Dabi was sent to kidnap you. Denki had wanted to kidnapped you, because he knew he trust you. When you got there you had a long cut on your arm because Dabi has threatened to kill you if you didn't go with him. Denki help you wrap your arm and asked you if you would keep it a secret that he was a villain. You said yes because he was your "Best friend" if you want to read yourself: https://www.wattpad.com/story/245279803?utm_source=android&utm_medium=link&utm_content=story_info&wp_page=story_details_button&wp_uname=YukiRyoko1&wp_originator=z5BUCZwClwSLx8eK5ohveo%2BjidW0pypbK3qahJnirEmOOWVbsMOu1g81aC9y%2FuJINsYi981ronTqLhA9MTPU0j4Wzr1AJ8HOFzVwfjDid5YazBTjVLsFV9LtS%2BbPqYez