In the quiet of their shared bedroom, Brazilian teens Ana and Bia find themselves drawn together, their curiosity piqued by the taboo. Ana, the older sister, is a 'gostosa' - a term of affection and admiration for her curves - while Bia is a 'novinha', a young, fresh-faced beauty. They start tentatively, sharing secrets and touching hands, their hearts pounding in sync. Ana, emboldened, guides Bia's hand to her breast, and the novinha gasps at the sensation. They explore each other's bodies, their soft moans filling the room as they succumb to their sisterly lust.