There's also 'Elizabeth's Hidden Strengths'. This fanfiction focuses on Elizabeth's untapped potential. It shows her in situations where she has to use her wits and skills, which is quite different from her usual portrayal in the original work. It's a refreshing take on her character.
It's also because of the relationship she has with Ciel. Fans love to read different interpretations of their relationship, whether it's more romantic, platonic, or full of conflict. Fanfiction gives a platform to explore all these possibilities.
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 possible fanfiction could be about Ciel and Elizabeth having a lemon - themed picnic. They could be sitting in a beautiful garden, with Elizabeth bringing lemon - filled pastries and Ciel being a bit hesitant at first but then enjoying them. Another could be a story where they go on a trip to a lemon orchard and have various adventures there.
Their relationship can be explored through shared experiences with lemons. For example, they could discover a new lemon - flavored tea together and it becomes 'their' thing. This simple act can show how they bond over something new and different.
Ciel might start off seeing Elizabeth as just part of his obligation due to their engagement. But as time goes on in the fanfiction, he could start to notice her inner strength and kindness, which makes him develop deeper feelings for her. For example, if she stands by him during a difficult time, he'll see her in a new light.
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.
It could make Sebastian, Ciel's butler, more protective. He might see Elizabeth as a potential weakness for Ciel, or he could also view the relationship as something that could be used to further Ciel's goals. For example, if there are other noble families involved, Sebastian could manipulate the situation based on Ciel and Elizabeth's new - found closeness.
Definitely not. The Black Butler series has a set of established themes such as the supernatural elements, the Victorian - era setting, and the complex character relationships. The idea of a 'leashed slave story' is completely foreign to the official canon and is likely a disturbing creation outside of the proper series. It would go against the overall tone and moral framework of the official work.