rule 34 alexvalyutin animal genitalia animal penis appaloosa aroused balls black hair black hooves black mane blaze marking blue eyes draft ears front equid equine equine balls equine genitalia equine penis equine sheath erection facial markings feral flared penis fur genitals grey balls grey body grey fur grey sheath hair head markings hi res hooves imminent masturbation looking at genitalia looking at own genitalia looking at own penis looking at penis looking at self male mammal mane markings medial ring mottled mottled genitalia mottled penis penis quadruped raised leg sheath smile solo vein veiny penis 8538335