The Phoneix's Mark Book 2: Burn Into Me {Writer's Cramp}

Now married, Laurence and Sarah must face an onslaught of challenges to prove their love for each other is strong enough to keep standing against all odds. They'll fight enemies, new and old, and make new alliances, as well as meet an indigenous race of creatures that call themselves 'The Kin.' But will they be able to overcome these new challenges, and prove to the world that a human-phoenix relationship can survive through thick and thin? Or will their actions only prove to tear them apart?