One possibility is that Sebastian, being a demon bound to Ciel, initially resists this order out of his demonic nature. But as the story progresses, he starts to develop a strange form of 'love' that is a mix of his loyalty and a newfound emotional connection. Maybe Ciel makes this order as a way to gain more control over Sebastian in their complex relationship.
Well, the plot could involve Ciel feeling a sense of loneliness and insecurity despite having Sebastian by his side. So, he orders Sebastian to love him. Sebastian, who is used to following orders, tries to understand the concept of 'love' in the human sense. He might study human emotions and relationships, and in the process, his interactions with Ciel become more tender and affectionate, leading to a very different kind of master - servant relationship.
In such a fanfiction, perhaps Ciel orders Sebastian to love him because he realizes that their relationship lacks an emotional depth that could be beneficial. Sebastian, then, might try to fake love at first. However, through various events like facing danger together, he might gradually start to truly feel something resembling love, which would change the dynamic between them completely.
Sebastian would likely approach the order with his usual calculating mind. He would analyze what Ciel means by 'love'. He might recall how humans show love in different ways. He could start by being more physically close to Ciel, like standing closer or gently touching Ciel's shoulder. Emotionally, he would try to mimic the emotions he has seen in humans who are in love. But deep down, he is also conflicted as his demon nature doesn't fully understand or embrace this concept of love.
In this fanfiction, it could be that a powerful force in the underworld wants to see what would happen if a human and a demon had a child. So, it manipulates events to make Ciel pregnant. Ciel and Sebastian would initially be shocked but then gradually accept the situation. The story could detail how Sebastian protects Ciel during the pregnancy, how they prepare for the baby's arrival, and how they raise the child in a world that is not so accepting of their unique family situation. It could also show the growth of their relationship as they face this new chapter in their lives together.
Well, it could be that Ciel gets a concussion while trying to solve a mystery in the underworld. Sebastian finds him unconscious and takes him home. As Ciel wakes up with a concussion, his vision is blurry and he has trouble recognizing Sebastian at first. This causes Sebastian to feel a strange sense of unease. He then devotes all his time to helping Ciel recover, and during this time, Ciel starts to rely on Sebastian more than ever, which changes the power balance between them a bit.
Well, in non - lemon fanfic, Sebastian is often depicted as a sophisticated, powerful demon who is bound by contract to serve Ciel. Ciel is a young, determined noble with a dark past. But in lemon fanfic which is inappropriate, it may distort their characters in improper ways for the sake of adult - themed content. So it's better to focus on their proper character traits from the original source like Sebastian's loyalty (in a non - inappropriate sense) to the contract and Ciel's intelligence and drive to seek revenge.
One plot idea could be that Sebastian discovers Ciel's praise kink during their daily interactions. Maybe Ciel blushes or shows a different reaction when Sebastian accidentally gives him a compliment. This could then lead to Sebastian using praise as a way to manipulate Ciel or to strengthen their bond in a more complex way.
A pregnancy plot in a Sebastian - Ciel Paris fanfic would be a very unique take. It would likely involve a significant departure from the original story's themes. Maybe the Paris setting could add some elements of mystery and romance. For example, they could encounter a powerful witch in Paris who casts a spell on Ciel that has unforeseen consequences related to pregnancy. Or perhaps in this fanfic, Sebastian and Ciel have a different kind of relationship that develops over time in Paris, leading to a situation where a pregnancy could be a part of the story. But it would definitely be a controversial and unexpected plot development.
A common theme is redemption through love. Since Sebastian is a demon, sometimes the fanfictions explore the idea that Ciel's love could redeem him or change his demonic nature. Also, the idea of soulmates is quite popular. Given their unique connection in the original series, many fanfictions play with the concept that they are meant to be together on a deeper, almost fated level. There are also fanfictions that focus on the development of their relationship over time, starting from their initial master - servant relationship and evolving into something more romantic.
At first, Sebastian may be confused. Demons don't typically deal with pregnancy. However, his loyalty to Ciel would make him take on the role of a protector very seriously. He would be constantly vigilant, making sure Ciel has proper nutrition and rest. He might also start to feel a strange sense of possessiveness over Ciel and the unborn child, which is a new emotion for him as a demon. And he would have to deal with his own internal struggle as his demon nature clashes with this newfound care for Ciel and the pregnancy.
Since I haven't read it, I can't say for sure. But it might be about Sebastian and Ciel in a situation where they are bound together in some way and are at rest. It could be a moment of peace between them in a world full of chaos and danger that they usually face in the Kuroshitsuji universe.
Sebastian and Ciel lemon fanfiction often explores the complex relationship between the two characters in a more intense and sometimes romantic or angsty way. These fanfictions can vary greatly in quality. Some may focus on the power dynamic between Sebastian, the demon butler, and Ciel, his young master. For example, they might depict how Ciel's vulnerability and Sebastian's unwavering loyalty (albeit with his own demonic motives) can be twisted into a more passionate connection in the fictional world created by the fanfic author.