it doesn't matter how many sides to the story there are. you're assuming one thing, op clears it up, and you try to find a reason why their partner might be trying to spring rape kink on them, like they have a valid reason. they don't. don't try to make it logical. if they're talking ooc in private frequently and the partner's been on board with smut, spoken about wanting their char to jump op's, and not mentioning dubcon/noncon, then there's no reason for op to go 'oh, by the way, should i expect dubcon/noncon out of this seemingly consensual set up?'