Between siblings

The world of "Avatar" is the world of intrigues. Why does Azula keep setting Zuko up? Due to the fact that every time when her systems are uncovered Zuko comes to be really mad and goes right to Azula's room. That's right - two conditions for wonderful sex out of two! Accoridng to Azula ofcourse. And this moment is not going to be any kind of other. Incidentally, the room's door slams in three, two, one ...