Sinfully Mine by Kathleen Ayers

Andrew Sinclair is not your ordinary rake. He’s a Deadly Sin.
Andrew Sinclair, the dashing, card-playing younger brother of the Earl of Emerson is shocked to find he’s been left an estate by a gentleman he barely remembers.
Not only does Drew detest animals, dirt, and endless fields of barley he hates the country in general. Nor can he fathom why a man he barely remembers would leave him Blackbird Heath. Drew has plans for his future and they don’t include a farm, nor the man’s widow who apparently comes with it. He plans to sell the property as soon as possible.

Hester Black has toiled tirelessly to transform Blackbird Heath into a thriving enterprise. The farm is her home and her sanctuary. After the demise of her elderly husband, a habitual gambler, Hester is shocked by the revelation that the estate she’s poured her heart and soul into doesn’t belong to her. Instead, the new owner of Blackbird Heath is a dandy from London who intends to sell her home. There’s a catch, however; he can’t sell so much as a clump of dirt until Hester vacates the premises.

Which she has no intention of doing.
A fierce clash of wills unfolds as Drew and Hester compete for control of Blackbird Heath all the while fighting their undeniable attraction to each other. But when Drew is attacked, doubt and suspicion make him question everything about their passionate affair.
After all, Hester would do anything for Blackbird Heath.