and the smiling girl remained on her knees and she drove her knees apart as far as her knees would go and she stood as high as her knees would allow and she arched her back and she popped her ass back and started agitating the two fingers that kept it sealed , for she was waiting for its contents to mature and age gracefully , and when she decided the potion had been well stirred she squatted and she became tight and contracted and she finally gave manly birth to a bubbly spew of liquefied pearl .