I'm not sure if there is a specific fanfic precisely named like that. There are a vast number of fanfics in different fandoms, and it would require a lot of searching through relevant fanfic platforms to determine. Some fanfics are quite niche and might not be easily found.
One aspect to consider in this fanfiction could be the power dynamics. If Yuichiro is dominant, it might lead to interesting character interactions with Mikaela. For example, Yuichiro could be the one making decisions in their adventures together, while Mikaela might play a more supportive role. It also adds an element of tension and drama to their relationship, as the dominant - submissive dynamic can create various scenarios for character growth and conflict.
You can try fanfiction websites like Archive of Our Own. There are likely to be several Ageha Kurono fanfics there. Just use the search bar and type in 'Ageha Kurono' to find relevant stories.
I'm not entirely sure as it seems like a rather strange and perhaps made - up or very niche concept. It could potentially be some sort of fan - created fictional story related to a character named Ageha Kurono with some sort of odd or creative element called 'breast missiles' which might be a very imaginative and out - of - the - box idea within the context of that specific fanfic.
One common theme is the deep emotional bond between them. Given their relationship in the original work, fanfictions often explore how they support and care for each other on a more profound level. Another theme could be adventure, where they go on quests together and their relationship develops during those experiences.
I'm not that familiar with 'yuichiro hyakyua' crossover fanfiction, but often in crossovers, themes like friendship between characters from different worlds can be common. Maybe also the exploration of different powers or abilities when the characters interact.
Survival is also a big theme. When he is in a crossover with a more dangerous world, like a post - apocalyptic or a world full of powerful enemies, Yuichiro has to use his skills and wits to stay alive. It creates a lot of tense and exciting moments in the fanfiction.
I'm not entirely sure as I haven't read it in detail. But generally, it might be about Kurono's experiences in a war, perhaps his battles, his growth as a character during the war, and the relationships he forms with other characters in the context of the war.
It could be about her adventures in a fantasy world. Maybe she's on a quest to save her homeland or discover some hidden powers. Another theme could be her relationships with other characters, like forming deep friendships or having rivalries.