Stepmom looks pretty young, maybe not even any older than MC - Dad's new trophy wife? If so... hmm, that dynamic might be spicy enough to overcome the inherent lameness of stepcest. "Well, well, well. The stupid old bastard thought he could trade Mom in like a used car for a sexy new model, barely old enough to be my sister? How fitting he'd end up with the village bicycle instead. Yeah, serves him right he got cucked... heh, might as well join in. Listen you, you've proven you're a whore... well, now you're MY whore. Exclusively. Unless you want Dad and his lawyer to see this video? I understand the prenup is pretty harsh - you'd be out on the street with only... no, with not even the clothes on your back. Yeah, that's right, back that ass right up over here and... goddamn, are you seriously that soaked right now? Jesus, girl, you are fucked in the head. This is gonna be so much fun.
...you know what, on second thought, turn around. Down on your knees, like the slut you are. If you like the idea of getting me inside you that much, well then you're gonna have to earn it. This is supposed to be a punishment, after all."
...it go something like that?