FURVERT!

1:1 all_fours anal anthro avian big_butt bodily_fluids border_collie butt canid canine canis collie cum doggystyle domestic_dog duo erection from_behind_position genital_fluids genitals herding_dog hi_res knot male male/male male_penetrated male_penetrating male_penetrating_male mammal orgasm pastoral_dog penetration penis sex sheepdog sirod