A young stepmother, a hot-blooded stepson, and a road with no turning back. In the cramped cabin, the daytime still holds their mother-and-son roles—but at night, only body heat and breath remain. From the first tentative probing and avoidance to later drawing close on their own and taking from each other. Sweat, dust, the vibration of the engine—all become the background music of desire. The farther they drive, the blurrier the line of morality becomes, until it is completely crushed beneath the tires.