Meanwhile, her sister was pumping up and down with grim determination. Her eyes were clenched tightly shut and lines of urgency crossed her brow as she bore lustily down. Her lips were parted and she was breathing heavily, making low breathy moans so that she sounded like a stream locomotive laboring up a hill.
It was obvious that both girls were straining towards orgasm by now, and my first impulse was to whip their bouncing bottoms even harder, but I stayed my hand and stepped back, curious to see them finish themselves off, for they were consumed with lust now and truly needed no further urging from me. Catherine’s moans had turned into low animal grunts as she hunched over and clasped the idol to her thin bosom. Her slight body shook violently. She threw back her long blond mane back,
