Rule 34 Dev - animal_genitalia animal_penis anthro anus backsack balls biped butt dock_(anatomy) equine_genitalia equine_penis erection flared_penis fur genitals hay hooves male medial_ring penis perineal_raphe perineum raised_tail raphe_(anatomy) solo tail tail_anus vein veiny_penis apple-faced luckystallion13 equid equine horse mammal hi_res|22931017130