One common theme could be the exploration of their relationship. Since they are from a particular story, fanfiction might delve deeper into their emotional connection, perhaps how they support each other in different situations.
I'm not sure specifically about 'yona x shin ah lemon fanfiction' as it might be a rather niche area. You could try searching on popular fanfiction platforms like Archive of Our Own. They have a wide range of fanfictions and you might be able to find some related to Yona and Shin - Ah there.
In a fanfiction, Zeno and Shin - ah could have a spiritual journey. Since Zeno has his unique immortality and Shin - ah has his dragon powers, they might enter a dream - like realm where they meet the spirits of the past dragons. There, they learn about the true origin of their powers and the history of the dragons that has been long forgotten. This knowledge could then be used to help Yona in her quest to reclaim her kingdom.
A fanfiction could be set in a parallel universe where Zeno and Shin - ah are the main characters instead of Yona. They could be on a mission to find a cure for Shin - ah's dragon powers that are slowly consuming him. Zeno, with his immortality, would stop at nothing to save his friend.
The plot is also crucial. It could be an adventure set in the 'Akatsuki no Yona' world, where the reader and Shin Ah go on a quest together. Or it could be a more emotional story about Shin Ah opening up to the reader. Good grammar and spelling are a must as well. If the writing is full of errors, it can be really distracting. And the story should stay true to the overall tone and lore of the 'Akatsuki no Yona' series.
You could also join 'Akatsuki no Yona' fan communities on platforms like Reddit or Discord. Members of these communities often share their favorite fanfictions or even write and post their own. They might be able to point you in the direction of some great Shin Ah x Reader fanfictions. You can post a request in the community asking for recommendations too.
One common theme is the exploration of Shin Ah's reserved nature. The OC often helps him open up more. For example, in many stories, the OC is the one who encourages Shin Ah to share his thoughts and feelings.
Sure. You can try looking on fanfiction.net. There are often many works in this category. Just search for 'shin ah x oc' and you'll get a list of stories to explore.
Adventure could be another theme. If they are characters in a particular fictional world, fanfic authors may create stories where they embark on adventures together, facing challenges and growing closer through their experiences. In some cases, there could be themes of self - discovery as well. As they interact, they might learn more about themselves and their own capabilities.
Some Tumblr blogs dedicated to the 'Yona' fandom might also have links or posts about 'yona x hak lemon fanfic'. You can search for relevant tags on Tumblr, like #yona x hak #fanfic #lemon, and explore the posts to find the fanfics you're interested in.