Maybe at a Hogwarts reunion, they realize they have more in common than they thought. They could bond over their shared experiences of growing up in the wizarding world, with Blaise's pure - blood background and Harry's unique status as the Boy Who Lived.
There are many great Blaise Zabini fanfics in the Harry Potter fandom. Some focus on his friendship with other Slytherins, like how he might interact with Draco Malfoy in a more in - depth way outside of the books. Others might explore his family background and how it shapes his character. For example, a fanfic could delve into how being from an old pure - blood family affects his views on the wizarding world's social hierarchy.
Often, they explore the contrast between Harry's more well - known and heroic persona and Blaise's rather mysterious and slytherin - like nature. Their relationship in these fanfictions is usually about finding common ground.
One possible plot twist could be that the betrothal was a setup by a dark wizard to gain control over Harry. Maybe they thought by tying him to a Slytherin like Blaise, they could manipulate Harry more easily.
One great Harry Potter Blaise Zabini fanfic is 'The Zabini Chronicles'. It delves deep into Blaise's backstory and his relationships within Hogwarts. It gives a really interesting take on his character.