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5_fingers animal_genitalia animal_penis anthro balls barrel biceps big_muscles big_penis biped black_body black_fur blue_hair equid equine equine_genitalia equine_penis erection fingers fist flared_penis fur genitals glistening grasp green_hair hair holding_object horse leg_markings long_hair looking_at_viewer male mammal manly markings muscular muscular_anthro muscular_male nipples nude pecs penis pink_penis pose presenting raised_arm shadow sheath simple_background socks_(marking)solo standing teal_eyes thick_penis vein white_nose wood zeta-haru