Visiting days at Hogwarts

AU story, kind of a contuniation of Family. Harry and Dudley grew up as close as brothers. But when Harry is invited to Hogwarts and Dudley isn't the boy who lived refuses to go without his cousin, in fear of losing him like Lily lost Petunia. But the wizarding world needs its saviour, so Dumbledore iniciates Visiting days at Hogwarts for the non-magical relatives of his students.