This one is from one of my very favorite bands, a little Canadian group named Stars. I saw them in Boston once upon a time and they were magical.
The song is a great lyrical arguement for monogamy. As fun as it is to have sparks and first kisses and go through learning a new person, it's actually incredibly hot to have someone in your life is already there:
I know your face
all the ways you move
you come in, I can read you
you're my favourite book
A boy who was not even interested in me once figured out the patterns of the way I laugh and I'll confess, there was something very sweet about being figured out. Even for something as silly as octaves in a giggle.
Give it a listen.
My Favourite Book