A Common Life by Shawna Canon

War Mage Cassan's purpose in life is to serve his queen, the woman who plucked him from the ashes of his home and saved him from his own magic.
Unfortunately for Cassan, today serving his queen means playing bodyguard to her romantic son. When they set out to fetch Monrose's intended bride for the queen's inspection, Cassan doesn't expect much danger. He certainly doesn't expect Monrose to insist they save his would-be father-in-law from a deadly creature of dark magic.
But Monrose is his prince and orders are orders, even if they come from a foolish dreamer with an inadequate sense of self-preservation.