Demon’s Possession by Adrian Wolfe

Being in love means making the ultimate sacrifice.

Layla might be Hunter’s mate… but trusting him completely still proves to be a challenge. Layla finds she’s more or less barely existing among her coven, despite Hunter’s attempts to pull her out of it.
But when the head of Layla’s coven falls sick with a disease from the Underworld, Layla must find a cure, or risk losing one of the most powerful witches alive. Hunter and Layla journey to the Underworld, yet Hunter finds that it is vastly different from the place he left.

Finding an antidote will be a nearly impossible task— and, quite possibly, a deadly one.
Nothing is as it seems. The cure lies hidden with one who is not as she appears. Layla’s past will return to haunt her future, and the fate of the coven rests on her shoulders.
The journey will either bring Layla and Hunter closer than ever… or drive them apart for good.