Loincloth female teacher humiliation

One summer day...In Rei's class, a summer course was being held with only students with poor grades. The temperature in the classroom rose rapidly under the merciless sunlight, and Rei felt uncomfortable in her stuffy pants. That night, Rei holds her husband's loincloth in her hands. ``This seems like it would have good ventilation...'' and the next day, Rei put on a loincloth and worked hard at work. However, Rei feels strange because her lower body is different than usual. She didn't know that the students noticed Rei's strange behavior...