Scispry

Wizard of the 80's (A Family of Wizards Book 1) By Aron Lewes

To become a dark wizard, Anshan Hedi must kill five humans. No one ever told him he couldn't target the terminally ill. He to take the lives of people who are already suffering, even if his fellow wizards disapprove.

Hedi meets Amaria, a young cancer patient who draws him into her world. He's supposed to take her life... but what if she takes his heart instead?