Maybe Hikari suddenly gets an amazing job opportunity in a far - off place. This would force them to decide between following Hikari's career dreams and staying in their current comfortable life. It could lead to some really emotional and tense moments in the fanfiction.
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.
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.
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.
One possible plot twist could be that just before the wedding, Ayame discovers a long - lost relative who has some dark secrets about Kouga's family. This relative tries to stop the wedding by revealing these secrets to Ayame. Another could be that on the wedding day, an old enemy of Kouga shows up and challenges him to a fight, putting the wedding on hold. Or perhaps there is a misunderstanding where Ayame thinks Kouga has betrayed her trust in some way, like he made a deal with an enemy for the sake of the tribe but didn't tell her.
One possible plot twist could be a long - lost relative showing up at the wedding and revealing a family secret that threatens to stop the marriage. For example, if there's a feud in the family that was hidden from Heiji and Kazuha.
One possible plot twist could be that their marriage is part of a larger plan to infiltrate an enemy organization. They pretend to be a happily married couple but are actually gathering intel. Another could be that Neo's past catches up with her during the wedding, and they have to deal with old enemies trying to disrupt the celebration.
One possible plot twist could be that they face opposition from the Hidden Leaf Village. Since same - sex relationships might not be as openly accepted in the traditional ninja world. Another twist could be that they have to go on a dangerous mission together right after getting married, which tests their new relationship. And perhaps there's a secret enemy who wants to break them apart because their union represents a new kind of hope in the village.
Well, perhaps a plot twist could be that Naruto gets cursed. This curse makes him forget all about Ino and their relationship. Ino then has to go on a journey to find a way to break the curse. Along the way, she might face many challenges and meet new characters who either help or hinder her. Or maybe there's a twist where it's revealed that Ino was arranged to be married to someone else in her family long ago, and she has to fight against the family traditions to be with Naruto.
A third plot twist could be the appearance of an old enemy from either of their worlds. For instance, if one of Naruto's old foes teams up with an enemy from Esdeath's world. They would then have to put aside their differences and work together to defeat the common enemy, which could either strengthen or strain their marriage.
One possible plot twist could be that Hanare is actually a spy from an enemy village but has truly fallen in love with Kakashi. She has to choose between her loyalty to her village and her love for him. Another could be that just before the wedding, Kakashi discovers a long - lost family secret that makes him question whether he should get married. For example, he might find out that his family has some sort of curse that could affect Hanare.