Mia's stepmom did not approve of her new boyfriend that she brought home with her. I think she was just jealous though cause after getting to know him she suggested a threesome. They were both shocked of course but didn't reject the idea.
So after a while it actually happened and this lucky dude could get his big schlong sucked by mother and daughter. After that Mia rode the boner before she let her stepmom try it for a while. These chicks also licked each other, what a kinky family!