Simply kindred spirits.

I once read a long article about the Roosevelts.   It taught me about how Eleanor's last name was Roosevelt even before she married Franklin (distant cousins).  The author suggested an affair between Eleanor and Lorena Hickok because they wrote each other many long letters, one of which stated, 'I kiss your picture before I go to sleep at night.'

I'm still not entirely convinced; the same could be said of me and JAN.