My stepmother Nanako, who had been with me to Hokkaido when my father was transferred, came back this summer to check on me. Nanako was as beautiful as ever, and I was in the midst of puberty, so I still couldn't treat her like mother and son. On a hot afternoon, Nanako was hanging out the laundry on the balcony. <Sweat running down her neck> <Overflowing armpit sweat> <Sweat-soaked blouse> I felt an unnatural desire in the lewd sweat running down her whole body, and before I knew it, I started to think of Nanako not as a mother, but as a woman...