One common theme is romance. Given the idea of Issei kissing Akeno, the fanfictions often explore their relationship in a romantic context, with all the typical romantic elements like love confessions, dates, and relationship development.
Another theme could be adventure. Since they are characters from an anime world, fanfictions might incorporate them into new adventures. Maybe they go on a quest together and during that, the kiss becomes a significant moment in their journey, symbolizing a new level of their relationship.
One common theme is the development of their relationship. Since they often start with a certain dynamic in the original source, fanfictions like to explore how that relationship deepens and changes over time.
Another theme is adventure. Since Highschool DxD has a lot of action and supernatural elements, fanfictions might have Issei and Akeno going on adventures together, facing powerful enemies and overcoming challenges as a team. They could be fighting against other devils, angels or fallen angels in these stories. And often, these adventures also contribute to the growth of their relationship.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. They usually have a large collection of fanfictions, and you might be able to find the Issei and Akeno - related ones by using the search function.
In fanfiction, an Issei - Akeno kiss could signify a deepening of their connection. It could be a way for the author to explore the characters' feelings on a more intimate level. It might also be a plot device to create drama, like if there are other characters who have feelings for either Issei or Akeno and this kiss causes jealousy or conflict.
I'm not really into this type of fanfiction. However, generally, when Issei and Akeno are characters in fanfiction, they often bring out different aspects of their personalities. If it's a well - written one, it might explore their relationship in new and interesting ways, but hard lemon fanfiction might also involve inappropriate content that some people may not be comfortable with.
One reason could be the lack of such explicit exploration in the official story. Fans want to see more of the passionate side of Issei and Akeno's relationship. Also, lemon fanfiction allows for creativity in depicting their interactions, which might not be possible in the original, more family - friendly narrative. It gives fans a chance to delve deeper into their fantasies about the characters.
After the kiss, they could start a more official relationship. They might become more protective of each other and start to plan for their future together within the context of the fanfiction world.
A common theme is friendship. The stories often explore how Akeno and the OC become friends and support each other. Another theme is self - discovery. The OC might be on a journey to find themselves and Akeno helps in that process.
One common theme is the clash of cultures. Akeno comes from a different fictional universe, and when she enters the world of Harry Potter, there are differences in magic, social norms, and values that create interesting situations. Another theme is friendship. She forms new friendships with the characters in Hogwarts, and these relationships are often central to the story.
One interesting plot could be Akeno and Issei going on a secret mission together. They face various challenges and their relationship deepens during the process.