This one is really close, but plans of the Stepmom turn naughty for an intimate encounter involving the Ste stepson

Naughty stepmom episode depicted as she tricks her stepson into coming to where he will encounter her. They have a very private moment together where Samuel takes her sexually and turns her into a nasty girl on the rooftop before they both go for a wild ride that ends with an intense 1on1, creampie.