A brother returns home to find his sister, a conservative college student, unknowingly seductive in her sleepwear. Her lithe body and innocent demeanor stir desires he's long suppressed. In a heated moment, he takes charge, pinning her down, his hands exploring her curves while she moans softly, awakening to his touch. Their bodies entwine, her tightness enveloping him as they fuck frantically, his sister transforming from prim and proper to a wild, insatiable vixen.