There’s this one Theodore Nott fanfic that popped into my mind and I can’t remember the name at all, just the details. I think the oc was a deatheater along with the others in slytherin, and they all ended up being forgiven but were required to go to Hogwarts for another year (maybe???) and it also follows her and him once they get out of Hogwarts officially. If anyone knows which one I’m talking about, please let me know!