It could also create some drama. Maybe Marinette still has feelings for Adrien, and the kiss with Luka makes her confused. This could lead to a complex love triangle - like situation where she has to figure out her true feelings.
There could be a lot of internal conflict. Marinette might be used to her shy yet determined self, and Adrien his more reserved but princely nature, and Luka his laid - back attitude. When merged, they'd have to reconcile these differences within the new entity. This could lead to a very character - driven story as they learn to function as one.
One possible plot could be that Luka has been mind - controlled by an akuma. In the Miraculous Ladybug universe, akumas often make people do things they wouldn't normally do. So, he kidnaps Marinette not out of his own will but because of the akuma's influence. Marinette might initially be shocked and scared, but then she could try to find a way to break the akuma's hold on Luka and save them both.
There are also some Miraculous Ladybug - focused fan communities on social media platforms like Tumblr or Reddit. Fans often share links to their favorite fanfictions there. You might find some great stories about Marinette and Luka's kiss by simply asking in the relevant groups or by searching through the existing posts.
Well, they might start to explore their relationship more deeply. Maybe Naruto would become more protective of Hinata, and Hinata would be more confident in their bond. They could go on dates and face challenges together as a couple.
The theme of hidden identities also exists. Given the context of the Miraculous world they live in, sometimes their identities as heroes or normal teens are explored in relation to their relationship. It adds an extra layer of mystery and drama to the fanfiction, making it more engaging for the readers.
One possible plot could be that Marinette and Luka are living a happy life with their baby. They might face some challenges in balancing their superhero/villain - fighting duties (if in the Miraculous Ladybug universe) and taking care of the baby. For example, they could be worried about protecting the baby from any potential threats related to their secret identities.
Marinette would likely be very frightened at first. She might scream or try to fight back. After all, being kidnapped is a terrifying situation.
They could face a lot of opposition. In the Naruto world, Naruto has his own set of friends and allies, and Guren is from a different group. Their kiss might lead to conflicts between different factions. For example, Naruto's friends might not trust Guren immediately, and Guren's side could also have issues with her getting involved with Naruto.
Well, after the kiss, perhaps they decide to participate in Pokemon contests together. Serena's expertise in contests and Ash's battle skills could combine in unique ways. They might also meet new friends and rivals along the way, all while their relationship deepens and they face challenges as a couple.
There's also 'The Luka - Marinette Connection'. In this fanfiction, the connection between Luka and Marinette is explored on a deeper level. It starts with Luka noticing Marinette's little quirks and how she tries to hide her feelings. As the story progresses, they start to open up to each other more. The author creates a really engaging story by adding in some mystery elements related to the Miraculous and how it might affect their relationship.