The theme of sacrifice also shows up a lot. Ciel may sacrifice his own humanity in order to achieve his goals, and Sebastian may sacrifice his own freedom in a way by being bound to Ciel. And there's always the theme of the supernatural, with Sebastian being a demon and all the dark magic and otherworldly elements that come with that in the fanfics.
One great 'Black Butler Sebastian x Ciel fanfic' is 'A Bond Beyond Servitude'. It beautifully explores the complex relationship between Sebastian and Ciel. The author delves deep into their characters, showing how their fates are intertwined. Sebastian's loyalty to Ciel, which is tinged with his own demonic motives, is portrayed in an interesting way. It also has some really well - written dialogue that stays true to the original anime's tone.
In 'Black Butler', Sebastian and Ciel's relationship is complex. While there are strong emotional bonds and a deep sense of loyalty between them, it's not a typical romantic love. Sebastian is bound to Ciel by a contract, and his main goal is to consume Ciel's soul. However, their interactions often show a level of intimacy and dependence that can be misconstrued as romantic by some viewers.
In some fanfictions, Sebastian might be depicted as hating Ciel due to a power struggle. Ciel, as his master, constantly gives orders and Sebastian, being a powerful demon, may resent this subordination. He might long for more freedom and see Ciel as a hindrance to his own desires.
Some fanfictions revolve around the theme of trust. In the Black Butler universe, trust is a very fragile thing between Sebastian and Ciel. Fanfiction writers love to explore how this trust can be built, broken, and rebuilt. Another theme is the exploration of their individual traumas. Ciel's past trauma of losing his family and Sebastian's existence as a demon with his own kind of 'demonic trauma' can be the focus. Writers might show how they deal with these traumas in relation to each other. Additionally, the theme of identity is also present. Ciel's identity as the Earl and his true self, and Sebastian's identity as a demon but also his role as Ciel's servant are often explored in different ways in these fanfictions.
One way is to check out popular fanfiction websites like Archive of Our Own (AO3). It has a great tagging system. You can search for 'Black Butler' and then filter for Sebastian x Ciel stories. Look for the ones with high ratings and a lot of kudos or favorites. Another option is to join Black Butler fan groups on social media platforms. People there often share their favorite fanfictions. You can also ask for recommendations in those groups.
One interesting plot could be Female Ciel using her wits and charm to outwit her enemies with Sebastian by her side. For example, she might be involved in a complex political intrigue in Victorian society, and Sebastian helps her navigate through the dangerous web of lies and power struggles. He uses his demonic powers subtly to protect her while she tries to assert her influence.
Highlight the contrast between them. Female Ciel is human with human emotions and motives, while Sebastian is a demon with his own set of rules. This contrast can create great tension and chemistry. For example, when faced with a moral dilemma, Female Ciel's reaction might be very different from Sebastian's. Their exchanges during such moments can be used to deepen their relationship on paper.
Their relationship begins with the contract. Ciel, in his quest for revenge, summons Sebastian. As time passes, Sebastian becomes an essential part of Ciel's life, protecting him from various threats. Ciel starts to rely more and more on Sebastian, and Sebastian is always by his side. They face many challenges together, which deepens their bond, though it remains a master - servant relationship based on the contract.
The way Sebastian interacts with other characters in relation to Ciel can also show his hatred. He could be overly critical of Ciel in front of others or even try to undermine Ciel's authority subtly.