Weighed and Measured

"Will this ever end?" I pleaded.
"Nope," she replied, wrenching her fingers across the blackboard again, sending a screeching cascade throughout my spine.
"Stop doing that!" I begged with another maddening shudder.
"Nope," she replied again, a vicious smile played across her face as she continued to scratch the board, her hands moving ceaselessly in all directions.
My brain screamed in agony with each grating assault. "Stop it, now!" I lunged after her impotently, as an unseen force restrained me to the desk.
"This is all your own doing," she grinned, revealing her jagged demon's teeth. "Welcome to Hell, sinner."