How do i become more than just friends with a girl?

so there is this girl i like and we are really close. i flirt with her as much as i kno how but she thinks of me as a ';big brother';. i dont want to make it too obvious that i like her. i want to be certain she likes me before i make a move. only help me if youve been in this situation before.How do i become more than just friends with a girl?
i wish i knew my friend^.^

help me out here

http://answers.yahoo.com/question/index?鈥?/a>How do i become more than just friends with a girl?
i think that you should be careful dont show that you like her jus flirt with her dont be to obvious ethier

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