There was no grand drama behind Junko and Akiyo's deep dive into lesbian sex. It was simply that the people they happened to find attractive and flirt with were, for Junko, her younger brother's wife, and for Akiyo, her husband's older sister. Since they both lived nearby, meeting up was effortless, which only made them more obsessed with their relationship. This morning, as soon as she saw her husband off to work, Akiyo immediately headed to Junko's house...
