The Voyeur by Ellis O. Day

When Patrick stumbles across a cute maid watching a couple have sex at La Petite Mort Club, he can’t believe his luck.
She’s sexy, curvy, and kinky. Just his type of lady…until he discovers that she’s his best friend’s little sister which puts her firmly in the “hands-off” department.
Sparks fly and passions explode when Patrick is put in charge of the Club and ordered to keep Annie out of trouble.