Your mine you'll always be mine is what rang through Zim's head he was currently hiding from his leaders but it was next to impossible as they were living with him
[M/N] or Smeetary worker [M/N] is sent down to earth with Zim, he was the one that raised Zim after all so it's technically his fault for how Zim is. That was his punishment, not that he minded.
His favorite Smeet has always been Zim, despite his loud personality.