Same pressure. Same rhythm. Wrong angle.
Nothing.
Position is not decoration. It is the only thing that decides where the contact actually lands when her body is already telling the truth.

Belly Button Aim
Point at it. Every correction you make is a correction toward it. Get this wrong and nothing else on this page saves you.
Palm Up, Always
Change nothing else and this alone fixes most men.

Pillow Lift
One pillow under her hips does what your wrist cannot, and it does it for as long as you need.
Legs Together
Tighter, and the front wall presses into your fingers instead of the other way around.

Straddle My Hand
She kneels over your hand and works herself onto it. She finds the angle faster than you will, every time.
Face Down, Hips Up
Changes the angle completely and gets her out of her own head at the same time.
The Edge
She lies back on the edge of the mattress, you stand. Your arm never gets tired, so the rhythm never breaks.
The Short Stroke
From behind, only go halfway. Every bit of the pressure lands on the front wall and none of it goes deep.
Test one thing at a time. Move her hips, or move your hand, or change her legs — not all three. You cannot read an answer to three questions asked at once.
The angle is right and she is climbing. Now put your other hand to work.