someone who you can talk to about anything and they wont tell a soul, someone you do the most craziest things with, someone who cares about you more than anything, someone who you can talk to for hours on end and still need to talk to them after, someone who you can call a sister.
person 1: see that girl over there
person 2: yeah i know her
person 1: yeah shes my sister
person 2: your not related though
person 1: well shes my best friend but she is more like a sister