FURVERT!

1:1 anal anal_penetration animal_genitalia animal_penis anthro axton balls bareback big_balls big_penis bodily_fluids border_collie canid canine canine_genitalia canine_penis canis collie cum cum_inside domestic_dog duo erection genital_fluids genitals herding_dog hi_res humanoid_genitalia humanoid_penis knot knotted_penis maldu male male/male male_penetrated male_penetrating male_penetrating_male mammal muscular pastoral_dog penetration penis sex sheepdog simple_background