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.
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.
He could try to reason with Sebastian. Kurt is intelligent and articulate. He might try to talk Sebastian out of whatever his plan is, appealing to his better nature or trying to make him see the consequences of his actions.
Brittany would probably be super excited for Santana. She'd be all about helping with baby clothes and nursery ideas. As for Sebastian's friends, they might be a bit shocked at first since he has a bit of a playboy image. But then they'd come around and offer their support in their own ways.
Well, there are also those characters who might be a bit shocked or confused. Take Levi from Attack on Titan. He's a very serious and no - nonsense type of character. If he were to read some of the fanfic about him that deviated too much from his own self - perception, like being made into a comical or overly emotional character in the fanfic, he might be taken aback at first. But then he might also realize it's just a different interpretation and not take it too seriously.
Well, it depends on the nature of the fanfiction. Some anime characters might be amused if the fanfiction is light - hearted and full of comical situations. For example, if it's a fanfic about a cooking competition among the characters from a shonen anime, they might react with good - natured laughter and competitiveness. They could also be confused if the fanfiction takes their story in a very strange or unexpected direction, like suddenly making a character from a historical anime end up in a space adventure.
Some Avengers might be really confused at first. For example, Tony Stark would probably be intrigued yet find it a bit odd. He'd be analyzing it like he does with new tech, trying to understand the appeal and the different universes within the anime fanfiction.
One great anime react fanfiction could be one where the characters from 'Naruto' react to modern technology. It's interesting to imagine how Naruto and his friends would be amazed by smartphones or the internet. Another could be characters from 'Attack on Titan' reacting to a world without Titans, exploring their newfound peace and how they adjust to normal life. There are also many 'My Hero Academia' react fanfictions, like the heroes reacting to different villain strategies from other universes.
There are lots of alternatives. For example, you can explore fanfics that center around Sebastian's growth as a character, his skills, or his interactions with other characters in a platonic sense. This way, you can still enjoy the character without getting into inappropriate content.
Kakashi would be very observant. He would look for how the fanfiction writers understand the world of Naruto, the values and the moral lessons. He might even use some of the creative ideas from the fanfiction in his own teachings if he thought they were valuable and in line with the spirit of the original story.