In the dimly lit confines of their Portuguese home, two sisters, their faces flushed with desire, fall prey to their carnal urges. The elder, a sultry brunette, is the first to give in, her fingers dipping into her wetness as she fantasizes about her sister's boyfriend. Her sibling, a raven-haired vixen, watches, her breath hitching as she, too, succumbs to the temptation. They strip, their bodies glistening with sweat, as they explore each other's curves, their moans filling the room. Caught in the throes of passion, they're oblivious to the outside world until a creaking floorboard alerts them to an unwanted audience.