“Isn’t it about time you gave us a grandchild?” My father-in-law’s question left me shaken. Before our family of four took a hot spring trip, he asked me to use the romantic setting to try for a baby and ordered me to abstain for a month. But my wife had no interest in getting pregnant and rejected every advance. Frustrated, I wandered around the inn—only to stumble upon my mother-in-law bathing...