Rule 34 Dev - 3:4 animal_genitalia animal_penis backsack balls big_balls black_hair bodily_fluids bucephalus equid equine equine_penis erection feral genital_fluids genitals hair hi_res hooves horse looking_at_viewer male male_only mammal medial_ring nude penis precum precum_on_balls precum_on_penis simple_background smile virtyalfobo|4032753624