One popular one might be 'Love in the Akademi' which has a great plot where Ayano tries to protect the male reader character from various school threats. It's full of suspense and a bit of romance.
You can start by checking out fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'Ayano Aishi x Male Reader' in the search bar, and a bunch of stories will come up.
Kazuma, for instance, might be initially shocked but then become very protective. He could use his powers to safeguard Ayano and the unborn child from any potential threats. Her family members could have mixed reactions. Some might be overjoyed at the prospect of a new addition to the family, while others could be worried about how it will affect the family's status or reputation in the world of Kaze no Stigma.
In fanfiction, Kazuma can be seen as a bit of a risk - taker. He is not afraid to try new things or go into the unknown. Ayano is usually very empathetic. She can understand the feelings of others easily. Their relationship in fanfiction is often based on mutual respect. They support each other through different adventures and challenges, with Kazuma being more action - oriented and Ayano being more of a thinker in many of the stories.
I'm not sure which specific 'Budo and Ayano' you are referring to. There could be many fictional characters with these names. Without more context, it's difficult to tell their love story.
A common theme is self - discovery. Ayano and Kazuma may discover new aspects of themselves through their interactions. Another is the theme of sacrifice. They might be willing to sacrifice for each other. Also, the theme of family can be present, either their own families or them creating a family - like bond. In some fanfics, they are like family to each other, supporting and protecting one another no matter what.
Often, they feature strong character development. For example, Ayano might start as a shy character and gradually become more confident in the relationship with Kyoko.
Perhaps they are at a school event. Ayano is part of the decoration committee and Kazuma is helping out. They start to tease each other about who can do the better job. As they work side by side, their hands brush against each other, and they exchange flirty glances. Kazuma might say something like 'You look really cute when you're focused.' and Ayano would giggle in response.