Ane wa Yanmama Junyuu-chuu

義姉はヤンママ授乳中

This story about a married woman, as is usual in such stories sexually unsatisfied in married life, and decided to make up for lost time with her brother, who came to stay with her husband and children. What started as a harmless joke on a drunken bench, will grow into a constant frenzied sex always and everywhere, at any convenient opportunity.