Okay, I need help. I'm looking for a specific fic on AO3 with the titular premise. The problem is that unlike so many other fics on AO3, this one didn't over-tag - in fact, I distinctly recall it having next to no tags. Like, not even characters marked - forget a description.

What I can remember:

• Sirius Black is actually a Death Eater and abducts Harry from Hogwarts at the PoA climax.
• It's a kind of adoption/parental thing??? Maybe.
• Harry attends Durmstrang by the time updates stopped.
• I remember something about Voldemort being alive and handsome in the vicinity of the Netherlands. Maybe. It's been a while.
• Something like 20 chapters or so?
• NOT published in the last 5 years at least.

It was good enough for me to remember and get it stuck in my head, but foolishly I forgot to bookmark it, and with no tags I am struggling to dredge it up. Please help?