ISO Fanfic where Severus Snape uses Fiendfyre on Harry’s Horcrux?

It’s a slash, I think parental figure Severus Snape but I could be completely wrong. I think it’s Draco/Harry but it could be Harry/Severus (I really don’t think so tho) anyway Albus says Harry must die via the killing curse from Voldemort and everyone flips out and screams at him and says there’s another way. Severus used Fiendfrye on Harry’s scar to kill it.

There’s also a second one, same scenario, probably Draco/Harry, where Severus uses Basilisk venom.

They’re both completed and 99% sure both are on AO3. If anyone knows I’d definitely appreciate a link!