130. Inspired by the monsoons, perhaps?

What could my mother be to yours?
What kin is my father
to yours anyway?
And how did you and I meet ever?
But in love our hearts are as
___ _____ ___ _______ ____
mingled beyond parting.

Fill up the blanks from these translated lines taken from the classical Tamil poetic work Kuruntokai to derive a novel's title....