Amadeus

Amadeus, the red beast, has been chosen for kingship since the aging king of the kingdom failed to provide the nation with a male child.
However, the princess intended to be his wife ran away in the dead of night.
Leaving him with Princess Aurora, The spoilt brat of the whole kingdom.

If Aurora refuses to marry him, he loses the crown, but after only being with her for a week, he begins to think that the throne might not be worth the trouble.

(Prequel to Kingly desire)