The Tale of Two Serpents

Nashira Black, daughter of Bellatrix and Rudolf Lestrange meets Evangeline Derwent, adescendant of the famous Dilys Derwent, at St Mungo's where she's because of her mother. Unexpectedly, their fates intertwine again on their way to Hogwarts. So how did the Teacher fell for her Student and how an unloved child of Bellatix Lestrange managed to learn her how to love again? f/f AU