Canticle by LaVerne Lewis

She’s a human with a busted ticker. He’s an ancient warlock. The only thing they have in common are birthmarks that flare to the point of pain when they’re together. But fate has other ideas…

Studying abroad despite her advancing heart disease, Leilani Gibson squeezes all the joy she can out of life. Literally bumping into the most handsome guy she’s ever seen while Christmas shopping should be the best thing that’s happened to her in quite some time, but she knows he’ll disappear when he discovers her secret.
Born into a family of Casters, Stellan Kierkegaard lives his life away from the reminder that he alone is the only one un-mated in his coven. When he collides with Leilani at a Montreal mall, his gallant attempt to get her to the hospital when she succumbs to congestive heart failure takes an unexpected turn. Now he’s forced to withhold some secrets of his own.
Stellan poses as Leilani’s fiancé until she gets the medical care she needs, but the more time they spend together, the more intense their feelings become as their birthmarks flare. If Caster prophecy is to be believed, and this reaction is only triggered in true soul mates, they must hide this fact from a trio of zealous Caster royals who have been tricked once.
The Caster couple who bears the foretold birthmark is prophesied to knit dark and light covens to lead the Caster World. Yet how can this be when Leilani is by every indication, mortal? ​