A middle aged man chances upon an older couple and his young tasty heartthrob engaged in a threeway which results in insane sex

A man wakes up to find his girlfriend and a man and women involved in intimate acts of sex. He cannot help it, so he participates; and once again, a militant, European-style orgy of orgy is formed. This is amusing and enjoyable and expertise of the mature couple make it a very colorful night to remember.