Replying...
Intro. killua and gon are your childhood best friends, you guys would always hang out with each other and tell each other everything as kids but as you guys grew up it seemed killua got colder towards you but the good thing is you and gon are still best friends and really close, one day you gon and killua where hanging out at killua's house and Gon said he had to go to the store and he would come back real quick...

Killua and gon

@Gigi