Casey finds herself unable to resist her stepsister, Shyla's advances in the aftermath of their steamy one night stand. Vulnerable and disappointed after losing out on a coveted modeling contract, Ryan seeks comfort in the arms of her seductive stepsister. Karla's burning desire for her stepsister, Scarlet explodes when she realizes that their feelings for one another are mutual. After discovering her stepsister's deviant side, Sabrina realizes that when it comes to sex, she might not know everything.