One piece of evidence of how excessively James spoiled Sirius:
Obviously, James knew the “Shrieking Shack incident” was a grievous mistake, but I honestly don’t feel like Sirius ever took it that siriusly, even in his later stage.
Really don’t think James ever blamed him for this, or even properly talked it through with him.
Plus, it would be a really big deal for Sirius if James did blame him for this, because James is the person he cares about more than anyone else in the world.

















