This position works because he focuses on all your most super-sensitive nerve endings. And guess what? He uses the most sensitive part of his body when doing it to you. Start by having him kneel on a hard surface, keeping his back straight. You lie down and face him directly. He lifts your legs up to his shoulders and you support yourself on your shoulders.
Holding his erection downwards, he penetrates you and holds you into position by wrapping his arms around your upper thighs. To hit all those magic nerve endings near your vaginal entrance, make sure he just uses the head of his penis and penetrates shallowly. Not only will you get an A effort, but a Big O as well!