this situation doesn't scream of smut to you? John's been 'dead' for two years! He's been trying to lead his poor aocalypsed city through hell and he's probably become an iceman just to deal with it.

This screams of Lizzie saving him. Elizabeth reminding him he's human. Through sex. *whistles* Her letting him be vulnerable again, because seriously, Elizabeth is the only one he'd trust to take care of him.