Oh, this was so good. So, so good. I adore older!Harry with younger!Snape, and this being a time-travel fic to boot, it's something to celebrate.
I opened the window this morning, thinking I would bookmark and definitely read later, as I knew I would find the themes appealing, and I've really enjoyed all of your fics I've read. But damn if I didn't get sucked in and read the whole thing in one go.
And you know what? I tempted to re-read right now. But I really should get back to, you know, everything I had planned to start several hours ago.
Love how you kept Severus *very* Snape-like. He's got self-interest in spades here, with his obvious insinuations that he considers Harry his reward for working against Voldemort.
I like how many things shifted and changed, among them Severus's sorting, his continued friendship with Lily, the Potters' baby girl, even the slightly disarming passing of Trelawney.
Interesting that what stayed static were the Horcruxes! It's rather a nice way of underlining how little imagination Voldemort has, for all of his raw power.
Great work! I know I'll enjoy revisiting this again and again.