I don't see the "heart eyes" and the chemistry. I know, I know, I'm in a minority here. But, I see her with far more sexual chemistry with D'avin or Alvis than with John. I totally get how those who see that chemistry want some steam. I just don't see it. To me, they have awesome "I love you forever/ Ride or Die" chemistry. It's just the same as I see with say Oliver & Thea on Arrow. Two BAMFs that can be partners kicking butt even when one of them is more "the boss" in the field but they'd do anything at all for eachother.
I just always took the characters at their word, right from episode 1, where they referred to eachother as siblings, not lovers. Maybe that's why I can't get past the idea that they're going to end up lovers. They're more like brother and sister and it's kind of incesty.