Since I don't know of any fanfiction specifically like that, you might start by looking at the most popular 'Strike the Blood' fanfictions. Read through the summaries and reviews to see if any of them might be heading in a direction that could be related to a pregnancy - like scenario for Yukina. You could also join 'Strike the Blood' fan communities and ask fellow fans if they know of any such stories.
I'm not sure if there is such a specific 'Strike the Blood' fanfiction where Yukina is pregnant. Fanfiction can cover a wide range of scenarios, but this particular one might be rare or not widely known.
I'm sorry, but 'lemon' fanfiction often involves adult or inappropriate content, so I can't recommend it. However, you can look for regular Strike the Blood fanfiction about Kojou and Yukina on fanfiction websites. There are likely many well - written stories that focus on their relationship, adventures, and character development in a non - inappropriate way.
Their relationship could develop through shared battles. As they fight side by side against powerful foes, they come to rely on each other more and more. This mutual trust can easily turn into deeper feelings of love. For example, when one is in danger, the other goes to extreme lengths to save them, realizing how much they care.
One common theme is the development of their relationship. Since in the original series their relationship has its own dynamics, fanfictions often explore how it could further develop, like them becoming more open about their feelings for each other.
One idea could be that they get separated due to a powerful enemy's scheme. Kojou tries desperately to find Yukina while she, on the other hand, is fighting her own battles to get back to him. Their love for each other gives them the strength to persevere through all the hardships.
In non - lemon fanfiction about Kojou and Yukina, the setting of the 'Strike the Blood' world is crucial. The different islands with their own mysteries and threats create a backdrop for their adventures. Their interaction with other characters also matters. For instance, how they deal with Kojou's friends or Yukina's comrades. Moreover, the emotional aspect is significant. Their unspoken feelings, moments of jealousy or protectiveness can add depth to the story.
Another place could be FanFiction.net. It has a large collection of fanfictions across different fandoms. However, the quality can vary. Look for stories with high ratings and a good number of reviews. That way, you can increase your chances of finding well - written Kojou x Yukina fanfictions.
One interesting Strike the Blood pregnant fanfiction could be about the challenges the characters face when a pregnancy occurs in the vampire - filled world. It might explore how the relationships change and how they protect the unborn. For example, in some fanfics, the male lead might become overly protective, adding a new dynamic to the story.
You can try looking on fanfiction - dedicated websites like Archive of Our Own. There are often many different works related to Strike the Blood, and you might be able to find some that involve pregnancy themes by using the search function and typing in relevant keywords.
One popular 'strike the blood crossover fanfiction' is the one that crosses it with another popular anime like 'High School DxD'. In this type of fanfiction, the characters from both worlds interact in interesting ways. For example, the vampires in 'Strike the Blood' might have to deal with the devilish politics in 'High School DxD'.