Rule 34 Dev - animal_genitalia animal_penis anthro balls blue_penis canine_genitalia canine_penis erection genitals knot male muscular muscular_anthro muscular_male nude pecs penis solo standing vein white_balls xuan_sirius edan_shepherd canid canine canis domestic_dog german_shepherd herding_dog mammal pastoral_dog colored_sketch sketch|7550534810