In the dimly lit metro carriage, Lacey's thoughts wander to taboo places. She discreetly rubs her thighs together, feeling the dampness between her legs. The train's rhythmic motion and the distant hum of the tracks fuel her fantasy. She dares to slip a hand under her skirt, fingers finding their way to her wet slit. Her breath hitches as she strokes herself, her other hand squeezing her breast, until the screeching halt of the train snaps her back to reality.