Best friend with BTS S1

You (Y/N) are best friend with BTS (They are also best friends with one of your best friend, Marley) and Yoongi is your brother but the maknae line has a crush on you and you don't know. When you finally found out, You have no idea what to do. So you decided to just act normal and just forget about it but you can't. And when the hyungs line found out and wanted to talk to you, it was too late.