When he was a child, he regarded her as his sister, but after his mother committed suicide, he no longer wanted to have anything to do with her.
As a child, she enjoyed being his sister, but as she grew older, she found herself becoming more and more attached to him.
When he was a child, he bullied her and didn't like her. Later, she became more and more beautiful and moved further and further away from him.
Like writing a running account.