She moved a little higher and her hot womb fumbled with the tip of her brother's cock. Peter groaned with pleasure and made an instinctive lunge with his hips forward. Riley, as if assuming it, lifted herself up a little, leaving only light contact. Then she shuddered a little, and the delicate veils of her conch lightly massaged his acorn. Peter could go crazy, how nice it was. “Not yet Pete,” Riley whispered, resting her hands on the sides of his head…