One idea could be that Viktor Krum, still having feelings for Hermione, comes back to Hogwarts for a Quidditch event. Harry notices his lingering glances at Hermione. This causes some tension between Harry and Krum as Harry is very protective of his friend. Meanwhile, Hermione is caught in the middle, trying to focus on her studies but also dealing with the unspoken emotions.
A plot could involve a magical mystery where Hermione, Harry, and Krum have to team up. Maybe there's a dark magic item that has been hidden in Bulgaria (Krum's home) and it has some connection to Hogwarts. As they search for it, Krum and Hermione start to rekindle their old feelings, much to Harry's surprise. Harry, on the other hand, is more worried about the potential danger of the dark magic item.
One plot idea could be that they discover their brotherhood through a magical accident. Maybe a spell goes wrong during a Quidditch match and reveals their hidden family connection. They then have to navigate the wizarding world together, facing both admiration and envy from others.
One plot idea is that there is a magical exchange program between Hogwarts and Durmstrang, and Viktor Krum is part of it. He and Harry Potter become roommates, and they have to deal with cultural differences. For example, Durmstrang might have different rules about magic use at night compared to Hogwarts.
One idea could be a story where Hermione and Viktor meet again years after the Triwizard Tournament. Maybe Viktor has come to Hogwarts as a guest lecturer and he and Hermione rekindle their friendship, which then develops into a deeper relationship as they work together on a research project about magical creatures that are native to both Bulgaria and Britain.
Another storyline could involve a magical mystery. Suppose there's a dark magic object that has ties to both Bulgaria and Britain. Harry and Viktor have to team up to figure out what it is and how to stop it from causing chaos. They might face challenges from both wizarding communities as they try to solve the mystery.
One interesting fanfiction could be where Harry and Viktor team up to solve a mystery in the wizarding world that involves both their schools. They use their unique skills, Harry's quick thinking and Viktor's athletic abilities, to overcome various obstacles.
Well, their relationships can develop in many ways. For example, Viktor Krum might start by sending Hermione letters from Bulgaria. At first, Hermione might be hesitant to respond, but as time goes on, she starts to write back. Harry could be a bit jealous at first, thinking Krum is trying to steal his friend. But as he sees how happy Hermione is, he starts to accept it. Then, when they meet again in person, the feelings between Hermione and Krum become more intense.
One interesting plot idea could be that Krum returns to Hogwarts for a Quidditch tournament. Hermione is now a teacher's assistant, and they rekindle their old feelings while discussing the strategies of the game. They face some opposition from students who don't understand their relationship, but they work through it together.
One great fanfiction could be about Viktor Krum visiting Hogwarts again after the Triwizard Tournament. Maybe he comes to teach a special Quidditch training session for the students. In this fanfic, he could interact with Harry Potter and other characters in a new and exciting way, sharing more about his own school, Durmstrang.
One idea could be that they face challenges from their different magical cultures. For example, Hermione's friends from Hogwarts might be initially skeptical of Viktor due to his Durmstrang background. Another could be that they discover new magic related to pregnancy that has been long forgotten. Maybe they find a spell that can communicate with the unborn child's magic even before it's born.
One plotline could be about a magical mystery that only the three of them can solve together. Maybe something related to an ancient Triwizard Tournament secret that was never fully revealed. They have to put aside their differences and use their unique skills to figure it out.