Another plotline could be a prequel - type story. It could delve into their pasts, showing how they grew up and how their paths were set to cross. This could include details about their families, their early training or education, and the events that shaped them into the characters we know in the Black Butler series. It might also show how their relationship started to develop from a young age.
A friendship - based plotline is also likely. It could explore how they met and became friends, perhaps showing their different personalities and how they complement each other. For example, Vincent's charm and Diederich's more reserved nature could create an interesting dynamic as they interact in various social situations.
One possible plotline could be a mystery adventure. Maybe they team up to solve a strange case in the Victorian era setting of the Black Butler universe. They could use their unique skills and knowledge to uncover secrets.
You can try searching on popular fanfiction websites like Archive of Our Own (AO3). There are often many works related to different fandoms there. Just use the search function and type in 'Vincent Phantomhive x Diederich' and it should show you the relevant fanfictions.
One possible plotline could be that Vincent, with his dark past and combat skills, gets involved in Negi's magical world. Maybe he helps Negi in a battle against a powerful dark magic user.
One possible plotline could be a romantic adventure where Will and Cornelia go on a quest together. They might face various challenges that test their relationship and their individual strengths.
One possible plotline could be that Ciel is injured during a mission against a powerful enemy. His servants then have to protect him while also trying to find a way to heal his wounds. Another could be that he's injured by a betrayal within his own ranks, leading to a story of trust and revenge. Maybe he's injured in an accident that makes him re - evaluate his life and his goals in the underworld.
In some fanfiction, it could be that making love is a way for them to heal each other's emotional wounds. Vincent, with his complex past, might find solace in Catherine's love. Catherine, on the other hand, could feel more complete. After this, they could decide to be more public about their relationship within their community, which would bring both support and some resistance, but they would face it together because of the new level of connection they have achieved.
Well, it could be a story of discovery. The Everqueen might discover a long - lost secret about Morathi that changes her perception. This could lead to a new relationship dynamic between them. Or it could be a plot about survival. In a world full of danger, they have to rely on each other's skills. Morathi's cunning and the Everqueen's grace could be combined to overcome challenges.
A plotline might involve Pyrrha traveling to the Naruto universe. She could end up at the Ninja Academy and start learning ninja techniques with Naruto. Their different fighting styles would create interesting interactions, and perhaps a romance could develop as they train together.
Maybe in a fanfiction, Tsunami discovers a hidden power within herself while Naruto is in the village. Naruto helps her control this power. As they train together, they start to see each other in a new light. Their relationship evolves from friendship to something more romantic as they face various challenges together.
A plotline could involve the two characters coming from different worlds or backgrounds. The woodman could be from a forest realm where everything is about strength and survival, while the plantman is from a more peaceful, flower - filled land. They meet by chance, and initially, they don't get along because of their differences. But as they are forced to work together to solve a common problem, like a dark force threatening both of their lands, they start to understand and care for each other, and a romantic relationship blossoms between them.
A more romantic plotline could be that they are star - crossed lovers. There could be something that is keeping them apart, like a prophecy or a family feud. The fanfiction could then revolve around them trying to break free from these constraints and be together. They might have to fight against the odds and the opinions of others in the story.