Harry and Arcturus Black

[tlyna]

I am trying to find a story I read some time ago where Lord Arcturus Black decided to take on training Harry. Lord Black and Charlus Potter had fought against Grindelwald and been made Barons because of their actions in the war. They were quite a lethal pair in the war and the way he trains Harry reflects that. Harry is at Hogwarts I think when he was taken on by Lord Black although I know there is another one where he has Remus bring baby Harry from the Dursleys and raises him.

Edit: Found it, Honor Thy Blood.