I succeeded in relaxing my anal muscles enough for her to stick her index finger in and past the sphincter muscles so that her finger was probing my colon until she found the position of my prostrate and pressed down on it gently through the thin membrane, she now took more cock into her mouth until I could feel her chin on my balls and using her free hand she pulled me in and pushed me half way out of her mouth, I got the idea and begun to fuck her mouth and throat slowly and then, when I knew I was reaching the point of explosion, quickly not wanting...