How to Save a Life (Book Two/The Life Series/Supernatural)

Ness Singer cares about Dean Winchester. She does. But she doesn't want to start anything because he only has a year to live, and next year, he won't be here. Why put herself through more pain than she will be already going through?
But she will do anything it takes to try to save him from Hell, and anything it takes to help Sam stay sane while he looks for ways to save Dean, and anything it takes to protect her dad as much as she can.

(Season 3) (a few episodes.)