Yui Kawagoe, a married woman and mother of a long-awaited son, was at the peak of her happiness when she decided to visit her husband's parents to show off their child. However, upon arriving home, she encountered something unexpected—her mother-in-law, who had set strict rules for everyone in the family. Feeling uncomfortable and neglected by both her husband and his parents, Yui began expressing herself through breastfeeding, using her abundant milk to soothe her aching breasts. As fate would have it, her father-in-law paid her a visit while she was engaged in this intimate act. He confessed that they were no longer needed in the house and offered her comfort through a special massage involving his own motherly touch...

資産家の夫と結婚して待望の長男を出産ー。幸せの絶頂にいたゆいは夫の両親に我が子を見せるために帰省をする事になった。しかしそこでゆいが目にしたのは川越家全てのルールを決めている義母の姿だった…。夫も義母に言いなりで、居心地の悪さを感じたゆいが母乳でパンパンに張った胸を搾乳していると義父がゆいの元を訪れる。「僕たちはもうこの家では用無しなんだよ。」寂しさから義父の母乳マッサージを受け入れたゆいは…。