Rule 34 Dev - anthro average_penis balls biped black_body black_fur crotch_shot erection foreskin frenulum fur genital_shot genitals glans humanoid_genitalia humanoid_penis male navel nude penis penis_shot pubes retracted_foreskin solo standing thick_penis vein veiny_penis anakuro trist mammal mephitid skunk 2013 digital_media_(artwork) sketch|1472806300