Roll her over.

Luckily for you she stiffens and collapses on top of you, cumming before she could push you over the point of no return. For a moment you enjoy the softness of her warm flesh against your chest before you recoup enough energy to roll her over on to her back with your cock still deeply embedded in her.

"My God, I've never had anyone last so long!" Alex grins as she parts her thighs apart for you.

Hovering over her, you place your hands at her sides to allow you the optimum view of her beautiful face and huge, firm tits slightly lolled to her sides as you begin to thrust in and out of her. She closes her eyes and bites her lower lip, trying to suppress her moans as her pussy takes a pounding.

"Ooooh God," she cries out, grabbing hold of her flailing tits while your cock churning violently in and out of her cunt. She wraps her legs around your waist, feebly trying to slow down your thrusts but instead it spurns you to pummel her pussy even more mercilessly, bringing her to one orgasm after another.

You lose track of time and you are sure at this point Alex does not care if you fuck her for a couple hours if you keep making her cum. But you are sure you have enough time and energy to fuck her in a couple other positions.