The appeal might be in the unexpectedness. If in the original story their relationship is not that developed towards a kiss, seeing it in fanfiction can be exciting.
It could be the chemistry that fans imagine between them. Fans often love to explore the romantic side of characters that might not be fully explored in the official story. Issei and Ravel might have certain traits that, when combined in a romantic scenario like a kiss, are really interesting. For example, Issei's bravado and Ravel's elegance could create a unique dynamic in a fanfiction kiss scene.
Many fans are drawn to the idea of seeing their favorite characters in a more intimate moment. A kiss is a very emotional and significant moment in a relationship. In Issei and Ravel kiss fanfiction, it allows fans to delve deeper into the emotional connection they could potentially have. It also gives fans the chance to see the characters in a different light, away from the main plot of the original story, and explore a more personal and romantic side of them.
One factor could be the fan base's desire for romantic or intimate moments between the characters. Fans love to see their favorite characters in different scenarios, especially ones that involve some form of affection like a kiss. In the case of Issei and Ravel, it might also be about the potential for their relationship to develop in unique ways that the fanfiction writers can explore. For example, how their personalities interact during and after such a moment. Additionally, the fanfiction gives fans the opportunity to be part of the creative process, adding their own ideas and interpretations to the relationship.
You can try looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). Just search for 'Issei and Ravel' in the search bar on those sites and then filter through the results to find ones that might include a kiss scene.
I think Reddit can also be a good source. There are subreddits dedicated to the series that Issei and Ravel are from. You can post a request for Issei Kiss Ravel fanfiction there, and chances are some kind-hearted fans will point you in the right direction. Some users might even share their own unpublished works or recommend their favorite ones from other sites.
One reason for the popularity could be the appeal of the characters Issei and Ravel themselves. Fans who love these characters might be interested in seeing their relationship take on a more romantic or even sensual turn in a lemon fanfic. Also, the lack of such explicit exploration in the official content might drive fans to seek it out in fan - made works. Additionally, the creativity of the fanfic authors in developing their relationship and the scenarios they create can contribute to its popularity.
One common theme is probably the development of their relationship. It might show how they grow closer over time, from initial acquaintance to falling in love and finally getting married.
You can try searching on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in the relevant keywords 'Issei Marries Ravel' in their search bars, and you might find some interesting stories.
The genre - bending aspect is also appealing. If Issei is from a non - vampire related series originally, seeing him in a vampire fanfiction can be a fresh take. It combines two different elements that might not be expected to go together at first, and this unexpectedness can draw in readers who are looking for something new and different in their fanfiction reading experience.
To develop their relationship realistically, start with them as friends. Have them share common interests like training or exploring the supernatural world. Then gradually introduce moments of deeper connection, like when one saves the other from danger.
Well, there could be a story where Issei gets injured badly, and Ravel takes care of him. During this time, they start to see each other in a new light. It could also be about them participating in a tournament together, and their teamwork and growing bond make them a force to be reckoned with.
The appeal comes from the fact that it combines two interesting characters. Issei's growth throughout the story in the original work makes him a great character to pair with Kuroka. Fanfiction writers can play with their powers, their emotions, and their cultural backgrounds (since they come from different 'worlds' in the story). It gives a lot of room for creativity and exploration of different relationship aspects, from friendship to love.