Rule 34 Dev - animal_genitalia animal_penis equine_genitalia equine_penis eunuch feral genital_focus genital_shot genitals half-erect male penis penis_shot quadruped realistic_feral sheath solo darkmare equid equine horse mammal equine_sheath 4:5 graphite_(artwork) greyscale hi_res monochrome traditional_media_(artwork)|20546114610