rule 34 2020 anthro anus ass backsack balls biped black nose blue body blue fur blue hair canid canine claws curled tail digital media artwork erection eyewear fur genitals glasses hair heart hi res leg markings looking at viewer looking back male male only mammal markings multicolored body multicolored fur nude pawpads penis presenting presenting anus presenting hindquarters seth iova simple background smile socks marking solo toes two tone body two tone fur white body white fur 4039131