Ever since dealing with the monster in Ren's closet at the close of Volume 4 they are together-together, at least a little. But the Renora pairing has sort of been there on a low-key level since the beginning, since Ren is patience incarnate and Nora knows more than she lets on. Plus, the true anime watchers treasure the ship scenes but hope & pray it doesn't become a story focus. Bad things happen then...