Lick her.

Ignoring the plea of your mother you begin to gorge yourself in her pussy. Giving her vulva a few good licks and a bite, you then slip your tongue inside her moist snatch. You taste her sweet honey with each lick. As you dig in you hear loud moans escape from your mother's mouth. You look up and see that she is now pinching her nipples and pulling on them roughly. She raises her hips, and your face is greeted with her love juice as she cums over your face.

"Keep... going..." she says, breathing heavily.

And that is exactly what you do. You grab her thighs and pull yourself in closer and begin eating her out once more. You continue pleasuring your mom until her third orgasm. At this point you are feeling more turned on than you were before. It's time to give the slut what she wanted in the first place.