Nono, that's why I'm here!
But I don't really see how any of the things you've mentioned could be a basis for the extremely rapidly blooming romance of this route, when none of them were portrayed or used in this manner. They were good reasons to become friends though.
I think the chemistry you're seeing in this route is actually entirely inside your head this time(and maybe you and the author are on the same wavelength about this) - to me it's obvious the plot is missing some key developments between "we're chatting about studying" and "we're cuddling half-naked under a blanket".
Though I don't know what we're even arguing about here, the route is literally underdeveloped, you can't even derail it if you try, and I tried.
It has my favorite interaction with Lake though! Jealous Lake! Or maybe I'm the one reading too deep into it this time.
After the game night, regardless of whether you visited it or not, you won't be present for the power outage. So at the supper Lake goes: "too bad we didn't have you there :C I have to talk you into staying with us next time. So what did you do?" - "Stayed with Bjorn". Lake, without moving a face muscle, looks up at Bjorn, who has been towering over them like the Eye of Sauron the entire time: "Oh hi, Bjorn, didn't see you there." xD Yeah, right. And then Lake's like "Oh well, gotta go!" and skedaddles to avoid drilling a hole in Bjorn with a jealous look. He's such a sweet idiot, I wish there were options to derail other routes for Lake :3