Black's Daughter and the Half-Blood Prince

!Age gap warning! If you're not okay with it don't hate, just dont read, as EASY as that. :) What if Sirius Black had a daughter? What if she had feelings for her potions professor but he hated her for her last name, he hated her smile, her laughter, everything about her just reminded him of Sirius Black. But what if...

Professor

A change in career brings two people as close together as they always wanted to be... but is it too close?