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Lillith Riddle, formerly known as Heather Jones, goes to Hogwarts for her fifth year. She is angry that Harry left her in the graveyard. Voldemort is her father, and they have the same desire: Kill Harry Potter. However, Lillith keeps a diary in which she loads with everything. And when she starts falling for a certain boy with a scar on his head, she writes that in there too. But when she left her diary on the train, Harry discovers it and reads everything. Little does she know, he feels the same way. Despite being Voldemort's daughter, will Harry and Lillith get together?
When Voldemort discovers this, it's too late. They kill him and win. But that's for later.
(JKR owns all except some of the plot, and I own Lillith Riddle/Heather Jones.)