Harry Potter and the Guardian Situation (джен)

Sequel to Harry and the Snakes.
Please read the tags
Harry runs away after using accidental dark magic on his aunt Marge. He goes to the leaky cauldron, paying for a night there. Shalis and him go to Diagon alley the next day, there they find a book of every dark spell that's been recorded. Shalis tells him he must get it. (Important to the future parts.)
Snape finds Harry alone, unprotected, and jumpy. He realizes why Harry ran away; decides he can't trust anyone else to care for a child with ptsd. Because Snape understands what Harry is going through, he takes him in and tries his best to care for him.
They return to Hogwarts after a few months. Harry's panic attacks haven't gotten better. (the dementor are replaces with panic attacks and other episodes) Remus and Snape argue over who is best fit to raise him when Remus finds out Snape has been caring for him. Remus wants to take harry in and raise him with Sirius. Harry doesn't know how to or who to choose.