Contract sex that fmc doesn't enjoy

I have bit specific request. Every dark romance I have read so far falls into one of two categories: fmc is forced to be with mmc and she hates it(this includes "body betrayal") or she is into it. I want romance where they agree at the begining that fmc has to do everything mmc asks for. And fmc only agrees to it because she doesn't have other choice. And at first she hates it and doesn't enjoy it one bit. Bonus points if its dark and has bdsm.