Can I suggest my idea about your book called 'Forbidden love'? I have been reading it for a while at least three times and everytime i enjoy how I Is so original, different from other works and showing it's wonderfulness. Even if i tried to continue I wouldn't do as great job as you would.
Maybe you can make him remember her from his past school years and not only about her as butterfly and they could talk about memories . And then he could mysteriously find out about her death eater tattoo before they come across each other in a meeting where all death eaters are there, If not some of them at least.
Again thank you for such a original story of it's own. Deeply hope you find the motivation to continue.
With respects, a reader(Y/n) XD