Businessman Pascal has relocated his son, Sam, to Belgium, hoping for a fresh start with his new wife. But Sam, a lustful young man from the UK, has his sights set on more than just settling into a new home. From the moment he meets his alluring stepmother, he can't help but fantasize about having her in every way possible. The title says it all: "My Stepmother Is a Slut".

While Sam's desires run wild, Pascal is not one to be outdone. He indulges in his own escapades, exploring the pleasures of numerous enticing women, leaving no room for marital fidelity.