So I hadn't actually read this until Blastaar mentioned it as being good. I guess I looked at the title and thought "Huh, this seems way to triangly for me" and then at the subtext tag and thought "And yet at the same time, not triangly enough". Which in a weird way is actually true despite her brother's, uh, circumstances--but it doesn't matter because it really is very good. Thanks for the tip, Blastaar.
I do wonder about the subtext. One thing I'll say for sure--while nothing overt may ever happen in the manga, while neither character may ever have any kind of realization . . . the MANGAKA sure as hell knows what she's doing.