I have never wanted to see a polymerase relationship blossom into something possible, but man, after reading the last chapter, you can't tell me they all don't have feelings for each other; the chemistry and synergy are beautiful, and the eyes of happiness and love are evident between all three of them.
Like god, I don't know where I can read ahead or if this is it for the manga (FTTB), but I desperately hope that a poly relationship is the end goal.