(Marking this as seeking Reccs because if anyone knows of something similar or else Seer!Harry orientated then I'd appreciate those, too <3)
So I can't remember if I read this on A03 or not, but in the Story Harry is a seer, and he has been kept protected and ensconced, wrapped in wealth and privilege like a bird in a cage since it was discovered that he's a Seer.

Tom treats Harry... decently(like a pet he likes to toy with cruelly before making up for it with kindness) but not like a human being. I can't remember how he ends up in Tom's care but the war is definetly still raging and has expanded across most of Europe (I think I remember a scene where the French and German Miniters are assasinated, bringing America into the war on Dumbledore's side.).

Harry is lonely, and slowly falls in love with Tom, but the fic is heavy on the angst and the love is definetly unrequited until Tom gives Harry one of his Horcruxes and this Horcrux comes to life and becomes Harry's love and protector without Voldy-Tom realising it.
They then run away to America(I think?) And begin plotting to kill or absorb or... remanufacture Voldemort into Harry's Tom.

It was a really long and VERY well-written fic with loads of twists and turns and truly beautiful, poetic writing.

If anyone can remember what this is i'd really appreciate it T-T