Very sweet and... I hesitate to use the word innocent for an NC-17 fic, but there's something of that here, especially in your young Hagrid. I can see how this pairing could happen; they're both outcasts in a certain sense and could find comfort in one companionship in one another. For some reason, I especially liked Hagrid's joy over getting 12 AM, even though he isn't housebroken yet ("He'll learn!").