Originally Posted by ms511977
Mother(55) seduces her Son(33) and and they meet another Mother-Son Incest couple (may be known to them) of same age. With lots of swaping will add more exitement. Lastly they married with each other(M/F).
I don't know if the ages are the same, but I think I remember seeing this kind of story, about a swinging couple.
I hope you're ok with husband/wife, husband/wife stories.