The mother, noticing her son's morning erection, became aroused by his penis. The son, unable to control his sexual desires every day, is captivated by his mother's exposed body and underwear. Aware of each other's sexual urges, they secretly approach each other without the father's knowledge. In places like the bathroom, kitchen, or the futon where the father sleeps in a cross-legged position, their forbidden relationship escalates. The mother, teaching the boy, who is in puberty and has a sensitive penis, how to engage in slow sex to prevent immediate ejaculation, imparts forbidden knowledge about the female body.