Well, there lived a stepmother and stepdaughter, and a stepfather and stepson, and they didn�t touch anyone with their hands or feet. But at one fine moment they decided to live to...gether as one family, so to speak. And it seems normal that a mature couple fucks constantly and periodically, but where to put a dick in a boy who is already nineteen? Of course, to his stepsister, calling this matter swing and giving the idea to his step-dad. How else did you think swing parties turn out?!