TFA: Fuck her ass

You enter her ass, without thinking about it twice. Its tighter than her pussy, and much tighter than a human ass, and for second you fear that you will break your penis or rip her ass. But you get in, and the feeling you get from it is incredible. She reacts with a primal scream and you start fucking her. Faster and faster you enter into her ass, until you finally cum in her. Just seconds after she cums too, and immediately falls asleep. It almost seems as if its a biological need for her, after sex, not just a sign of exhaustion. You don't know what to do with yourself now.