Rui Aiji, a 35-year-old mother, deeply loved her eldest son. One day, she discovered that he had received underwear as a gift from a girl. The shock and jealousy overwhelmed her. Checking the underwear, she realized her son had been wearing something unfamiliar. Torn between maternal pride and feminine desire, emotions surged within her as she clung to her son's crotch, unable to suppress the intense feelings rising in her chest.