One common theme could be the development of their relationship. Since it's fanfiction, it might explore different aspects of how they get closer to each other.
Love and family are common themes. Since they are in a rather unique family situation, many fanfictions explore how they navigate their love for each other within the family context.
The theme of sacrifice also appears frequently. Sometimes one of them has to sacrifice something, like a personal dream or a friendship, for the sake of their relationship. This adds a layer of depth to the stories and makes the relationship between Keita and Ako seem more complex and real.
I'm not sure about specific 'keita and ako lemon fanfiction' as it might be quite niche. You could try searching on fanfiction - specific websites like Archive of Our Own. There might be some works there related to your request.
I'm not very familiar with this specific 'kiss x sis keita x ako fanfic'. But generally, a fanfic like this might explore the relationships and interactions between the characters Keita and Ako from 'kiss x sis'. It could be about their growth, emotional bonds, or adventures within the context of the story's setting.
One great fanfiction could be 'Ako and Keita's School Days'. It focuses on their daily adventures at school, including how they handle the unique situation of their relationship in a school setting. There are also some really sweet moments between them that are well - written.
Another interesting one is 'The Promise of Keita and Ako'. In this story, they make a promise to each other that has a significant impact on their relationship. It's full of emotional moments and shows how much they care for one another in a more profound way.
Typical themes might include the relationship development between Riko and Keita. It could involve their daily interactions, how they handle the unique situation of their relationship in the context of the 'kiss x sis' story.
One common theme is friendship. Since they are often characters in the same story or universe, fanfic writers like to explore their relationship as friends, how they support each other through difficult times.
In a 'kiss x sis keita x ako fanfic', we could expect a deep dive into the emotions of the two characters. The author might use vivid descriptions to show how Keita feels about Ako's presence, her actions, and vice versa. It could also include some elements of the original 'kiss x sis' story, like the unique family dynamics, and how that affects Keita and Ako's relationship.
One common theme is friendship. Rinko and Ako's bond as friends and bandmates is often explored. Another theme is music. Since they are part of a band in Bang Dream, fics might focus on their musical growth, like learning new techniques or writing new songs together.