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2017 anthro balls black_body black_fur claws elderly flaccid foreskin fur genitals humanoid_genitalia humanoid_penis izrez leash leashed_viewer looking_at_viewer low-angle_view male mammal mature_male murid murine muscular muscular_anthro muscular_male nude penis prison rat red_eyes rodent saggy_balls scar short_story solo story story_in_description vein whiskers