rule 34 2022 ambiguous gender animal genitalia animal penis asinus balls digital media artwork dominant dominant feral donkey draft mule duo equid equine equine anus equine penis erection eyebrows facesitting fangs feathering feral fluffymare fur genitals gynja skuggamul hair hi res hooves hybrid kelpie looking back looking down lying male mammal mane mule multicolored body multicolored hair on back on bottom on top open mouth penis purple eyes simple background skugga skuggamul submissive submissive feral submissive male tan tail teeth two tone body two tone hair two tone tail white hair white mane 7133271