For a mature lady, the very fact that she is given in her mouth and cum in the same place is like a balm to her body. She feels that she hasn't lost her attractiveness and competes with her younger girlfriends on an equal footing. And the attention of the males tickles her vagina so much.
You can't put a finger on such an ass - you need a serious bolt here. But the black man went straight for the main thing - he drove her into her asshole like butter. How thoughtful of her. :-)