It all started with their mother's sudden death. For the next 10 years, the younger brother, unable to stop breastfeeding, grew up using his older sister's breast as a pacifier. With each passing year, the younger brother's tongue movements while sucking improved. The older sister became more sensitive with each passing year, awakening her nipples, mammary glands, and milk lines as erogenous zones. Though aware that this was an abnormal daily routine, the older sister with her "faulty maternal instinct" and the younger brother with his "crazy development" were unable to break away from this twisted relationship, and became obsessed with building an even more twisted incestuous relationship...