When they first called each other their "partner" in game, I was like, "Oho, I know the game probably just means that they're both in the same knight unit or something, but hell yeah, I ship it". But then I gradually realised that they both serve completely different roles in the knights of Seiros, none of the other knights talk about having a "partner" in that way, and the only time Shamir does talk about having another partner is in the context of a former lover. So I started to wonder. And then in their A+ support, Shamir casually brings up marriage as the natural next step for their relationship, and I felt like my brain exploded with the realisation that they really were dating the entire time.