Feral Longing by Stephanie Storm

She’s his best friend’s girl. His to protect. And his worst nightmare.
Alex hides a secret the underworld would kill to possess. So when assassins attack the vampire who’s protected her since she was a child, she finds herself claimed by his best friend. Too bad her new guardian is a sexy-as-sin vampire who despises her entire species.

Jericho is devastated when his mentor’s last request ties him to an enticing abomination. Because of the oath he swore to enforce Council law, he’s torn between following the rules and honoring his mentor’s final wish. Somehow, Jericho must find a way to keep Alex safe, even if it means denying his own hungers.

With the underworld on the verge of civil war, Alex is blackmailed into using her gift to unmask the head of the emerging rebellion. As the vampire clan leader’s second, Jericho will have to walk a fine line between his responsibilities and the unregistered faerie he swore to protect.