In the heat of a humid Brazilian afternoon, a brother and sister, both curious and horny, find themselves alone in the house. The sister, a bold and adventurous 'safada,' seduces her brother, calling herself a 'cachorra' in her sultry voice. She teases him, showing off her body, and soon, their desires overcome their inhibitions. They explore each other's bodies, the brother's hands roaming over his sister's curves, while she guides his cock into her eager, wet pussy.