One day, a mother discovers her son masturbating. In a fluster, she pulls down his pants and is stunned to see his grown penis standing erect before her. Overcome by shock and sudden desire, she takes the tip into her mouth. Later, while thinking of her son, she picks up a vibrator—but this time, the son takes it from her, and the two spiral into a forbidden relationship. A taboo affair unfolds between mother and son.