The metro's rumble vibrates through the black beauty's core as she, sandwiched between two strangers, feels their hardness press against her. Her breath hitches as she grinds against them, their hands roaming, igniting sparks. They find a secluded corner, their bodies melding in a tangle of limbs and sweaty skin. She sucks one, her head bobbing, as the other enters her from behind, his hands gripping her hips. The metro's air conditioning does little to cool their heated bodies, as they switch places, their moans drowned by the metro's hum, until they all find release, panting and spent.