Harry Potter had just gone back downstairs when the owl showed up with a small package tied to its leg. He was momentarily alone, everyone else being upstairs with his wife, Ginny. He unwrapped the package and looked at the small painting.
"Professor Snape." he stated, uneasily.
"Potter." the painting of Headmaster Snape, a copy of the one in the Hogwarts headmaster's office, snarled back.
"Sir," Harry began again, feeling like an 11 year old again, "my son. We're naming my son. He's, uh, he's got my mother's eyes. We thought you'd like that. We're naming him Albus Severus, after the two best Headmasters Hogwarts ever had.
Snape snorted, but said nothing.
Harry took him into the dining room and placed him where he'd have a view into the kitchen and the living room.
He rarely said anything, but Harry noticed him watching the children, particularly Albus, and later, Lily. And it should be noted that Harry knew before he received Albus' owl which house he'd been sorted into.