Rule 34 Dev - 2boys ao_no_exorcist black_hair blacky blue_eyes book brothers cat coal_tar copyright_name demon fangs glasses highres hobgoblin hobgoblin_(ao_no_exorcist) looking_at_viewer looking_back mole multiple_boys necktie okumura_rin okumura_yukio open_mouth pointy_ears siblings simple_background tagme tail white_background|2599240527