This was a delightful read. You established the period feel very well, and kudos to you for portraying the different accents in the beginning.
All of this felt real. None of the characterizations were forced, and the plot was good and ambiguous until the end.
I liked the freedom Severus had (by not being his teacher) to openly want Harry in this. It was also lovely seeing Harry trying to be trusting of Severus but having his doubts at the same time.