2020 abs absurd_res animal_genitalia animal_penis anthro balls bdsm biceps big_balls big_penis black_hair bondage bound crouching dreamworks equid equine equine_penis erection fur genitals grass hair hi_res horse male mammal medial_ring muscular muscular_anthro muscular_male nipples nude outside pecs penis penis_bondage quads red_eyes rope rope_bondage solo spirit:_stallion_of_the_cimarron spirit_(cimarron) stake tan_body tan_fur triceps zourik