The Proper Wife (Wellingfords #2)
Julia Justiss

A more unsuitable wife St. John Sandiford found impossible to imagine! Why then couldn't he get Clarissa out of his mind -- or his heart?
Though Sinjin Sandiford was rightly called "hero," he could sometimes fall short of "gentleman," Lady Beaumont fumed. Why, the cad had refused her help in making an advantageous match -- yet still he managed to stir the most unseemly feelings within her....