What could be an interesting plot for a 'Black Butler in the Real World' fanfiction?

Another plot could involve a real - world detective who stumbles upon the existence of Ciel and Sebastian. The detective is initially skeptical but as he witnesses their abilities, he becomes involved in their world. This could lead to a series of adventures where the detective has to learn to work with the duo from the Black Butler universe to solve crimes that are somehow related to the dark secrets of the Phantomhive family in the real - world setting.

One idea could be creating a story where a new character arrives at the Phantomhive manor with a special power that Ciel is initially suspicious of but later realizes can be useful in his battles against his enemies. For example, the power to communicate with the dead, which could provide valuable information in their investigations.

Sebastian, being a demon, would have an easier time adapting in some ways. He could use his powers subtly. For instance, his speed could be used to quickly move around in a busy city without being noticed. He'd also be intrigued by modern cuisine and might experiment with new ingredients while still maintaining his high - class cooking standards.

Another aspect could be the characters' relationships with real - world people. Ciel could form an unlikely friendship with a modern - day detective. They would exchange knowledge, with Ciel sharing his insights from solving mysteries in his world and the detective teaching Ciel about modern - day forensics. This could lead to a series of adventures as they work together to solve crimes in the real world.

One possible plot could be that the characters from 'D Gray - Man' are transported to the world of 'Black Butler'. Allen Walker and Sebastian could meet, and there could be a clash of their different moral compasses. Allen, with his mission to destroy Akuma, might initially view Sebastian's demonic nature as something to be eliminated. Meanwhile, Sebastian, who is bound to Ciel, might see Allen as a threat to his master's plans. This would lead to a series of intense battles and power struggles, with the other characters from both series getting involved in unexpected ways.

I think Grell would be really interesting. In the real world, Grell's flamboyant and over - the - top personality would create a lot of chaos. He could be a fashion designer or something similar, still with his love for the color red and his chainsaw. His interactions with Sebastian would be hilarious, as Sebastian would be constantly trying to keep him in line while also dealing with the real - world problems.

One concept could be that Sebastian and Ciel are transported to modern-day London. Sebastian has to adapt to modern technology like smartphones while still serving Ciel. Another idea is that a modern-day detective discovers the existence of the Black Butler world and gets involved in their affairs. And perhaps a fanfiction where Ciel attends a modern school undercover and has to deal with bullies and normal school problems while Sebastian tries to keep his identity a secret.

Well, the plot could involve the cat - Harry Potter - stumbling into the Black Butler world. Maybe he's lost his human form due to some dark magic. He could then encounter Sebastian and Ciel. The cat - Harry - might use his magic in cat form to help or hinder the duo in their investigations. For example, he could use his invisibility ability (in cat form) to spy on enemies.

One possible plot could be that Meyrin discovers she is pregnant and is terrified of Sebastian's reaction. But Sebastian, being the ever - dutiful demon, decides to protect the baby at all costs, leading to some comical and heartwarming moments as he tries to understand human pregnancy and baby - care.

A possible plot could involve the characters from both series swapping their worlds. So, the Fruits Basket characters end up in the Victorian - era setting of Black Butler. Tohru Honda might be mistaken for a servant in the Phantomhive household. Her kind nature could either be a source of confusion or a way to bring some warmth to the often - dark and brooding environment. And Sebastian might be intrigued by the Sohma curse, seeing it as an interesting oddity in his long existence.