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 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 group of antagonists could be the ancient evil spirits that lurk in the shadows. They have been sealed away for a long time but are slowly breaking free and causing chaos. Their motives are often shrouded in mystery, and they pose a great threat to the main characters as they are extremely difficult to defeat due to their age - old and powerful magic.
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.
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.
Well, 'The Journey of Issei and Akeno' is another good one. It focuses on their journey of self - discovery while being in love. It has some really heartwarming scenes where they support each other, and the story also includes some interesting twists and turns that keep you hooked from start to finish.
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.
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.
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.