Oh i love Lily Van Der Woodsen and Rufus Humphrey soooooo much! Much more than Serena and Dan. I wish their parents had ended up together instead of them. Lily and Rufus had such a nice story until they were together in the show my headcanon is that later, Serena and Dan split up (or not doesn’t really matter); Lily and Rufus connect again when they are much older… Even maybe grandparents for the same kid.  They would be so cute growing old together.