To get the maximum amount of penetration from the side saddle position he can move himself towards her, pressing her legs toward her body and draping them across his hips. This sex position also allows her different sensations than most as his penis enters at a 90 degree angle. The deep penetration and different orientation of his penis creates some wonderfully different sensations.
Enjoy the mix of intimacy and naughty
One of the rear entry ones that allow us to see each other