Looking for a snape/Harry time travel fic

[Slytherinheadgirl]

I remember in this story that Harry was sent back to the founders time. He was taken in and raised as Salazars brother. He had to live in that time until the magic that sent him there returned him. While there he married and had children at Salazars prompting as he needed heirs. Harry left journals to all of his children of what really happened and it turned out that they did for him when he returned to his original time. I remember Harry ends up defeating Voldemort by tricking him into a ritualistic removal of blood that took away Harry's blood used to resurrect and the magic holding his form together.

I don't remember where I originally read this, I thought it was on aff but can't find it. Any help is appreciated, thanks.