Yukari, a beautiful wife with a faithful and gentle personality, loved her husband, Tetsugaku, who was her former colleague, and lived a life of luxury. However, her husband got promoted and became busy at work, and they hadn't planned on having a child for a while. Perhaps it's because she's at an age where her sexual desire is increasing, but recently her body has become a little sensitive, especially her chest area...her nipples have become more sensitive. She would masturbate with her nipples every day in between housework, but one day, her husband's subordinate started to develop her nipples!