How does a woman who asks you to be his brother become his girlfriend?

If a woman treats you as a big brother, it means that you are very righteous. Change her impression of you quietly. It's great to be an older brother, but how do you add "love" in front of older brother? Be more romantic and happy when you're with her, just make her feel like she can't live without you. Note: Don't be in a hurry, don't let her feel that you are chasing her, that is, be quiet.

I wish you success!