The metro's rhythmic rumble sets the pace as a sultry stranger begins her descent, her mouth engulfing the surprised commuter's now throbbing member. Her tongue swirls around the tip, tasting the pre-cum beading there, before she takes him deep, her throat muscles squeezing him tightly. The commuter's grip tightens on the metal pole, his knuckles white, as he struggles to maintain his composure. The woman's head bobs up and down, her mouth creating a wet, sucking sound that threatens to give them away, yet only serves to heighten their excitement. As the metro pulls into the next station, she surfaces, her lips glistening, a wicked grin playing on her face, leaving the commuter breathless and yearning for more.