Sentence:  They were on the couch for nearly an hour, then in the shower for she didn't know how long &mdash; until the hot water started to fail and drove them out, anyway. Then she took him into her bed, where she lay too exhausted and too content to do anything but <WSD>bundle</WSD>. 
Meaning of the word marked with <WSD> tags:  To sleep on the same bed without undressing.