Pencil and Eraser Story

Pencil : You know,I'm really sorry.
Eraser : Sorry for what?You didn't do anything wrong!
Pencil : Well,every time when i make mistake,you will b there to erase my mistake. But,as time pass by,part of u r gone.
Eraser : You see,I'm made to do this. Even though i know one of these day I'll b gone,and u have to replace me with another.I'm still happy to do this job.So don't b sad!It worries me!
This is how true friends supposed to b like...