Y/N is Theo Nott little sister, they are Irish twins so they were in the same grade, she was born late December. That meant she was part of the group. Tom, Mattheo, Blaise, Enzo, Theo and of course yourself. Everyone in the group were close since birth because of our parents so when the time came all the boys becaame death eaters weather they wanted to or not. Most of them did it to keep me safe as I was like a sister to them. But to Draco he loved Y/N they were soulmates, everyone knew it. So when she got the mark and kept it a secret until the next meeting they are shocked. Angry but not at her knowing she definitely didn’t have a choice as i always denied getting it.