The timing of Kuroshitsuji manga updates isn't fixed. Sometimes it depends on the author's schedule or publisher's plans. You might want to keep an eye on related fan forums or news sites for any announcements.
Well, a Kuroshitsuji Sebastian x Reader fanfic often explores the relationship between the reader and Sebastian. It can range from romantic encounters to adventures they might have together. The allure of Sebastian's character, with his dark charm and loyalty to Ciel, makes for an interesting dynamic when paired with an original reader - inserted character.
One of my favorite scenes in Ciel x Lizzy fanfiction is when Lizzy stands up for Ciel in front of others. It shows her loyalty and her growth from a somewhat sheltered girl to someone who can be a protector. Another great scene is when Ciel lets his guard down a little around Lizzy, like sharing a quiet moment in the garden. It's a rare moment of vulnerability for him.
Another idea is to create an alternate universe where Ciel and Sebastian's relationship is different. Maybe in this universe, they are friends from the start instead of having a master - servant contract. This could lead to all sorts of different adventures and interactions between them.
The 'kuroshitsuji book of circus side story' mainly follows the adventures and investigations of Ciel and Sebastian in the circus setting. It involves uncovering the secrets and dark happenings within the circus troupe.
In Kuroshitsuji fanfiction, Ciel and Lizzy often have a complex relationship. Lizzy is initially presented as a somewhat naive girl, but she has a deep affection for Ciel. Their relationship can be seen as a blend of childhood friendship and something more. Ciel, on the other hand, is burdened with his revenge and his role as the Earl. Sometimes, in fanfiction, their relationship is explored in different ways, such as Lizzy becoming more aware of Ciel's true self and trying to support him despite his dark secrets.
Start with creating your characters. Even if you're using the existing characters from Kuroshitsuji, you might want to add some new traits or backstories to them. For example, if you're writing about Grell Sutcliff, you could give him a different motivation for his actions. After that, plan out your plot. Think about the beginning, middle, and end of your story. Make sure there are some interesting twists and turns to keep the readers engaged.