Forbidden to the Duke

The expectations of a duke are simple: 
1. Secure a suitable marriage. 2. Produce male heirs. 
For Rhys Rolleston, Duke of Harling, however, it's not so black-and-white when he catches Bellona Cherroll trespassing on his land. He's captivated by this exotic beauty, but Rhys knows she's the very antithesis of what a "suitable" duchess should be. 
What should he do? Avoid her at all costs. What does he do? Invite her to live under his roof!