Ok, time for more attention for her. Take the vibrator, and get her to suck it so that it is lovely and wet. Now tease her pussy with it. Tease her clit, her lips, and finally insert the vibrator. Leave it on a mid level vibrate intensity.
Tease her and fuck her with the vibrator. Occasionally take it out, and replace it with your cock. Tease her and fuck her with your cock and vibrator, but avoid getting to the point where she can cum.
Shift around into he 69 position, and get her to suck your cock while you continue to tease her with the vibrator.