Even with the grease from the spell, it would be nearly impossible to escape the creature at this point. It has so surrounded her that there was no where for her to go. As she was squeezed from all sides, the grease would spread along her body and on the flesh around her. Her entire body becoming slick, the thrusting rocking her slightly. The stone skin made her body hard, so the soft spongey skin of her captor, and the grease, added an element of softness caressing her as the creature fucked her.