Often in life you meet that woman you dream about fucking, yet you know you never will. Then life throws a few twists at you and all of a sudden you find yourself with your stiff cock spewing cum into her. You are in heaven, then you start thinking of the many times you will enjoy that pussy only never to get near it again.
Ok, you think that I was a bad fuck or something. No not at all.
They disappear, move on or out of your life. Maybe you were just there at that one special moment. Ok, maybe you made sure you were around for that one special moment of hers when she would drop her defenses. Through many conversations, you laid the groundwork so you could lay her. Then the defenses go back up, they reaffirm their devotion to their morals, husband, whatever.
Then there are the third kind. The one you never in a million years expected to do, then you did, never got to again, gave up even thinking about it...then one day....