Rule 34 Dev - 2018 5_fingers abs animal_genitalia animal_penis animated anthro canine_penis erection fur furry grey_background greyscale herpestid humanoid_hands knot looking_down male male_only mammal masturbation mongoose monochrome muscular muscular_male navel nude open_mouth penis precum sheath simple_background solo tabuley testicles tongue tongue_out|3178617528