His perspective is definitely a little skewed from "normal", but you did a great job capturing it. I also like the hints that he's in the wrong timeline or something. Or at least something is off for him.

Does this fit in with your other DA/SPN story? Because I have to admit I love the idea that Alec doesn't do a big reveal about Manticore and his genetically enhanced past. I don't think I've ever read a SPN/DA story where the Winchesters aren't aware of Manticore.