There might be such fanfiction out there. Fanfiction writers often come up with various scenarios for their favorite characters. However, it could be a bit hard to find just by randomly looking. You may need to use the right search terms on different platforms. For example, search for the names 'Kaito' and 'Aoko' along with the keyword 'pregnancy' on the relevant fanfiction platforms. If it exists, it may be among the results.
There are definitely some 'Kaito and Aoko kiss fanfiction' pieces out there. Some authors are really creative in how they bring these two characters together for that moment. They might add in some interesting plot twists, like a dangerous situation that makes the kiss even more intense, or they could write it in a more light - hearted and comical way, where it's a bit of a clumsy or unexpected kiss.
One great Kaito Kid x Aoko fanfiction is 'The Hidden Feelings'. It delves into the unspoken emotions between them. It has some really sweet moments where Kaito's charm and Aoko's feisty nature play off each other in an endearing way.
Well, it depends on your taste. There are fanfictions that focus more on the romantic aspect of their relationship leading to the kiss, while others might be more action - packed with the kiss as a side element. You could start by looking at the most popular ones on fanfiction platforms and see if they meet your expectations. If not, you can always try different search terms or filters to narrow down your search.
Another theme could be the element of surprise. Maybe Kaito is trying to keep his identity a secret from Aoko, and the kiss happens in a moment when she least expects it, which then adds a whole new layer of drama to their relationship. It can also be a theme of love conquering all, especially if there are obstacles in their relationship, like their different personalities or family backgrounds, and the kiss is a symbol that they can overcome those things.
One common theme could be unrequited love. Given their relationship in the original source, there might be fanfics exploring the tension between Kaito and Aoko when it comes to their feelings for each other in a more 'lemon' - ish, that is, romantic and perhaps a bit more passionate context.
One common theme is the secret identity aspect. Kaito Kid's double life often adds an element of mystery and tension to the relationship, which can be a big part of the fanfiction. Another is the unrequited love or the slow - burn romance that finally leads to the kiss.
I'm not sure exactly which 'kaito aoko lemon fanfic' you're referring to. There could be various fan - created stories out there. You might try searching on fanfic platforms like Archive of Our Own or FanFiction.net to find relevant works.