Here's where I'm at on this, and I know I'm wrong and condoning sin, etc, so don't get on me about that. I'm glad for the kid. He got what he wanted and no one got hurt (Of course, you will all say, other than his soul). Is there any man alive who deep down can't see why this was done. Good God, at 15, all I wanted to do was have sex. Now I only want it every 5 minutes. LOL. The kid suffered mightily in his life, and if he wasn't going to die then there would be no question this was totallly wrong. However, if granting him this one wish made his life a little happier in the short time he had left, all the better.
The kid was wiser than his years. He said he wished it could last longer. Don't we all. Don't we all.
As a Christian, I wish more people would use Scripture as a lamp instead of a sledgehammer, particularly when mercy and compassion are more sought than a lecture or a doctrinal thesis. I will not say what becomes of this child - it is God's to decide. That's what makes Him so difficult for us finite creatures to fully contemplate when we seek rigid answers.