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.
A plot could involve a time - travel scenario. Kojou gets sent back in time and has to relive certain events without Yukina. When he finally figures out a way to get back to his own time, he realizes how much she truly means to him. Meanwhile, Yukina in the present is also trying to find a way to bring him back, and their love remains strong throughout this trial.
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.
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.
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.
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.
In Yukina and Kojou fanfiction, Yukina is often portrayed as a strong - willed and determined character. She is usually very skilled in combat and has a sense of duty. Kojou, on the other hand, might be shown as a bit of a rebel with a good heart. He has his own power that he is still learning to control.
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.
A great plot for Strike the Blood fanfiction could be a time - travel scenario. Kojou is sent back in time to a period when vampires were first emerging. He has to use his modern - day knowledge and powers to survive in this ancient and dangerous time, while also trying to find a way back to his own time. This would allow for a lot of world - building and exploration of the vampire lore in the series.
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.
One idea could be an OC who is a powerful vampire hunter sent to the island where the story takes place. They initially clash with the main characters but end up teaming up to face a greater threat. For example, a new type of ancient vampire that is immune to the usual methods of slaying.
Another plot could focus on the origin stories of some of the side characters. For instance, the backstory of Yukina Himeragi. How did she become an attack mage? What kind of training did she go through? A fanfic could expand on this and also show how her past experiences influence her actions and relationships in the present story.