There could be. Fanfiction often explores different scenarios and relationships. But it can be a bit difficult to find as it depends on the popularity of the characters Tomoe and Nanami in the fanfiction community. You may need to search through multiple fanfiction websites like Archive of Our Own or FanFiction.net to see if such a story exists.
One possible scenario in such a fanfiction could be Nanami and Tomoe going on a journey to the spirit world together. They might face various challenges there, like dealing with mischievous spirits. Tomoe, with his powerful yokai abilities, would protect Nanami throughout the adventure. And Nanami, with her kind heart, could end up making friends with some of the spirits they encounter.
In a Tomoe x Nanami fanfiction, it would be interesting to write about a situation where they have to pretend to be a married couple for some spirit - world related reason. They would have to deal with all the implications of that, like sharing living quarters and acting affectionate in public. This would force them to confront their true feelings for each other.
A possible fanfiction plot could be Nanami accidentally loses her powers and Tomoe has to protect her while also trying to find a way to restore her powers. In the process, they discover new things about each other and their feelings grow stronger. It could be a story full of action, a bit of angst, and a lot of tender moments.
I'm not sure specifically as I haven't read that particular fanfic. But generally, it might involve their relationship, adventures they go on together, and how they interact in the fictional world created by the fanfic writer.
One common theme is friendship. Their bond is often explored, like how they support each other through difficult times. Another theme is adventure. Many fanfics send them on quests or travels to different places.
Well, transformation is also a theme. Nanami's growth as a character and how Tomoe adapts to it is often part of the stories. Also, the theme of loyalty is quite prominent. They are always there for each other, no matter what. In addition, the cultural elements of their world are often explored, like the Japanese mythology that surrounds them.
In the fanfiction, perhaps the arrival of the baby changes the relationship between Tomoe and Nanami. They become more united as they focus on raising their child. Tomoe, who was once more aloof, becomes a very protective father, and Nanami is a loving and gentle mother.
One great fanfiction idea could be that Nanami and Tomoe go on a journey to the spirit world to solve a mystery that threatens the human world. Along the way, they face various challenges that test their relationship and their individual powers.
In many tomoe x nanami fanfics, the cultural elements related to their backgrounds are incorporated. This adds depth to the story. For instance, if they are from different cultural settings in the original work, the fanfic might explore how they bridge those gaps in their relationship. Another characteristic is the exploration of their emotional connection. Fanfic writers often delve deep into how they feel for each other, whether it's love, respect or a combination of both. It's not just about the romantic aspect but also about their friendship and mutual understanding.