How do I make siblings fall in love with each other?

[cherry flavored pocky.]

Um^^; I know It probably sounds a bit weird, but I'm curious as to how I can make siblings fall in love with each other.
I've heard some people say they have, so I believe it's possible, but... I don't know how to. x_x;
Please help? XD  

[Noembelu]

You have to have the InSiminator or Inteenimator ((sp?)) in order to do that sort of thing.

Other than that, it's impossible to have them fall in love with eachother.