1boy, bad_pixiv_id, bara, between_pectorals, bursting_pectorals, flying_button, glasses, greyscale, hand_up, kekkai_sensen, klaus_von_reinhertz, large_pectorals, long_sideburns, looking_at_chest, looking_at_pectorals, male_focus, mature_male, monochrome, muscular, muscular_male, mutton_chops, necktie, necktie_between_pectorals, nipples, nore_(boosuke), pectoral_focus, pectorals, semi-rimless_eyewear, short_hair, sideburns, sketch, solo, sweatdrop, tusks, upper_body, wardrobe_malfunction