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anal animal_genitalia anthro anthro_on_anthro anus backsack balls belly big_balls blushing_yokai canid canine canis claws collar collar_only digitigrade domestic_dog duo faceless_anthro faceless_character faceless_male genitals guide_lines licking lying male male/male male_anthro mammal nude nude_anthro nude_male on_front open_mouth oral pawpads paws perineum perineum_grab rear_view rimming saggy_balls semi-anthro sex sheath short_tail simple_background sketch submissive submissive_anthro submissive_male tail tail_anus thick_thighs tobias_weatherby toe_claws tongue tongue_out yellow_background