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1:1 animal_genitalia animal_penis anthro balls biped black_penis bodily_fluids brolaren equid equine equine_genitalia equine_penis genitals half-erect hi_res hooves horse male mammal markings muscular muscular_anthro muscular_male nipple_piercing nipples nude penis piercing pubes sitting solo spread_legs spreading sweat tattoo thunder_blackrain