Captured, Bound & Made To Cum

My captive, Alex - is completely helpless. So when I bring out a Hitachi, and place it between her bound legs, she can wriggle as much as she wants but she can't get away from the relentless pressure on her clit. Against her will, her body orgasms again, and again, and again. I make her cum over and over for my sadistic pleasure, teasing her, taunting her and reminding her that she is my captive and can do NOTHING to prevent my using her however I want to