Love and friendship are quite common themes. Writers often explore how their relationship could develop from a simple acquaintance to something deeper. Another popular theme is adventure, where they go on quests or face challenges together.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics, and you can simply search for'sebastian x claudette' in the search bar. There might also be some on Wattpad, but AO3 is more likely to have a wider variety.
One popular theme is romance. Fans often write about Sebastian Stan's characters falling in love with original characters or other known characters. For example, Bucky Barnes (played by Sebastian Stan) having a romantic relationship.
A common theme is competition. Since they are both highly capable demons, they often compete for various things, such as souls or power. This competition can drive the plot forward and create a lot of tension in the fanfic.
One popular theme is Sebastian's relationship with Ciel in different AU (alternate universe) settings. For example, in a modern AU, how they adapt to a world without the traditional master - butler dynamic. Another theme is exploring Sebastian's past as a demon, like his experiences before making the contract with Ciel. And some fanfics focus on Sebastian's interactions with other characters from the 'Black Butler' universe in unexpected ways, such as teaming up with Grell for a particular task.
Some fanfictions explore the concept of Sebastian's true nature as a demon and how it affects Ciel. For example, his demonic abilities might both protect and endanger Ciel at the same time. The theme of revenge also comes up a lot. Ciel's quest for revenge and how Sebastian aids him in it can be a central plot. There's also the theme of sacrifice. Whether it's Ciel sacrificing something to keep Sebastian by his side or vice versa, it adds an interesting layer to the stories.
There are also themes of sacrifice. Maybe one of them has to sacrifice something for the other. It could be a personal goal, a possession, or even a relationship with someone else. This theme can create a lot of drama and emotional tension in the fanfic. Also, the theme of acceptance is common. They accept each other's flaws and differences, which strengthens their bond.
One common theme is friendship. Since they may come from different backgrounds, the fanfics often explore how they become friends. For example, they might have to overcome initial misunderstandings.
A common theme is rivalry. Since Sebastian and Claude are often portrayed as rivals in their original context, many fanfics build on this, showing their intense competition.
One common theme is friendship. Many fanfics explore how Stefano and Sebastian form a strong bond, often starting from a place of distrust or indifference and evolving into a deep friendship. For example, they might start as rivals in a particular setting and gradually realize they have more in common than they thought.
Well, a frequent theme is transformation. The Beast is often in a state of transformation, either physically or emotionally, and Sebastian can play a role in that. Also, loyalty is a big theme. As their relationship develops, they show loyalty to each other in various situations. And there's the theme of acceptance. They have to accept each other's flaws and unique qualities. For example, in many fanfics, Sebastian accepts the Beast's wild side and the Beast accepts Sebastian's sometimes over - curious nature. This acceptance is what makes their relationship so endearing in these stories.