FURVERT!

2010 anatomically_correct anatomically_correct_genitalia anatomically_correct_vulva animal_genitalia animal_penis animal_vulva canid canine canine_genitalia canine_penis canine_vulva canis duo erection female feral feral_on_feral genitals greyscale knot lying male male/female mammal mixxiwuff monochrome multi_tail nude on_back penis simple_background sketch spread_legs spreading tail vulva white_background wolf