My Fair Traitor (Paranormal Misfits) (Volume 2) by C.J Anaya

It's not everyday a girl gets married to a faerie prince of the Seelie Court. After swearing their love and loyalty to one another, Jareth is bound and determined to teach Crysta all she must learn to become queen of the Unseelie Court. But when Crysta and Jareth are attacked in the human realm, a journey to the Fae realm is put into play earlier than planned. Their hopes for marriage and a happily ever after are thwarted when their bonding fails and attempts on Crysta's life continue. That's not all they have to worry about. A magical plague has permeated the land, causing Fae everywhere to weaken and die, solidifying King Moridan's objections to their union. Jareth and Crysta must fight for their right to love each other in a world full of beings who believe their fated mate bond is a threat to the Fae realm and every faerie who inhabits it. Is their love preordained or poisonous? There's only one way to find out.