What have I seen? you ask. Well, this is what I have seen:
Lupin and Sirius say a lot of things in the third Harry Potter book that make me wonder if their relationship is more than platonic. I'm sure you wondered the same thing when they were having their little chat in the Shrieking Shack.
I think they may have been in love.
Moving on.
I would like to say that Zammue is brilliant.