Solace in Shadows (Harry Potter) (Harry/TomRiddle)
When Harry is hit with the killing curse for the second time, instead of going to King's cross to meet up with Dumbledore, he travels back in time. Waking up in 1944 having no idea how he got there, he enrolls in Hogwarts under the name of Sirius Granger with Dumbledore's help. Yet to his utter dismay he is sorted in...