Tome, a devout young man, is tormented by his carnal desires for his sister, Ines. The mere sight of her luscious curves sends shivers down his spine, and her innocent touches set his body ablaze. Ines, oblivious to her brother's torment, continues to tease him mercilessly, her laughter echoing like a siren's song in Tome's ears. One day, as they're alone in the house, Ines playfully pins Tome down, her breasts pressing against his chest. Tome's control snaps, and he seizes her lips in a passionate, punishing kiss, marking the beginning of their descent into taboo pleasure.