Half-man, half-horse, all chest! YOU'RE WELCOME!
Mystery Stallion (Horsemen #7) by Kate Hill
Long ago, a striped Horseman lost his heart to the only Horsewoman ever born. Feared and rejected, he allowed his bitterness to destroy them both. Since then, no striped Horseman has ever known love...until now.
Sold into slavery by his father, Grigori de Forest arrives home twenty years later to reclaim his birthright. Now lord of a land where superstitious villagers despise and fear him because he bears "the marks," he intends to live alone in his family's ancestral castle.
Since childhood, Violeta has been fascinated by the mysterious Grigori, whose striped coat sets him apart from other Horsemen. Desperate for work and knowing he has run off all his servants, she requests he hire her to cook and clean. She doesn't realize that he remembers her for an act of kindness toward him years ago.
Lust spurred on by shared dreams hurls them into a storm of passion, but their love and lives are endangered by the villagers, and a plague that threatens to destroy the mighty race of Horsemen.