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anthro anus balls big_balls big_penis butt foreskin forest forest_background freckles genitals hair half-erect hebinoashura_(artist)hi_res humanoid_genitalia humanoid_penis jo_(hebinoashura)jungle long_foreskin long_hair lying male mammal monochrome mouse murid murine nature nature_background nude on_back partially_retracted_foreskin penis pinup plant pose rat rodent solo spread_legs spreading tree unretracted_foreskin