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anal anal_penetration anthro athletic athletic_anthro athletic_male brown_body brown_fur brown_hair canid canine canis dipstick_tail domestic_dog duo exsys floppy_ears fluffy fluffy_tail fox fur grin hair male male/male male_penetrated male_penetrating male_penetrating_male mammal markings penetration penile penile_penetration penis_in_ass sex smile tail tail_markings tongue tongue_out