You can certainly try.

Looking down at her with her lips locked on your cock, you freeze in the middle of a phrase. You take a long swallow.

She lifts her head up just enough to whisper, "Go on. Do your best."

You take a deep breath, in disbelief about what is going on, but figure you might as well continue trying to sing at this point.

As soon as you start again, Lisa immediately returns to business, except this time she is not playing around. Her lips are swirling around your tip. Her tongue is dancing all around your rock hard shaft.

The room starts to spin a bit. You can barely stand to look down at her going to work on you with her gorgeous cheek bones and perfect skin starting to take on a glow. Your voice is wavering. Your pitches are drifting sharp and flat all over the place.

But she isn't slowing down one bit. With your cock firmly in one hand she is bobbing up and down on your shaft with her head with increasing seriousness.

You let out a gasping moan.

"Keep singing!" she quickly orders before getting back to your cock.

You can hardly concentrate. You feel like you are going to have a heart attack, but her lips are locked on to your tip and won't let up as she sucks and moans around your cock. Her hand is pumping up and down more and more vigorously. A volcano feels like it is building up in your balls.

"I'm coming," you suddenly gasp out before you explode into her mouth, your cum streaming out in seemingly unending jets. Lisa doesn't hesitate but instead sucks down your torrents of sperm while staring into your eyes.

And then she slowly licks off every drop of your cum from your penis.