Generate a short erotic novel with the following plot Husband is Andrew Wife is Lisa Lisa’s best friend is Chelsea Overview: Andrew has sex with Chelsea while Lisa watches Lisa has her left hand handcuffed to her left ankle. Her right hand is handcuffed to her left ankle. Lisa also has a gag on and a collar around her neck that is attached to the doorknob. Lisa is on her knees on the floor with only a pillow between her legs to pleasure herself with and it is soaking wet from watching and grinding on. She watches as Andrew performs cunnilingus on Chelsea

Chapter 3: Building Tension

Andrew slides his fingers along Lisa's trembling thighs, tracing an electrifying path that sends shivers tingling down her spine. Lisa's body strains against the cold metal cuffs, but it only adds to the allure of the chain linking her to the polished wooden table. Her breath hitches, eyes fluttering behind the soft woolen blindfold as Andrew's lips ghost over her throbbing inner thighs.

A gentle whimper slips past her gag, and she parts her legs wider to welcome his touch.

Above her, Andrew hums a happily-strung chuckle that makes her want to giggle, though her gag muffles the sound. In the corner of her dimlit world, she can hear the swish of Chelsea's clothes hitting the cold marble floor. She feels an electric current of excitement race through her, knowing that her friend is undressing for Andrew in perfect synchronicity with every deliberate touch he teases her with.