Tanjiro and Kanao's love is a slow - burning and sweet one. They first meet as comrades in the fight against demons. Tanjiro's kind heart and strong will gradually draw Kanao out of her shell. Kanao, who was initially rather reserved, starts to open up more because of Tanjiro. Their relationship develops as they face numerous challenges together, and their mutual respect and growing affection for each other are heartwarming to watch in the series.
Their relationship can be further explored by focusing on their non - verbal communication. Since Nezuko can't speak much as a demon, the looks they exchange, the way Tanjiro gently touches her head to reassure her, these small gestures can be delved into. For example, in a dangerous situation, Tanjiro's glance at Nezuko could convey a whole world of trust and protection.
A great plot idea could be that Nezuko develops a new power that only works when she and Tanjiro are in close proximity. This power could be crucial in fighting a powerful upper - rank demon. For example, she might be able to create a protective shield around them both. Another could be a fanfiction where Tanjiro and Nezuko are invited to a demon slayer gathering in a far - off land. There, they meet other slayers from different regions and learn new techniques. Along the way, they also have to deal with some demons who are trying to infiltrate the gathering.
One interesting 'demon slayer reaction fanfiction' could be about the characters' reactions to modern technology. For example, Tanjiro might be amazed by a smartphone and its functions. Another could be their reactions to different types of food from our world. They might find pizza or ice cream very strange but delicious.
First, know the characters well. Understand their personalities, like Tanjiro's kindness and determination. Then, think of an interesting situation for them to react to, such as meeting a powerful new demon. Keep their reactions in line with who they are. For example, Zenitsu would probably be scared at first but then find some courage.