He knew what she meant. They weren't driving toward an orgasm. He wasn't trying, as he had earlier, to avoid cumming prematurely. His sister had made what could have been an embarrassing situation into something wonderful and memorable - then she had eagerly mated with him until they both had sated each other.

"I want to try something different," she said as she pushed against his chest. "You're getting heavy."

Jackson got off of her as she lay down on her side. "Spoon me," she said.

He lay down behind her as she reached back, grasping his wet, swollen cock, and pulled it toward her pussy. He got the idea...