Mistress stands, her silhouette stark against the soft red lighting, her voice echoing in the expansive room. She begins her lesson, her tone stern yet enticing. "You will jerk off when I say, how I say, for as long as I say," she commands, her eyes locked onto her submissive's. He nods, his hands already moving, following her explicit instructions. She dictates his every move, from the speed of his stroke to the pressure of his grip. She demands he use both hands, that he lube up generously, that he make a mess. She watches, her expression inscrutable, as he struggles to hold back his orgasm, her voice the only sound in the room, her words the only thing guiding his pleasure.