The Shoulder Stand position is a reasonably challenging position in which the penetrating partner holds the receiving partner up during penetration.
To get into this position, the receiving partner lies on their back and the penetrating partner kneels in front. The receiving partner wraps their legs around the waist of the penetrating partner. The penetrating partner lifts the receiving partner up to enter them. The penetrating partner lifts the receiving partner up and supports them by placing an arm under the receiving partner's back. The receiving partner shifts their weight to be supported by their shoulders.