Author's note: alternatively . . . a much happier drabble.
He had done what was required of him and, much to his own surprise, was still alive. He stood alone on a muggy, traffic haunted, London morning. He could walk away with no more than his wand in his pocket: finally free. The door of Number Twelve Grimmauld Place slammed open and Snape bounced down the steps.
The house vanished and Snape smirked. 'Well Potter, I fancy some beer; are you coming?'
Harry realised that Snape has made the suggestion just because he could. He'd probably think it funny when Harry refused.
Harry understood completely. 'Ok,' he said and smiled.