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2017 4:3 ambiguous_penetration anthro bent_over bodily_fluids butt canid canine canis clenched_teeth cum detailed_background domestic_dog duo erection eyes_closed female female_penetrated from_behind_position genital_fluids genitals hand_on_butt krells male male/female male_penetrating male_penetrating_female mammal open_mouth penetration penis raised_tail sex tail teeth