Sentence:  Then he knelt over her and began to make her wet with his fingers, finding her <WSD>sweet spot</WSD> the way he used to, so brilliantly, finding it, working it, moistening his finger from his lips and from herself, setting the fire raging in her now. 
Meaning of the word marked with <WSD> tags:  The clitoris, prostate gland, or other center of sexual pleasure.