The Big ImageBoard (TBIB) - all fours anal anal penetration animal genitalia animal penis anthro anthro on anthro anthro penetrated anthro penetrating anthro penetrating anthro balls black body black fur border brown body brown fur canid canine penis doggystyle duo erection from behind position fur genitals glistening glistening eyes green eyes grey body grey fur head tuft kneeling knot male male/male male penetrated male penetrating male penetrating male mammal narrowed eyes nude penetration penile penile penetration penis penis in ass red penis sex signature simple background tail grab tan balls tan body tan fur three-quarter view tuft white body white border white fur yookie