Rule 34 Dev - 2boys animal animal_on_head ao_no_exorcist blush cat cat_teaser collared_shirt fang glasses greyscale highres holding holding_cat_teaser hug lapels looking_at_viewer male_focus monochrome multiple_boys necktie notched_lapels okumura_rin okumura_yukio on_head pants pointy_ears rives school_uniform shirt short_hair standing|23681634561