Hogwarts.

Millie has been best friends with the slytherin boys for years , they all had similiar childhoods …growing up in the shadows off death eaters — so they were all expected to become one themselves..become loyal to voldermort — they all learnt to use the deadliest curses at the age of 10 the boys learnt it quickly whereass Millie …she hated the thought of even hurting a fly.