all_fours anal anal_penetration animal_genitalia balls canine canine_penis claws close-up collar cum cum_in_ass cum_inside cumshot dog doggystyle erection father father_and_son feral feral_on_feral from_behind gay gin ginga_nagareboshi_gin incest knot male mammal metalfox nude open_mouth orgasm parent penetration penis riki scar sex size_difference son tongue weed_(character)