Faberry — "Black and White" — Rachel finds Quinn's sketchbook.
I'm hoping someone will have, or know where to find, a copy of this fic. (The link I have for it is dead).
"Black and White" by pleasure...chest
Quinn doesn’t only draw pornographic images of Rachel on the bathroom stalls. Rachel finds a notebook full of them, and of course Rachel confronts Quinn about them and sexytimes ensue.