To slow things down, try this "soft bondage" position. She sits on top of you, then you both lean back until you're holding each other's ankles. It's actually not as athletic as it looks - see right - and you can hold each other's calves instead if the ankles are too much too ask.
Once you get going, she does most of the rocking back and forth, but you can pull her deeper by tugging on her legs. Leaning back will help her feel wanton, and because it's a slow one, she'll feel more romantic and cherished.
Try it between more vigorous positions.
Illustrations by: PAUL VILLARIBA