My nano has been a bit schizophrenic with two veins one clearly YA various historical characters at a boarding school displaced from time. Don't want to lose them though they add a fun comedy element. Bear with me this is complicated. Then there is the very adult relationship (not erotic) going on between my 130 year old characters - the tone of the issues involved is not YA. Wasn't a problem until the story actually started to turn out well. I had never intended it for anything other than fun. Anyway inspired by Torchwood series 3 Spoiler with Captain Jack blowing up his grandson to save the whole Earth I was wondering if introducing the issue that these children have to go back some of them to terrible ends (Boudicca, Guy Fawkes etc). They have to be replaced in order for my main character to save the universe and return his lover. If I make more of this does that turn my YA element into something more grown up?