Along Came a Rogue by Anna Harrington

THE WICKEDEST SECRET…
Major Nathaniel Grey is free to bed whomever he wants, whenever he chooses, and that’s exactly how he likes it. His only loyalties are to country and the two friends he served with—brothers he’d do anything for. So when one of them is gravely injured and asking for his little sister, Grey will move heaven and earth to bring her home. He’s greeted not by the gangly girl he remembers, but a stunningly beautiful woman holding a loaded musket. And he’s utterly captivated by her…

IS A SECRET SEDUCTION
Once upon a time, Emily would have loved nothing more than a stolen hour with her brother’s best friend, the dashing officer who captured her heart and soul. But things are different now—and so is she. Gone is the eager young woman who believed in love. In her place is a widow weighed down with secrets who desperately needs to disappear before they’re revealed. But Grey’s sinfully sexy smile offers protection unlike anything she’s ever known, tempting her to risk everything . . . even her heart.