Harry is nine years old when he points at Lord Thomas Marvolo Slytherin, High Warlock of England, and declares "You're my soulmate, and we're going to be married." Soulmate AU, Alternate Timeline, Potter Family Lives, Harrymort
Or in which Voldemort raises Harry as his; in all facets. (Harrymort)
Draco is sure he accidentally touched one of his father's illegal artifacts and is hallucinating as a result. Why else would he be seeing Harry-Bloody-Potter prancing around his house with Lord-Bloody-Voldemort? LV/HP
His mother says that Harry's laughter could be the cure. Tom never believes her, of course; but he can't help hoping.