Up until Owen Wilson brought it up, I honestly believed it was more a very simple case of, "Sylvie has found someone who actually understands and supports her, which is such a momentous change it actually affects the timeline of the universe." And not because that person is a Loki, because they're so drastically different from each other they're effectively different people.
But then Owen became a shipper and ruined the simple explanation with an overwrought, weird one.
But then Owen became a shipper and ruined the simple explanation with an overwrought, weird one.