A Cowboy's Temptation (Harlequin Desire\Colorado Cattle Barons)

In this Colorado Cattle Barons novel by USA TODAY bestselling author Barbara Dunlop, a cowboy seduces the enemy 

Mayor Seth Jacobs has plans, and he won't let do-gooder Darby Carroll ruin them. Her need for peace and quiet is standing in the way of a crucial railroad project. Now he must put his cowboy charms to good use and persuade Darby to see things his way. But seduction is a two-way street, and Seth soon realizes he underestimated his opponent. Now that he's caught in his own trap, his desire for this woman could be his downfall….