Snapes sister - The Marauders Era

"Snape has a sister!"
"Oh hello James, how nice of you to join us. NOT LIKE WE"VE BEEN PANICKING ABOUT WHERE YOU COULD'VE WONDERED OFF TOO!!"
" Calm down Moony, his probably just a little shocked there's two of them now" squeaked Peter
"Bloody hell, how much you wanna bet she's got the same greasy hair and ENORMOUSLY large nose just like him."
"Oh Padfoot, WE'RE DOOMED"

Where Severus Snape has a twin sister, who's moved from Beauxbotons Academy of Magic. Where she finds comfort in her new hogwarts house and is nothing like anyone's expected. But the real question is who will she end up with, with half of the hogwarts population pinning after her?