My stepsister masturbates in a diaper and cums with a vibrator

In this twisted tale of taboo, our protagonist discovers his stepsister's hidden fetish. She's been masturbating in her diaper, leaving telltale stains on the couch. Determined to uncover more about her perverse behavior, he stealthily follows her to her room one night. There, he catches her red-handed, pleasuring herself with a vibrator while wearing a soiled diaper. His curiosity turns into desire as he joins her in this deviant act. They both become lost in their animalistic urges, moaning and grinding against each other. The air is thick with sexual tension as they bring each other to climax. With one final thrust of the vibrator against her clit, she lets out a primal scream, her body shaking with orgasmic bliss. Her juices soak through the diaper, leaving a telltale stain of pleasure.