In a dimly lit room, siblings Vítor and Maria face each other, eyes filled with nervous anticipation. 'Pai' ordered this verification, a test of their virtue. Maria, her breath hitching, reaches under her modest dress, showing Vítor her untouched panties. He swallows hard, his own excitement evident. They progress through the ritual, Maria's innocence confirmed with each item ticked off. Yet, their bodies betray them, responding to the taboo proximity, the forbidden intimacy. As Maria's fingers graze Vítor's throbbing erection through his jeans, they realize their verification has taken a sinful turn.