JUR-184 Would you dislike it if your first partner were older? Her older sister, a married woman, secretly teases my casual lover’s boyfriend and trains him to suit her tastes, indulging in an affair with repeated secret encounters. Mariko Sada

I became the boyfriend of Saeko, a senior coworker from my part-time job, but maybe because she didn’t like that I was inexperienced, she wouldn’t get intimate with me at all. So I tried a matching app, and the person I met there was Saeko’s older sister, Mariko. With her husband working overseas, she seemed frustrated and unsatisfied, and our secret relationship began on the condition that we keep it hidden from everyone. Unlike Saeko, Mariko would let me go all the way, and being with her felt so good it was almost enough to melt both body and mind. And our desires kept growing stronger, leading us to secretly meet at home too.