Seduced by the Dandy Lion by Suzanne Quill

Forced into an arranged marriage, Marianne, a slightly plump and plain daughter of a social-climbing merchant, and Andrew, the recognized fop of the ton and son of a constantly beguiled earl, have little more in common than the spark that happens when their fingertips touch. But they will do their duty for their respective families.
When Andrew disappears and is pressed into service on a merchant vessel, Marianne must fend for herself as her condescending, disrespectful father-in-law kicks her out of the family townhouse and hounds her to relinquish her dowry.
But what happens four years later when Andrew returns looking and acting nothing like the fop he was only to discover his now beautiful, self-sufficient wife is being courted by a new suitor?