Taken By His Demon by Lilo Quie

Abaddon isn’t ready for a mate. His touch alone gives partners immense pain, and his heart has yet to melt for another. But when he solves the puzzle of an ancient box and finds his prize inside, he’s delighted to find someone that can handle him for all he is, pain and all. Just in time, too, for danger is coming and Xander’s rise to power is imminent.
Arwyn is an oracle, mind stuck bearing the weight of the past, present, and future. He has fallen in love with Abaddon in so many ways, and has known him since his birth and until his death. Can Arwyn keep his mind in the present long enough to truly love his mate for who he is?