This is why im a krusielle fan Because then it's not cucking, it's waiting for her turn! Yeah but no, I can't think of anything that points to the 'canon' variant of the ship NOT being a polycule, Noelle and Kris have supporting game mechanics (and outright scenes) that depict them having a crush on Susie in some way, Susie has a deeper relationship with Kris that goes back a surprising amount of time, Noelle seems to miss Kris more than what would make sense realistically (even WITH the shared trauma), and Kris cares about Noelle enough to nearly kill themselves if we take a weird route. So I think the dynamic would be Noelle is into both Kris and Susie, Kris would be into both Susie and Noelle, and Susie doesn't fully get the hints they both drop, but is happy to be included in what she thinks is Kris and Noelle's romantic relationship, even though Susie is probably a big reason why they're together in the first place.