Oh, and by the way, sorry for not finding the existing
Otome thread in a search. Oops! ^^; It's because I searched for the "oboku" that seems suggested to me by the title, vs. "boku" used in the thread and other places. What's with the missing "o" - some grammar rule? Anyway, just thought I should point "that-a-way" for discussion already in progress.
Edit: I asked a Japanese friend of mine about it, and he said that they're using a different furi to bring emphasis on the real meaning of the title - that the "onee-sama" is actually a guy, and the guy is actually you (the main character). His suggestion, incidentally, was Otome wa o"nee"-sama ni koishiteru. Anyway, for the 1 other person out there who may be wondering the same thing I was, there you have it... ^^;