Ruri, a housewife who escaped from her abusive husband and lived a precarious life, decided to offer her body to her father, who had a penchant for large breasts, due to financial difficulties… Her father's abnormal 'breast harassment' included itching and bondage, aphrodisiac oils, nipple torture, and frenzied breast-fucking sex… Although confused, Ruri indulged in the unknown pleasure, her rationality crumbling. This is a record of a housewife's transgressions and being dominated by desires called "assistance" and the training of large breasts.