2boys ao_no_exorcist bangs belt black_coat black_footwear black_hair black_jacket black_pants blue_eyes boots brothers buttons chain closed_mouth coat collar commentary_request demon_tail full_body glasses gun handgun holding holding_gun holding_sword holding_weapon jacket katana long_sleeves looking_at_another male_focus multiple_boys necktie okada_(kotatsu_tako) okumura_rin okumura_yukio pants pointy_ears red_background red_footwear shoelaces short_hair siblings simple_background striped striped_necktie sword tail twins upside-down weapon