Oh okay, I guess they are in the roommate territory (the whole "more than friends, less than lovers") but it seems clear they are basically dating in any sense except actually saying they are. Haru is a bit too pure while Asahi has the comedy filter so even though they do L.S. alot, they still haven't quite crossed the dating line.
Also nice! We got a side-couple with Shigaccho and Yan-chan~
It feels kind of weird because Asahi already gave a sincere "It's you I like" after joking it was her boobs she liked, and basically proposed with the talk of feeling like they were married and the "I wouldn't mind spending the rest of my life with you" line. And Haru said that she even liked Asahi's annoying side when pressed.
Is Haru saying she doesn't know what kind of "like" it is? Or that they might just be friends with benefits? I guess Haru pretended she was asleep the one time, and the rest Haru says she can't tell how much Asahi is serious or joking. And Haru was basically forced to reluctantly say she liked that side too, so maybe it doesn't count?
But I think if you asked Asahi, she's already confessed at some point and they're dating, and maybe she thinks Haru is embarrased and doesn't want to admit it to their friends.