We will never find out whose plan it was. Things just followed one another! Here's the boyfriend's stepbrother, taking a shower at his place while his bro's chick is around. He comes out, and what does he see? His stepbrother's girlfriend is in the nude, on his own bed, telling him she had always liked him! Chemistry did its dirty work and here they are, fucking like rabbits. The slut totally deserved the scene the boyfriend made when he finally came around! The poor dude should have never left them alone in the first place!