In a sweltering Brazilian apartment, stepsiblings Amelia and Isabella invite their exotic friend Robert over. As the sun sets, their innocent games of cards turn into heated glances and accidental touches. Isabella's mom, unaware of the tension, joins them, pouring wine. The atmosphere thickens as Robert's hand grazes Amelia's thigh. Isabella watches, her heart pounding, as Robert leans in to kiss Amelia. Their lips meet, and Isabella can't help but imagine her friend's tongue exploring her own mouth. Her mom's presence only fuels their arousal, and soon, the three are entwined in a passionate, taboo threesome.