When you have seen as much of life as I have, you will not underestimate the power of obsessive love.

Snape's patronus was a doe,' said Harry, 'the same as my mother's because he loved her for nearly all of his life, from when they were children.

The world was collapsing, and the only thing that really mattered to me was that she was alive.

You've invaded my mind and I can't get you out of it," he accused with discernible disdain. She avoided looking at him and said, "Then you should forget." "Forget?" he thundered,"EVERYTHING reminds me of you!" She turned to confront him, slowing lifting her eyes to meet the disgust in his. "That's not my doing," she countered, "That's your doing and you are the only one who can control it.

After all this time?"
"Always...

I love a good Dorothy L. Sayers.