The delightful surprise
Aziz's eyes falls on the diary right after entering in the room. A pen was left by its side. While, Aaron was playing in his phone earlier, he was writing.
Aaron knew about his secret diary,he just didn't know what was written inside.
He once asked about it and the answer he got was," It's a private diary. You can't see what's written inside since it would be violencing my privacy and that's not a good thing."
That's all it took for him to keep his mouth shut.
He has always been a very mature kid. While Aziz was relieved by this,he also wanted him to act his age at the same time.
And the only time he acts like his age is when he's with Zidan. They are best friends, reason why he takes him to visit the orphanage so often.
He did offer to adopt Zidan but he politely declined it saying he would love to be just Aaron's best friend.