One Hell of a Love Story-A Kuroshitsuji Fan Fic

Heather Phantomhive, finally gets adjusted life. But then things get turned around when her parents end up dead, leaving her in charge of the family company. Due to tons of stress, Heather develops Migraine headaches and ends up dozing off at the wheel. At the point of death, she meets a man clothed in shadows claiming to be a demon, offering to help her find the people responsible for her family's death, but in return he wants her soul.