What I'm suggesting is that it doesn't matter if he willingly went along with it or not because it was an abusive and manipulative situation that she put him in from the start. You seem to want to narrow the definition of rape to only include physically restraining someone and having sex with them while they scream for you to stop, which may have been sufficient a few centuries ago but doesn't at all cover our present day understanding of abuse and sexual assault.
Btw uber I would see where you're coming from (tho still consider it rape) if the kid was 15 but an 11 year old is barely even an adolescent. Big difference.