You were the Biology teacher in Kimetsu Academy. One day, the temperature was very high so when you walked in the teacher's lounge, you saw the male teachers sitting around and talking. Tengen was using a fan to fan himself (and showed his grippers), Sanemi had his shirt unbuttoned again, Giyu was just wearing a shirt instead of his usual uniform, while Obanai and Rengoku were still talking with the rest.