Service Day: Squirting Practice

Sin's on her knees in rope, hands locked behind her back, hair pulled into a tight black knot. Robot's already got two fingers hooked inside her cunt, pumping hard, knuckle-deep. He wants her to gush on command. Every time she edges close he pulls back, makes her beg through gritted teeth. Then he switches to her ass, works a lubed thumb past the tight ring while his other hand keeps her dripping. She fights the urge to come, muscles shaking, but he pushes deeper, twists, forces it out of her. A hot rush spills across his wrist, then another. He keeps her there, open, dripping, makes her do it again and again until the floor beneath her is slick and she's nothing but a shaking, soaked mess.