Can't quite make it

You try to jump out of the doors, but they snap shut before you can get to them, locking you inside the car, **** to watch the girl touch herself as the train pulls away. You stick glued to the window until she is completely out of sight, then sigh, and turn away.

You're still drunk, and want to make the best of the evening, and have an unsatisfied urge to jack off in front of someone. The car you're in is empty, so you decide to move on to a new one. You distractly rub yourself through your pants as you try to decide which way to go.