Did the change in age of consent for m/m sex ever go through? I recall a great deal of news coverage several years ago, when there was a movement in the UK to bring it down to 16, in line with m/f sex, but I'm pretty sure that particular attempt derailed in the house of lords. I no longer read news.bbc.co.uk daily, so I might have missed a more recent one.
At any rate, yay story! I like the point where Remus loses (and regains) his temper, and how that finally pulls Harry out of being so self-absorbed.