Such a Small Thing

Harry spends the summer following Sixth Year with Hermione and her parents in the Muggle World. When he discovers a man at a nearby park that remarkably resembles Severus Snape, he becomes obsessed with knowing who he is. When it actually is Snape, and they start behaving amiably after a rough start, he finds he doesn't mind. It is, after all, Such a Small Thing. AU, 7th Year, SSHP