She felt the thick shaft slide between her lips. She could taste her juices on his flesh from her last orgasm before he moved up to penetrate her mouth. They lay on their sides, a position that let her control the depth and angle of his thrusting. Her strong hand was wrapped gently around his smooth-shaven balls, increasing the sense of control not only in her mind but also in his. She would be in control and it would be her that decided on the intensity, pace, and duration of his pleasure.
She had been teaching him that blowjobs were not a male dominated activity with her. He was a fast learner when he was told in advance what the lesson was to be. But she hadn't taken that approach with the pleasures of her mouth on his cock. She had given him a series of practical lessons without explanation. At first his attempts to control the situation or to thrust against her wishes resulted in immediate denial of her favours. From the start she would only take him in her mouth in this side-laying position or when she was on top.
As he became better behaved she turned fellatio into her enjoyment, making his coincidental at best. Using her mouth and hands, fingertips and nails, she teased him mercilessly, prolonging his pleasure into an excruciatingly delightful torment. Impatience on his part could result in denial of his orgasm, though she might not hesitate to continue stimulating him afterwards.