I think well written, and I can say, well enjoyed.
I have all seven books and still think the hero, even a such a young age, would have had more assertiveness's (backbone). So, I like your hero a lot.
Even in the cannon, I wondered who the dark lord was, Dumbledore or moldishorts. Still wondering.
You wrote of immortality. Does that end if one of the two dies? Wasn't sure.
Again, enjoyed the read, and look forward to seeing where you go with this.
May the MUSE be with you!!!