This simple scene of sibling rivalry is lifted up by the acting of August Ames, who died before it was released.
She and Katrina Jade are step-sisters, with effective casting of the brunettes who have a type resemblance except for Jade's trademark tattooing. Kat shows August a video on her phone of August having sex with their dad, using it for sexual blackmail to have August make love to her.
Role-playing is a significant element here, since in addition to the sister/sister and daddy/daughter content we have Ames asking sis: "Can I call you daddy?".