Ok, I'm only going to teach this once. Next time you are about to climax, firmly grasp the back side of her head, as if you were palming a basketball, and do a slight pelvic thrust forward. Be sure to hold that position until you finish though, or you will have a mess on your hands. Should solve any issues.

*Any girgling, hacking, coughing or gagging noises are just the sound of success.