I read this forever ago, and was reminded of it today. Basically what I remember is that Dean is in a gas station, sees a Valantine's display that's been worked over, remembers the date, debates about how sappy he wants to get, and buys the "left-overs" for Sam. Dean comes into the hotel room and sort of plunks everything down, but Sam knows what the gesture means and is moved by it. They probably have sex. ;)
Thanks in advance.