One idea could be exploring how Ciel and Elizabeth handle the news. Maybe Ciel becomes overly protective, trying to keep Elizabeth safe from all possible threats. He could hire extra guards and limit her outings. Elizabeth, on the other hand, might feel a bit stifled but also understand his concern. Another plot could involve how their families react. Elizabeth's family might be overjoyed and start planning a grand celebration, while Ciel's family business and the underworld he's involved in could pose some challenges to the pregnancy, like potential enemies using it as a weakness.
Perhaps a story where Elizabeth and Ciel time - travel back to a period before all the tragedy in Ciel's life occurred. Elizabeth could then try to prevent the events that led to Ciel's current state. This would involve her getting to know a more innocent Ciel and also dealing with the consequences of changing the past, such as how it might affect their relationship in the present.
One idea could be exploring how they adjust to the news. Maybe Mr Darcy becomes overly protective, while Elizabeth is determined to maintain her independence during the pregnancy. They could face challenges from society, like gossip and speculation about their quick family expansion.
One idea could be a story where they go on an adventure together to solve a mystery in their town. They might face various challenges that test their friendship and loyalty.
One plot idea could be that the kiss is a moment of realization for Ciel. Maybe he has been so focused on his revenge that he has overlooked his feelings for Elizabeth. The kiss makes him question his priorities and whether he can have a normal life with her. For example, he might start to consider giving up some of his more dangerous undertakings in the underworld to protect Elizabeth.
One plot idea could be Elizabeth's journey through pregnancy in a society with strict social norms. She might face challenges in how she is perceived by the upper class. Another could be her relationship with Darcy during this time, perhaps they grow closer as they anticipate the new arrival. Also, it could explore how her pregnancy affects her friendships and family relations.
One idea could be that Claude discovers a hidden power within Ciel that even Ciel himself is unaware of. This power could be related to Ciel's past or family heritage. Another plot could be that Claude has to protect Ciel from a new and powerful enemy that is specifically targeting Ciel for some unknown reason. Maybe this enemy has a connection to Claude's past as well.
One plot idea could be the reader being a new servant in the Phantomhive manor. Ciel is initially suspicious but as time passes, he starts to trust and rely on the reader in a unique way. Maybe the reader has a special skill that helps Ciel in his investigations or in dealing with the other nobles.
One idea could be Sebastian protecting Ciel from other alphas who see Ciel as a desirable omega. Another could be Ciel struggling with his omega instincts while trying to maintain his role as the head of the Phantomhive family. Maybe Sebastian and Ciel could go on a journey together where they have to rely on each other and their bond deepens as a result.
Love and devotion are very common themes. Most fanfictions focus on how deeply Elizabeth loves Ciel and vice versa, despite all the difficulties they face.
Another plot could involve the reader being a magical being, like a fairy or a witch, who is on a mission to protect Ciel from a dark magic that is threatening him. This would create a lot of opportunities for magical elements and a relationship that develops as the reader uses their powers to keep Ciel safe. They might have to go on quests together to find magical artifacts to counter the dark magic. It's a plot full of adventure and mystery.