And thats why i hate Maho X Darjeeling
Kay X Darjeeling is better If you dont ship that guess i'll personally find you in my Firefly in WT and vanish you from existence(And this is sarcasm, everyone ships what they want)
Well, if the OVA's come out and deals with this scene and this ISN'T what happened, then undoubtedly we should riot in the streets. Otherwise, there is no other way, given all the context placed into that scene and it's lead-up, in which the series didn't end on those two confessing and (probably) then kissing.
It's true that they don't interact that much, but Makoto's probably the one Haru's closest with. Even apart from the nickname, Haru also is the most worried about Makoto in the sixth palace (without spoiling too much, their personal circumstances are similar in some ways).