I read an absolutely wonderful fic tonight:
Infinite Shadow of the Soul by femmequixotic

Summary: A chance to stop Voldemort takes Snape and Draco back in time.

Yes, this is Severus/Draco and it's a pairing I read rarely if ever. I stumbled upon this story in my search for a specific cat!Harry fic that I couldn't find anywhere and while perusing painless_j's list of animagus stories somehow this one captured my interest.
It's more of a time travel story and if you like time travel mixed with history it's a must read.
I loved every single part of it ... couldn't stop reading and sometimes held my breath even. It's gripping, captivating and I am still speechless at the absolute beauty of this story.
The S/D ship is wonderful but not the primary focus of the story ... it's the story itself that won't let you go once you start reading.