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anal anal_penetration animal_genitalia animal_penis anthro balls blush bodily_fluids canid canine canine_genitalia canine_penis canis disembodied_penis domestic_dog duo erection genital_fluids genitals hotoshuken knot male male/male male_penetrated male_penetrating male_penetrating_male mammal monochrome penetration penis precum sex sheath simple_background sketch solo_focus