he did n't leave the other side alone , couldn't-his fingers pinched , then tweaked her tight little nipple , telling it to hang on ; he 'd be there in a second- a sudden sting at the nape of his neck told him she had dug in , and abruptly , her thighs went wide as if her sex were dictating her movements , not her mind-and that vital core that defined her as a woman wanted what he could give her .