The Queen's Weapons - Anne Bishop

They are Warlord Princes, men born to serve and protect. They are the Queen''s Weapons, men born to destroy the Queen''s enemies - no matter what face that enemy wears. Daemonar Yaslana knows how to be bossy yet supportive traits he shares with his father, the Demon Prince, and his uncle, the High Lord of Hell. But when a young Eyrien Queen inflicts an emotional wound, Daemonar''s counterattack brings him under the tutelage of Witch, the Queen whose continued existence is known only to a select few.