In the machine, he had learned a few places that seemed to turn her on more than others. Her breasts were one so he began with those. Her back and shoulder blades were another. He spent a few minutes on her breasts and then quickly flipped her over so he could kiss and lick on her back. His fingertips trailed down her sides and he felt her jerk. He kissed the back of her neck and his tongue stroked its way down to her spine.
He continued stroking her sides with his fingertips as he kissed her shoulder blades and pressed his tongue into her spine, flicking it back and forth. She moaned and her hands were gripping the sheets. Nathaniel found her reactions were getting him hard. She didn't even have to touch him but her reaction was stroking all down him.