Rosalyn has a rare disorder that causes her to have uncontrollable orgasms. Living with her stepbrother is a challenge, since each time Rosalyn cums in front of him, he gets aroused. His dad sees his son looking at his stepsister with bedroom eyes and scolds him. But once Dick dozes off, his son sneaks back to Rosalyn to find the gratification both these young set-siblings crave.

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