This story was going so well, I was having such a nice time with it, but then it took a sharp turn from cozy to gross with that whole debt/blackmail bit.
I really hope that gets dropped/resolved quickly, because if the person involved IS going to be integrated into the core group like it seems, I can't see how they could possibly have a good relationship with the rest if the dynamic continues.
Even if not, blackmailing and coercing into prostitution are not things good people would do; hell, with everything else we already know she's going through, pushing her even further and then mocking her for it is just cruel.