until we are safe , it would be foolhardy to engage our bodies in any of the various forms of copulation , be it with our hands i ran my hand over the front of his boxers , and his entire body tensed , our mouths slowly , i licked his neck , and then kissed my way up to his lips , all the while rubbing my hand over the stiffening bulge in his boxers , or i dropped my hips to rub against his , gently at first , but then a little harder .