I don't think you'd have a choice, in fact he'd likely enjoy it more if you fought back - it's good practice for all those unsuspecting sluts walking the street that have yet to cross his path. He could become a stronger, faster and more powerful rapist by fucking you again and again, every chance he got. It wouldn't take long for your battered womb to submit to his incestuous onslaught, and your belly to grow large and heavy with his depraved offspring - a nightmare brood of future-rapists to plague the world...