A stormy night spent alone with her son's tutor - Sato Shiroine JUL-284

The son, aiming for a national university, hired a tutor named Shirane to help him. She was beautiful and gentle, and under her tutelage, his grades improved dramatically. One day, a typhoon was approaching, and the son, who was on a field trip, couldn't come home because the Shinkansen was suspended. That's when Shirane, soaking wet, arrived at their house...