The Supernova
An on-top position at the bed's edge where the bottom partner slowly slides down until their head and shoulders rest on the floor. A head rush in more ways than one.
One partner lies on their back across the bed with their head and shoulders near the edge. The other partner straddles their hips in a squat facing their feet, feet flat on the bed, and lowers down. Once you're settled, the bottom partner slowly slides toward the edge until their shoulders, then their head, rest on a pillow on the floor while their hips and legs stay on the bed, arching their body downward. The partner on top keeps their balance with hands on the bottom partner's thighs or on the bed behind them and controls the pace by rising and lowering from the squat. The arch changes the angle sharply; staying higher on the bed, with only the head off the edge, keeps a softer version.
A rush of sensation for the partner underneath and full control for the partner on top. Many couples use it as a brief finale.
The partner on top can kneel instead of squatting. Put a thick pillow or folded blanket on the floor where the bottom partner's head lands.
Slide down slowly and together. Moving too fast is how people slip apart or bump a head.
Hanging upside down makes some people dizzy or lightheaded. Come back up right away if that happens, and skip this one with neck problems or bad knees.
Agree on it before you try it, use plenty of lube, and either of you can stop at any point. This guide is general information, not medical advice.