He really does think of Corvin as a father, or at the very least, something close to it. The only other person Harry’s ever really considered as anything close to a parent is Sirius. Yes, Molly and Arthur were very parental to him, in every way, but they were never his parents, really. They never really reached that level. It was only ever just Sirius. And now, Corvin is up there too. After everything he’s done for Harry, everything he’s given, everything he’s offered, all the support and understanding and everything, he’s family. Knowing Corvin feels the same way is comforting.