Harry Potter and the Veil of Death (смешанная)

Sirius Black falls through the Veil, and Harry Potter manages to jump in after him.
Instead of dying, he ends up in the past, staring at a young Sirius. After a freakout and a complete mental breakdown, he concludes that he ended up in the past, in the era his parents were in Hogwarts, to be precise, and he has to figure out what the fuck he is supposed to do.
The fact that Voldemort isn’t quite as insane in this period doesn’t help him, especially when he keeps finding himself in the man’s presence time after time.
He can change his parents’ fate, he can keep the Marauders whole and happy, but his saviour complex won’t let him stop at that- Harry will save Voldemort along with them. Perhaps his unbearable attraction to the cruel man is the cause of that. The tantalising way Harry’s name rolls off those perfect lips may also have something to do with it.
Or
Harry yeets himself through the veil and into the dark lord’s lap