2girls, bare_shoulders, blush, breasts, city_lights, cleavage, comic, covering_mouth, dress, drill_hair, flying_sweatdrops, greyscale, hat, indoors, matara_okina, monochrome, multiple_girls, strapless, strapless_dress, sweatdrop, touhou, warugaki_(sk-ii), window, yakumo_yukari, yuri