Well, power and its use can also be a theme. Given the nature of the characters, how they use their powers in relation to each other and in the face of challenges. It could be about how their powers either bring them closer or cause some friction in their relationship. Also, family dynamics might play a role, as their families could have an impact on their relationship in the fanfiction world.
Well, you can try searching on popular fanfiction platforms like FanFiction.net or Archive of Our Own. Just type in 'yoh asakura and anna lemon' in their search bars and you'll likely find some interesting pieces.
Love is a very common theme. Since they have a complex relationship in the original work, fanfiction often explores how their love develops and overcomes obstacles.
Adventure is also common. They are both on a path to become great shamans, so fanfics may send them on various adventures, like exploring ancient shamanic ruins or facing powerful, otherworldly foes.
Another theme is growth. In many fanfics, both Anna and Yoh grow as individuals as they face different situations together. They learn from their experiences and become better versions of themselves. For instance, in a fanfic where they participate in a competition, they learn about perseverance and the value of hard work.
Power dynamics can also be a theme. If Yoh and Anna have different levels of power or abilities in their original story, how they handle those differences in their relationship within the fanfic can be an interesting aspect. Maybe one is more powerful and has to protect the other, or they learn to combine their powers for a common goal, all while dealing with their personal feelings for each other.
One common theme might be growth. As they interact in the fanfic, they could both grow as characters. Maybe Anna learns to be more confident, and Yoh becomes more empathetic. Also, family - related themes can be present, like how their families influence their relationship or how they create a new family - like bond between them. It really depends on the creativity of the fanfic writer.
One common theme is probably the development of their relationship. In high school, they might face different challenges that test their bond. Another theme could be their growth as individuals. High school is a time of self - discovery, and fanfictions might explore how Yoh and Anna grow during this period.
One idea could be a story where Horohoro and Asakura Yoh go on a spiritual journey together. They encounter various spirits and have to use their combined skills to either help the spirits move on or solve some sort of mystery related to the spirit world.
You can try Archive of Our Own. It has a vast collection of fanfictions, and there's a good chance you'll find 'anna and yoh lemon fanfiction' there.
One common theme is the power of their partnership. In many fanfics, they are shown as a force to be reckoned with when they combine their shamanic powers. Another theme is love and loyalty. Their relationship is often explored in terms of how they are loyal to each other despite the challenges they face.