You see, Niall didn't know the real Harry. He didn't know what Harry did for him and how much he really cared. He didn't know that Harry sold his body to pay for his daycare, to pay for him to get out of the foster home every once in a while so he wouldn't feel clogged up inside. He didn't know a lot of things, like where his brother's scars came from or why he would come home sad sometimes. He just didn't know, and that didn't bother him, since he was only four and not really wondering about anything other than the good things. And Harry wanted to keep it that way.