daveyboy, she doesn't have to like her as being played with for you to do it and her to enjoy it. Don't go straight for the penetration of the ass. With her on top, reach around her hips and pull on an ass cheek to distort the anus. Gradually get closer until you can touch it. Message it and rub it for a while, then start pressing further and further until you can penetrate it without bringing on the heat from her. Don't do more that one of these progressive steps in a night, let her get used to it before you proceed. Then send me a tape of you working her ass like a locomotive.