Another way to develop their relationship is by having them face a conflict within the vampire community. Maybe there is a new rule that they both disagree with. Standing up together against this rule would strengthen their bond. Senri could be the more hesitant one at first, but Rima's determination could inspire him, and they would grow closer as they fight for what they believe in.
Perhaps they fall in love in a fanfiction. Senri could be the one to break through Rima's cold exterior. They could have a story where they are forced to hide their relationship from the rest of the vampire community because of some old - fashioned rules. In this story, they would have to find ways to be together in secret, which would add a lot of drama and tension.
One interesting plot idea could be that Rima and Senri go on a secret mission for the vampire council. They have to face a group of rogue vampires who are threatening the peace between vampires and humans. Along the way, they discover a long - hidden power within themselves that helps them in the fight.
A plot could be that Senri and Rima get separated from their vampire group during a battle with a rival group. They have to rely on each other to survive in the wild and find their way back. This would force them to communicate and understand each other better.
They could start by sharing secrets. For example, Takuma could tell Yuki about his past experiences that he hasn't shared with anyone else. This would create a deeper bond between them. Then, they could have some common goals, like protecting the school from a new threat. Working towards this goal would make them rely on each other more and strengthen their relationship.
To develop their relationship, the fanfiction could start with small gestures. Maybe Aido gives Yuki a special flower that only grows in the vampire territory. Yuki is initially confused but intrigued. Then, they could be involved in a project together, like renovating an old vampire mansion. During this process, they get to know each other better, share their hopes and fears, and slowly fall in love.
They could be paired up for a school project in the Vampire Knight world. Senri, who isn't very talkative, and Takuma, who is more outgoing, would have to find a way to work together effectively. This could lead to some comical situations as Senri tries to keep up with Takuma's enthusiasm.
One possible fanfiction could be about Senri and Takuma going on a secret adventure in the Vampire Knight world. Maybe they discover a hidden part of the school that holds a powerful vampire relic. They have to work together to keep it safe from those who would use it for evil purposes.
In a fanfiction, Rima and Shiki could start as rivals. Rima might see Shiki as a threat to her position among the vampires. But then, they get paired up for a task that requires them to work together. As they spend time together, they start to understand each other better. Shiki realizes that Rima is not as cold as she seems, and Rima sees that Shiki has a kind heart beneath his tough exterior.
The relationship can be developed through acts of self - sacrifice. If the knight is willing to risk his life for the princess, it shows his deep devotion. Similarly, if the princess is willing to give up her privileges to be with the knight, it shows the strength of her feelings. This mutual sacrifice can make their relationship more profound and believable in fanfiction.
A story could be about Rima and Shiki exploring an ancient vampire tomb. There, they find clues about their vampire lineage that they didn't know before. This discovery could change their relationship as they realize they are more connected than they thought.