Zach will be able to hear what they are whispering, but he is happy, so he doesn't care.
Logan will nod. "Don't ask Clary either. She'll get all gushy and hyper." 

Yeah totally just shy. Nowhere near as stubborn as Bb and Lo.

Azrael must be very sneaky to get away everytime he almost gets in a fight with Lucifer. Yeah very very unwise.