LOL yes, Elizabeth was a writing experiement that went awry, but I left it in, running awry because I was kind of fascinated with what was happening and wanted to see how it would turn out at the weird meta level I was looking at it from. One of those "the characters took over and the author could no longer control things" issues. I can explain later in a note or comment when it's not a spoiler. 

I was wrong on my last reply. I got confused with the other spot I'm editing and posting from. Harry's 17 in this story right now. 16 is age of consent in UK with no age gap provisions that I can tell. Not that that makes it not subject to some serious scrutiny for damage to the younger party. And fingerwaving at the older person.

Harry's fascination with Tonks is in part a fascination with the idea of her life that Harry wants to have himself. Maybe less so a fascination with her, exactly. The kind of thing someone might outgrow, eventually. If it doesn't develop more as a proper relationship with the person in front of you rather than the ideal.