Then she was behind him, arms wrapped around him and cheek pressed to his back and he shot into the air as hard as he could and was rewarded with a gasp of exhilarated laughter.   Her grip tightened when he picked up speed and he could feel her excitement as he raced along.  It soaked through a shirt surely too thin for this type of speed and warmed him.  "You're a  daredevil," he said.