One idea could be that the reader is a lost traveler who stumbles upon the Phantomhive manor. Claude, being curious about this stranger, decides to keep an eye on the reader. As time passes, they start to have conversations about different worlds (the reader's world and the world of Black Butler). Through these exchanges, they develop a friendship.
Perhaps the reader is a detective investigating some strange occurrences around the Phantomhive manor. Claude is assigned by Sebastian to keep an eye on the reader. But instead of hindering the investigation, he ends up helping the reader because he's intrigued by their intelligence and determination. This leads to a relationship where they trust each other and slowly fall in love without any adult themes involved.
Yes, there are many. You can start by looking on fanfiction platforms like Archive of Our Own. There, you can filter for 'Claude Faustus x Reader' and then further filter out any works tagged with mature content. Some of these stories might focus on their relationship in a more platonic or developing-romantic way, such as them going through adventures together in the world of Black Butler or just having simple interactions that gradually build a connection.
Another idea is that the reader is a lost traveler who stumbles upon Claude in the forest. Claude initially has his own motives for helping the reader, but as they journey together to find the reader's way back home, they start to understand each other better. The reader might teach Claude about human emotions like kindness and friendship, and Claude might use his powers to protect the reader from various threats along the way.
A title like 'Claude Faustus and Sebastian Michaelis: A Forbidden Encounter in Fanfiction' would be interesting. It gives a sense of mystery and something that perhaps shouldn't be happening between them.
A third plot idea is that Reader is a painter. They are commissioned to paint a portrait of Claude, a nobleman. While sitting for the portrait, Claude and Reader start to have deep conversations. Reader discovers the kind heart beneath Claude's noble exterior, and Claude is charmed by Reader's creative spirit. Their relationship blossoms as Reader continues to paint and Claude becomes more and more involved in Reader's artistic world.
In uke claude faustus x sebastian fanfiction, the concept of 'uke' gives a particular slant to the relationship. It might imply a more submissive role for Claude in the story. This can lead to interesting plot developments where Sebastian takes on a more dominant position, perhaps in terms of decision - making or protecting Claude. The fanfiction could also delve into their backstories and how their past experiences shape their relationship in this new, fictional context.
One idea could be a love triangle situation where the reader is a servant in a grand manor served by both Sebastian and Claude. The reader is initially charmed by Sebastian's suave and proper demeanor but then finds herself drawn to Claude's mysterious allure as well. They both compete for the reader's affection in a series of events that involve solving mysteries within the manor and protecting the master.
One theme could be loyalty. Both Claude and Sebastian are servants, and their loyalty to their respective masters could be a point of conflict or connection in the fanfiction. For example, they might have to choose between their masters' wishes and their own relationship.
Another great one is 'Unexpected Allies'. In this fanfiction, they start to see each other in a new light after being in a difficult situation. The author does a great job of building up the tension between them and then gradually changing it into a more positive relationship.
A common theme is the exploration of a complex relationship. Given their different personalities and allegiances in the original source material, fanfictions often focus on how they navigate their relationship. Another theme could be loyalty and betrayal. Since they both have masters to serve, a situation might be created where their loyalties are tested against their feelings for each other.
You could also try reaching out to other Black Butler fans on social media platforms. Ask them if they know of any good 'claude faustus x reader' fanfics that are clean. Fans are often quite helpful and may be able to point you to some hidden gems that don't have any sexual undertones in the relationship between the characters.