First, get undressed and lie on your back using a pillow for neck support. Your legs should be bent and spread, feet together in butterfly position. If this makes your hips uncomfortable on one or both sides, just put pillows underneath the knees.
Your guy should sit to your right side on top of at least two pillows and straddle his bent left leg perpendicularly across her torso, foot flat on the opposite side. (It almost looks as if he's on top in reverse cowgirl position, except his weight will be to the side of your torso.)
Have him separate your labia and retract the clitoral hood upward with the heel of the palm. The he'll anchor the clitoris with the right thumb by holding the hood back. He should put his left hand under your butt, two fingers under each cheek, with the thumb resting on (not in) the base of the entrance to the vagina.
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