Harry feels a sinking foreboding at the way Dumbledore says Snape's name. He is momentarily relieved to see the man. He thinks he is here to help, but when Snape hits Dumbledore with the Killing Curse, he is ready to be a monster.
Harry is laying on the lawn in front of the castle, utterly defenseless, as Snape stares down at him with a look of wild hatred. He watches the man's fury boil over when he calls him a coward and lays down the challenge to kill him. He no longer believes that any of what happened in the glen had been real, but he is left with a nagging uncertainty when Snape chooses to hit him with a non-lethal curse before fleeing into the night.
Harry is alone with Hermione in a remote wood and Ron is gone. He does not know how to comfort her anymore, so he takes off the locket and digs down deep and fills the tent with towering sunflowers. He lets out a breath he didn't know he was holding as he watches her smile for the first time in several days. He gives the both of them the strength to soldier on.
Harry can hear Snape's skin tearing open as Nagini bites into his neck. Once Voldemort is gone, he retrieves Snape's memories and gives the man one last look at his mother's eyes. He leans in as Snape cradles his face and smiles, before his soul passes beyond the veil.
Harry pulls his head out of the pensieve and collapses onto the floor of the office, shaking from head to toe. He has seen everything. He finally understands why Snape had said that none of it had been for him. He does not care. He spares precious moments and allows himself to cry.
Harry returns to the Shrieking Shack one day after the Battle of Hogwarts and finds Snape's body exactly where it had fallen. He apparates them to Godric's Hollow. He knows that he could use magic to clean the body and dig the grave next to his mother's, but he does it the Muggle way, using the physical labor as a way to cope and care for himself, just as Snape had taught him. Before he leaves, he casts a Florerio over the entire graveyard, filling it with bursting red lilies.
He does not think his father would mind.