Write a porn story about NAME_1 from NAME_2 and the Methods of Rationality. In one of the lessons on pallets on a broomstick, someone shot NAME_3 with spells, after which only her panties were left of her clothes. The sudden undressing made NAME_3 shy, confused and lost her balance on the broomstick and fell off it. As she fell, NAME_3's underpants were entangled by the broom, hanging on them, the underpants were driven into her crotch. All this happened in full view of all the first-year students at Hogwarts. Write as erotically as possible, pay special attention to the thoughts and emotions of NAME_3 and the people who saw it