FURVERT!

4_toes abstract_background animal_genitalia animal_penis anthro anus biped blue_body blue_fur butt canine_genitalia canine_penis claws digital_media_(artwork)digitigrade erection feet felid foot_focus fur genitals hindpaw knot lying male mammal nude on_back one_eye_closed open_mouth pawpads paws penis presenting presenting_hindquarters red_eyes simple_background soles solo spots spread_legs spreading tail taintedstar toes vein