rule 34 age difference anal anal sex anthro antoine ribr0t blush blush lines canid canine chinchilla chinchillid clenched teeth closed eyes cross fox digital media artwork duo fox from front position genitals hunched over legs over shoulders legs up looking pleasured lying male malemale male penetrated male penetrating male penetrating male mammal marble fox mating press moan muscular muscular male nude older male on back open mouth penetration penis piercing red fox ribr0t rodent sex simple background size difference submissive submissive male teeth text unnamed character young younger male 7136320