Sibling Seduction: Caught in the Act

The nerdy stepsister, always the good girl, finds herself in a heated moment with her stepbrother. Their parents out, she's visiting his room to study, but her eyes keep wandering to his crotch. She can't help but imagine what it would be like to have him inside her. As they're discussing chemistry, she brings up a daring topic, "Have you ever thought about fucking me?" His eyes widen, but he nods. She stands up, pushing her books off his desk, and straddles him, grinding her pussy against his growing bulge. They're lost in their passion, but a creaking floorboard reminds them they're not alone. They quickly separate, just as their mom enters, giving them a puzzled look.

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