Grey

And the line between Black and White blurred. White thought to herself that Black was the most beautiful thing she'd ever seen, and she loved the grey that meant that Black was rubbing off on her.
However, Black didn't seem to understand how totally amazing it was to her that any colour could ever find White so attractive. In White's opinion, all other colours were preferable to being white. Even drab-coloured would be more interesting. And yet Black found her fascinating - even beautiful - which bewildered, puzzled, baffled, and bemused her.
But White was so content just to be close to Black, to hold his beautiful hand, and to trace along his eyebrows, his ears, and his beautiful beautiful lips with her fingers, that she decided not to worry about it any more.