Lie on your back and hug your legs against your chest, so your knees are touching your chin. He kneels on the bed and enters you so that your feet are on either side of his head or resting on his chest. In this position the vaginal canal is shortened, making every thrust feel deeper and more intense. You will need to be in complete control to tell him how fast and how far he can thrust (too much could cause pain as he reaches the cervix).
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