Yes, there are likely some fanfictions out there about Hikari and Kei getting married in the Special A universe. You can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just type in relevant keywords such as 'Special A Hikari Kei married' and you might find some interesting reads.
One possible plot could be their adjustment to married life. Maybe Hikari is still as headstrong as ever and Kei has to find new ways to deal with her. For example, Hikari might take on a big project at work and Kei has to support her while also managing his own business affairs. Another aspect could be their family planning. They might discuss having children and the challenges and joys that would come with it.
There could be a 'kei and hikari baby fanfiction' where the baby gets lost in a magical world. Kei and Hikari then have to go on an adventure to find their baby, meeting all sorts of interesting characters along the way. They face challenges that test their love for each other and their determination to get their baby back.
You can start by looking on popular fanfiction platforms like Archive of Our Own (AO3) or Fanfiction.net. These sites have a large collection of fanfictions, and you can use the search function to specifically look for stories about Hikari and Kei's kiss. Just type in their names and relevant keywords like 'kiss' in the search bar.
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.
You should create a vivid setting for the story. If it's a fantasy world, describe the magical elements that will interact with the baby. Also, develop relationships. For example, how the baby's presence affects Kei and Hikari's relationship with their friends and family. It's important to make the baby a believable character too, even if it's just a baby. Give it unique traits like a particular laugh or a way of looking at things. This will make the fanfiction more engaging.
It might also be about the characters themselves. Hikari and Kei could have unique personalities that make their kiss interesting. If Hikari is shy and Kei is more bold, the dynamic between them during the kiss can be really exciting. The way they interact, how Kei might take the lead while Hikari blushes and hesitates at first, can create a really engaging scene in the fanfiction.
I'm sorry, I don't have specific titles at hand. But you can try looking on popular fanfiction websites. Search for tags related to 'Special A', 'Kei', and 'Hikari' to find some good ones.
I'm not entirely sure as I haven't played it specifically. But generally, a visual novel often involves a story with characters, plotlines, and usually some form of choice - making for the player. It might be about a journey in search of light, as 'hikari wo motomete' can be translated as 'in search of light'.