In france, rape is defined by sexual intercourse in the absence of enlightened consent given without (...) force or menace.
Abel pressures, menaces or whatever Bob to force him to have sex with Cindy and to tell her he consents to it. Sex did take place without consent being freely given by Bob. Sex is done to Bob by Cindy without his consent, but Cindy is not aware of that, and did everything the law could reasonably ask of her : verify the age of the partner and ask for consent. Abel is responsible for (morally at least, and is the at the cause of) the consent being coerced.
Who, if anyone, committed rape ? Is it Abel who didn't have sex, or Cindy who didn't know about anything ?
I'm interested in how this would be solved in the french system or in systems where the rape laws are conceived similarly. Also, please don't take the gender of my imaginary protagonists into account.