
It's been hinted at for so long already. We've seen a bit of jealousy, but we need a bit more focus on them. I just need a subtle confession of sorts. More extra to solidify their union so that it could be a step up from only brother.

That slight jealous, or just simply angry, part is on vol 3, ch8, start on pg21.
I know some ppl won't agree with me and probably attribute this to just sibling worrying about each others, but like all the unlucky with woman stuff and aki/Shima seems to have no other friends just make it seems that abe sensei is intended to move them in the direction of brother x brother. If not, give them a gf/bf of even close friends other than just them two and Haru/Ren.
I can't wait to see how this goes.