Rule 34 Dev - 2boys animal animal_on_shoulder ao_no_exorcist blacky blue_background blush brothers cat fangs koromo_(sentoxstarling) kuro_(ao_no_exorcist) looking_at_viewer male_focus monochrome multiple_boys okumura_rin okumura_yukio open_mouth pointy_ears siblings simple_background sketch surprised sweatdrop|2585035557