Obviously, Harry and Blaise are the main characters. Harry, the famous Gryffindor hero, and Blaise, a Slytherin student. They are the ones at the center of this accidental marriage situation.
Well, perhaps it could start with some sort of magical mix - up. Maybe a spell gone wrong during a celebration. Harry and Blaise could find themselves suddenly married. Then they'd have to deal with the shock from their friends and family. For example, Hermione might be very confused and Ron could be outright shocked.
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.
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.
He might be suspicious at first. Given their different houses and the general tensions between Slytherin and Gryffindor, Harry would be cautious about Blaise's motives.
One popular 'Blaise and Harry boyfriends fanfic' is 'The Unlikely Bond'. It has a great plot where Blaise and Harry start off as rivals but gradually develop a deep emotional connection. The author does an amazing job of portraying their relationship growth, from hesitant friendship to a loving relationship.
Perhaps it's a warning. There might be some danger approaching Harry, and Blaise, having come across this information, decides to inform him. For example, if there's a new dark wizard in the school or some sort of plot against Harry that Blaise has uncovered.
One common theme is the overcoming of differences. Hermione is from Gryffindor, known for courage, while Blaise is from Slytherin, often associated with cunning. Fanfictions usually explore how they bridge this gap. For example, in many stories, they learn to understand and respect each other's values.
Another theme might be the reaction of the wizarding world to such an unusual situation. It can be about how society views their relationship and the pregnancy, and how Blaise and Harry navigate through the potential prejudices and challenges. In many fanfics, this can lead to some interesting plot developments as they try to protect their family and each other.
There are some. However, the quality can vary greatly. Some might focus more on the relationship development between Harry and Blaise, while others could be more action - packed with their interactions being part of a larger plot. It really depends on what you're looking for in a fanfic.