Driven Lynn Madison transforms from corporate drone to seductress when her friends issue the Cougar Challenge. Her conquest? A stranger at an airport, sexy rally car driver Sebastian Fiori-who spots Lynn's decadent ménage novel and decides to take her for the ride of a lifetime-with his navigator Mark. Shifting Gears Mark envies his friend Sebastian and Lynn, the cougar who tamed him. When Lynn notices the chemistry between Mark and her friend Sloan, she issues the Cougar Challenge. Sloan expected fantastic sex. But she never imagined her relationship with Mark would empower him to explore the sexual tension between him and Bastian. Four friends, two couples, one night none of them will forget. Reader Advisory: This book contains a steamy f/m/m/f ménage.