A tantalizingly sexy stranger on the bus thinks they're discreet, but they've caught the eye of a fellow passenger. Through the reflection in the window, you watch as they subtly slip a hand beneath their skirt, fingers dancing over their panties, their body tensing with each stroke. The bus's motion rocks them, adding an unintentional rhythm to their self-pleasure. As they near their stop, they quicken their pace, their breath hitching, a soft moan barely audible over the hum of the engine.