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.
Yes, of course. Their unique personalities and relationships in the original work are the main sources of inspiration for fanfiction writers. Writers often base their stories on the existing characters' traits and the chemistry between them.
As far as I know, there are no official tickle - related events in a very direct sense. However, the characters do have moments of light - heartedness and playfulness that could potentially involve tickling in fan interpretations.
One tickle story could be when Sebastian might playfully tickle Ciel as a way to amuse him during a less tense moment. Maybe when Ciel is feeling a bit down and Sebastian uses tickling to cheer him up, making Ciel giggle despite his usually serious demeanor.
Yes, it is quite popular among some segments of the Black Butler fan community. Mpreg (male pregnancy) fanfiction often explores unique and creative storylines within the existing Black Butler universe. It allows fans to delve into different relationship dynamics and scenarios that might not be part of the original canon.
There is indeed a 'Black Butler' visual novel. It features the same dark and alluring art style as the anime and manga. The visual novel might include different storylines, some of which could be exclusive to this format, providing a new perspective on the 'Black Butler' world. It often has a strong focus on character development and the complex relationships within the story, which is great for fans who want to explore more about the characters.