I might be wrong but I think we haven't seen any kind of development for any character or relationship aside from Nagisa and Ichinose, and even then I think their relationship is mostly shaped for jokes.
Vol 1 has no clear plotline or progression iirc, could be simply because its an introduction of sorts but I really think this is meant to be the kind of gag manga without a clear sense of progression. Even considering the Karasuma chapters I don't see any meaningful progression that could suggest a trend towards romantic developments taking the spotlight.
It could still be too soon to know what Yamamoto wants to do with this manga but personally I'm not expecting actual romantic developments, could be that he wanted to get away from that for a while.