They Don't Know About The Two Of Us

Hadrian Potter defeated Voldemort, however, his life becomes a living hell when Dumbledore reveals that Hadrian carries a piece of Voldemort's soul within him. His parents start to neglect him when Dumbledore says that he will have to be killed by Voldemort in the future anyway, and everyone starts to ignore him in favor of his sister, Iris. As the years go by, Hadrian becomes bitter and cold, hating his parents for abandoning him, his sister for being treated like a princess, and the entire world for making him feel unwanted. His life changes drastically when he's thirteen and meets Aleksandr Tomáš Riddle, the new Defense Against the Dark Arts teacher, who takes an interest in him after catching him speaking in Parseltongue. Aleksandr, who is secretly Lord Voldemort, realizes that Hadrian is a Horcrux and starts to slowly indoctrinate the young Hadrian into his ways, brainwashing him and showing him that he's not useless or unwanted. Due to this, Hadrian begins to develop a crush on his professor, which only strengthens as they spend more time together. By the time Hadrian is sixteen, he has completely fallen under Voldemort's spell and is willing to do anything for his attention.