I'm not sure specifically about a 'Subaru and Yui pregnant' fanfiction. You could try searching on fanfiction - specific websites like Archive of Our Own or FanFiction.net. They have a vast collection of fan - made stories, and you might be able to find something related there.
Well, perhaps in the fanfiction, Subaru and Yui have been trying for a while to have a baby. When they finally find out Yui is pregnant, they are overjoyed. But then they face challenges like financial difficulties as they prepare for the baby. Or there could be some sort of mystery or danger that threatens the pregnancy, and they have to fight to keep the baby safe.
One common theme is friendship. Since Subaru and Yui are often depicted as friends in the original works, fanfictions tend to explore different aspects of their friendship, like how they support each other through tough times.
Well, let's consider each character. Shu would probably be indifferent at first, but as things progress, he might start to worry about how it could disrupt his lazy lifestyle. Ayato would be envious and might try to cause some trouble for Subaru. Laito would make inappropriate comments and try to get a rise out of them. Reiji would be the one trying to keep everything in order and make sure they follow proper procedures. Kanato would be a bit of a wild card, perhaps being overly possessive or acting out. Yui would be relying on Subaru for support, and Subaru would be ready to fight anyone who threatened his family.
If Yui and Subaru were pregnant in the fanfiction, it could start a whole new arc in the Diabolik Lovers story. The family might be divided on how to handle this situation. Some might see the baby as a new hope or a way to gain more power. Subaru would have to grow up quickly and face his responsibilities. Yui would have to deal with the physical and emotional changes of pregnancy in a world full of danger. Their love for each other could be tested as they navigate through this difficult and unexpected situation.
There's a fanfiction titled 'Subaru and Yui: A New Beginning'. In this story, Subaru and Yui find themselves in a completely new environment, away from their usual settings. They have to adapt and in the process, their relationship deepens. It has really interesting character development and a great plot that keeps you hooked from start to finish.
There are many great authors out there. One author who stands out is 'RosePetalWriter'. Their works often have great character development for Subaru and Yui, and the plots are very engaging.
One good place to start looking for such fanfiction is on Archive of Our Own (AO3). There are often many well - written stories there about various relationships, including ones involving Yui and Subaru. Just search for 'yui and subaru kiss' in the search bar, and you'll be presented with a list of relevant fanfictions.
Love and redemption are common themes. Subaru often has a troubled past, and through his relationship with Yui, he finds a sense of redemption. Yui's love helps him heal. For example, in many stories, Subaru's initial coldness melts away because of Yui's unconditional love.
Another interesting plot could be that Yui gets sick, and Subaru is the only one who can take care of her. He has to overcome his own insecurities and fears to be there for her. He might learn more about himself and his feelings for Yui during this time. As he nurses her back to health, their relationship deepens in a more tender and emotional way.