Her last breath

What if doctors told you you only had a number of breaths before your last one?
It happened to Harper Johnston on a brisk fall day in late September. Only a couple of weeks until her 18th birthday. She had gotten into a good college close to home and her best friend.
What if your best friend thought you deserved infinite breathes?
Ashton saw the world when he looks at her but he won't ever tell anyone.
What happens when love and science are put up against each other?