Who just want to be your friend as a "big brother"?
They are elder than you and most of time they are married or attached. They never thought of developing any sex-related relationship with you. They just want to be a elder brother to you, always eager to help and instruct you as a senior, sometimes opposite to a girl's willingness. You know males typically tend to provide protects to the weak though they themselves perhaps are not so strong to do that.
The answer to my question is probably no, as you had indicated looking for a bf. I am just curious lah.
BTW, u are definitely in a position capable of help us in improving writing English huh.