I have the same problem with this as I seemed to have with Making Lovers:
It's utterly ridiculous. They go way too hard and far into the ham paint with the "comedy" bits. All of my interest in this game pretty much went out the door when the principal thing happened. It wasn't funny. It wasn't cheeky. It was just dumb. Poor execution, poor follow through, andliterally no reason why it needed to happen in the first place.
This game assumes all of the characters are fucking blithe idiots. Except for Kaname maybe. Not to mention the game all but makes fun of you for choosing anyone other than Kaname.
It sucks because the girls are genuinely cute, and there could have been a lot more to this, especially since they're all adults in college. But no, no chance of that happening.
I don't think this game is interested in incest, and personally neither am I. Over half the games on this site are packed with it.