Sitting on his lap and curling her legs around his waist lead her to one of the deepest penetrations possible. Meanwhile, she lifts herself a little so that he can stimulate her more with his fingers.
Steps to perform:
Step 1: He sits on the floor folding his legs so that knees point forward.
Step 2: She sits on his lap resting one palm on the floor and wraps him around his neck with the other hand.
Step 3: He grabs her booty for better support and gets into the position.
Step 4: He now pushes harder to go deeper.