He should first realize that a gay story is just like any other story about people's lives. He could try to understand the feelings and experiences of the gay characters in the story. Maybe he could even learn something new about love and acceptance. If he has any questions or misunderstandings, he could do some research or talk to people who are more knowledgeable about the gay community.
Well, it really depends on your own beliefs and values, but in a modern and inclusive society, the best thing is to be accepting. If your friends share this story, it might be a sign of trust. Don't make them feel ashamed or wrong. Instead, you could share positive stories or experiences about LGBTQ+ acceptance that you've heard. This can help create a more positive and inclusive environment for them.
Mom was shocked at first. She felt betrayed in a way because he had entered into a relationship with her while being gay. She was also angry that he hadn't been honest with her from the start.
First, study their characters. Know their personalities, backstories, and how they interact in the original story. For example, Shinobu is often calm but has a hidden fierceness, and Giyuu is a bit of a loner. Then, come up with an interesting plot. It could be about them going on a joint mission where they face a new type of demon. Keep in mind their relationship dynamics as you write.
There are fanfictions where Shinobu and Giyuu are paired in a post - demon - slaying world. For example, they might start a new life together, perhaps helping to rebuild the demon - slayer corps in a different way. Shinobu's medical knowledge and Giyuu's combat skills could be combined in interesting ways in these stories.