"It" began with the sudden death of Mom. The younger brother, who could not wean himself, grew up using his sister's boobs as a pacifier for the next 10 years. My younger brother has improved the movement of his tongue when sucking year by year. My sister has become more sensitive year by year, and her nipples, mammary glands, and milk line are awakened as erogenous zones. While recognizing that it was an abnormal daily life, the older sister with "buggy motherhood" and the younger brother who had "crazy development" could not break the distorted relationship and were absorbed in building an even more awkward incestuous relationship.