Concerned about the backlash that occurred when Harry defeated Voldemort, Lily and James have Harry's twin, Alaric, take the attention of the public to give Harry a chance to relax and recuperate; however, that also means that Harry must go to the Dursley's. Unfortunately, or rather fortunately for Harry, magic isn't as separated from the Muggle world as they like to think.
On the night that Tom orders him to relieve his family of his burden, through the power of his highly persuasive ability, Harry doesn't just survive the ordeal. He's saved by the most unlikeliest of people, and in turn, becomes the savior of him as well. (Book One of the Series 'Running') Fenrir Greyback/Harry Potter.
"What's wrong, Potter?" Whispered Malfoy, catching Harry off guard with how breathless and excited his tone was. "Vampire got your tongue?" And then he licked a tentative and long, fire-hot trail up the outer shell of Harry's ear with the tip of his searing wet tongue. Or, in which Harry is a rare creature -submissive- and is the mate of Draco Malfoy, vampire. Need I say more?
When Harry and Dudley are attacked by Dementors the summer before Fifth year, something goes incredibly wrong – Harry's soul is drawn out of its proper position, and it's only by a miracle that he even survives the Kiss intact. Though not unharmed, and definitely not completely unchanged.