Outstanding! I like the comparison you draw between Snape and Sirius. For different reasons they both want to see James in Harry.

That is a great defense of Snape's actions. I think Harry would agree with you.

They got off to a bad start right at the beginning when Harry thought Snape was making his scar burn instead of Quirrell. I don't know what would ever make the two of them friends. Maybe fighting side by side would give each of them more respect for each other.

However, Snape being the adult, should really try to adjust his attitude toward Harry.