Check out the comments for a link where you can read this story, including the first part edited and revised to include some more background.
"Can I clean it off, dad?"
Michael didn't dare move or speak. Kate took advantage of the fact that her dad was almost in a state of shock and didn't really give him a chance to reply. She grabbed his cock again, which was starting to deflate, moved it out of the way and begun lapping and sucking eagerly her dad's sperm. She started from what had pooled in his bellybutton and worked her way down. She made sure to be pretty thorough refusing to let even a drop go to waste. The taste drove her wild, she felt addicted to it. She pushed his legs wider and shoved her face between them, smelling and tasting every nook and cranny of her dad's crotch. She sucked one of his balls in her mouth enjoying the feel of the smoothly shaved skin, and then did the same to the other. She moved even lower licking and kissing his taint. She didn't stop there, she even started sucking the cum that had dripped on the chair. She'd never showed this kind of uninhibited slutty behavior with any of the guys she'd been with.