1girl, arm_under_breasts, ass, bare_shoulders, bikini, blush, breasts, cleavage, collarbone, comiket, doodles, embarrassed, gokubuto_mayuge, greyscale, hand_up, idolmaster, idolmaster_cinderella_girls, large_breasts, long_hair, looking_away, lying, monochrome, mukai_takumi, on_stomach, simple_background, sketch, string_bikini, sweat, swimsuit, wet, white_background