His Duchess Trapped in Silk by Patricia Haverton

A love so true and dangerous…

If there is one thing her parents taught her, that is to be dutiful. So when they announce that she is to marry a man she’s never met, Lady Emelia Goldstone is prepared to do what she must.
Reuben Windsoar, youngest son of the Duke of Deepflayer, never thought he’d have to return to the family that deemed him a failure. When news of his father’s passing draws him back to England, he didn’t expect the catastrophe that’d follow. Or that he’d fall in love with his estranged older brother’s intended.
Burdened by their reality but unable to stay away from each other, Emelia and Reuben teeter on the edge of ruination. And what finally pushes them over the edge is a single sentence written on old parchment: “He is your son.”