Her cunt

Monica sits down hard on your face. She leans forward and braces herself against your thighs, then grinds her cunt into your mouth.

“Well?!” she shouts. “Get to work, you little piece of shit! Lick my pussy clean!”

You lick. It already tastes pretty clean, but it must not be up to Monica's standards. You start on the outside of the lips, teasing them. You trace around the edges, slowly, slowly working your way inward.

After a couple minutes of this Monica squeezes your legs so hard, the pain makes you arch your back. “Enough of that! Get your tongue in there!”

You stick your tongue as deep into her pussy as possible and work hard to satisfy her. She starts to react, you can feel the gorgeous brunette move her legs on top of you, shifting as you make her react to the pussy cleaning. Her movements seem to indicate she really likes it. Unfortunately, her tone disagrees.

“God, you're so pathetic!” she yells. “You have no idea what to do or where to put your tongue. I need a fucking joystick. Oh wait, you have one.” Monica undoes your pants and pulls out your stiff cock.

“Okay, here's the deal. When I pull to the left...” Monica jerks your cock to the left, hurting you exquisitely. “...that means I want your tongue to go to the left. And the same thing for right, up, and down.” She pulls your cock painfully hard in those directions to make her point.

Monica rides your face for another twenty minutes, using your cock to guide your tongue. Her pussy gets more and more wet, tasting vaguely lemony.

Finally she drops your cock and says, “All right, this isn't working. You're so pathetic you can't find the right spot even with help, so we're going to try something else.”