I've only recently discovered this archive, so I am enjoying finding a treasure trove of well-written, enjoyable stories such as this one. It was delightful to watch 'Darrius' and 'Livia' grow up, and the storyline has been excellent. One thing I did notice, however, is that your timing on the children's aging was extremely odd. Your author's note stated that they aged about a year/week, but they had gone back in time a year. I think it more likely, then, that they aged a bit more than a year/month - 365 days divided by 15 years comes out to one year per 24.3 days, so if you aged them one year every 24 days, they would be a bit over 15 at the beginning of the school year, as is appropriate if they were "born" in June, as Arabella told Narcissa.
I look forward to seeing an email telling me that the next chapter's been posted. :) Keep up the good work!