The gag is large and fully inserted. The harness is super tight, and includes a strap around the neck, as well as partially across the eyes. The rope blindfold is a perfect added element, pulling her head back. In this way she is forced to watch the ensuing action, just able to peek through the cracks as we approach with the stun gun, brand, knife or whatever implement we’re about to use on her breasts.
Of course I would start with some fondling of her strapped down body, and some loving caresses of her pretty face, followed by some brutal slaps to further tighten the strap around her neck and jerk the rope around her weeping eyes, burning the tender skin there. Imagine the crying and sputtering that will occur even before the first thrust of an icepick through her inner thigh.