1girl, blouse, book, breasts, chalkboard, choker, demon_girl, demon_horns, demon_tail, demon_wings, glasses, greyscale, holding, holding_book, horns, indoors, koyuki_(kotatsu358), large_breasts, long_hair, looking_at_viewer, low_wings, monochrome, neckerchief, original, pantyhose, pencil_skirt, podium, pointy_ears, pov, prehensile_tail, shirt, skirt, solo, tail, teacher, wings