He feels the tug tighten, slightly, as he finishes speaking; apparently, as far as the magic is concerned, that's binding enough. She strokes her hand over his chest, slowly, before climbing onto the altar with him, straddling him, pinning him down the altar with one hand; just her fingertips strong enough to keep him pressed down, as she rubs herself against his length, clearly taking her time to tease and enjoy him, especially as she takes her second hand, and guides his hands up to her breasts.