His back will arch, his knees will bend, his fingers will find your neck and your hair. You probably never payed attention before. Though the rules of engagement are not clearly delineated, your role is a passive one. There will be no kissing, of course, and the more sensitive spots are off limits to your hands. Nevertheless, Summer was bold enough, while sitting on your lap and facing away, to take his hands in yours and place them on your bare hips.