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abs alpha0 animal_genitalia anthro balls bdsm biceps black_balls black_hair black_sheath bondage bound bucephalus chain chained chained_to_wall equid equine equine_balls equine_genitalia fully_sheathed genitals hair hi_res horse looking_at_viewer male mammal muscular muscular_anthro muscular_male nipples nude pecs sheath solo stone_wall thick_thighs wall_(structure)