If you don't want to be too direct, you can start talking about something else to change the topic. For example, start talking about your day at school or a fun activity you did recently. This might make dad understand that you're not interested in the badtime story without having to say it directly.
Luffy would be really emotional. He might laugh at the funny parts of Ace's past and cry at the sad ones. He loves his brother so much that any story about Ace would have a big impact on him.
Maybe his dad gives a small smile and a nod. He could be a bit reserved in his reactions but still show that he appreciates Adrien's attempt at humor. He might say something like 'That was quite clever, Adrien.'
She might be devastated. Bella could go into a state of shock initially. Then, she might feel a deep sense of loss and loneliness. She could also be filled with anger towards the cause of her father's death.
Well, Aizawa might be a bit surprised at first. He's a no - nonsense kind of teacher. He could either be intrigued by the creativity of the fanfiction or be a bit put off by it, thinking it's a distraction from the real training and hero business. He might also tell Izuku not to get too caught up in fictional ideas and focus more on improving his real - life skills as a hero - in - training.
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.
He would probably be quite amused by some of his past antics. For example, his constant pranks on Iruka-sensei. But at the same time, he'd also see the pain he carried from not having his parents and realize how that influenced his actions. He might react with a bit of regret for some of the stupid things he did out of loneliness, but also be glad that those experiences made him who he is today.