In the steamy, tropical heat of Brazil, two curious siblings explore their burgeoning desires. Alone in their cramped apartment, they tentatively touch, their bodies already flushed with arousal. The sister, a naughty teen with a wicked glint in her eye, takes the lead, guiding her brother's hand to her damp panties. They stumble through their first fumbling encounters, their breath ragged, hearts pounding, as they give in to their taboo urges.