it's not like love at first sight, really. 
It's more like...gravity moves. When you see her,
suddenly it's not the earth holding you here anymore.
She does. And nothing matters more than her.
And you would do anything for her, be anything
for her...You become whatever she needs you to
be, whether that's a protector, or a lover, or a
friend, or a brother.

- Jacob Black.
[ Eclipse, Chapter 8, p.176 ]