I love how this wave of transformation sweets over Susie when she really gets going, causing her to gasp and wriggle with the intensity of her feelings. The way she fingers herself, with one, then two, then almost three fingers, gives the feeling that she cant possibly get enough, or deep enough. That desire and need for more and more and more is answered by Susies intense effort - enough, in the end, to make her come over and over again.
