Harry Potter, Daphne Greengrass, and the Half-Blood Prince

Harry Potter enters his sixth year, after an action-packed first five years at Hogwarts. However, the year doesn't start as he expected, as he's introduced to a new professor, told about a worldwide school quidditch tournament, and discovers that he's in a marriage contract- betrothed to Daphne Greengrass? (BEING REDONE- "Harry Potter, Daphne Greengrass, and the Whirlwind 6th Year)