In their shared bedroom, a curious sister spies her brother stroking his firm cock under the covers. Intrigued, she watches, her pussy dampening as he picks up the pace, his breath quickening. Sensing her presence, he looks up, embarrassed yet excited. She smiles, revealing she wants to join. He hesitates, then relents, and she climbs onto his bed, her nightgown dropping to the floor as she takes over, her small hand wrapping around his thick shaft, jerking him off with enthusiasm.