One common theme could be the exploration of their relationship dynamics. How they interact, their feelings for each other, and how they grow closer or face challenges together.
One way to find great 'kei x hikari lemon fanfiction' is to join relevant fan communities. People in these communities often share and discuss their favorite fanfictions. They can give you some really good suggestions based on their own reading experiences. Maybe there are some hidden gems that are not so well - known but are actually really well - written.
You can try looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms often have a wide variety of fanfics, including ones about Hikari and Kei Lemon. Just use the search bar and type in 'Hikari x Kei Lemon' to see if any relevant stories pop up.
One common theme is friendship development. Writers often explore how Hikari and Kei Lemon's relationship starts as acquaintances and gradually turns into a deeper bond. It could be through shared experiences or helping each other out in difficult situations.
I'm not overly familiar with 'kei hikari lemon fanfic' specifically. But generally in fanfics, it might have unique characterizations of the 'kei' and 'hikari' characters. The 'lemon' part might imply some sort of citrus - themed elements or it could be a code for something else within the context of the fanfic world, perhaps related to a particular setting or plot device.
There may or may not be a lot of 'kei and hikari married' lemon fanfiction. It really varies. Some fanfiction writers might be interested in exploring this kind of romantic and perhaps more mature relationship between the two characters. But the availability also depends on how widespread the fan base for these characters is. And as mentioned before, the 'lemon' aspect might limit the places where you can find such fanfiction.
Sorry, I don't have any specific 'kei and hikari married' fanfiction to recommend off - hand. But you could start by looking at general fanfiction aggregators. Check the tags related to the characters and look for stories that focus on their married life in a more innocent or general romantic way.
One way to find 'kei and hikari lemon fanfiction' is to join relevant fan communities. People in those communities often share their favorite fanfics, which could lead you to some great reads about Kei and Hikari.
One interesting aspect could be the unique character dynamics. Kei and Hikari have distinct personalities, and in fanfiction, their interactions can be explored in new and creative ways. For example, how they handle challenges together or their developing relationship over time.