It could explore their relationship dynamics. For example, how Shu, who is often aloof, would deal with the responsibility of impending fatherhood. And how Yui, as the one carrying the child, would cope with the changes in her body and the situation.
Yes, there are likely some fanfictions out there with such a plot. 'Diabolik Lovers' has a large fan base, and fans often create various fanfictions exploring different relationships and scenarios. However, the quality and nature of these fanfictions can vary greatly.
One possible scenario in a fanfiction could be that Ayato finally overcomes his more possessive and aggressive tendencies towards Yui. After a series of adventures and challenges within the Diabolik Lovers' world, they realize their deep love for each other. Ayato might propose to Yui in a very romantic way, perhaps in the garden where they often have their more tender moments. Their wedding could be a small, private affair with only the closest of friends and family (from what they consider family in that world). Yui would look stunning in a simple white dress, and Ayato would be in his finest attire. It would be a celebration of their love that has managed to bloom despite all the darkness around them.
In a fanfiction, Yui and Ayato could go on an adventure together. They might find themselves in a mysterious part of the mansion that no one has explored before. As they face various challenges there, they have to rely on each other. Ayato, who is usually so self - assured, might start to see Yui in a new light as her bravery and determination shine through.
Yes, there might be some. You can start by looking on fanfiction platforms like FanFiction.net or Archive of Our Own. Search for Diabolik Lovers and filter for stories that involve Yui's pregnancy but are rated for general audiences. Some authors may write about the concept in a more innocent and family - friendly way, perhaps focusing on the emotional aspects of the situation rather than any inappropriate content.
A plot idea could be that Yui gets sick with a strange illness that only Shu can cure because of his unique vampire abilities. This forces Shu to confront his feelings for Yui as he tries to save her. Or perhaps they find an ancient prophecy that involves them and they must journey together to fulfill it, facing many obstacles along the way and growing closer as a result.
In these fanfictions, a common theme is the transformation of the characters. Yui's pregnancy can trigger a transformation in her personality, making her more assertive or protective. For the vampires, it can also change their views on life and death. Another theme is the power dynamics. The pregnancy can shift the power balance among the characters. And of course, there's the theme of love. Whether it's the love between Yui and the vampires or the love for the unborn child, it often plays a central role in these stories. There may also be themes related to the supernatural nature of the pregnancy, such as how the vampire - human hybrid baby might affect the world around them.
Well, perhaps in the fanfiction, Yui discovers she's pregnant and is filled with a range of emotions from joy to fear. Ayato, on the other hand, is excited in his own way as it's a sign of his dominance over Yui. The story could then focus on how they navigate the changes in their relationship, like Ayato having to be more responsible and Yui having to deal with the physical and emotional changes of pregnancy while living among vampires.
One possible plot could be that Yui discovers she's pregnant and is filled with a mix of fear and joy. Ayato, initially shocked, then becomes overprotective. They might face challenges from the other vampire brothers who are either jealous or worried about the implications. Yui would have to deal with her changing body while also trying to fit into the dangerous vampire world. Ayato could struggle with his own vampire instincts and how to be a good father figure.
One interesting fanfiction could be 'A Moonlit Encounter'. In this, Shu and Yui might have a more in - depth conversation under the moonlight, exploring their complex feelings for each other in a very emotional way. Another could be 'The Melody of Their Hearts' where music plays a big part in bringing them closer. There could be a scene where Shu plays a song for Yui that expresses his hidden emotions towards her.
Their relationship would become more intense. Ayato would likely be more possessive and protective of Yui. He'd be constantly by her side, fearing for her and the baby's safety. Yui would rely more on Ayato, and their bond would deepen as they face the new challenges together.